Science & Technology PYQs (2013-2025)

2024

Q. Which one of the following words/phrases is most appropriately used to denote “an interoperable network of 3D virtual worlds that can be accessed simultaneously by millions of users, who can exert property rights over virtual items.”?

(a) Big data analytics

(b) Cryptography

(d) Virtual matrix

Q. With reference to radioisotope thermoelectric generators (RTGs), consider the following statements:

RTGs are miniature fission reactors
RTGs are used for powering the onboard systems of spacecrafts.
RTGs can use Plutonium-238, which is a by-product of weapons development.

Which of the statements given above are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Q. Consider the following statements:

Statement-I: Giant stars live much longer than dwarf stars.

Statement-II: Compared to dwarf stars, giant stars have a greater rate of nuclear reactions.

Which one of the following is correct in respect of the above statements?

(a) Both Statement-I and Statement-II are correct and Statement-II explains Statement-I

(b) Both Statement-I and Statement-II are correct but and Statement-II does not explains Statement-I

(d) Statement-I is incorrect, but Statement-II is correct

Q. Which one of the following is synthesised in human body that dilates blood vessels and increase blood flow?

(a) Nitric oxide

(b) Nitrous oxide

(d) Nitrogen pentoxide

Q. Consider the following activities:

Identification of narcotics on passengers at airports or in aircraft
Monitoring of precipitation
Tracking the migration of animals

In how many of the above activities can the radars be used?

(a) Only one
(b) Only two
(c) All three
(d) None

Q. Consider the following aircraft:

Rafael
MiG-29
Tejas MK-1

How many of the above are considered fifth generation fighter aircraft?

(a) Only one
(b) Only two
(c) All three
(d) None

Q. In which of the following are hydrogels used?

Controlled drug delivery in patients
Mobile air-conditioning systems
Preparation of industrial lubricants.

Select the correct answer using the code given below:

(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) 1, 2 and 3

Q. Which one of the following is the exhaust pipe emission from Fuel Cell Electric Vehicles, powered by hydrogen?

(a) Hydrogen peroxide

(b) Hydronium

(d) Water vapour

Q. “Membrane Bioreactors” are often discussed in the context of

(a) Assisted reproductive technologies

(b) Drug delivery nanotechnologies

(d) Wastewater treatment technologies

2023

Q. Consider the following statements

Carbon fibres are used in the manufacture of components used in automobiles and aircrafts.
Carbon fibres once used cannot be recycled.

Which of the statements given above is fare correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Q. Consider the following actions :

Detection of car crash/ collision which results in the deployment of airbags almost instantaneously
Detection of accidental free fall of a laptop towards the ground which results in the immediate turning off of the hard drive
Detection of the tilt of the smartphone which results in the rotation of display between portrait and landscape mode

In how many of the above actions is the function of accelerometer required?

(a) Only one
(b) Only two
(c) All three
(d) None

Q. Consider the following pairs :

Objects in space : Description

Cepheids Giant clouds of dust and gas in space
Nebulae Stars which brighten and dim periodically
Pulsars Neutron stars that are formed when massive stars run out of fuel and collapse

How many of the above pairs are correctly matched?

(a) Only one
(b) Only two
(c) All three
(d) None

Q. Which one of the following countries has its own Satellite Navigation System?

(a) Australia
(b) Canada
(c) Israel
(d) Japan

Q. Consider the following statements :

Ballistic missiles are jet-propelled at subsonic speeds throughout their flights, while cruise missiles are rocket powered only in the initial phase of flight.
Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Q. ‘Wolbachia method’ is sometimes talked about with reference to which one of the following?

(a) Controlling the viral diseases spread by mosquitoes
(b) Converting crop residues into packing materia
(c) Producing biodegradable plastics
(d) Producing biochar from. thennochemiceil conversion of biomass

Q. Aerial metagenomics’ best refers to which one of the following situations?

(a) Collecting DNA samples from air in a habitat at one go
(b) Understanding the genetic makeup of avian spedes of a habitat
(c) Using air-borne devices collect blood samples from moving animals
(d) Sending drones to inaccessible areas to collect plant and animal samples from land surfaces and water bodies

Q. ‘Microsatellite DNA’ is used in the case of which one of the following?

(a) Studying the evolutionary relationships among various species of fauna
(b) Stimulating ‘stem cells’ to transform into diverse functional tissues
(c) Promoting clonal propagation of horticultural plants
(d) Assessing the efficacy of drugs by conducting series of drug trials in a population

Q. With reference to green hydrogen, consider the following statements :

It can be used directly as a fuel for internal combustion.
It can be blended with natural gas and used as fuel for heat or power generation.
It can be used in the hydrogen full cell to run vehicles.

How many of the above statements are correct?

(a) Only one
(b) Only two
(c) All three
(d) None

Q. Consider the following :

Aerosols
Foam agents
Fire retardants
Lubricants

In the making of how many of the above are hydrofluorocarbons used?

(a) Only one
(b) Only two
(c) Only three
(d) All four

Answer: (d) All four

2022

1. Consider the following:

Aarogya Setu
COWIN
DigiLocker
DIKSHA

Which of the above are built on top of open-source digital platforms?

(a) 1 and 2 only
(b) 2, 3 and 4 only
(c) 1, 3 and 4 only
(d) 1, 2, 3 and 4

2. With reference to Web 3.0, consider the following statements:

Web 3.0 technology enables people to control their own data.
In Web 3.0 world, there can be blockchain based social networks.
Web 3.0 is operated by users collectively rather than a corporation

Which of the following given above are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

3. With reference to “Software as a Service (SaaS)”, consider the following statements:

SaaS buyers can customise the user interface and can change data fields.
SaaS users can access their data through their mobile devices.
Outlook, Hotmail and Yahoo! Mail are forms of SaaS.

Which of the statements given above are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

4. Which one of the following statements best reflects the idea behind the “Fractional Orbital Bombardment System” often talked about in media?

(a) A hypersonic missile is launched into space to counter the asteroid approaching the Earth and explode it in space.

(b) A spacecraft lands on another planet after making several orbital motions.

(d) A spacecraft moves along a comet with the same surface. speed and places a probe on its

5. Which one of the following is the context in which the term “qubit” is mentioned?

(a) Cloud Services

(b) Quantum Computing

(d) Wireless Communication Technologies

6. Consider the following communication technologies:

Closed-circuit Television
Radio Frequency Identification
Wireless Local Area Network

Which of the above are considered of the Short-Range devices/technologies?

