Question # 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

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

Stars moving away from Earth show a

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Green shift

Blue shift

Red shift

Yellow shift

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

A bat finding its correct location by sending

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Matter waves

Ultrasonic waves

Infrasonic waves

electromagnetic waves

When ever the path difference between the waves is integral multiple of half the wavelength, interference will be

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Constructive

Destructive

(-)ve

(+) ve

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

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Density

Pressure

Temperature

Elasticity

The speed \velocity of sound is greatest in.

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Air

Steel

Ammonia

Water

the example of mechanical waves is

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Water waves

Infrared waves

Radio waves

Ultraviolet waves

The speed of stars and galaxies can be calculated by

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Compton effect

Stefan's law

Doppler's effect

Pascal's law

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

Sound wave can not be

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Reflected

Refracted

Diffracted

Polarized

In vibrating string, the points where the amplitude is maximum are called.

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Nodes

Antinodes

Troughs

Crests

On loading the prong of a tuning fork with wax, the frequency of sound.

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Increases

Decreases

Remains same

First increases then decrease

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

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8 Hz

10 Hz

4 Hz

6 Hz

The process followed by Newton for the determination of speed of sound in air is

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Adiabatic

Isothermal

Isobaric

Isochoric

The waves used in radar speed trap are

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Longitudinal

Sound wave

Micro waves

Matter waves

Two waves of same frequency and moving in the same direction produces.

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Interference

Diffraction

Beats

Stationary waves

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Physics Fsc Part 1 Chapter 8 Online Test MCQs With Answers

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