# Physics MCQs GK objective Questions GK test Set – 26

## Question 1.

Which phenomenon is responsible for the echo of

sound wave?

A. Reflection
B. Refraction
C. Interference
D. Polarisation

Ans: A. Reflection

## Question 2.

Echolocation is an adaptation bats use to

A. Locate flowering plants
B. Hunt insects in flight
C. Find warm places for hibernation
D. All of the above

Ans: D. All of the above

## Question 3.

Speed of sound in air is unaffected by change in

A. Pressure
B. Humidity
C. Temperature
D. Volume

Ans: A. Pressure

## Question 4.

Loudness of sound depends on

A. Frequency
B. Wavelength
C. Amplitude
D. Pitch

Ans: C. Amplitude

## Question 5.

Bats can sense obstacles because they produce

A. Supersonic sound waves
B. Ultrasonic sound waves
C. Infrasonic sound waves
D. Micro sound waves

Ans: B. Ultrasonic sound waves

## Question 6.

A. Detecting and locating the position of objects such as Aeroplanes
B. Locating submerged submarines
C. Locating geostationary satellites

Ans: A. Detecting an A. Detecting and locating the position of objects such as Aeroplanes

## Question 7.

Which one of the following animals can hear

ultrasonic sound ?

A. Rat
B. Squirrel
C. Cat
D. Bat

Ans: D. Bat

## Question 8.

A wavelength of 0.3 m is produced in air and it

travels at a speed of 300 m/s. Then it will be an

A. Audible wave
B. Infrasonic wave
C. Ultrasonic wave
D. Microwave

Ans: A. Audible wave

## Question 9.

What is the minimum distance (in metres) required to

hear an echo?

A. 10
B. 13
C. 17
D. 21

Ans: C. 17

## Question 10.

The instrument which uses sound waves to measure the

depth of oceans is

B. Sonar
C. Altimeter
D. Venturimeter

Ans: B. Sonar

## Question 11.

Which term is not associated with sound wave?

A. Hertz
B. Decibel
C. Candela
D. Mach

Ans: C. Candela

## Question 12.

Sound travels fastest in

A. Vacuum
B. Air
C. Glass
D. Water

Ans: C. Glass

## Question 13.

Megahertz is a measurement of

A. Frequency
B. Speed
C. Wavelength
D. Capacity

Ans: A. Frequency

## Question 14.

Velocity of sound in air does not depend on

A. Density of air
B. Temperature of air
C. Pressure of air
D. Humidity of air

Ans: C. Pressure of air

## Question 15.

Which among the following determines the pitch of a

sound?

A. Amplitude
B. Frequency
C. Loudness
D. Wavelength

Ans: B. Frequency

## Physics GK MCQs all set

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