Question # 1

Wavelength of a wave for closed pipe having length 'l' in the fundamental mode is.

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2 l

1/2

4 l

l

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

Crests and trough are formed in.

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Longitudinal waves

transverse waves

Stationary waves

Compression waves

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

Which of the following is mechanical wave

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Heat

Light

Sound

None of these

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

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Maximum

Infinite

Zero

Varible

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

Speed of sound in copper is

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38000 ms-1

3600 ms-1

3500 ms-1

3400 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

the louder the sound, the greater will be its.

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Speed

Frequency

Amplitude

Wave length

Sound travel faster in

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CO2

H2

O2

He

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 speed of sound in air does not depend upon

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Temperature

Pressure

Density

Medium

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

The distance covered by wave in 1 sec is

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wavelength

Wave number

Wave speed

Frequency

According to Newton, sound travels in air under conditions of.

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Adiabatic

Isothermal

Isobaric

Isochoric

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

Radar system is an application of.

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Chemical effect

Electric effect

Magnetic effect

Doppler's effect

Diffraction is a special type of

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Reflection

Polarization

Interference

Refraction

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In sonar we use

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Sound waves

Ultrasound waves

Microwaves

Radio waves

The error in speed of sound calculated by Newton at STP is about.

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0 %

14 %

15 %

16 %

A bat finding its correct location by sending

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Matter waves

Ultrasonic waves

Infrasonic waves

electromagnetic waves

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