Waves MCQ's 1

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MCQ's with answers from chapter 8 Waves Physics book 1 for FSC pre engineering and pre medical for Board of Intermediate and Secondary education. Also For Entry Test Preparation for UET, NUST, PIEAS, GIKI, AIR, FAST, WAH University, UHS, other engineering Universities and Medical Colleges.

1. A source of sound is moving towards a stationary observer with 1/10 of the speed of sound. The ratio of apparaent to actual frequency of sound is:

A) 10/9
B) 11/10
C) 11/9
D) 9/11

2. Which waves are used for under water communication:

A) radio wave
B) ultrasonic
C) micro waves
D) Infrasonic

3. Which of the given cannot receive the ultrasonic

A) dolphin
B) bat
C) cat
D) human

4. Two waves superimposed on each other, for constructive interference their phase difference is:

A) 2nπ
B) (2n+1)/2
C) (n+1/2)π
D) (2n+1)/π

5. velocity of sound in a gas is proportional to:

A) square root of isothermal elasticity
B) adiabatic elasticity
C) sequare root of adiabatic elasticity
D) isothermal elasticity

6. A big explosion on the moon cannot be heard on the earth because:

A) the explosion produced high frequency sound waves which are inaudible
B) sound waves require a material medium for propagation
C) sound waves are absorbed in the atmosphere of moon
D) sound waves are absorbed in earth's atmophere

7. Sound waves in air cannot be polarized because:

A) Their speed is small
B) they require medium
C) these are longitudinal
D) their speed is temperature dependent

8. Ultrasonic waves are those waves:

A) which a man can hear
B) which a man cannot hear
C) which are of high velocity
D) which have high amplitude

9. The velocity of sound in air is not affected by changes in:

A) moisture content of the air
B) the temperature of the air
C) the atmospheric pressure
D) the composition of the air

10. Which of the following properties of a wave does not change with a change in medium?

A) frequency
B) wave length
C) velocity
D) atmosphere