(a) 1 and 2 only.
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

7. Consider the following statements:

Biofilms can form on medical implants within human tissues.
Biofilms can form on food and food processing surfaces.
Biofilms can exhibit antibiotic resistance.

Which of the statements given above are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

8. Consider the following statements in respect of probiotics :

Probiotics are made of both bacteria and yeast.
The organisms in probiotics are found in foods we ingest but they do not naturally occur in our gut.
Probiotics help in the digestion of milk sugars.

Which of the statements given above is/are correct?

(a) 1 only
(b) 2 only
(c) 1 and 3
(d) 2 and 3

9. In the context of vaccines manufactured to prevent COVID-19 pandemic, consider the following statements:

The Serum Institute of India produced COVID-19 vaccine named Covishield using mRNA platform.
Sputnik V vaccine is manufactured using vector based platform.
COVAXIN is an inactivated pathogen based vaccine.

Which of the statements given above are correct?

(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

10. If a major solar storm (solar flare) reaches the Earth, which of the following are the possible effects on the Earth?

GPS and navigation systems could fail.
Tsunamis could occur at equatorial regions.
Power grids could be damaged.
Intense auroras could occur over much of the Earth.
Forest fires could take place over much of the planet.
Orbits of the satellites could be disturbed.
Shortwave radio communication of the aircraft flying over polar regions could be interrupted.

Select the correct answer using the code given below:

(a) 1, 2, 4 and 5 only
(b) 2, 3, 5, 6 and 7 only
(c) 1, 3, 4, 6 and 7 only
(d) 1, 2, 3, 4, 5, 6 and 7

11. Which one of the following statements best describes the role of B cells and T cells in the human body?

(a) They protect the environmental allergens. body

(b) They alleviate the body’s pain and inflammation.

(d) They protect the body from the diseases caused by pathogens.

12. Consider the following statements:

Other than those made by humans, nanoparticles do not exist in nature.
Nanoparticles of some metallic oxides are used in the manufacture of some cosmetics.
Nanoparticles of some commercial products which enter the environment are unsafe for humans.

Which of the statements given above is/are correct?

(a) 1 only
(b) 3 only
(c) 1 and 2
(d) 2 and 3

13. Consider the following statements: DNA Barcoding can be a tool to:

assess the age of a plant or animal.
distinguish among species that look alike.
identify undesirable animal or plant materials in processed foods.

Which of the statements given above is/are correct?

(a) 1 only
(b) 3 only
(c) 1 and 2
(d) 2 and 3

2021

1. Water can dissolve more substances than any other liquid because.

(a) It is dipolar in nature.
(b) It is a good conductor of heat
(c) It has high value of specific heat
(d) It is an oxide of hydrogen

2. With reference to street lighting, how do sodium lamps differ from LED lamps?

1. Sodium lamps produce light at 360 degrees but it is not so in the case of LED lamps.
2. As street lights, sodium lamps have a longer life span than LED lamps.
3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting.
Select the correct answer using the code given below.
(a) 3 only
(b) 2 only
(c) 1 and 3 only
(d) 1, 2 and 3

3. The term “ACE2” is talked about in the context of

(a) genes introduced in the genetically modified plants
(b) development of India’s own satellite navigation system
(c) radio collars for wildlife tracking
(d) spread of viral diseases

4. Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?

(a) Low-density polyethylene
(b) Polycarbonate
(c) Polyethylene terephthalate
(d) Polyvinyl Chloride

5. “Triclosan” considered harmful when exposed to high levels for a long time, is most likely present in which of the following?

(a) Food preservatives
(b) Fruit ripening substances
(c) reused plastic containers
(d) Toiletries

6. Which one of the following is a reason why astronomical distances are measured in light-years?

(a) Distance among stellar bodies do not change
(b) Gravity of stellar bodies does not change
(c) Light always travels in straight line
(d) Speed of light is always same

7. With reference to recent developments regarding ‘Recombinant vector Vaccines’, consider the following statements:

1. Genetic engineering is applied in the development of these vaccines.
2. Bacteria and viruses are used as vectors.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

8. In the context of hereditary diseases, consider the following statements:

1. Passing on mitochondrial diseases from parent to child can be prevented by mitochondrial replacement therapy either before or after in vitro fertilization of the egg.
2. A child inherits mitochondrial diseases entirely from the mother and not from the father.
Which of the statements given above is’/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

9. Bollgard I and Bollgard II technologies are mentioned in the context of

(a) Clonal propagation of crop plants
(b) Developing genetically modified crop plants
(c) Production of plant growth substances
(d) Production of biofertilizers

10. In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?

1. Area of the hole in the lid
2. Temperature of the flame
3. Weight of the lid
Select the correct answer using the code given below.
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1,2 and 3

11. Consider the following:

1. Bacteria
2. Fungi
3. Virus
Which of the above can be cultured in an artificial/ synthetic medium?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1,2 and 3

12. Consider the following statements:

1. Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes.
2. Common cold is sometimes caused by an adenovirus whereas AIDS is caused by a retrovirus.
Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

13. Which one of the following is used in preparing a natural mosquito repellent?

a) Congress grass
b) Elephant grass
c) Lemon grass
d) Nut grass

2020

1. With reference to carbon nanotubes, consider the following statements:

They can be used as carriers of drugs and antigens in the human body.
They can be made into artificial blood capillaries for an injured part of the human body.
They can be used in biochemical sensors.
Carbon nanotubes are biodegradable.

Which of the statements given above are correct?

(a) 1 and 2 only

(b) 2, 3 and 4 only

(d) 1, 2, 3 and 4

2. Consider the following activities:

Spraying pesticides on a crop field
Inspecting the craters of active volcanoes
Collecting breath samples from spouting whales for DNA analysis

At the present level of technology, which of the above activities can be successfully carried out by using drones?

(a) 1 and 2 only

(b) 2 and 3 only

(d) 1, 2 and 3

3. “The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining between the craft.” The experiment in question refers to

(a) Voyager-2

(b) New horizons

(d) Evolved LISA

4. Consider the following statements:

Genetic changes can be introduced in the cells that produce eggs or sperms of a prospective parent.
A person’s genome can be edited before birth at the early embryonic stage.
Human induced pluripotent stem cells can be injected into the embryo of a pig.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

5. What is the importance of using Pneumococcal Conjugate Vaccines in India?

These vaccines are effective against pneumonia as well as meningitis and sepsis.
Dependence on antibiotics that are not effective against drug-resistant bacteria can be reduced.
These vaccines have no side effects and cause no allergic reactions.

