Question # 1

the velocity of sound is maximum at 20 ^oC in

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Lead

Copper

Glass

Iron

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

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

The experimental value for the velocity of sound in air is

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233 m-sec^-1

333 m-sec^-1

433 m-sec^-1

533 m-sec^-1

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

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 two consecutive crests of troughs is called

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Time period

Wave length

Frequency

Displacement

Light waves are

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Longtail waves

Transvers waves

Stationary waves

Mechanical wave

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

Stars moving away from Earth show a

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Green shift

Blue shift

Red shift

Yellow shift

When two identical waves superimposed, which can change.

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Wave length

Frequency

Velocity

Amplitude

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

In sonar we use

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Sound waves

Ultrasound waves

Microwaves

Radio waves

The distance between the consecutive nodes 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

With increase of temperature, speed of sound.

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Remains constant

Becomes zero

Decreases

Increases

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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