Previous Year Questions -general science

1)

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

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

Which of the statements given above is/are correct?


A) 1 only
B) 2 and 3 only
C) 1 and 3 only
D) 1, 2 and 3

2)

Which of the following statements is / are correct?

1. Viruses lack enzymes necessary for the generation of energy.
2. Viruses can be cultured in any synthetic medium.
3. 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
C) 1 and 3 only
D) 1, 2 and 3

3)

The function of heavy water in a nuclear reactor is to


A) Slow down the speed of neutrons
B) Increase the speed of neutrons
C) Cool down the reactor
D) Stop the nuclear reaction

4)

Consider the statements with reference to ‘Ebola Virus’

1. Fruit bats and animals like monkeys are natural hosts.

2. It spreads through direct contact with the blood, secretions, body fluids and aerosol transmission.

3. It can be diagnosed through electron microscopy and ELISA test only.

Correct statement is/are


A) 1 only
B) 1 and 2 only
C) 2 and 3 only
D) None

5)

Fruits stored in a cold chamber exhibit longer storage life because


A) exposure to sunlight is prevented
B) concentration dioxide in the is increased of carbon environment
C) rate of respiration is decreased
D) there is an increase in humidity

6)

Many transplanted seedlings do not grow because


A) the new soil does not contain favorable minerals
B) most of the root hairs grip the new soil too hard
C) most of the root hairs are lost during transplantation
D) leaves get damaged during transplantation

7)

Which among the following are ‘Nocturnal’ in nature?

1. Bat

2. Catfish

3. Kiwi

4. Koala

Correct Codes


A) 1, 2 and 3 only
B) 1, 3 and 4 only
C) 1, 2, 3 and 4
D) 1 only

8)

India-based Neutrino Observatory is included by the Planning Commission as a mega science project under the 11th five-Year Plan. In this context, consider the following statements:

1. Neutrinos are chargeless elementary particles that travel close to the speed of light.

2. Neutrinos are created in nuclear reactions of beta decay.

3. Neutrinos have a negligible, but nonzero mass.

4. Trillions of Neutrinos pass through human body every second.

Which of the statements given above are correct ?


A) 1 and 3 only
B) 1, 2 and 3 only
C) 2, 3 and 4 only
D) 1, 2, 3 and 4

9)

“A solar flare is a sudden flash of brightness observed over the Sun’s surface or the solar limb, which is interpreted as a large energy release”. Consider the statements with reference to it

  1. They are always followed by a colossal mass ejection.
  2. The flare ejects clouds of neutrons, ions, and atoms through the corona of the sun into space.
  3. They produce radiation across electromagnetic spectrum at all wavelength except visible

Correct code is/are


A) 1 and 2 only
B) 1, 2 and 3
C) 3 only
D) None

10)

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

1. The orbit is geosynchronous.
2. The orbit is circular,
3. The orbit lies in the plane of the Earth’s equator.
4. 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
C) 2 and 4 only
D) 1, 2, 3 and 4

11)

Mercury and its compounds are toxic; despite it is used in variety of products. It is used in

  1. Medicines
  2. Paints
  3. Eye-Drops
  4. Antiseptics
  5. Fungicides

Select the correct codes


A) 1 and 2
B) 1, 2, 3
C) 1, 2, 3, 4
D) 1, 2, 3, 4 and 5

12)

‘Ethanol’ has widespread usages and application. Consider the statements with reference to it

  1. It cannot be used as rocket propellant
  2. It can be used in thermometer
  3. It can be used as an antiseptic
  4. It causes cancer
  5. It can cause birth defects
  6. It cannot be used in DNA extraction because it is highly toxic

Correct code/s


A) 1, 2, 3 and 5
B) 1, 2, 4, 5 and 6
C) 2, 3, 4 and 6
D) 2, 3, 4 and 5

13)

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the 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
C) The density of water is maximum at 4įC
D) None of the statements (a), (b) and (c) given above is correct

14)

Recently a ban on burning of tires was making news. Consider the statement with reference to it.

