Model Questions for Scientific Assistant (IMD) Exam (Paper-2) PHYSICS - Set 21

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1. Short wavelength solar radiation heats the earth, and is re-radiated as longer-wavelength radiation, which is unable to easily escape the Earth’s atmosphere.

a. Conduction
b. Convection
c. Radiation
d. Greenhouse effect

2. Copper and aluminum have outer electrons that are loosely bound to the atoms. This makes these elements

a. poor electrical conductors
b. expensive
c. pure
d. good electrical conductors

3. Radiation from the star “Betelgeuse” is of longer wavelength than the sun. This means that the sun is ___ compared to that star.

a. cooler
b. hotter
c. at the same temperature
d. larger

4. At the same temperature, molecules of hydrogen have ___ speed compared to molecules of oxygen.

a. higher
b. lower
c. the same
d. no

5. At 350 degrees C, your oven radiates with a wavelength that is ___ compared to your stove top that is 500 C.

a. shorter
b. longer
c. the same
d. none of the above

Study Kit for SSC Scientific Assistant (IMD) EXAM 2017

6. To reduce the odds of being burned, would you choose to walk rapidly across a bed of red hot

a. coal
b. iron
c. gold
d. aluminum

7. Fast evaporation occuring at the surface of a liquid and also within the liquid.

a. Evaporation
b. Sublimation
c. Condensation
d. Boiling

8. A solid phase changes to a gas without changing into a liquid on the way.

a. Evaporation
b. Sublimation
c. Condensation
d. Boiling

9. A solid phase changes to a liquid.

a. Sublimation
b. Condensation
c. Boiling
d. Melting

10. A gaseous phase changes to a liquid.

a. Evaporation
b. Sublimation
c. Condensation
d. Boiling

Answers

1. (d) 2. (d) 3. (b) 4. (a) 5. (b) 6. (a) 7. (d) 8. (b) 9. (d) 10. (c)

Study Kit for SSC Scientific Assistant (IMD) EXAM 2017