set 11 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
(a) Ultraviolet
(b) Visible
(c) Infra-red
(d) None of these
The correct answers to the above question in:
Answer: (c)
Practice light, heat, thermodynamics, wave motion, sound, optics & oscillations (set 11) Online Quiz
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
An endoscope is a
a) Simple microscope
b) Type of camera
c) Narrow telescope
d) None of the above
Answer »Answer: (d)
Question : 2
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 |
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 »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 : 3
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 »Answer: (c)
Question : 4
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 »Answer: (d)
T = $2π√{l/g}$
Question : 5
A glass bottle containing water tightly corked breaks when it is kep in freeze, because
a) The volume of water decreases on freezing
b) The volume of water increases on freezing
c) Bottle shrinks on freezing
d) Glass is the bad conductor of heat
Answer »Answer: (b)
Question : 6
A ray of light travels from medium I to medium II. The figure given shows the variation of sin of angles of incidence (sin i) in medium I with sin of angle of refraction (sin r) in medium II.
Consider the following statements- Speed of light in medium I > Speed of light in medium II.
- Speed of light in medium I < Speed of light in medium II.
- Light travels from denser medium to rarer medium.
a) 1 and 3
b) 1 only
c) 2 only
d) 2 and 3
Answer »Answer: (d)
Speed of light is more in rarer medium as compared to denser medium.
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