1. It cannot cause cancer.

2. It releases SO2, CO2 and oxides of nitrogen

3. It can result in mutation

4. It can emit toxic aromatic hydrocarbons

Correct code/s


A) 1 and 4 only
B) 2, 3 and 4 only
C) 2 and 4 only
D) 1, 2, 3 and 4

15)

Consider the following phenomena:

1. Size of the sun at dusk
2. Colour of the sun at dawn
3. Moon being visible at dawn
4. Twinkle of stars in the sky
5. Polestar being visible in the sky

Which of the above are optical illusions?


A) 1, 2 and 3
B) 3, 4 and 5
C) 1, 2 and 4
D) 2, 3 and 5

16)

‘Neutrino’ has been quite frequent in news due to important scientific research. What are the possible sources of neutrinos?

  1. Big Bang
  2. Cosmic Rays
  3. Supernova
  4. Nuclear Bomb
  5. Geological Reactions
  6. Nuclear Reactors
  7. Sun

Correct codes are-


A) 1, 2, 4, 6 and 7
B) 1, 2, 3, 5 and 7
C) 2, 3, 4, 5, 6 and 7
D) 1, 2, 3, 4, 5, 6 and 7

17)

Which of the following can be as a result of ‘Malnutrition’?

1. Obesity

2. Marasmus

3. Kwashiorkar

4. Anorexia

Correct Codes


A) 2 and 3 only
B) 2, 3 and 4 only
C) 1, 2 and 3 only
D) 1, 2, 3 and 4

18)

The term ‘Polymorphism’ is associated with

1. Genetics

2. Material science

3. Computer science

Correct Codes


A) 2 and 3 only
B) 2 only
C) 1 and 2 only
D) 1, 2 and 3

19)

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

1. Across different species of plants.

2. From animals to plants.

3. From microorganisms to higher organisms.

Select the correct solution using the codes given below.


A) 1 only
B) 2 and 3 only
C) 1 and 3 only
D) 1, 2 and 3

20)

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
C) B positive
D) Cannot be determined on the basis of the given data

21)

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

  1. Crystallization of sodium chloride
  2. Melting of ice
  3. Souring of milk

Select the correct answer using the code given below.


A) 1 and 2 only
B) 3 only
C) 1, 2 and 3
D) None

22)

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
C) To make it drought-resistant
D) To make its shelf-life longer

23)

Graphene is frequently in news recently. What is its importance?

1. It is a two-dimensional material and has good electrical conductivity.
2. It is one of the thinnest but strongest materials tested so far.
3. It is entirely made of silicon and has high optical transparency.
4. It can be used as ‘conducting electrodes’ required for touch screens, LCDs and organic LEDs.

Which of the statements given above are correct?


A) 1 and 2 only
B) 3 and 4 only
C) 1, 2 and 4 only
D) 1, 2, 3 and 4

24)

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 organizationís network while maintaining the security of the information transmitted
C) It is a computer network in which users can access a shared pool of computing resources through a service provider.
D) None of the statements (a), (b) and (c) given above is a correct description of Virtual Private Network

25)

Consider the following plants:

1. Rhodendron

2. Rose

3. Mulberry

4. Curry leaf Plant

Which of these plants are propagated by stem cuttings?


A) 1 and 2 only
B) 2 and 3 only
C) 1, 2 and 4 only
D) 1, 2, 3 and 4

26)

Consider the statements about ‘Dark Energy and Dark Matter’.

  1. Dark energy attracts while Dark matter repels.
  2. While dark energy shows itself only on the largest cosmic scale, dark matter exerts its influence on individual galaxies as well as the universe at large.

Correct statement(s) is/are


A) 1 only
B) 2 only
C) Both 1 and 2
D) Neither 1 nor 2

27)

Consider the following:

1. Electromagnetic radiation
2. Geothermal energy
3. Gravitational force
4. Plate movements
5. Rotation of the earth
6. Revolution of the earth

Which of the above are responsible for bringing dynamic changes on the surface of the earth?


A) 1, 2, 3 and 4 only
B) 1, 3, 5 and 6 only
C) 2, 4, 5 and 6 only
D) 1, 2, 3, 4, 5 and 6

28)

During a thunderstorm, the thunder in the skies is produced by the
1. Meeting of cumulonimbus clouds in the sky
2. Lightning that separates the nimbus clouds
3. Violent upward movement of air and water particles

Select the correct answer using the codes given below.


A) 1 only
B) 2 and 3 only
C) 1 and 3 Only
D) None of the above produces the thunder