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sound Class 8 mcq Questions and Answers. We covered all the sound Class 8 mcq Questions and Answers in this post for free so that you can prepare for the competitive exams.
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sound Class 8 mcq Questions and Answers for Students
When a body starts vibrating and continues on its own without external force, the vibrations are known as
a. Forced vibrations
b. Natural vibrations
c. Free vibrations
d. Both b and c
Option d – Both b and c
Vibrations that gradually lose energy and reduce in strength over time are called
a. Forced vibrations
b. Natural vibrations
c. Damped vibrations
d. Resonance
Option c – Damped vibrations
A vibrating object slowly decreases in amplitude mainly because of
a. Air resistance around it
b. Properties of the vibrating object
c. Earth’s gravitational pull
d. None of the above
Option a – Air resistance around it
Pressing a vibrating tuning fork against a tabletop makes the sound louder because
a. The tabletop vibrates with a larger surface area
b. The tabletop has a smaller surface area than the fork
c. The tabletop and fork vibrate with equal area
d. None of the above
Option a – The tabletop vibrates with a larger surface area
The type of vibrations that occur in the table when a tuning fork touches it are
a. Natural vibrations
b. Forced vibrations
c. Free vibrations
d. None of the above
Option b – Forced vibrations
When a tuning fork touches a tabletop, the frequency of vibration matches the
a. Natural frequency of the table
b. Natural frequency of the tuning fork
c. Sum of both frequencies
d. None of these
Option b – Natural frequency of the tuning fork
Vibrations caused by an external, repeating force are called
a. Natural vibrations
b. Forced vibrations
c. Free vibrations
d. Resonance
Option b – Forced vibrations
The frequency produced in an object due to an outside force is
a. Equal to its own natural frequency
b. Twice that of the external force
c. Same as the frequency of the external force
d. None of the above
Option c – Same as the frequency of the external force
When a body vibrates at its natural frequency under the influence of an external force
a. Both frequencies are equal
b. The two frequencies differ
c. Either may happen
d. None of the above
Option a – Both frequencies are equal
If a second object vibrates with a greater amplitude due to the first object, their frequencies must be
a. Identical
b. Different
c. Equal after some time
d. None of the above
Option a – Identical
The frequency at which a simple pendulum swings is primarily determined by
a. Its length
b. The size of the bob
c. The amplitude
d. The shape of the bob
Option a – Its length
Hitting a tuning fork with more force
a. Does not change its frequency
b. Increases its frequency
c. Lowers its frequency
d. Affects it only when hit gently
Option a – Does not change its frequency
If the swing of a pendulum becomes slightly larger or smaller, the frequency
a. Increases with amplitude
b. Stays the same with slight increase
c. Stays the same with slight decrease
d. Both b and c
Option d – Both b and c
A tuning fork’s frequency changes
a. When struck harder
b. When struck gently
c. If its shape or size is altered
d. All of the above
Option c – If its shape or size is altered
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