Select the correct answer using the code given below:

(a) 1 only

(b) 1 and 2 only

(d) 1, 2 and 3

6. In India, the term “Public Key Infrastructure” is used in the context of

(a) Digital security infrastructure

(b) Food security infrastructure

(d) Telecommunication and transportation infrastructure

7. Which of the following statements are correct regarding the general difference between plant and animal cells?

Plant cells have cellulose cell walls whilst animal cells do not.
Plant cells do not have plasma membranes unlike animal cells which do.
Mature plant cell has one large vacuole whilst an animal cell has many small vacuoles.

Select the correct answer using the code given below:

(a) 1 and 2 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

8. In the context of recent advances of human reproductive technology, “Pronuclear Transfer” is used for

(a) fertilization of egg in vitro by the donor sperm

(b) genetic modification of sperm producing cells

(d) prevention of mitochondrial diseases in offspring

9. With the present state of development, Artificial Intelligence can effectively do which of the following?

Bring down electricity consumption in industrial units
Create meaningful short stories and songs
Disease diagnosis
Text-to-Speech Conversion
Wireless transmission of electrical energy

Select the correct answer using the code given below:

(a) 1, 2, 3 and 5 only

(b) 1, 3 and 4 only

(d) 1, 2, 3, 4 and 5

10. With reference to Visible Light Communication (VLC) technology, which of the following statements are correct?

VLC uses electromagnetic spectrum wavelengths 375 to 780 nm.
VLC is known as long-range optical wireless communication.
VLC can transmit large amounts of data faster than Bluetooth.
VLC has no electromagnetic interference.

Select the correct answer using the code given below:

(a) 1, 2 and 3 only

(b) 1, 2 and 4 only

(c) 1, 3 and 4 only

(d) 2, 3 and 4 only

11. With reference to “Blockchain Technology”, consider the following statements:

It is a public ledger that everyone can inspect, but which no single user controls.
The structure and design of blockchain is such that all the data in it are about cryptocurrency only.
Applications that depend on basic features of blockchain can be developed without anybody’s permission.

Which of the statements given above is/are correct?

(a) 1 only

(b) 1 and 2 only

(d) 1 and 3 only

12. With reference to solar water pumps, consider the following statements:

Solar power can be used for running surface pumps and not for submersible pumps.
Solar power can be used for running centrifugal pumps and not the ones with piston.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 only

(d) Neither 1 nor 2

13. In India, why are some nuclear reactors kept under “IAEA safeguards” while others are not?

(a) Some use uranium and others use thorium

(b) Some use imported uranium and others use domestic supplies

(d) Some are State-owned and others are privately-owned

2019

1. Atal Innovation Mission is set up under the

(a) Department of Science and Technology

(b) Ministry of Labour and Employment

(c) NITI Aayog

(d) Ministry of Skill Development and Entrepreneurship

2. For the measurement/estimation of which of the following are satellite images/remote sensing data used?

Chlorophyll content in the vegetation of a specific location
Greenhouse gas emissions from rice paddies of a specific location
Land surface temperatures of a specific location

Select the correct answer using the code given below.

(a) 1 Only

(b) 2 and 3 only

(d) 1, 2 and 3

3. With reference to communication technologies, what is/are the difference/differences between LTE (Long-Term Evolution) and VoLTE (Voice over Long-Term Evolution)?

LTE is commonly marketed as 3G and VoLTE is commonly marketed as advanced 3G.
LTE is data-only technology and VoLTE is voice-only technology.

Select the correct answer using the code given below.

(a) 1 only

(b) 2 only

(d) Neither 1 nor 2

4. In the context of digital technologies for entertainment, consider the following statements:

In Augmented Reality (AR), a simulated environment is created and the physical world is completely shut out.
In Virtual Reality (VR), images generated from a computer are projected onto real-life objects or surroundings.
AR allows individuals to be present in the world and improves the experience using the camera of smart-phone or PC.
VR closes the world, and transposes an individual, providing complete immersion experience.

Which of the statements given above is/are correct?

(a) 1 and 2 only

(b) 3 and 4

(d) 4 only

5. With reference to the recent developments in science, which one of the following statements is not correct?

(a) Functional chromosomes can be created by joining segments of DNA taken from cells of different species.

(b) Pieces of artificial functional DNA can be created in laboratories.

6. Consider the following statements:

A digital signature is

an electronic record that identifies the certifying authority issuing it
used to serve as a proof of identity of an individual to access information or server on Internet
an electronic method of signing an electronic document and ensuring that the original content is unchanged

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(c) 3 only

(d) 1, 2 and 3

7. In the context of wearable technology, which of the following tasks is/are accomplished by wearable devices?

Location identification of a person
Sleep monitoring of a person
Assisting the hearing impaired person

Select the correct answer using the code given below:

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

8. ‘RNA interference (RNAi)’ technology has gained popularity in the last few years. Why?

It is used in developing gene silencing therapies.
It can be used in developing therapies for the treatment of cancer.
It can be used to develop hormone replacement therapies.
It can be used to produce crop plants that are resistant to viral pathogens.

Select the correct answer using the code given below.

(a) 1, 2 and 4

(b) 2 and 3

9. Recently, Scientists observed the merger of giant blackholes’ billions of light-years away from the Earth. What is the significance of this observation?

(a) ‘Higgs boson particles’ were detected.

(b) ‘Gravitational waves’ were detected.

(d) It enabled the scientists to understand ‘singularity’.

10. Which of the following are the reasons for the occurrence of multi-drug resistance in microbial pathogens in India?

Genetic predisposition of some people
Taking incorrect doses of antibiotics to cure diseases
Using antibiotics in livestock farming
Multiple chronic diseases in some people

Select the correct answer using the code given below.

(a) 1 and 2

(b) 2 and 3 only

(d) 2, 3 and 4

11. What is Cas9 protein that is often mentioned in news?

(a) A molecular scissors used in targeted gene editing

(b) A biosensor used in the accurate detection of pathogens in patients

(d) A herbicidal substance synthesized in genetically modified crops

12. Which one of the following statements is not correct?

(a) Hepatitis B virus is transmitted much like HIV.

(b) Hepatitis B. unlike Hepatitis C, does not have a vaccine.

(c) Globally, the number of people infected with Hepatitis B and C viruses arc several times more than those infected with HIV.

(d) Some of those infected with Hepatitis B and C viruses do not show the symptoms for many years.

