Practice MCQ Questions and answers on Physics-GK

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

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

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.

Among the following materials sound travels fastest in steel.

Sound levels are measured in decibels(dB), sound level of 80 or more dB can aptly be called noise which can cause serious hearing loss, tensions, high blood pressure, it can induce several disorders prematurely existing, such as hypertension, an increase in blood cholesterol level and is detrimental to health in other aspects when observed for more than maximum tolerable limit of 50 dB.
Hence, the correct answer is 'Above 80 dB'.

Decibel is the SI unit of intensity of sound.

Sound cannot travel through a perfect vacuum. A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibration to work in.

Sound cannot travel through a perfect vacuum. A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibration to work in.

The timbre or quality of a sound depends on its wave form, which varies with the number of overtones, or harmonics, that are present, their frequencies, and their relative intensities. In simple terms, timbre is what makes a particular musical sound have a different sound from another, even when they have the same pitch and loudness.

Amplitude determines the frequency of a sound wave.