light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions

light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

set 10

set 11

set 12

set 13

set 14

set 15

set 16

Question : 6

Two holes of unequal diameters d1 and d2 (d1 > d2 ) are cut in a metal sheet. If the sheet is heated,

physics mechanics mcq question answer 30 hint

a) d1 will increase, d2 will decrease

b) both d12 will decrease

c) both d1 and d2 will increase

d) d1 will decrease, d2 will increase

Answer: (c)

When a body is heated, the distance between any two points on it increases. The increase is in the same ratio for any set of two point.

Question : 7

In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because a narrow slit

a) allows only one colour at a time

b) produces less diffraction

c) increases intensity

d) allows a more parallel beam when it passes through the lens

Answer: (d)

We know that C = sin-1 $(1/μ)$

Given iB > iA, ∴ μB < μA

So B is rarer and A is denser. Light will be totally reflected when it passes from A to B. Now critical angle for A to B

CAB = sin-1 $(1/_Bμ_A)$ = sin-1 $(_Aμ_B)$

sin-1 $(μ_B/μ_A)$ = sin-1 $({i_B}/i_A)$.

Question : 8 [UPPCS (Pre) 2015]

The image formed by astronomical telescope is

a) Real and diminished

b) Virtual and magnified

c) Virtual and diminished

d) Real and magnified

Answer: (b)

Question : 9 [BPSC (Pre) 2002]

What is the distance between two successive crests or successive troughs called?

a) Frequency

b) Wavelength

c) Amplitude

d) None of these

Answer: (b)

Question : 10

The mirror used for the head light of a car is

a) cylindrical

b) spherical concave

c) plane

d) parabolic concave

Answer: (d)

Parabolic reflectors are used to collect energy from a distant source (for example sound waves or incoming starlight) and bring it to a common focal point, thus correcting spherical aberration found in simpler spherical reflectors.

Since the principles of reflection are reversible, parabolic reflectors can also be used to project the energy of a source at its focus outward in a parallel beam, used in devices such as spotlights and car headlights.

IMPORTANT general science mcq EXERCISES

set 16 Online Quiz

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1654 heat wave motion sound optics oscillations based general science mcq set 16 question answer pdf
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