2018

1. Consider the following pairs:

Commonly used/consumed materials Unwanted or controversial chemicals likely to be
found in them

Lipstick — Lead
Soft Drinks — Brominated vegetable oils
Chinese fast food — Monosodium glutamate

Which of the pairs given above is/are correctly matched?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

2. With reference to India’s satellite launch vehicles, consider the following statements:

PSLVs launch the satellites useful for Earth resources monitoring whereas GSLVs are designed mainly to launch communication satellites.
Satellites launched by PSLV appear to remain permanently fixed in the same position in the sky, as viewed from a particular location on Earth.
GSLV Mk III is a four-staged launch vehicle with the first and third stages using solid rocket motors; and the second and fourth stages using liquid rocket engines.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 and 3

(d) 3 only

3. Consider the following:

Birds
Dust blowing
Rain
Wind blowing

Which of the above spread plant diseases?

(a) 1 and 3 only

(b) 3 and 4 only

(d) 1, 2, 3 and 4

4. What is “Terminal High Altitude Area Defense (THAAD)”, sometimes seen in the news?

(a) An Israeli radar system

(b) India’s indigenous anti-missile programme

(c) An American anti-missile system

(d) A defence collaboration between Japan and South Korea.

5. “3D printing” has applications in which of the following?

Preparation of confectionery items
Manufacture of bionic ears
Automotive industry
Reconstructive surgeries
Data processing technologies

Select the correct answer using the code given below.

(a) 1, 3 and 4 only

(b) 2, 3 and 5 only

(d) 1, 2, 3, 4 and 5

6. With reference to the Indian Regional Navigation Satellite System (IRNSS), consider the following statements:

IRNSS has three satellites in geostationary and four satellites in geosynchronous orbits.
IRNSS covers entire India and about 5500 sq. km beyond its borders.
India will have its own satellite navigation system with full global coverage by the middle of 2019.

Which of the statements given above is/are correct?

(a) 1 only

(b) 1 and 2 only

(d) None

7. Consider the following statements:

Light is affected by gravity.
The Universe is constantly expanding.
Matter warps its surrounding space-time.

Which of the above is/are the prediction/predictions of Albert Einstein’s General Theory of Relativity, often discussed in media?

(a) 1 and 2 only

(b) 3 only

(d) 1, 2 and 3

8. With reference to the Genetically Modified mustard (GM mustard) developed in India, consider the following statements:

GM mustard has the genes of a soil bacterium that give the plant the property of pest-resistance to a wide variety of pests.
GM mustard has the genes that allow the plant cross-pollination and hybridization.
GM mustard has been developed jointly by the IARI and Punjab Agricultural University.

Which of the statements given above is/are correct?

(a) 1 and 3 only

(b) 2 only

(d) 1, 2 and 3

9. Consider the following pairs:

Terms sometimes Context/Topic
seen in news

Belle II experiment — Artificial Intelligence
Blockchain technology — Digital/Cryptocurrency
CRISPR – Cas9 — Particle Physics

Which of the pairs given above is/are correctly matched?

(a) 1 and 3 only

(b) 2 only

(d) 1, 2 and 3

10. When the alarm of your smartphone rings in the morning, you wake up and tap it to stop the alarm which causes your geyser to be switched on automatically. The smart mirror in your bathroom shows the day’s weather and also indicates the level of water in your overhead tank. After you take some groceries from your refrigerator for making breakfast, it recognises the shortage of stock in it and places an order for the supply of fresh grocery items. When you step out of your house and lock the door, all lights, fans, geysers and AC machines get switched off automatically. On your way to office, your car warns you about traffic congestion ahead and suggests an alternative route, and if you are late for a meeting, it sends a message to your office accordingly.

In the context of emerging communication technologies, which one of the following terms best applies to the above scenario?

(a) Border Gateway Protocol

(b) Internet of Things

(d) Virtual Private Network

11. In which of the following areas can GPS technology be used?

Mobile phone operations
Banking operations
Controlling the power grids

Select the correct answer using the code given below:

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

12. The terms ‘WannaCry, Petya and Eternal Blue’ sometimes mentioned in the news recently are related to

(a) Exoplanets

(b) Cryptocurrency

(c) Cyber attacks

(d) Mini satellites

13. The identity platform ‘Aadhaar’ provides open “Application Programming Interfaces (APIs)”. What does it imply?

It can be integrated into any electronic device.
Online authentication using iris is possible.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

14. India enacted the Geographical Indications of Goods (Registration and Protection) Act, 1999 in order to comply with the obligations to

(a) ILO

(b) IMF

(d) WTO

15. What is/are the consequence/consequences of a country becoming the member of the ‘Nuclear Suppliers Group’?

It will have access to the latest and most efficient nuclear technologies.
It automatically becomes a member of “The Treaty on the Non-Proliferation of Nuclear Weapons (NPT)”.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 only

(d) Neither 1 nor 2

2017

1. Consider the following statements:

In tropical regions, Zika virus disease is transmitted by ‘the same mosquito that transmits dengue.
Sexual transmission of Zika virus disease is possible

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

2. What is the purpose of ‘evolved Laser Interferometer Space Antenna’ (eLISA) project?

(a) To detect neutrinos

(b) To detect gravitational waves

(d) To study the effect of solar flares on our communication systems

3. What is the application of Somatic Cell Nuclear Transfer Technology?

(a) Production of biolarvicides

(b) Manufacture of biodegradable plastics

(c) Reproductive cloning of animals

(d) Production of organisms free of diseases

4. With reference to agriculture in India, how can the technique of ‘genome sequencing’, often seen in the news, be used in the immediate future?

Genome sequencing can be used to identify genetic markers for disease resistance and drought tolerance in various crop plants.
This technique helps in reducing the time required to develop new varieties of crop plants.
It can be used to decipher the host-pathogen relationships in crops

Select the correct answer using the code given below:

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

5. In India, it is legally mandatory for which of the following to report on cyber security incidents?

Service providers
Data centers
Body corporate

Select the correct answer using the codes given below:

(a) 1 only

(b) 1 and 2 only

(d) 1, 2 and 3

6. Organic Light Emitting Diodes (OLEDs) are used to create digital display in many devices. What are the advantages of OLED displays over Liquid Crystal displays?

OLED displays can be fabricated on flexible plastic substrates.
Roll-up displays embedded in clothing can be made using OLEDs.
Transparent displays are possible using OLEDs.

