Sounds waves and Motion MCQ question and answer with solution

21

The persistence of sound in an auditorium is the result of repeated reflections of sound and is called . . . . . . . .

A) Intensity B) Reverberation C) Ranging D) Vibration

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Answer & Solution

Answer: Option B

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22

The tolerable limit of noise for human being is around

A) 45 decibel B) 85 decibel C) 125 decibel D) 155 decibel

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Answer & Solution

Answer: Option B

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23

Ultrasonic waves of frequency 3 × 10⁵ Hz are passed through a medium, where speed of sound is 10 times that in air (speed of sound in air is 300 m/s). The wavelength of this wave in that medium will be of the order of

A) 1 cm B) 10 cm C) 100 cm D) 0.1 cm

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Answer & Solution

Answer: Option A

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24

Consider the following statements.
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statements given above is/are correct?

A) Only 1 B) Only 2 C) Bath 1 and 2 D) Neither 1 nor 2

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Answer & Solution

Answer: Option B

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25

A bomb explodes on the moon. You will heard its sound on earth after . . . . . . . .

A) 20 minutes B) 2 hours 20 minutes C) 3.7 hours D) you cannot hear the sound of explosion

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Answer & Solution

Answer: Option D

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26

The frequency of ultrasound wave is typically

A) above 20 kHz B) above 20000 kHz C) below 20 kHz D) below 02 kHz

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Answer & Solution

Answer: Option A

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27

The loudness of sound depends upon the

A) velocity of sound waves in themedium B) amplitude of the sound waves C) frequency of the sound waves D) frequency and velocity of the sound waves

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Answer & Solution

Answer: Option B

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28

Speeds greater than the speed of sound in air are known as . . . . . . . .

A) Supersonic B) Solar C) Infrasonic D) Ultrasonic

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Answer & Solution

Answer: Option A

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29

Which one of the following statement(s) is/are not correct?

A) The response of the ear to sound of increasing intensity is approximately logarithmic B) The sensitivity of the human ear does not vary with the frequency of the sound C) When two or more waves traverse the same medium, the displacement of any element of the medium is the algebraic sum of the displacements due to each wave D) Longitudinal waves can travel in all media; solids, liquids and gases

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Answer & Solution

Answer: Option B

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30

The word radar is derived from?

A) Retro Diagnosis And Recognition B) Radio Detection And Resolution C) Rapid Detection And Reaction D) Radio Detection And Ranging

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Answer & Solution

Answer: Option D

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Sounds waves and Motion MCQ question and answer with solution | Physics Gk MCQs