set 4 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 5 EXERCISES
The following question based on mechanics (mass, force, acceleration, work, energy, momentum, velocity) topic of general science mcq
(a) 5 : 2
(b) 2 : 1
(c) 6 : 4
(d) 4 : 3
The correct answers to the above question in:
Answer: (b)
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 4) Online Quiz
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Read more mechanics work and energy Based General Science Questions and Answers
Question : 1
A cannon after firing recoils due to
a) Newton’s third law of motion
b) backward thrust of gases produced
c) conservation of energy
d) Newton’s first law of motion
Answer »Answer: (a)
Question : 2
Time period of a simple pendulum inside a satellite orbiting earth is
a) T
b) ∞
c) zero
d) 2 T
Answer »Answer: (b)
Since, T = $2π√{l/g}$
but inside the satellite g = 0
So, T = ∞
Question : 3
ML2T –2 are dimensions of
a) momentum
b) moment of force
c) force
d) power
Answer »Answer: (b)
Moment of force = r × F = [L] [MLT–2] = [ML2T–2]
Question : 4
A rubber ball dropped from 24 m height loses its kinetic energy by 25%. What is the height to which it rebounds.
a) 18 m
b) 12 m
c) 6 m
d) 24 m
Answer »Answer: (a)
Question : 5
A body weighs less at the equator than at the poles because:
- earth rotates about its axis.
- the ice cap at the poles increases gravitational pull.
- equatorial diameter is greater than the polar diameter.
- of some unknown facts.
a) 1 and 3
b) 1 and 2
c) 3 only
d) 4 only
Answer »Answer: (d)
For a given point on the surface of the earth, g decreases as w increases.
Hence, the body weighs less at the equator than at the poles also equatorial diameter is greater than the polar diameter.
So according to g = ${GM}/{R^2}$ value of g decreases.
Question : 6
When an incandescent electric bulb glows
a) the light energy is converted into electric energy
b) the electric energy is partly converted into light energy and partly into heat energy
c) the electric energy is completely converted into light
d) the electric energy is converted into magnetic energy
Answer »Answer: (b)
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