Science & Technology UPSC PYQ 2012

Question 1

Which of the following is/are cited by the scientists as evidence/evidences for the continued expansion of universe?
1. Detection of microwaves in space
2. Observation of redshift phenomenon in space
3. Movement of asteroids in space
4. Occurrence of supernova explosions in space

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Answer

1 and 2

Answer

2 only

Answer

1, 3 and 4

Answer

None of the above can be cited as evidence

Question 2

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 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 compared to uranium. Which of the statements given above is/are correct?

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Answer

1 only

Answer

2 and 3 only

Answer

1 and 3

Answer

1, 2 and 3

Question 3

What is the role of ultraviolet (UV) radiation in the water purification systems?
1. It inactivates/kills the harmful microorganisms in water.
2. It removes all the undesirable odours from the water.
3. It quickens the sedimentation of solid particles, removes turbidity and improves the clarity of water.
Which of the statements given above is/are correct?

Accepted Answer

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Answer

1 only

Answer

2 and 3 only

Answer

1 and 3 only

Answer

1, 2 and 3

16 more Science & Technology 2012 questions await