Select the correct answer using the codes given below:

(a) 1 and 3 only

(b) 2 only

(c) 1, 2 and 3

(d) None of the above statement is correct

2016

1. ‘Project Loon’, sometimes seen in the news, is related to

(a) waste management technology

(b) wireless communication technology

(d) water conservation technology

2. Which of the following statements is/are correct?

Viruses can infect

bacteria
fungi
plants

Select the correct answer using the code given below:

(a) 1 and 2 only

(b) 3 only

(d) 1, 2 and 3

3. Consider the following statements:

The Mangalyaan launched by ISRO

is also called the Mars Orbiter Mission
made India the second country to have a spacecraft orbit the Mars after USA
made India the only country to be successful in making its spacecraft orbit the Mars in its very first attempt

Which of the statement(s) given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

4. With reference to ‘Astrosat’, the astronomical observatory launched by India, which of the following statement(s) is/are correct?

Other than USA and Russia, India is the only country to have launched a similar observatory into space.
Astrosat is a 2000 kg satellite placed in an orbit at 1650 km above the surface of the Earth.

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 only

(d) Neither 1 nor 2

5. Which one of the following is the best description of ‘INS Astradharini’, that was in the news recently?

(a) Amphibious warfare ship

(b) Nuclear-powered submarine

(c) Torpedo launch and recovery vessel

(d) Nuclear-powered aircraft carrier

6. India is an important member of the ‘International Thermonuclear Experimental Reactor’. If this experiment succeeds, what is the immediate advantage of India?

(a) It can use thorium in place of uranium for power generation.

(b) It can attain a global role in satellite navigation

(d) It can build fusion reactors for power generation

7. In the context of the developments in Bioinformatics, the term ‘transcriptome’, sometimes seen in the news, refers to

(a) a range of enzymes used in genome editing

(b) the full range of mRNA molecules expressed by an organism

(d) a mechanism of genetic mutation taking place in cells

8. With reference to pre-packed items in India, it is mandatory to the manufacturer to put which of the following information on the main label, as per the Food Safety and Standards (Packaging and Labelling) Regulation, 2011?

List of ingredients including additives
Nutrition information
Recommendations, if any, made by the medical profession about the possibility of any allergic reaction
Vegetarian/non-vegetarian

Select the correct answer using the codes given below:

(a) 1, 2 and 3 only

(b) 2, 3 and 4 only

(c) 1, 2 and 4 only

(d) 1 and 4 only

9. With reference to ‘LiFi’, recently in the news, which of the following statement(s) is/are correct?

It uses light as the medium for high speed data transmission.
It is a wireless technology and several times faster than ‘WiFi’.

Select the correct answer using the code given below.

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

10. With reference to ‘Bitcoins’, sometimes seen in the news, which of the following statement(s) is/are correct?

Bitcoins are tracked by the Central Banks of the countries.
Anyone with a Bitcoin address can send and receive Bitcoins from anyone else with a Bitcoin address.
Online payments can be sent without either side knowing the identity of the other.

Select the correct answer using the codes given below.

(a) 1 and 2 only

(b) 2 and 3 only

(d) 1, 2 and 3

11. What is ‘Greased Lightning-10 (GL-10)’, recently in the news?

(a) Electric plane tested by NASA

(b) Solar-powered two-seater aircraft designed by Japan

(d) Reusable rocket designed by ISRO

12. What is Medecins Sans Frontiers (MSF)?

(a) An agency formed by the International Olympic Committee (IOC) to check misuse of drugs by sportspersons

(b) A non-governmental organization which specializes in international humanitarian aid and emergency medical assistance

(d) An organization of medical practitioners funded by the European Union which carries out reach against spread of AIDS

2015

1. With reference to ‘fly ash’ produced by the power plants using coal as fuel, which of the following statements is/are correct?

Fly ash can be used in the production of bricks for building construction.
Fly ash can be used as a replacement for some of the Portland cement contents of concrete.
Fly ash is made up of silicon dioxide and calcium oxide only, and does not contain any toxic elements.

Select the correct answer using the code given below.

(a) 1 and 2

(b) 2 only

(d) 3 only

2. In the context of modern scientific research, consider the following statements about ‘lceCube’, a particle detector located at South Pole, which was recently in the news:

It is the world’s largest neutrino detector, encompassing a cubic kilometre of ice.
It is a powerful telescope to search for dark matter.
It is buries deep in the ice.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

3. The term ‘Goldilocks Zone’ is often seen news in the context of

(a) the limits of habitable zone above the surface of the Earth

(b) regions inside the Earth where shale gas is available

(c) search for the Earth-like planets in outer space

(d) search for meteorites containing precious metals

4. With reference to ‘fuel cells’ in which hydrogen-rich fuel and oxygen are used to generate electricity, consider the following statements:

If pure hydrogen is used as a fuel, the fuel cell emits heat and water as by-products.
Fuel cells can be used for powering buildings and not for small devices like laptop computers.
Fuel cells produce electricity in the form of Alternating Current (AC).

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

5. In which of the following activities are Indian Remote Sensing (IRS) satellites used?

Assessment of crop productivity
Locating groundwater resources
Mineral exploration
Telecommunications
Traffic studies

Select the correct answer using the codes given below.

(a) 1, 2 and 3 only

(b) 4 and 5 only

(d) 1, 2, 3, 4 and 5

6. With reference to the use of Nano-technology in health sector, which of the following statement(s) is/are correct?

Targeted drug delivery is made possible by nanotechnology.
Nanotechnology can largely contribute to gene therapy.

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

7. H1N1 virus is sometimes mentioned in the news with reference to which one of the following diseases?

(a) AIDS

(b) Bird flu

(d) Swine flu

8. With reference to ‘Near Field Communication (NFC) Technology’, which of the following is/are correct?

It is a contactless communication technology that uses electromagnetic radio fields.
NFC is designed for use by devices which can be at a distance of even a metre from each other.
NFC can use encryption when sending sensitive information.

Select the correct answer using the codes given below.

(a) 1 and 2 only

(b) 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

2014

1. Which of the following are some important pollutants released by steel industry in India?

Oxides of sulphur
Oxides of nitrogen
Carbon monoxide
Carbon dioxide

Select the correct answer using the code given below

(a) 1, 3 and 4 only

(b) 2 and 3 only

(d) 1, 2, 3 and 4

2. Lichens, which are capable of initiating ecological succession even on a bare rock, are actually a symbiotic association of

(a) Algae and bacteria

(b) Algae and fungi

(d) Fungi and mosses

3. Which one of the following is the process involved in photosynthesis?

(a) Potential energy is released to form free energy

(b) Free energy is converted into potential energy and stored

(d) Oxygen is taken, and carbon dioxide and water vapour are given out.

