set 12 MCQ Questions & Answers Detailed Explanation

Question : 1

The rate of flow of heat through a rod depends on:

a) temperature difference across the rod.

b) thermal conductivity of the rod.

c) length of the rod.

d) All of these

Question : 2

Which of the following statement is true?

a) Celestial objects have the greatest velocity

b) The sound has the greatest velocity

c) The light has a greater velocity

d) Rocket has the greatest velocity

Question : 3

The formation of glittering colours in thin foam of soap is the result of which of the following phenomenon?

a) Diffraction and dispersion

b) Total refraction and dispersion

c) Total reflection and interference

d) Polarization and interference

Question : 4

In winter you touch a log of wood and a rod of iron, you will feed rod of iron is colder because

a) In comparison to wood, iron is good conductor of heat

b) In comparison to wood, iron is bad conductor of heat

c) The heat of rod of iron is less than the heat of log of wood

d) The rod of iron is heavier than the log of wood

Question : 5

Which one of the following energy conversions takes place in carrying out the process of photosynthesis?

a) Thermal to biochemical energy

b) Light to thermal energy

c) Light to chemical energy

d) Heat to kinetic energy

Question : 6

When T.V. is switched on

a) Audio is heard immediately but video starts later because video needs some warm up time

b) Video starts immediately but audio is heard later because sound travels at a lesser speed than light

c) Audio and video both start simultaneously

d) It depends on the T.V. brand