1.Optical fibre works on the principle of ______.
refraction
scattering
interference
total internal reflection
- Question
Diffusion of light in the atmosphere takes place due to ______.
helium
dust particles
carbon dioxide
water vapours
-
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 -
Question
Formation of DNA from m – RNA is called
Transcription
Reverse transcription
Translation
Replication -
Question
The molecular scissors of DNA are
Helicases
Ligases
Nucleases
Polymerases -
Question
Which of the following does not form a part of the nephron?
Proximal convoluted tubule
Distal convoluted tubule
Loop of Henle
Collecting duct
- 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.
- Question
Consider the following pairs : [UPSC Civil Services, 2014]
Vitamin Deficiency disease
- Vitamin C Scurvy
- Vitamin D Rickets
- 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
- Question
Consider the following diseases [UPSC Civil Services, 2014] - Diphtheria
- Chickenpox
- 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
- Question
Which of the following is/are the example/examples of chemical change? [UPSC Civil Services, 2014] - Crystallization of sodium chloride
- Melting of ice
- 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