Question # 1

Beats can be heard when difference of frequency is not more than.

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8 Hz

10 Hz

4 Hz

6 Hz

Radar system is an application of.

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Chemical effect

Electric effect

Magnetic effect

Doppler's effect

The pitch of sound deepens upon

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Intensity of sound

Loudness of sound

Wavelength of sound

Frequency of sound

In which medium the speed of sound is greater.

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Oxygen

Air

Water

copper

An oscillating mass-spring system produces

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Sound waves

Electromagnetic waves

Light waves

Periodic waves

When sound waves enter in different medium, the quantity that remains unchanged is.

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Intensity

Speed

Frequency

Wave length

Sound travel faster in

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CO2

H2

O2

He

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

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Decreases

Increases

Remain same

Becomes zero

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

If the wave motion is 0.01 sec and wave speed is 100 ms-1 then frequency of wave is.

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0.5 Hz

1 Hz

10 Hz

100 Hz

The wavelength of fundamental note in one end closed pipe in term of length 'l' of pipe is.

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4 l

2l

l

1/4 l

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

Who did give the correct formula for the speed of sound in air?

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Boyle

Laplace

Newton

Einstein

Crests and trough are formed in.

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Longitudinal waves

transverse waves

Stationary waves

Compression waves

Velocity of sound is independent of

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Temperature

Density

Pressure

Medium

In stationary waves, the velocity of particle at the node is.

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Maximum

Infinite

Zero

Varible

The periodic variations of sound between maximum and minimum loudness are called.

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Doppler's effect

reflection

Laplace correction

Beats

If a stretched string 4 m long and it has 4 loops of stationary waves, then the wave length is.

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1m

2 m

3 m

4 m

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Physics Fsc Part 1 Chapter 8 Online Test MCQs With Answers

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