4. Which of the following is/are the example/examples of chemical change?

Crystallization of sodium chloride
Melting of ice
Souring of milk

Select the correct answer using the code given below.

(a) 1 and 2 only

(b) 3 only

(d) None

5. Which of the following statements is/are correct regarding vegetative propagation of plants?

Vegetative propagation produces clonal population.
Vegetative propagation helps in eliminating the virus.
Vegetative propagation can be practiced most of the year.

Select the correct answer using the code given below.

(a) 1 only

(b) 2 and 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

6. Consider the following pairs:

Vitamin Deficiency disease

Vitamin C Scurvy
Vitamin D Rickets
Vitamin E Night blindness

Which of the pairs given above is/are correctly matched?

(a) 1 and 2 only

(b) 3 only

(d) None

7. Consider the following techniques/phenomena:

Budding and grafting in fruit plants
Cytoplasmic male sterility
Gene silencing

Which of the above is/are used to create transgenic crops?

(a) 1 only

(b) 2 and 3

(d) None

8. Among the following organisms, which one does not belong to the class of other three?

(a) Crab

(b) Mite

(d) Spider

9. Consider the following statements:

Maize can be used for the production of starch.
Oil extracted from maize can be a feedstock for biodiesel.
Alcoholic beverages can be produced by using maize.

Which of the statements given above is/are correct?

(a) 1 only.

(b) 1 and 2 only

(d) 1, 2 and 3

10. Consider the following diseases

Diphtheria
Chickenpox
Smallpox

Which of the above diseases has/have been eradicated in India?

(a) 1 and 2 only

(b) 3 only

(d) None

11. Consider the following:

Bats
Bears
Rodents

The phenomenon of hibernation can be observed in which of the above kinds of animals?

(a) 1 and 2 only

(b) 2 only

(c) 1, 2 and 3

(d) Hibernation cannot be observed in any of the above

12. Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth?

Volcanic action
Respiration
Photosynthesis
Decay of organic matter

Select the correct answer using the code given below.

(a) 1 and 3 only

(b) 2 only

(c) 1, 2 and 4 only

(d) 1, 2, 3 and 4

13. Which of the following pair(s) is/are correctly matched?

	Spacecraft		Purpose
1.	Cassini-Huygens	:	Orbiting the Venus and transmitting data to the Earth
2.	Messenger	:	Mapping and investigating the Mercury
3.	Voyager 1 & 2	:	Exploring the outer solar system

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

14. With reference to Agni-IV Missile, which of the following statement(s) is/are correct?

It is surface-to-surface missile.
It is fuelled by liquid propellant only.
It can deliver one tonne nuclear warhead about 7500 km away.

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

15. With reference to technologies for solar power production, consider the following statements:

‘Photovoltaics’ is a technology that generates electricity by direction conversion of light into electricity, while ‘Solar Thermal’ is a technology that utilizes the Sun’s rays to generate heat which is further used in electricity generation process.
Photovoltaics generate Alternating Current (AC), while solar Thermal generates Direct Current (DC).
India has manufacturing base for Solar Thermal technology, but not for Photovoltaics.

Which of the statement(s) given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(d) None

16. Brominated flame retardants are used in many household products like mattresses and upholstery. Why is there some concern about their use?

They are highly resistant to degradation in the environment.
They are able to accumulate in humans and animals.

Select the correct answer using the code given below.

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

17. There is some concern regarding the nanoparticles of some chemical elements that are used by the industry in the manufacture of various products. Why?

They can accumulate in the environment, and contaminate water and soil.
They can enter the food chains.
They can trigger the production of free radicals.

Select the correct answer using the codes given below:

(a) 1 and 2 only

(b) 3 only

(d) 1, 2 and 3

18. In India, cluster bean (Guar) is traditionally used as a vegetable or animal feed, but recently the cultivation of this has assumed significance. Which one of the following statements is correct in this context?

(a) The oil extracted from seeds is used in the manufacture of biodegradable plastics

(b) The gum made from its seeds is used in the extraction of shale gas

(d) It is a source of high quality biodiesel

19. With reference to two non-conventional energy sources called ‘coalbed methane’ and ‘shale gas’, consider the following statements:

Coalbed methane is the pure methane gas extracted from coal seams, while shale gas is a mixture of propane and butane only that can be extracted from fine-grained sedimentary rocks.
In India, abundant coalbed methane sources exist, but so far no shale gas sources have been found.

Which of the statement(s) given above is/are correct?

(a) 1 only

(b) 2 only

(d) Neither 1 nor 2

20. In addition to fingerprint scanning, which of the following can be used in the biometric identification of a person?

Iris scanning
Retinal scanning
Voice recognition

Select the correct answer using the code given below.

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

2013

1. Which of the following adds/add nitrogen to the soil?

Excretion of urea by animals
Burning of coal by man
Death of vegetation

Select the correct answer using the codes given below:

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

2. Consider the following animals:

Sea cow
Sea horse
Sea lion

Which of the above is/are mammal/mammals?

(a) 1 only

(b) 1 and 3 only

(d) 1, 2 and 3

3. Improper handling and storage of cereal grains and oilseeds result in the production of toxins known as aflatoxins which are not generally destroyed by normal cooking process. Aflatoxins are produced by

(a) Bacteria

(b) Protozoa

(d) Viruses

4. Which of the following diseases can be transmitted from one person to another through tattooing?

Chikungunya
Hepatitis B
HIV-AIDS

Select the correct answer using the codes given below:

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

5. Consider the following organisms:

Agaricus
Nostoc
Spirogyra

Which of the above is/are used as biofertilizer/biofertilizers?

(a) 1 and 2

(b) 2 only

(d) 3 only

6. Which of the following statements is/are correct

Viruses lack enzymes necessary for the generation of energy.
Viruses can be cultured in any synthetic medium.
Viruses are transmitted from one organism to another by biological vectors only.

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

7. Consider the following minerals:

Calcium
Iron
Sodium

Which of the minerals given above is/are required by human body for the contraction of muscles?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

8. Fruits stored in a cold chamber exhibit longer storage life because

(a) exposure to sunlight is prevented

(b) concentration of carbon dioxide in the environment is increased

(d) there is an increase in humidity

9. The known forces of nature can be divided into four classes, viz. gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?

(a) Gravity is the strongest of the four

(b) Electromagnetism acts only on particles with an electric charge

(d) Strong nuclear force holds protons and neutrons inside the nucleus of an atom

10. Consider the following phenomena:

Size of the sun at dusk
Colour of the sun at dawn
Moon being visible at dawn
Twinkle of stars in the sky
Polestar being visible in the sky

Which of the above are optical illusions?

