Question # 1

The example of mechanical wave is

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waves in ropes

waves on water surface

waves in air

all of them

The time period of pendulums of different lengths would be

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same

different

both of them

none of them

Progressive waves of frequency 300 Hz are superimposed in produced a system of stationary waves in which adjacent nodes are 1.5 m apart. What is the speed of the progressive waves?

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100 ms^-1

200 ms^-1

450 ms^-1

900 ms^-1

In case of mechanical waves, we study the motion of

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a single particle

collection of particle

any one of them

none of them

Which of the following is an example of a S.H.M?

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motion of a projectile

motion of a train along a circular path

motion of swing

electrons revolving sound the nucleus

Which of the following is not mechanical wave?

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Sound wave

Light wave

wave produced in spring

None of them

transverse wave motion is possible in:

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Air

A mixture of NH₃and O₂

Strings

All of these

The waves in which the particles of the medium have displacement along the direction of propagation of waves are called

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longitudinal waves

transverse waves

non-mechanical waves

none of them

Smaller the damping, the resonance will be

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more flat

more sharp

both of them

none of them

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

None of them

Laplace formula is derived from

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Isothermal change

Adiabatic change

Isobaric change

None of these

In the same medium, velocity of the wave:

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Goes on increasing

Remains constant

Goes on decreasing

None of these

If a wave can be polarized, it must be

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An electromagnetic wave

A longitudinal wave

A progressive wave

A transverse wave

The vibratory or oscillatory motion of a body is

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translatory motion

back and forth motion about its mean position

free all motion

circular motion

A weakly damped system has fairly

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sharp resonance curve

flat resonance curve

both of them

none of them

In the resonance condition, the amplitude of the oscillator becomes

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very large

very small

zero

any one of them

The natural frequency of a pendulum which is vibrating freely, depends upon its

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mass

length

material

all of them

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

In transverse waves, the individual particles of the medium move:

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In circles

Perpendicular to the direction of level

Parallel to the direction of level

None of these

The resonance will be sharp, if the amplitude decreases rapidly at a frequency

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equal to the resonant frequency

slight different from the resonant frequency

greatly different from the resonant frequency

any one of them

A stationary sound wave has frequency 165 Hz (speed of sound in air = 330 m/s) then distance between two consecutive nodes is

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2 m

1 m

0.5 m

4 m

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

The distance covered by the wave in one second is:

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Wave number

Wave length

Frequency

Wave speed

Mechanical waves on the surface of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

If two waves of length 50 cm and 51 cm produced 12 beats per second, the velocity of sound is

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360 m/s

306 m/s

331 m/s

340 ms

The vibrations of factory floor caused by the running of heavy machinery is an example of

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free vibration

natural vibrations

forced vibrations

all of them

The characteristic of a body executing S.H.M is that its acceleration is

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inversely proportional to displacement

directly proportional to displacement

independent of displacement

equal to zero

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 waves moving from a sitar to a listener in air are

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Longitudinal progressive

Longitudinal stationary

Transverse progressive

Transverse stationary

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 external driving force is periodic with a period compareable to the natural period of the oscillator, then we get

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diffraction

beat

interference

resonance

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