set 10 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

In lateral inversion

a) upside of the object will be down side of the object.

b) right side of the object will be right side of the image.

c) left side of the object will be left side of the image.

d) right side of the object will be left side of the image.

Question : 3

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 : 4

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

Question : 5

A sonometer wire having a length of 50 cm is vibrating in the fundamental mode with a frequency of 100Hz. Which of the following is the type of propagating wave and its speed?

a) Transverse, 50 m/s

b) Longitudinal, 50 m/s

c) Longitudinal, 100 m/s

d) Transverse, 100 m/s

Question : 6

In SONAR, we use

a) infrasonic waves

b) ultrasonic waves

c) radio waves

d) audible sound waves