set 11 MCQ Questions & Answers Detailed Explanation

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

Questions : Which waves cannot be transmitted through vacuum?

(a) Sound

(b) Heat

(c) Light

(d) Electromagnetic

The correct answers to the above question in:

Answer: (a)

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

Question : 1

Butter paper is an example for ............. object.

a) an opaque

b) a transparent

c) a translucent

d) a luminous

Answer: (c)

Question : 2

Consider the following statements.

  1. A widely used musical scale called diatomic scale has seven frequencies.
  2. The frequency of the tone Sa is 256 Hz and that of Ni is 512 Hz.
Which of the statements given above is/are correct?

a) Only 2

b) Both 1 and 2

c) Only 1

d) Neither 1 nor 2

Answer: (c)

Question : 3

Steam at 100ºC causes more severe burns than the water at the same temperature, because

a) Steam provides more heat

b) Steam is highly combustible

c) Steam is a gas

d) Steam exerts more pressure

Answer: (a)

Question : 4

Colour in a colour television is produced by a combination of three basic colours, they are

a) Red, yellow and green

b) Red, green and blue

c) Red, blue and orange

d) Red, green and brown

Answer: (b)

Question : 5

Rainbow is caused due to

a) interference of light

b) reflection of sun light from air particles

c) dispersion of sun light from water drops

d) diffraction of sun rays from water drops

Answer: (c)

Question : 6

Match Column-I with Column-II :

Column I (Position of the object) Column II (Magnification)
A. An object is placed at focus before a convex mirror 1. Magnification –∞
B. An object is placed at the centre of curvature before a concave mirror 2. Magnification is 0.5
C. An object is placed in focus before a concave mirror 3. Magnification is –1
D. An object is placed at the centre of curvature before a convex mirror 4. Magnification is 0.33
Select the correct answer using the codes given below the lists:

a) A – 2 ; B – 4 ; C – 1 ; D – 3

b) A – 2 ; B – 3 ; C – 4 ; D – 1

c) A – 1 ; B – 2 ; C – 3 ; D – 4

d) A – 2 ; B – 3 ; C – 1 ; D – 4

Answer: (d)

A - 2 : For u = -f,

$1/v + 1/{-f} = 1/f$

∴ v = $f/2$

and M = -$v/u$ = -$\text"f/2"/{-f}$ = 0.5

B - 3 : u = -2f. so v = -2f

M = -$v/u$ = -$({-2f}/{-2f})$ = -1

C - 1 : In concave mirror, u = –2f, v = – ∞

∴ M = -$v/u$ = – ∞,

D - 4 : In convex mirror u = – 2f

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