Test Details

Sound

Jan 02, 6:00 PM

60 minutes

Jan 02, 7:00 PM

50.0 marks

MCQ

50 questions

Shefali Singha

I am a Mathematics teacher . I used to teach mathematics in St. Xavier's School, Jamshedpur.

Class Details

Mathematics

class9 jhargram

Mathematics

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Question Text

Question 3 :
What happens when prong of a tuning fork is stretched outward from its normal position?

Question 4 :
What are the low pressure regions known as which are created when tuning fork vibrates?

Question 5 :
The frequency of a wave traveling at a speed of $500 m/s$ is $25 Hz$. Its time period will be :

Question 6 :
Which is true for a wave? (here n = frequency, T = time period).

Question 8 :
Answer the question: A quiet sound is produced by a loudspeaker. The loudness of the sound is increased. Which property of the sound wave is increased ?

Question 9 :
When we increase the loudness of sound of a TV, the property of sound that changes is:

Question 10 :
Fill in the blank.<div>The time taken by ___ oscillation to complete is called time period. </div>

Question 12 :
What is the time period of a wave having frequency of $50 \ Hz$?

Question 13 :
Ultrasonic sound waves are produced by which of the device below?

Question 15 :
A source is producing 15 oscillations (waves) in 3 seconds. Find its frequency?

Question 16 :
A sound wave completes $24$ cycles in $0.8\;s$. The frequency of the wave is :

Question 17 :
Some animals get disturbed and start running here and there just before the earthquakes occur because they can hear______________?

Question 18 :
A tuning fork vibrates with $2$ vibrations in $0.4\ s$. Its frequency is:

Question 21 :
If 1500 oscillations are produced in $5$ seconds, what is the frequency in hertz?

Question 22 :
An object attached to one end of a spring makes 20 vibrations in 10s. Its frequency is

Question 24 :
Human ears can sense sound wave travelling in air having wavelength of ................... .

Question 27 :
Which of the following frequency of sound can be heard by a dog but not by a man?

Question 28 :
The property of ultrasonic waves used in manufacturing emulsion for photographic films is its ________.

Question 29 :
The use of ultrasound waves to investigate the action of the heart is called.

Question 31 :
If a vibrator strikes the water 50 times in 5 second, then the frequency of wave is________.

Question 32 :
A sound wave completes $24$ cycles in $0.8\;s$. The time period of the wave would be:

Question 33 :
Time period of a sound wave having the wavelength 0.2 m and frequency 10 Hz will be

Question 34 :
High pitched sound : Whistling : : Low pitched sound : ................

Question 36 :
It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice:

Question 40 :
Which of the following frequencies can be heard by a normal human being?

Question 45 :
Mark the incorrect statements. (a) intensity of sound depends on the response of our ears (b) loudness can be measured as a physical quantity (c) loudness is a subjective quantity.

Question 46 :
A source produces 60 rarefactions and 60 compressions in 0.6 s. Distance between a compression and the next (consecutive) rarefaction is 150 cm. Find the frequency of the wave :

Question 47 :
A person is listening to a tone 500 Hz sitting at a distance of 450 m from the source of the sound. What is the time interval between the successive compression from the source ?

Question 48 :
Time taken to complete 6 successive compressions if the time between two successive compressions of a wave is 4 sec is :

Question 49 :
The number of cycles an oscillator completes in each second is called its _______________.

Question 50 :
<div>Fill in the blank.</div><div>In longitudinal waves, the particles vibrate in _______ direction of propagation. </div>

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