set 4 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following statements is/are correct about sound?

1. Sound is produced by a vibrating body.
2. Sound needs a medium for propagation.
3. If 2 sounds are equally loud, then their pitch will also be equal.

a) 1, 2 and 3

b) 1 and 3

c) 3 only

d) 1 and 2

Question : 2

Match list I with list II and select the correct answer using the codes given below the lists.

a) A – 3, B – 4, C – 2, D – 1

b) A – 2, B – 3, C – 4, D – 1

c) A – 2, B – 1, C – 4, D – 3

d) A – 3, B – 4, C – 1, D – 2

Question : 3

Why is sound heard with more intensity through CO₂ than through the air ?

a) Density of CO₂ is less than that of air

b) Density of CO₂ is more than that of air

c) Air is bad conductor of heat

d) CO₂ is a compound, but air is a mixture of gases.

Question : 4

Assertion (A):
The danger signal is made up of red colour.
Reason (R):
Red colour is scattered the least.
Select the correct answer using the codes given below.

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

Consider the following statements : Sound waves can undergo

1. reflection
2. refraction
3. interference

a) 2 and 3 only

b) 1 and 2 only

c) 1 and 3 only

d) 1, 2 and 3

Question : 6

A periodic wave is produced on a stretched string. Note the following quantities associated with the wave and the string

1. frequency
2. tension in the string
3. wavelength
4. linear density of the string

a) 1 and 2

b) 1 only

c) 3 and 4

d) 1, 2, 3 and 4