set 3 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 man gets completely exhausted in trying to push a stationary wall.
Reason :
Work done by the man on the wall is zero.
(a) If Assertion is correct but Reason is incorrect.
(b) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
(c) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(d) If Assertion is incorrect but Reason is correct.
The correct answers to the above question in:
Answer: (c)
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 3) Online Quiz
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Read more mechanics work and energy Based General Science Questions and Answers
Question : 1
The energy of wind is
a) Electrical
b) Only kinetic
c) Only potential
d) Potential and kinetic both
Answer »Answer: (b)
Question : 2
Which physical quantity is represented by the ratio of momentum and velocity of the body?
a) Mass
b) Acceleration
c) Velocity
d) Force
Answer »Answer: (a)
Question : 3
A missile is launched with a velocity less than escape velocity. The sum of its kinetic and potential energies is
a) positive
b) negative
c) zero
d) may be positive, negative or zero
Answer »Answer: (b)
Question : 4
1 kilowatt hour is equal to
a) 36 joule
b) 100 joule
c) 1 joule
d) 3.6 × 103 kilo joule
Answer »Answer: (d)
Question : 5
Consider the following two statements:
- Linear momentum of a system of particles is zero.
- Kinetic energy of a system of particles is zero.
a) 1 implies 2 and 2 implies 1.
b) 1 implies 2 but 2 does not imply 1.
c) 1 does not imply 2 but 2 implies 1.
d) 1 does not imply 2 and 2 does not imply 1.
Answer »Answer: (c)
If $L↖{→}$ = 0 ⇒ K. E may or may not be zero.
If K.E = 0, $L↖{→}$ = 0
Question : 6
As the train starts moving, the head of the passenger sitting inside leans backward because of
a) Moment of Inertia
b) Inertia of Motion
c) Inertia of Rest
d) Conservation of Mass
Answer »Answer: (c)
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