Question # 1

With which factor disputative power of a grating increases.

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Order of spectrum

Number of lines per centimeter

Order and number of lines per centimeter

Shape of the grating

When two identical travelling waves are superposed, velocity of the resultant wave

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Remains unchanged

Decreases

Increases

Become zero

The variation in the speed of sound with temperature is greater in.

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Gases

Metals

Liquids

Insulators

When mas of a string is increased 4 times its original valve, the velocity of the wave.

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Becomes double

Reduces to one half

Reduces to one fourth

Increases 4 times to its original value

The ripple tank is used to study various features of

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Wave phenomenon

Interferences

Doppler's effect

Reverberation

The wavelength is the distance along the line of wave propagation between two successive particles which have equal

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Velocities

Phases

Amplitude

Displacements

The locus of all points in the same state of vibrations are known as.

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half period zone

A wavefront

A half wave zone

A full wave zone

The ratio of the velocity of sound in hydrogen to the velocity of sound in oxygen is

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4:1

16:1

2:1

8:1

Which of the following is a mechanical wave.

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X rays

Radio waves

Sound wave

Light wave

Which of the following is an example band spectra.

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Black body radiation spectrum

Atomic spectra

Molecular spectra

Anomalous spectrum

Which is the best sound source to produce a pure note.

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Tuning fork

Flute

Drum

Harmonium

Hearing damage is possible at sound pressure of

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0 dB

50 dB

130 dB

195 dB

Sounds of frequencies higher than 20,000 Hz are called.

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Super sonics

Infrasonic

Ultrasounds

Audible sound waves

Difference in the density of two medium when waves are passing from one into another medium always results in the change in.

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Wave speed

Wave direction

Both speed and direction

Wave frquency

If the wave length of a wire is 1 cm and its period is 0.02 s, the velocity of the wave will be

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20 cm s-1

50 cm s-1

60 cm s-1

100 cm s-1

A wave reflected from the boundary of a rarer medium will have phase change

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0 ^o

60 ^o

90 ^o

180 ^o

Sound of frequencies lower than 20 Hz are called.

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Supersonics

Infra sonics

Ultrasonic

Audible sound waves

Which term is used for the persistence of sound in a hall.

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Resonance

Acoustics

Symphony

Reverberation

X-rays eject electrons from matter by

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Pair production

Pair annihilation

Compton effect

Photoelectric effect

A wave that consists of oscillations occurring perpendicular to the direction of energy transfer is called.

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Transvers wave

Longitudinal wave

Stationary wave

Shock wave

When temperature increases, frequency of an organ pipe

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Decreases

Increases

Remain the same

Become zero

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