Test Details

Sound-1 (Class 9)

Physics science

Nov 18, 10:00 AM

60 minutes

Nov 18, 11:00 AM

50.0 marks

MCQ

50 questions

Birabhadra Pande

I m M.A B.Ed .

Class Details

Maths

English

English Grammar

Social Science

Odia

Hindi Grammar

Class 6,7, 8 , 9 & 10

Maths

English

English Grammar

Social Science

Odia

Hindi Grammar

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Question Text

Question 3 :
Write true or false for each statement Larger is the amplitude , feeble is the second.

Question 4 :
The speed of a supersonic wave, as compared to that of sound is

Question 6 :
An ultrasonic wave is sent from a ship towards the bottom ofthe sea. It is found that the time interval between the sending and receivingof the wave is 1.6 s. What is the depth of the sea, if the velocity of sound inthe seawater is 1400 m/s?

Question 7 :
The equipment based on properties of sound used for medical purposes is based on:

Question 8 :
A child inserted a needle in a man's ear.the man became deaf. Why?

Question 10 :
In which of the following medium speed of the sound is maximum?

Question 12 :
A stone is dropped from the top of a tower of height 300 m into a pond at the base of the tower. When will the sound of the splash be heard at the top?(Velocity of sound = 340 m $s^{-1}$ and g = 9.8 m$s^{-1})$

Question 13 :
Which of the following characteristics of sound will change if there is a change in its waveform ?

Question 14 :
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?

Question 15 :
When the observer and reflector are at rest, the echo and the original sound differ in

Question 16 :
Two children are at the opposite end of an iron pipe. One strucks the end of the pipe with a stone. Calculate the ratio of the time taken by sound waves in air and in iron to reach the other child. Use speed of sound in (i) air $=$ 344 m s$^{-1}$ and (ii) iron $=$ 5130 m s$^{-1}$.

Question 18 :
Speed of sound in liquid is "x" and in gases it's speed is "y". Then :

Question 20 :
Assertion: Ultrasonic waves are longitudinal waves of frequency greater than 20,000 Hz. Reason: The maximum frequency of audible sound waves is 20,000 Hz.

Question 29 :
In an unoccupied hall of a choultry you will experience the echo effect of sound. If the same hall is furnished with almirahs, tables, chairs,and other commodities, you may not experience the echo clearly. It is because,

Question 30 :
Which of the following best describes the wave when it passes into the surrounding air if a sound wave travels through a metal rod with wavelength $\lambda$ and frequency f.

Question 32 :
Three small interlocking bones: the hammer, the anvil, and the stirrup transmit the vibrations of the eardrum to the inner ear.

Question 33 :
The tympanum of the ear receive the sound in the form of_________.

Question 36 :
The time period of a system executing wave motion depends upon

Question 37 :
Aman is kidnapped,blindfolded and imprisoned in a big room. How could the man tell if he was in (a) acity (b) a village (c) a bare room (d) a furnished room?

Question 40 :
A man blows the train whistle as he approaches a crossing. A few moments later he hears an echo of the whistle. A man hears the echo of the whistle because of :

Question 43 :
A sound signal of $128$ vibrations per second has a wavelength of $2.7 m$. Calculate the speed with which wave travels. 

Question 46 :
The persistence of audible sound due to the successive reflections from the surrounding objects even after the source has stopped to produce that sound is called _________.

Question 50 :
Mark the correct statement :i)rock music also becomes less pleasing with excessive reverberation.ii)excessive reverberation is desirable in case of orchestral and choral music. iii)excessive reverberation makes the speech of a person indistinct. 

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