set 10 MCQ Questions & Answers Detailed Explanation

Question : 1

Consider two identical iron spheres , one which lie on a thermally insulating plate, while the other hangs from an insulatory thread. Equal amount of heat is supplied to the two spheres

a) Their temperature will be equal

b) Temperature of A will be greater than B

c) Temperature of B will be greater than A

d) Can’t be predicted

Question : 2

A worker was working on the rail track. A boy at a distance holds his ear near the rail track. This boy was able to hear sound of the blow of workman twice. It is because of

a) The speed of sound is greater in air than in steel

b) Part of the sound wave is reflected between the rail tracks

c) The speed of sound is greater in steel than in air

d) His ears are at different distance from the source

Question : 3

Which one of the following is the mode of heat transfer in which warm material is transported so as to displace a cooler material ?

a) Convection only

b) Conduction only

c) Radiation

d) Both conduction and convection

Question : 4

Which of the following is used to find the depth of sea?

a) ECHO

b) RADAR

c) SONAR

d) None of these

Question : 5

Consider the following statements:

1. Light of longer wavelength are scattered much more than the light of shorter wavelength.
2. The speed of visible light in water is 0.95 times the speed in vacuum.
3. Radio waves are produced by rapidly oscillating electrical currents.
4. To detect the over speeding vehicles, police use the Doppler effect of reflected short radio waves.

a) 2 and 4

b) 1 and 2

c) 1 and 3

d) 3 and 4

Question : 6

Consider the following statements:

1. Light has transverse wave nature.
2. Light cannot travel in vacuum.
3. No particle can ever move at a speed greater than the speed of light in vacuum.

a) 2 and 3

b) 1 and 2

c) 1 and 3

d) 1, 2 and 3