Question # 1

Which of the following is/are example/s if mechanical waves i.e. waves generated in _______:

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Rope

Coil of spring

Water

All of them

Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity?

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

The square of 0.4 is:

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Greater than 0.4

Smaller than 0.4

Equal to 0.4

None of them

The distance covered by the wave in one second is:

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Wave number

Wave length

Frequency

Wave speed

Acceleration of the mass at any instant is given by

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a=k/m x

a= - m/k x

a = - k/m x

a=m/k x

In the formula for finding the speed of waves in the spring, unit of m in SIn units is:

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kg

kg-meter

kg/meter

Meter/kg

Which waves are used in sonography?

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Microwaves

Infra red waved

Sound waves

Ultrasonic waves

SI unit of wave length is:

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Kilometer

Metre

Centimetre

Hertz

The temperature at which the speed of sound becomes double as was at 27°C is

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273°C

0°C

927°C

1027°C

When the bob of simple pendulum is at extreme position, its K.E. will be

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maximum

minimum

zero

all of them

When a wave is travels from one place to another, it transfers:

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Matter

Energy

Momentum

Both B and C

What is frequency of radio waves transmitted by a station, if the wavelength of those waves is 300 m?

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1 MHz

10 Hz

1 GHz

100000 Hz

The bob of a simple pendulum is suspended by

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string

heavy inextensible string

light extensible string

light inextensible string

The maximum displacement of a body on either side of its equilibrium position is called

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frequency

amplitude

displacement

time period

Which one of the following wave motions is transverse:

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Wave motion produced in water when a piece of stone is thrown into it

Pulling of weight hanging vertically with a spiral spring

Both of these

None of these

If the length of second pendulum becomes four times then its time period will become

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Four time

Two times

Six times

Eight times

When a body is pulled away from its rest or equilibrium position and then released, the body oscillates due to

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applied force

momentum

restoring force

none of them

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

If the amplitude of sound is doubled and the frequency reduced to one-fourth, the intensity of sound at the same point will be

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Increasing by a factor of 2

Decreasing by a factor of 2

Decreasing by a factor of 4

Unchanged

Transverse waves can be set up:

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Solids

Liquids

Gases

All of them

Which of the following medium/media can transmit both transverse and longitudinal waves:

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Solids

Liquids

Gases

All of them

The velocity of sound in air depends upon

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Density and elasticity of gas

Pressure

Wavelength

Amplitude and frequency of sound

When the bob of simple pendulum is at mean position, its K.E will be

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maximum

minimum

zero

all of them

Of the following, the option ______ reminds of longitudinal waves.

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Sound waves

Heat waves

Electromagnetic waves

Light waves

If a simple pendulum is shifted from karachi to K-2 cliff, its time period

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remains the same

decreases

increases

none of them

The frequency of free vibrations is known as

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free frequency

forced frequency

natural frequency

un-natural frequency

Time period of simple pendulum is independent of

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length

mass

acceleration due to gravity

none of them

There is no net transfer of energy by particle of medium in

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Longitudinal wave

Transverse wave

Progressive wave

Stationary wave

When a body moves to and fro motion, this type of motion is called

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translatory motion

circular motion

oscillatory motion

all of them

If one end of a rubber cord is fixed with a support and the other end is wiggled by hand, the waves generated on the card are:

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Stationary waves

Transverse waves

Both of these

None of these

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