Physics - Study Mode

[#976] When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to :
Correct Answer

(C) Forced vibrations

Explanation

Solution: 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.

[#977] Quality of a musical note depends on
Correct Answer

(C) Harmonics present

Explanation

Solution: Quality of a musical note depends on harmonics present.

[#978] If a band is played on the moon the sound will
Correct Answer

(D) Not be heard at any distance at all from it

Explanation

Solution: 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.

[#979] The shape of our milky way galaxy is
Correct Answer

(C) Spiral

Explanation

Solution: The shape of our milky way galaxy is spiral.

[#980] The colours of stars depend on their
Correct Answer

(A) Temperature

Explanation

Solution: 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.