UPSC Science Questions

1.Optical fibre works on the principle of ______.

total internal reflection

  1. Question
    Diffusion of light in the atmosphere takes place due to ______.

dust particles
carbon dioxide
water vapours

  1. Question
    When water is heated from 0°C to 10°C its volume ______.
    increases gradually
    decreases gradually
    first increases and then decreases
    first decreases and then increases

  2. Question
    Formation of DNA from m – RNA is called
    Reverse transcription

  3. Question
    The molecular scissors of DNA are

  4. Question
    Which of the following does not form a part of the nephron?

Proximal convoluted tubule
Distal convoluted tubule
Loop of Henle
Collecting duct

  1. Question
    With respect to respiration, which of the following statement is incorrect?

It is an intra-cellular chemical process.
It is an anabolic process.
It involve breakdown of energy rich molecules.
It is concerned with supply and release of energy.

  1. Question
    Consider the following pairs : [UPSC Civil Services, 2014]

Vitamin Deficiency disease

  1. Vitamin C Scurvy
  2. Vitamin D Rickets
  3. Vitamin E Night blindness
    Which of the pairs given above is/are correctly matched?

1 and 2 only
3 only
1, 2 and 3
None of these

  1. Question
    Consider the following diseases [UPSC Civil Services, 2014]
  2. Diphtheria
  3. Chickenpox
  4. Smallpox
    Which of the above diseases has/have been eradicated in India?

1 and 2 only
3 only
1, 2 and 3
None of these

  1. Question
    Which of the following is/are the example/examples of chemical change? [UPSC Civil Services, 2014]
  2. Crystallization of sodium chloride
  3. Melting of ice
  4. Souring of milk
    Select the correct answer using the code given below:

1 and 2 only
3 only
1, 2 and 3
None of these