Sound - Olympiad Level MCQ, Class 9 Science - Class 9 MCQ
25 Questions MCQ Test - Sound - Olympiad Level MCQ, Class 9 Science
If the frequency of a wave is 25 Hz, the total number of compressions and rarefactions passing through a point
in 1 second is
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Time period of a wave in a medium is the time taken by:
Amplitude of a longitudinal wave in a medium:
Non-mechanical (electromagnetic) wave can propagate in :
The linear distance between a compression and a rarefaction or a crest and a trough is :
A longitudinal wave travels in water from west to east. The direction which the particles of medium move:
A stretched string is plucked gently to produce a note. The string is producing:
A stretched slinky is given a sharp push along its length. A wave travels from one end to another. The wave
so produced is :
A longitudinal sound wave in air consists:
The density of air at some point in a longitudinal sound wave is minimum at an instant. The pressure of air
at that point is :
Which of the following is an elastic wave?
Infrasonic vibrations have frequency:
The sound waves having a frequency more than 20,000 Hz are called:
The animal which cannot hear ultrasonic waves is :
The bat hunts it prey by emitting and receiving reflected:
A sonic boom is produced in the air when an aircraft flies at a speed:
A boy sitting in a boat fires a gun. An observer P is at a distance of 50 m from the boat. Another observer
Q is a diver, who is 50 m under water. Both hear the sound of gun:
When the lightning strikes, we hear multiple of cracks of thunder. These multiple reflections of sound are called:
Hearing of repetition of sound after reflection from a distant object is called:
For hearing an echo the minimum distance should be :
An echo is heard only, if the original sound after reflection should reach the ear in :
A bullet is moving at a speed, more than the speed of sound. It is said to be moving at :
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