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Physics English Medium Fsc Part 1 Chapter 8 Online MCQs Test MCQs With Answers

Question # 1

In sonar we use

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Sound waves

Ultrasound waves

Microwaves

Radio waves

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Question # 2

The speed of sound is greater in solids due to their high.

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Density

Pressure

Temperature

Elasticity

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Question # 3

If the pressure of a gas is doubled, then speed of sound is.

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Doubled

Become half

Not affected

Increases by four times

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Question # 4

If 20 waves passes through he medium in 2 sec of 10 ms-1 then he wavelength is.

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200 m

2 m

1 m

0.5 m

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Question # 5

According to Newton's formula, the speed of sound in air at STP is

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332 ,ms-1

340 ms-1

350 ms-1

280 ms-1

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Question # 6

A stationary waves is established din a string which vibrates in four segments at a frequency of 120 Hz, Its fundamental frequency is.

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15 Hz

30 HZ

60 Hz

480 Hz

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Question # 7

Frequency range of hearing of cats is.

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20-20000 Hz

10- 10000 Hz

60-20000 Hz

60-70000 Hz

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Question # 8

The waves used in radar speed trap are

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Longitudinal

Sound wave

Micro waves

Matter waves

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Question # 9

In transverse waves the particles of medium vibrate

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Along the direction of wave

Opposite to direction of wave

Perpendicular to direction of wave

Slowly

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Question # 10

In order to produce beats, the two sound waves should have.

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The same amplitude

Slightly different amplitude

The same frequency

slightly different frequencies.

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Question # 11

The distance between two consecutive crests of troughs is called

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Time period

Wave length

Frequency

Displacement

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