Question # 1

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

Two tuning forks of frequencies 240 Hz and 243 Hz are sounded together, the number of beats per second is.

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Zero

2

3

4

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

The apparent change in the pitch of sound due to relative motion is called.

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Carnot theorem

Interference

Doppler effect

Beats

The distance between two consecutive crests of troughs is called

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Time period

Wave length

Frequency

Displacement

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

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

The profile of periodic waves generated by a source executing S.H.M is represented by a.

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Circle

Sine curve

Tangent curve

Cosine curve

The distance between the consecutive nodes is

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

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Interference

Diffraction

Beats

Stationary waves

Diffraction is a special type of

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Reflection

Polarization

Interference

Refraction

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

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

the louder the sound, the greater will be its.

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Speed

Frequency

Amplitude

Wave length

The Newton's formula for the speed of sound in air is

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

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Intensity

Speed

Frequency

Wave length

A set of frequencies which are multiples of the fundamental frequency are called.

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Doppler effect

Nodal frequencies

Beat frequencies

Hamonics

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

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 in ari at 0 ^oC is 332 ms-1, Then the speed at 40 ^oC will be

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372 ms-1

356 ms-1

346 ms-1

332 ms-1

Speed of sound in copper is

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38000 ms-1

3600 ms-1

3500 ms-1

3400 ms-1

When the amplitude of a wave is increase to doubled is energy.

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Remain the same

Increases 4 times

Increases by two times

Decreases by half

The distance between two consecutive trough is called.

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Displacement

Amplitude

Wave length

Wave front

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