set 1 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 : 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

The correct answers to the above question in:

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

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

Question : 1

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

Answer: (b)

Question : 2

Which one of the following does a TV remote control unit use to operate a TV set?

a) Sound waves

b) Micro waves

c) Light waves

d) Radio waves

Answer: (d)

Question : 3

An air bubble in water will act like a

a) Concave mirror

b) Convex lens

c) Convex mirror

d) Concave lens

Answer: (d)

Question : 4

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

Answer: (a)

Question : 5

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

a) Bacteria

b) Algae

c) Trees

d) Fungi

Answer: (a)

Question : 6

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

Answer: (a)

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