Practice MCQ Questions and answers on Physics-GK

In general, the intensity of a wave is proportional to the square of its amplitude. This has an important implication: relative intensity can be obtained by squaring relative amplitude.
I α a²
So if the intensity ratio is 25:9, the amplitude ratio will be 5:3.

The velocity of sound in air decreases with decrease of temperature.

Infrasonic Sound has a frequency less than the audible frequency range. Frequencies are less than 20 Hz. The infrasonic sounds have below the lower limit of human hearing.

When a vibrating tuning fork is placed on a table, then a large sound is heard due to the entire system begins vibrating and forces surrounding air particles into vibration motion. The tendency of one object to force another adjoining or interconnected object into vibration motion is referred to as a forced vibration.

Quality of a musical note depends on harmonics present.

As there is no atmosphere surrounding the moon, the sound from any band that is played there cannot travel outwards there is no material medium surrounding it for its propagation.

The shape of our milky way galaxy is spiral.

Stars come in lots of different colours, and their colour depends on the temperature of the star. We find that small stars are cool (less than 3000°C) with a red-ish appearance, whereas big heavy stars are hot (over 30,000°C), and have a blue-ish glow.

One free electron is there due to which graphite conducts electricity in the solid state.

The electric current in one part of a circuit is measured with an ammeter, which gives a reading in ampere.