Question # 1

If the length of a simple pendulum is 0.25 m its time period would be

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1.0 s

2.0 s

3.0 s

4.0 s

Which of the following is not mechanical wave?

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Sound wave

Light wave

wave produced in spring

None of them

The weight 'mg' of the bob is resolved into

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one component

two components

three components

four components

Example of progressive wave is

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transverse waves

longitudinal waves

both of them

none of them

In compressional wave,the layer of medium having reduced pressure is called:

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Compression

Elasticity

Node

Rarefaction

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

If a freely oscillating system is subjected to an external force, then

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free vibrations will take place

the body will move with its natural frequency

forced vibrations will take place

none of them

In the same medium, velocity of the wave:

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Goes on increasing

Remains constant

Goes on decreasing

None of these

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

The number of vibrating body at any instant from its equilibrium position is called

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displacement

frequency

amplitude

time period

Data transmitted along glass-fiber cables is in the form of pulses of monochromatic red light each of duration 2.5 ns. Which of the following is the best estimate of the number of wavelength in each pulse?

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10³

10⁶

10⁹

10¹²

Laplace formula is derived from

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Isothermal change

Adiabatic change

Isobaric change

None of these

Shock absorber of the car is an example of

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resonance

forced oscillations

interference

damped oscillations

Which one of the following could be the frequency of ultraviolet radiation?

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1.0 x 10⁶Hz

1.0 x 10⁹Hz

1.0 x 10¹²Hz

1.0 x 10¹⁵Hz

In the resonance condition, the amplitude of the oscillator becomes

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very large

very small

zero

any one of them

While describing the motion of a simple pendulum, the frictional effects are

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taken into account

completely ignored

partially ignored

none of them

Example of vibratory motion is

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mass suspended from a spring

a bob of simple pendulum

mass attached to a spring placed

all of them

One complete round trip of the body about its mean position is called

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displacement

vibration

a complete motion

an acceleration

Which waves are used in sonography?

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Microwaves

Infra red waved

Sound waves

Ultrasonic waves

A string is stretched between two points and is plucked at right angles to its length, the vibration produced is:

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Longitudinal wave

Transverse wave

No vibration at all

None of them

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

The distance covered by the wave in one second is:

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Wave number

Wave length

Frequency

Wave speed

Which type of wave can be set up in solids

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longitudinal waves

transverse waves

both of them

none of them

When two progressive waves of nearly same frequencies superimpose and give rise to beats, then

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Frequency of beat changes with time

Frequency of beat changes with location of observer

All particles of medium vibrate simple harmonically with frequency equal to the difference between frequencies of component waves

Amplitude of vibration of particles at any point changes simple harmonically with frequency equal to difference between two component waves

The damping depends upon the

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amplitude

sharpness

both of them

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

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Matter

Energy

Momentum

Both B and C

The velocity of sound in air not effected by changes in

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Moisture contents in air

Temperature of air

The atmosphere pressure

The composition of air

The bob of a simple pendulum is suspended by

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string

heavy inextensible string

light extensible string

light inextensible string

A physical system under going forced vibrations is known as

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Simple harmonic oscillator

Compound harmonic oscillator

Physical harmonic oscillator

driven harmonic oscillator

Ultra-violet rays differ from X-rays in that they

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Cannot be diffracted

Cannot be polarized

Have a lower frequency

Are deviated when they pass through a magnetic field

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