Physics - Study Mode
[#1256] The plastic material commonly used for making gear wheels is
Correct Answer
(B) Nylons
Explanation
Solution: The plastic material commonly used for making gear wheels is nylons.
[#1257] The reason for a swimming pool to appear less deep than the actual depth is
Correct Answer
(A) Refraction
Explanation
Solution: The apparent depth will look less that its real depth due to the refraction of light. Refraction is the bending of a wave when it enters a medium where it’s speed is different. The refraction of light when it passes from a fast medium to a slow medium bends the light ray toward the normal to the boundary between the two media. The amount of bending depends on the indices of refraction of the two media and is described quantitatively by Snell’s Law.
[#1258] When light passes from one medium to another, this phenomenon of change in its direction is called ________
Correct Answer
(A) Refraction
Explanation
Solution: When light passes from one medium to another, this phenomenon of change in its direction is called refraction.
[#1259] Optical fibre works on which of the following principle of light?
Correct Answer
(D) Total internal reflection
Explanation
Solution: The optical fibre is a device which works on the principle of total internal reflection by which light signals can be transmitted from one place to another with a negligible loss of energy.
[#1260] Which colour of light shows maximum deviation when passed through a prism ?
Correct Answer
(C) Violet
Explanation
Solution: Violet colour of light deviates the maximum during dispersion of white light by the prism as it has least wavelength among all the colours.