ECAT Pre General Science Physics Chapter 8 Waves

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  • Chapter NameCh 8 - Waves

ECAT Pre General Science Physics Chapter 8 Waves

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ECAT Pre General Science Physics Chapter 8 Waves

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Question # 1

The expression for restoring force is

Question # 2

Waves transport energy

Question # 3

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

Question # 4

At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is

Question # 5

Two sound waves of slightly different frequencies propagating in the same direction produce beats due to

Question # 6

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

Question # 7

Energy is not carried by

Question # 8

The restoring force always directed towards the

Question # 9

Sound waves in air always

Question # 10

The velocity of sound is greatest in

Question # 11

To hear a clear echo, the reflecting surface must be at a minimum distance of

Question # 12

Decibel is unit of

Question # 13

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

Question # 14

Which of the following is the longitudinal waves?

Question # 15

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?

Question # 16

It two waves of amplitude 'a' produce a resultant wave of amplitude a, then the phase difference between them will be

Question # 17

The waves which propagate by the collision of material particles are known as

Question # 18

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

Question # 19

For production of beats the two sources must have

Question # 20

The velocity of sound at same temperature is maximum in

Question # 21

Two sources of sound are said to be coherent if

Question # 22

Shock absorber of the car is an example of

Question # 23

Smaller the damping, the resonance will be

Question # 24

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

Question # 25

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

Question # 26

If the mass of the simple pendulum becomes double, its time period

Question # 27

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?

Question # 28

Which one of the following is an example of resonance

Question # 29

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

Question # 30

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

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