set 1 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) our perspiration evaporates rapidly
(b) one body radiates more heat
(c) fan supplies cold air
(d) conductivity of air increase
The correct answers to the above question in:
Answer: (a)
Discuss Form
Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers
Question : 1
Photosynthesis using the invisible part of the Sunlight is done by some
a) Bacteria
b) Algae
c) Trees
d) Fungi
Answer »Answer: (a)
Question : 2
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 »Answer: (a)
Question : 3
Consider the following statements for a simple harmonic motion:
- The magnitude of the velocity of the body is proportional to its displacement from the mean position.
- The magnitude of the acceleration of the body is proportional to its displacement from the mean position.
- The sum of the kinetic energy and potential energy of the body is always constant.
a) 3 only
b) 1 and 3
c) 2 and 3
d) 2 only
Answer »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 : 4
Strips of two metals A and B are firmly jointed together as shown in the figure. On heating, A expands more than B does. If this jointed strip is heated, then it will appear as
a)
b)
c)
d)
Answer »Answer: (a)
Question : 5
Sound waves do not travel in
a) Liquids
b) Gases
c) Solids
d) Vacuum
Answer »Answer: (d)
Question : 6
The number of images of an object placed between two parallel mirrors is
a) Six
b) One
c) Two
d) Infinite
Answer »Answer: (d)
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