Question # 1

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

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

Sound travel faster in

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CO2

H2

O2

He

In order to produce beats, the two sound waves should have.

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The same amplitude

Slightly different amplitude

The same frequency

slightly different frequencies.

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 mechanism of transports energy of all the waves is

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Different

Same

Complicated

Easy

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

The distance between two consecutive trough is called.

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Displacement

Amplitude

Wave length

Wave front

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

In stationary waves the points which always remain at rest are.

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Nodes

Antinodes

Crest

Trough

The speed of sound in air does not depend upon

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Temperature

Pressure

Density

Medium

Speed of sound in aluminum at 20 ^oC is.

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3600 m/s

5100 m/s

5130 m/s

3500 m/s

the velocity of sound is maximum at 20 ^oC in

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Lead

Copper

Glass

Iron

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

the example of mechanical waves is

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Water waves

Infrared waves

Radio waves

Ultraviolet waves

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

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Doppler effect

Nodal frequencies

Beat frequencies

Hamonics

Star moving towards the earth show

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Red shift

Blue shift

Green shift

Yellow shift

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Physics Fsc Part 1 Chapter 8 Online Test MCQs With Answers

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