set 16 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 16 EXERCISES

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : 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

The correct answers to the above question in:

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 $({i_B}/i_A)$.

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

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 : 2

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 : 3

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.

Question : 4

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 : 5

Which one of the following is used for determining the structure of crystal?

a) UV rays

b) X-rays

c) Gamma rays

d) Visible lights

Answer: (b)

Question : 6

Consider the following natural phenomena.

  1. Terrestrial heating
  2. Reflection of light
  3. Refraction of light
  4. Diffraction of light
Due to which of these phenomena is mirage formed?

a) 1 and 3

b) 2, 3 and 4

c) 1 and 2

d) Only 4

Answer: (a)

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