Question # 1

A girl standing 150 m in front of tall building fires a pistol A boy standing 350 m behind her hears two bangs 1 s apart from this information what is the speed of sound in air.

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150 m s-1

300 m s-1

280 m s-1

330 m s-1

The appearance of colures in their film is due to

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Diffraction

Dispersion

Interference

Polarization

The average amount of energy transported by a wave per unit area per unit time is termed as

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Wave speed

Wave intensity

Wavelength

Wave amplitude

The locus of all points in a medium having the same phase of vibration is called.

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Creast

trough

Wavelength

Wave front

Which of the following is a mechanical wave.

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X rays

Radio waves

Sound wave

Light wave

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

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Tuning fork

Flute

Drum

Harmonium

A point source of light is situated at large distance The nature of the wave front at the point will be.

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Cylindrical

Spherical

Plane

Ellipical

When a ray of light enters from rarer medium to a denser medium its wavelength.

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Increases

Decreases

Remain constant

Vanishes

Newton's rings are experimentally derived from the phenomenon of.

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Polarization of light

Resolution of light

Interference of light

Diffraction of light

Light product by a single Nicole is

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Unpolarized

Plane polarized

Circulatory polarized

Elliptically polarized

The sound velocity in moist air as compared to dry air will be

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More

Less

Same

zero

On which parameter the path difference between two interfering waves depends upon.

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Amplitude

Pitch

Intensity

Phase angle

What is shapes of a pure note

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Sinwave

Sawtooth

Square wave

Triangular wave

The phase velocity is the velocity of a point that moves with a wave at constant phase it is also called.

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Phase speed

Wave speed

Wave velocity

All of these

What will be the effect on the speed of a Transerv wave in a string. If tension is made 4 times.

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Remains the same

Increase a times

Becomes double

Becomes 3 times

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

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Super sonics

Infrasonic

Ultrasounds

Audible sound waves

X-rays eject electrons from matter by

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Pair production

Pair annihilation

Compton effect

Photoelectric effect

The loudness of a sound depend on its

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Frequency

Amplitude

Speed

Both a and b

Newton proposed his corpuscular theory on the basis on

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Newton's rings

Polarization

Dispersion of white light

Rectilinear property of light

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

When a transverse wave is reflected on going from a more dense to a less dense medium.

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There is no phase shift

There is a 180 ^o phase shift

There is a phase shift of 360 ^o

A crest is transformed to a trough

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