Science and Technology previous Year Questions from 2013 (UPSC/ IAS)

1. Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this? (upsc / IAS 2013)

(1) Dispersion

(2) Refraction

(3) Internal reflection

Select the correct Solution using the codes given below.

2. Consider the following phenomena: (upsc / IAS 2013)

(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?

3. Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to (upsc / IAS 2013)

(1) Resist drought and increase absorptive area

(2) Tolerate extremes of PH

(3) Resist disease infestation

Select the correct Solution using the codes given below:

4. Recombinant DNA technology (Genetic Engineering) allows genes to be transferred  (upsc / IAS 2013)

(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.

5. Many transplanted seedlings do not grow because (upsc / IAS 2013)

6. Fruits stored in a cold chamber exhibit longer storage life because  (upsc / IAS 2013)

7. Fruits stored in a cold chamber exhibit longer storage life because  (upsc / IAS 2013)