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]

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set 16

Question : 21

Which of the following statements is incorrect regarding the time period of a simple pendulum oscillating with small amplitude? The time period of the pendulum

a) does not depend upon the amplitude

b) is inversely proportional to $√g$

c) is directly proportional to $√l$

d) depends upon its mass, material and shape

Answer: (d)

T = $2π√{l/g}$

Question : 22 [UPPCS (Pre) 2013]

Which type of electromagnetic radiation is used in the remote control of a television?

a) Ultraviolet

b) Visible

c) Infra-red

d) None of these

Answer: (c)

Question : 23 [UPPSC (RI) 2014]

An endoscope is a

a) Simple microscope

b) Type of camera

c) Narrow telescope

d) None of the above

Answer: (d)

Question : 24

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

Question : 25

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)

IMPORTANT general science mcq EXERCISES

set 11 Online Quiz

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1649 heat wave motion sound optics oscillations based general science mcq set 11 question answer pdf
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