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) T
(b) ∞
(c) zero
(d) 2 T
The correct answers to the above question in:
Answer: (b)
Since, T = $2π√{l/g}$
but inside the satellite g = 0
So, T = ∞
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
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 : 2
For a given mass and size, moment of inertia of a solid disc is
a) equal to that of a ring
b) less than that of a ring
c) more than that of a ring
d) depend on the material of ring and disc
Answer »Answer: (b)
Question : 3
Assertion (A):
A man standing on a completely frictionless surface can propel himself by whistling.
Reason (R):
If no external force acts on a system, its momentum cannot change.
Code
a) (A) is true, but (R) is false
b) Both (A) and (R) are true, but (R) is not the correct explanation of (A)
c) Both (A) and (R) are true and (R) is the correct explanation of (A)
d) (A) is false, but (R) is true
Answer »Answer: (b)
Question : 4
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 : 5
Two persons do the same amount of work, one in 10 s and the other in 20 s. Find the ratio of the power used by the first person to that by the second person.
a) 5 : 2
b) 2 : 1
c) 6 : 4
d) 4 : 3
Answer »Answer: (b)
Question : 6
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)
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