• Indian Culture for Prelims Preparation
  • Environment and Ecology
  • Economics
  • Geography
  • Science & Technology
  • Indian History
  • Current Affairs


  1. Force and Laws of Motion
  2. Gravitation
  3. Sound
  4. Work and Energy
  5. Friction
  • NCERT Class IX- Science- Chapters 8 to 12
  • NCERT- Class VIII- Chapter 12,15

[2011 Prelims]

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

(a)To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.

(b)The average life span of a CFL is much longer than that of an LED lamp.

(c)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)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.

[2012 Prelims]

1)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?

  1. Thorium is far more abundant in nature than uranium.
  2. On the basis of per unit mass of mined mineral, thorium can generate more energy compared to natural uranium.
  3. Thorium produces less harmful waste in comparison to uranium. Which of the statements given above is/are Correct?

[A]1 Only

[B]2 & 3 Only

[C]1 & 3 Only

[D]1,2 & 3

2)Consider the following statements

If there were no phenomenon of capillarity

  1. it would be difficult to use a kerosene lamp
  2. one would not be able to use a straw to consume a soft drink
  3. the blotting paper would fail to function
  4. the big trees that we see around would not have grown on the Earth

Which of the statements given above are correct?

[A]1, 2 and 3 only

[B]1, 3 and 4 only

[C]2 and 4 only

[D]1, 2, 3 & 4

[2013 Prelims]

1)Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this?

  1. Dispersion
  2. Refraction
  3. Internal reflection Select the correct answer using the codes given below?

[A]1 and 2 only

[B]2 and 3 only

[C]1 and 3 only

[D]1, 2 and 3


2)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

[C]Weak nuclear force causes radioactivity

[D]Strong nuclear force holds protons and neutrons inside the nucleus of an atom

3)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?

  1. 1,2 and 3
  2. 3, 4 and 5
  3. 1, 2 and 4
  4. 2, 3 and 5

4)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

[C]1 and 3

[D]None of the above

5)With reference to technologies for solar power production, consider the following statements:

  1. ‘Photovoltaics’ is a technology that generates electricity by direct 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.
  2. Photovoltaics generates Alternating Current (AC), while Solar Thermal generates Direct Current (DC).
  3. India has manufacturing base for Solar Thermal technology, but not for Photovoltaics.

Which of the statements given above is / are correct?

(a) 1 only

(b) 2 and 3 only

(c) 1, 2 and 3

(d) None

[2017 Prelims]

1)  The terms ‘Event Horizon’, ‘Singularity’, `String Theory’ and ‘Standard Model’ are sometimes seen in the news in the context of

(a) Observation and understanding of the Universe

(b) Study of the solar and the lunar eclipses

(c) Placing satellites in the orbit of the Earth

(d) Origin and evolution of living organisms on the Earth

Answer: A

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

(a) To detect neutrinos

(b) To detect gravitational waves

(c) To detect the effectiveness of missile defence system

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

Answer: B