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NDA CDS Civil Services Examination
SSC CGL SSC CHSL SSC MTS SSC GD SSC CPO SSC JE SSC Stenographer
IBPS Clerk IBPS PO IBPS SO IBPS RRB SBI Clerk SBI PO SBI SO RBI Grade B RBI Assistant
RPF SI RPF Constable RRB Group D RRB JE RRB ALP RRB NTPC

SET-1

1. What is the velocity of sound in air?

A. 232 m/sec

B. 343 m/sec

C. 110 m/sec

D. 220 m/sec

Answer : Option (B) 343 m/sec Answer & Solution

2. Among the following , in which material the speed of sound is highest?

A. Steel

B. Nickel

C. Iron

D. Aluminium

Answer : Option (D) Aluminium Answer & Solution

3. Loudness of sound is proportional to the ____ of the amplitude of the vibration producing the sound

A. square root

B. square

C. cube root

D. cube

Answer : Option (B) square Answer & Solution

4. If an object executes 10 oscillations per second, then its frequency in kilohertz is equal to

A. 0.01

B. 10

C. 1

D. 0.1

Answer : Option (A) 0.01 Answer & Solution

5. Sound waves in air are

A. Polarized

B. Longitudinal

C. Electromagnetic

D. Transverse

Answer : Option (B) Longitudinal Answer & Solution

6. The reverberation of sound in a hall is due to continued

A. absorption

B. reflection

C. defraction

D. interference

Answer : Option (A) absorption Answer & Solution

7. The approximate intensity level of sound in dB which can cause damage to the ear drum is

A. 160 dB

B. 130 dB

C. 120 dB

D. 140 dB

Answer : Option (D) 140 dB Answer & Solution

8. Voice of your friend can be recognized by its

A. Velocity

B. quality

C. intensity

D. pitch

Answer : Option (B) quality Answer & Solution

9. The ratio of the velocity of a body to the velocity of sound is called

A. Natural number

B. Magic number

C. Laplace number

D. Mach nuymber

Answer : Option (D) Mach number Answer & Solution

10. Noise pollution is created if noise is in excess to

A. 80 dB- 99 dB

B. 40 dB - 65 dB

C. 50 dB - 60 dB

D. 70 dB - 75 dB

Answer : Option (A) 80 dB- 99 dB Answer & Solution

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