set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

The technique used to transmit audio signals in television broadcast is

a) Pulse code modulation

b) Frequency modulation

c) Amplitude modulation

d) Time dimension multiplication

Question : 2

Assertion (A):
A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of the water.
Reason (R):
A light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.
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 : 3

An underwater explosion is caused near the sea-shore. There are two observers, X under water and Y on land, each at a distance of 1 km from the point of explosion then

a) Both will hear the sound at the same time

b) X will hear the sound earlier

c) Y will hear the sound earlier

d) Y will not hear the sound at all

Question : 4

Assertion and Reason are given below.
Assertion (A):
We prefer the white dress in winters.
Reason (R):
White dresses are good reflectors of heat.
Which one among these is the right answer.

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

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

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

Assertion (A) :
A piece of copper and a piece of glass are heated to the same temperature. When touched, thereafter, the copper piece appears hotter than the glass piece.
Reason (R) :
The density of copper is more than that of glass.

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

b) Both A and 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 : 6

Decibel unit is used to measure

a) Sound intensity

b) Magnitude of earthquake

c) Light intensity

d) None of the above