Test Details

Sound

Feb 01, 7:06 PM

20 minutes

Feb 01, 7:30 PM

25.0 marks

MCQ

25 questions

Sonu classes

Professional

Class Details

Math

Physics

Chemistry

CLASS-IX (CBSE)

Math

Physics

Chemistry

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Question Text

Question 1 :
A worker lives at a distance of 1.32 km from the factory. If the speed of sound air be $330 ms^{-1}$, how much time will the sound of factory siren take to reach the worker?

Question 2 :
Which of the following frequency of sound can be heard by a dog but not by a man?

Question 3 :
State whether given statement is True or False Sonar make use of ultrasound.

Question 4 :
Sound travels slower in water as compared to air. True or false.

Question 5 :
The speed of a supersonic wave, as compared to that of sound is

Question 6 :
Sound from the outside world reach the inner ear through :

Question 7 :
An ultrasonic wave is sent from a ship towards the bottom of the sea. It is found that the time interval between the sending and receiving of the wave is 1.6 s. What is the depth of the sea, if the velocity of sound in the seawater is 1400 m/s?

Question 10 :
State whether true or false. One can judge the approaching of a train by laying an ear on the railway track before hearing it.

Question 12 :
__________ of a sound is that characteristic which distinguishes the two sounds of same pitch and loudness but emitted by two different instruments.

Question 13 :
Which kind of sound is produced in an earthquake before the main shock wave begins?

Question 16 :
Rahul is playing the drums. Then which of the following characteristics of sound would result in increase in loudness?

Question 17 :
The total energy of sound waves E is related to their frequency n as

Question 18 :
The tympanum of the ear receive the sound in the form of

Question 19 :
In the case of sound waves, wind is blowing from source to receiver with speed $U_w$. Both source and receiverare statiolnary. If $\lambda_0$ is the oriqinal wavelength with no wind and $V$ is speed of sound in air then wavelength asreceived by the receiver is given by

Question 21 :
Fill in the blank.The speed of the sound in solid is____   speed of the sound in liquid. 

Question 23 :
Speed of sound in liquid is "x" and in gases it's speed is "y". Then :

Question 25 :
Pitch increases with the increase in ________ of a vibrating body.

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