Physics - Study Mode

[#281] For an object, the state of rest is considered to be the state of ________ speed.
Correct Answer

(D) Zero

Explanation

Solution: The state of rest is considered as state of no speed or of zero speed.

[#282] Noise is measured in
Correct Answer

(D) Decibel

Explanation

Solution: We measure sound intensity (also referred to as sound power or sound pressure) in units called decibels.

[#283] Man perceives sound vibrations in the frequency ranges of
Correct Answer

(D) 20 – 20000 Hz

Explanation

Solution: Human ear perceives frequencies between 20 Hz (lowest pitch) to 20 kHz (highest pitch).

[#284] Instrument used to study the behaviour of a vibrating string is :
Correct Answer

(D) Sonometer

Explanation

Solution: A Sonometer is a device for demonstrating the relationship between the frequency of the sound produced by a plucked string, and the tension, length and mass per unit length of the string.

[#285] Among the following materials sound travels fastest in
Correct Answer

(A) Steel

Explanation

Solution: Among the following materials sound travels fastest in steel.