Question # 1

If 30 waves per second pass through a medium at a speed 30 ms-1, then the wavelength is.

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30 m

15 m

1 m

28 m

Crests and trough are formed in.

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Longitudinal waves

transverse waves

Stationary waves

Compression waves

10 waves pass through a point in 2 seconds with speed 10 ms-1 the frequency of wave will be

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1 Hz

2 Hz

5 Hz

10 Hz

When two waves having same frequency traveling in same direction combine, phenomenon is called

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Wave motion

Combination of waves

Interference

Diffraction

Sound waves are

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Electromagnetic waves

Transverse waves

Compressional waves

Matter waves

When two identical travelling waves are superimposed, velocity of resultant wave.

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Decreases

Increases

Remain same

Becomes zero

Two tunign forks of frequencies 260 Hz and 256 Hz are sounded together , the number of beats per second is.

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2

258

516

4

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.

Velocity of sound is independent of

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Temperature

Density

Pressure

Medium

Stars moving away from Earth show a

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Green shift

Blue shift

Red shift

Yellow shift

Sound travel faster in

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CO2

H2

O2

He

Teh speed of sound in air is 340 m/s. If the pressure of air is doubled then the speed becomes.

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Double

Half

Four times

Remains same

Star moving towards the earth show

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Red shift

Blue shift

Green shift

Yellow shift

Increase in speed of sound for 1 ^oC rise in temperature is.

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0.61 ms-1

0.61 cms-1

61 ms-1

6.1 ms-1

the velocity of sound is maximum at 20 ^oC in

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Lead

Copper

Glass

Iron

Longitudinal waves do not exhibit

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Reflection

Refraction

Polarization

Diffraction

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

The mechanism of transports energy of all the waves is

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Different

Same

Complicated

Easy

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Physics Fsc Part 1 Chapter 8 Online Test MCQs With Answers

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