Physics - Study Mode

[#346] Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
Correct Answer

(D) Mirage

Explanation

Solution: Of the following natural phenomena, mirage is known in Sanskrit as 'deer's thirst'?

[#347] Inside an aeroplane, flying at a high altitude,
Correct Answer

(B) normal atmospheric pressure is maintained by the use of air pumps.

Explanation

Solution: The air pressure in an aircraft (cabin pressure) is kept higher than the atmospheric pressure at high altitudes to avoid discomfort to passengers due to low outside air pressure. This pressure is called cabin pressurization. Hence the normal atmospheric pressure is maintained by the use of air pumps.

[#348] Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
Correct Answer

(C) Air, water and iron

Explanation

Solution: Increasing order of velocity of sound in the following media is as follows : Air, water and iron.

[#349] One thousand microns is equal to
Correct Answer

(A) 10 -3 m

Explanation

Solution: One thousand microns is equal to 10 -3 m.

[#350] Fibre optics work on the principle of
Correct Answer

(C) Total internal reflection

Explanation

Solution: An optical fiber is a cylindrical dielectric waveguide (nonconducting waveguide) that transmits light along its axis, by the process of total internal reflection.