The Learning Hub

Sunday, 4 October 2015

SOUND (mcq--2)

Question No. 1

A source produces 20 crests and 20 troughs in 0.2 second. Find the frequency of the wave.

	200Hz
	1Hz
	100Hz
	150Hz

Question No. 2

A wave moves a distance of 10m in 0.05 second. Find the wavelength of the wave if frequency is 200Hz?

	0.5m
	0./m
	1m
	0.8M

Question No. 3

Statement A: Speeds greater than the speed of sound in air are called infrasonic speed. Statement B: the amount of sound energy, passing each second through unit area is called intensity of sound. Which of the above two statement is true

	Statement B
	Both A and B
	neither A or B.
	Statement A

Question No. 4

“Wave motion shifts mass from one region to another” The above statement is

	True
	Partially false.
	Partially true
	False

Question No. 5

The frequency of a source on sound is 546 Hz. It vibrates ___________ times in a second

	546.0
	1092
	1546
	223

Question No. 6

A sound wave travels at a speed of 344mS−1. If its wavelength is 0.02m, what is the frequency of wave?

	none of these.
	17200Hz
	17820Hz
	1700Hz

Question No. 7

Calculate the wavelength of a sound wave whose frequency is 820Hz and speed is 440m/s in a given medium.

	0.57
	0.55
	0.53
	0.50

Question No. 8

“Due to the high power of ultrasound waves. It is used for breaking and cutting objects” The above statement is

	Partially True
	False
	Partially false.
	True

Question No. 9

Cochlea, semi circular canals and the auditory nerve are associated with

	Inner ear
	External ear
	None of these
	Middle ear

Question No. 10

Statement A: Porpoises use ultrasound for navigation and location of food in dark. Statement B: When you listen to music or watch TV at home, the noise level is 100-120 decibels. Which of the two statements is true

	Statement A
	Statement B
	both A and B
	Neither A or B.

Question No. 11

‘The angle of incidence is equal to the angle of reflection’ is one of the low of reflection of

	both Light waves and Sound waves
	Light waves
	Magnetic waves.
	Sound waves

Question No. 12

Wave motion is a periodic ____________ produced by a vibrating body.

	Disturbance
	Energy
	Energy
	Momentum

Question No. 13

Find the correct statement

	the S. I unit of retardation is – ms−2
	the motion of the athletes is uniform
	displacement is a scalar quantity
	all of these.

Question No. 14

Statement A: Molecules also move from one place to another in wave motion. Statement B: Electromagnetic waves don’t need material medium to travel. Which of the two statement is true

	Both Aand B
	Statement A
	Statement B
	Neither A or B.

Question No. 15

Find the incorrect statement,

	Ultrasound is produced by electronic oscillator.
	The distance between crest and trough is λ2
	120. dB means intensity is 1W/m2
	The speed of the wave doesn’t depend on properties of the medium.