(a) 1, 2 and 4 only

(b) 3, 4 and 5 only

(d) 2, 3 and 5 only

11. Due to improper/indiscriminate disposal of old and used computers or their parts, which of the following are released into the environment as e-waste?

Beryllium
Cadmium
Chromium
Heptachlor
Mercury
Lead
Plutonium

Select the correct answer using the codes given below:

(a) 1, 3, 4, 6 and 7 only

(b) 1, 2, 3, 5 and 6 only

(d) 1, 2, 3, 4, 5, 6 and 7

12. The efforts to detect the existence of Higgs boson particle have become frequent news in the recent past. What is/are the importance (s) of discovering this particle?

It will enable us to understand as to why elementary particles have mass.
It will enable us in the near future to develop the technology of tranferring matter from one point to another without traversing the physical space between them.
It will enable us to create better fuels for nuclear fission.

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

13. Many transplanted seedlings do not grow because

(a) the new soil does not contain favourable minerals

(b) most of the root hairs grip the new soil too hard

(d) leaves get damaged during transplantation

14. Recombinant DNA technology (Genetic Engineering) allows genes to be transferred

Across different species of plants
From animals to plants
From microorganisms to higher organisms

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

15. Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to

resist drought and increase absorptive area
tolerate extremes of pH
resist disease infestation

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

2012

1. Consider the following kinds of organisms:

Bat
Bee
Bird

Which of the above is/are pollinating agent/agents?

(a) 1 and 2 only

(b) 2 only

(d) 1, 2 and 3

2. Consider the following statements:

If there were no phenomenon of capillarity

It would be difficult to use a kerosene lamp
One would not be able to use a straw to consume a soft drink
The blotting paper would paper would fail to function
The big trees that we see around would not have grown on the earth

Which of the following statements given above are correct?

(a) 1, 2 and 3 only

(b) 1, 3 and 4 only

(d) 1, 2, 3 and 4

3. Graphene is frequently in news recently. What is its important?

It is a twodimensional material and has good electrical conductivity.
It is one of the thinnest but strongest materials tested so far.
It is entirely made of silicon and has high optical transparency.
It can be used as ‘conducting electrodes’ requires for touch screens, LCD’s and organic LED’s

Which of the statements given above are correct?

(a) 1 and 2 only

(b) 3 and 4 only

(d) 1, 2, 3 and 4

4. Which of the following is/are cited by the scientists as evidence/evidences for the continued expansion of universe?

Detection of microwaves in space
Observation of redshirt phenomenon in space
Movement of asteroids in space
Occurrence of supernova explosions in space code

(a) 1 and 2 only

(b) 2 only

(d) None of the above

5. Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the earth. What prevents them from reaching the surface of the earth?

(a) The Earth’s magnetic field diverts them toward its poles

(b) Ozone layer around the Earth reflects them back to outer space

(d) None of the statements (a),(b) and (c) is correct.

6. Lead, ingested or inhaled, is a health hazard. After the addition of lead to petrol has been banned, what still are the sources of lead poisoning?

Smelting units
Pens pencils
Paints
Hair oils and cosmetics

Select the correct answer using the codes given below:

(a) 1, 2 and 3 only

(b) 1 and 3 only

(d) 1, 2, 3 and 4

7. What is the role of ultraviolet (UV) radiation in the water purification systems?

It inactivates/kills the harmful microorganisms in water.
It removes all the undesirable odours from the water
It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

8. Other than resistance to pests, what are the prospects for which genetically engineered plants have been created?

(a) To enable them to withstand drought

(b) To increase the nutritive value of the produce

(d) To increase their shelf life

9. Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

(a) Hydrogen, Oxygen, Sodium

(b) Carbon, Hydrogen, Nitrogen

(d) Carbon, Hydrogen, Potassium

10. Consider the following kinds of organisms:

Bacteria
Fungi
Flowering plants

Some species of which of the above kinds of organisms are employed as bio pesticides?

(a) 1 only

(b) 2 and 3 only

(d ) 1, 2 and 3

11. A team of scientists at Brookhaven National Laboratory including those from India created the heaviest antimatter (antihelium nucleus) What is/are the implications of the creation of antimatter?

It will make mineral prospecting and oil exploration easier and cheaper.
It will help probe the possibility of the existence of stars and galaxies made of anti matter.
It will help understand the evolution of the universe.

Select the correct answer using the codes given below:

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

12. To meet its rapidly growing energy demand, some opine that India should pursue research and development on thorium as the future fuel of nuclear energy. In this context, what advantage does thorium hold over uranium?

Thorium is far more abundant in nature than uranium.
On the basis of unit mass of mined mineral, thorium can generate more energy compared to natural uranium
Thorium produces less harmful waster compared to uranium.

Which of the statement(s) given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

13. Recently, there has been a concern over the short supply of a group of elements called ‘rare earth metals’. Why?

China, which is the largest producer of these elements, has imposed some restrictions on their export.
Other than China, Australia, Canada and Chile, these elements are not found in any country.
Rare earth metals are essential for the manufacture of various kinds of electronic items and there is a growing demand for these elements.

Which of the statement(s) given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

14. With reference to ‘stem cells’, frequently in the news, which of the following statement(s) is/are correct?

Stem cells can be derived from mammals only.
Stem cells can be used for screenings new drugs.
Stem cells can be used for medical therapies.

Select the correct answer using the codes given below.

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

15. What are the reasons for the people’s resistance to the introduction of Bt brinjal in India?

Bt brinjal has been created by inserting a gene from a soil funguns into its genome.
The seeds of Bt brinjal are terminator seeds and therefore, the farmers have to buy the seeds before every season from the seed companies.
There is an apprehension that the consumption of Bt-brinjal may have adverse impact on health.
There is some concern that the introduction of Bt-brinjal may have adverse effect on the biodiversity.

Select the correct answer using the codes given below:

(a) 1, 2 and 3 only

(b) 2 and 3 only

(d) 1, 2, 3 and 4

16. Biomass gasification is considered to be one of the sustainable solutions to the power crisis in India. In this context, which of the following statement(s) is/are correct?

Coconut shells, groundnut shells and rice husk can be used in biomass gasification.
The combustible gases generated from biomass gasification consist of hydrogen and carbon dioxide only.
The combustible gases generated from biomass gasification can be used for direct heat generation, but not in internal combustion engines.

