set 10 MCQ Questions & Answers Detailed Explanation

Question : 1

Let the average temperatures in Centigrade (C) and Fahrenheit (F) be $C↖{-}$ and $F↖{-}$ . If $C↖{-}$ and $F↖{-}$ are related to F = $9/2$C + 32, then $F↖{-}$ and $C↖{-}$ have the relation

a) $F↖{-} = C↖{-}$ + 32

b) $F↖{-} = 9/2 C↖{-}$

c) $F↖{-}= 9/5 C↖{-}$ + 32

d) $F↖{-} = 9/5C↖{-}$ - 32

Question : 2

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

Question : 3

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 : 4

Assertion (A):
In a motion picture, usually 24 frames are projected every second over the whole length of the film.
Reason (R):
An image formed on the retina of eye persists for about 0.1s after the removal of the stimulus.
Code

a) (A) is true, but (R) is false

b) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

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

d) (A) is false, but (R) is true

Question : 5

The temperature of a room is 77°F. What would it be on the Celsius scale?

a) 60°C

b) 25°C

c) 45°C

d) 350°C

Question : 6

Twinkling of stars is on account of

a) large size of stars

b) large distance of stars and storms in air

c) small size of stars

d) large distance of stars and fluctuations in the density of air