set 15 MCQ Questions & Answers Detailed Explanation

Question : 1

The normal temperature of human body on the Kelvin scale is

a) 290

b) 300

c) 280

d) 310

Question : 2

Assertion (A) :
A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at Mach Number equal to 1 near the sea level.
Reason (R) :
The velocity of sound depends on the temperature of the surrounding medium.

a) Both A and R are true but R is not a correct explanation of A

b) Both A are R are true and R is the correct explanation of A

c) A is true but R is false

d) A is false but R is true

Question : 3

In scattering of light phenomenon, light falls on tiny particles absorbed by these tiny particles. Then these particles re-emit light in all directions.

1. Intensity of scattered light, $I ∝ 1/λ^4$
2. Greenish-blue appearance of sea water is due to scattering of light
3. In a clear atmosphere of the earth, red colour scatters more than blue colour.

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3

Question : 4

5g ice at 0ºC is mixed with 5g of steam at 100ºC . What is the final temperature?

a) 80ºC

b) 50ºC

c) 100ºC

d) 150ºC

Question : 5

Which of the following is carried by the waves from one place to another ?

a) Wavelength

b) Mass

c) Velocity

d) Energy

Question : 6

At a common temperature, a block of wood and a block of metal feel equally cold or hot. The temperatures of block and wood are

a) greater than temperature of the body

b) equal to the temperature of the body

c) less than the temperature of the body

d) either (b) or (c)