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 [MPPCS (Pre) 2008]

A fan produces feeling of comfort during hot weather, because

a) our perspiration evaporates rapidly

b) one body radiates more heat

c) fan supplies cold air

d) conductivity of air increase

Discuss »

Answer: (a)

Question : 7 [UPPCS (Pre) 2013]

Photosynthesis using the invisible part of the Sunlight is done by some

a) Bacteria

b) Algae

c) Trees

d) Fungi

Discuss »

Answer: (a)

Question : 8 [UPPCS (Mains) 2011]

What does an air conditioner installed in a room control?

a) Humidity and temperature only

b) Pressure and temperature only

c) Temperature only

d) Humidity, pressure and temperature

Discuss »

Answer: (a)

Question : 9

Consider the following statements for a simple harmonic motion:

  1. The magnitude of the velocity of the body is proportional to its displacement from the mean position.
  2. The magnitude of the acceleration of the body is proportional to its displacement from the mean position.
  3. The sum of the kinetic energy and potential energy of the body is always constant.
Which of the statements given above is/are correct?

a) 3 only

b) 1 and 3

c) 2 and 3

d) 2 only

Discuss »

Answer: (c)

Let the displacement (y) of a particle executing SHM at an instant be given by.

y = a sin (ωt + φ)

velocity, v = ${dy}/{dt}$ = aω cos(ω + φ)

Hence, the magnitude of the velocity of a body is not proportional to its displacement from the mean position.

Acceleration, A = ${dv}/{dt}$  = –aω2 sin (ωt + φ) = - ω2y

Hence, |A| ∝ y

The total energy in SHM is given by

E = PE + KE = EP + EK = 1/2 mω2a2 = a constant

Question : 10

If you go on increasing the stretching force on a wire in a guitar, its frequency.

a) remains unchanged

b) increases

c) decreases

d) None of these

Discuss »

Answer: (b)

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1640 light thermodynamics sound optics and oscillations based general science mcq set 2 question answer pdf
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