Select the correct answer using the codes given below:

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

2011

1. Consider the following:

Photosynthesis
Respiration
Decay of organic matter
Volcanic eruption

Which of the above add carbon dioxide to the carbon cycle on earth?

(a) 1 and 4 only

(b) 2 and 3 only

(d) 1, 2, 3 and 4

2. The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is reason?

(a) Ice is a bad conductor of heat.

(b) Since the surface of the lake is at the same temperature as the air, no heat is lost.

(d) None of the above

3. Regular intake of fresh fruits and vegetables is recommended in the diet since they are a good source of antioxidants .How do antioxidants help a person maintain health and promote longevity?

(a) They activate the enzymes necessary for vitamin synthesis in the body and help prevent vitamin deficiency.

(b) They prevent excessive oxidation of Carbohydrates, fats and proteins in the body and avoid unnecessary wastage of energy.

(d) They activate certain genes in the cells of the body and help delay the ageing process.

4. A company marketing food products advertises that its items do not contain trans-fats. What does this campaign signify to the customers?

The food products are not made out of hydrogenated oils.
The food products are not made out of animal fats.
The oils used are not likely to damage the cardiovascular health of consumers.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

5. Aspartame is an artificial sweetener sold in the market. It consist of amino acids and provides calories like other amino acids. Yet, it is used as a lowcalorie sweetening agent in food items. What is the basis of this use?

(a) Aspartame is as sweet as table sugar, but unlike table sugar, it is not readily oxidized in human body due to lack of requisite enzymes.

(b) When aspartame is used in food processing, the sweet taste remains, but it becomes resistant to oxidation.

(c) Aspartame is as sweet as sugar, but after ingestion into the body, it is converted into metabolites that yield no calories.

(d) Aspartame is several times sweeter than table sugar, hence food items made with small quantities of aspartame yield fewer calories on oxidation.

6. A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive , and O positive. The blood group of the adopted son is ?

(a) O Positive

(b) A Positive

(d) Cannot be determined on the basis of the given data

7. What is difference between asteroids and comets?

Asteroids are small rocky planetoids, while comets are formed of frozen gases held together by rocky and metallic material.
Asteroids are found mostly between the orbits of Jupiter and Mars, while comets are found mostly between Venus and mercury.
Comets show a perceptible glowing tail, while asteroids do not.

Which of the statements given above is/are correct?

(a) 1 and 2 only

(b) 1 and 3 only

(d) 1, 2 and 3

8. When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up and dies because

(a) Water from soil cannot rise to aerial parts.

(b) Roots are starved of energy.

(d) Roots do not receive oxygen for respiration.

9. A layer in the Earth’s atmosphere called ionosphere facilities radio communication. Why?

The presence of ozone causes the reflection of radio waves to earth.
Radio waves have a very long wavelength.

Which of the statements given above is/are correct?

(a) 1 only

(b) 2 only

(d) Neither 1 nor 2

10. What is the difference between a CFL and an LED lamp?

To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
The average life span of a CFL is much longer than that of an LED lamp.
A CFL is less energy-efficient as compared to an LED lamp.

Which of the statement(s) given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

11. What is the difference between Bluetooth and Wi-Fi devices?

(a) Bluetooth uses 2.4 GHz radio frequency band, whereas Wi-Fi can use 2.4 GHz or 5 GHz frequency band

(b) Bluetooth is used for Wireless Local Area Networks (WLAN) only, whereas Wi-Fi is used for Wireless Wide Area Networks (WWAN) only

(c) When information is transmitted between two devices using Bluetooth technology, the devices have to be in the line of sight of each other, but when Wi-Fi technology is used the devices need not be in the line of sight of each other

(d) The statement (a) and (b) given above are correct in this context

12. What is “Virtual Private Network”?

(a) It is a private computer network of an organization where the remote users can transmit encrypted information through the server of the organization

(b) It is a computer network across a public internet that provides users access to their organization’s network while maintaining the security of the information transmitted

(d) None of the statements (a), (b) and (c) given above is a correct description of Virtual Private Network

13. A new optical disc format known as the Blue-ray Disc (BD) is becoming popular. In what way is it different from the traditional DVD?

DVD supports Standard Definition video while BD supports High Definition video.
Compare to a DVD, the BD format has several times more storage capacity.
Thickness of BD is 2-4 mm while that of DVD is 1.2 mm.

Which of the statement(s) given above is/are correct?

(a) 1 only

(b) 1 and 2 only

(d) 1, 2 and 3

14. Recently, “oilzapper” was in the news. What is it?

(a) It is an eco-friendly technology for the remediation of oily sludge and oil spills

(b) It is the latest technology developed for under-sea oil exploration

(d) It is the latest technology to control the accidentally caused flames from oil wells

15. At present, scientists can determine the arrangement or relative positions of genes or DNA sequences on a chromosome. How does this knowledge benefit us?

It is possible to know the pedigree of livestock
It is possible to understand the causes of all human diseases.
It is possible to develop disease resistant animal breeds.

Which of the statement(s) given above is/are correct?

(a) 1 and 2 only

(b) 2 only

(d) 1, 2 and 3

16. Microbial fuel cells are considered a source of sustainable energy. Why?

They use living organisms as catalysts to generate electricity from certain substrates.
They use a variety of inorganic materials as substrates.
They can be installed in waste water treatment plants to cleanse water and produce electricity.

Which of the statement(s) given above is/are correct?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

17. A genetically engineered form of brinjal, known as the Bt brinjal, has been developed. The objective of this is

(a) To make it pest-resistant

(b) To improve its taste and nutritive qualities

(d) To make its shelf-life longer

18. The function of heavy water in a nuclear reactor is to

(a) Slow down the speed of neutrons

(b) Increase the speed of neutrons

(d) Both (a) and (c)

19. An artificial satellite orbiting around the Earth does not fall down. This is so because the attraction of Earth

(a) does not exist at such distance

(b) is neutralized by the attraction of the moon

(d) provides the necessary acceleration for its motion

20. Consider the following:

Carbon dioxide
Oxides of Nitrogen
Oxides of Sulphur

Which of the above is/are the emission/emissions from coal combustion at thermal power plants?

(a) 1 only

(b) 2 and 3 only

(d) 1, 2 and 3

21. Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such as orbit when:

The orbit is geosynchronous.
The orbit is circular.
The orbit lies in the plane of the earth’s equator.
The orbit is at an altitude of 22,236 km.

Select the correct answer using the codes given below:

(a) 1, 2 and 3 only

(b) 1, 3 and 4 only

(d) 1, 2, 3 and 4

Science & Technology PYQs (2013-2025)

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