set 2 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 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.
(a) A is true but R is false
(b) Both A and R are true but R is not a 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
The correct answers to the above question in:
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 2) Online Quiz
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Read more mechanics work and energy Based General Science Questions and Answers
Question : 1
A gymnast takes turns with her arms & legs stretched. When she pulls her arms and legs
a) the angular velocity stays constant
b) the moment of inertia decreases
c) the angular velocity decreases
d) the angular momentum increases
Answer »Answer: (b)
Question : 2
Kepler’s second law (law of area) is nothing but a statement of
a) conservation of angular momentum
b) conservation of linear momentum
c) work energy theorem
d) conservation of energy
Answer »Answer: (a)
From Kepler's $2^{nd}$ law – The straight line joining the sun and the planet sweeps out equal areas in equal time intervals (${dA}/{dt}$ = const; area swept)
Areal velocity of the satellite is given by
${dA}/{dt}=1/2ωr^2 = const. = L/{2m}$
where ω = angular velocity of the satellite
L = mvr = mω$r^2$ = const, showing that Kepler's $2^nd$ law is a consequence of the conservation of angular momentum.
Question : 3
The working principle of a washing machine is
a) Reverse osmosis
b) Dialysis
c) Centrifugation
d) Diffusion
Answer »Answer: (c)
Question : 4
The force exerted by the floor of an elevator on the foot of a person standing there, is more than his weight, if the elevator is
a) going up and slowing down
b) going up and speeding up
c) going down and slowing down
d) either (a) or (b)
Answer »Answer: (b)
Question : 5
Force is the product of
a) Weight and velocity
b) Mass and acceleration
c) Mass and velocity
d) Weight and acceleration
Answer »Answer: (b)
Question : 6
A man jumped at a speed of 5 metre per second from a stationary boat and the boat moved off with the speed of 0.5 metre per second. How many times is the mass of the boat greater than that of the man?
a) 2.5 times
b) 4.5 times
c) 5.5 times
d) 10 times
Answer »Answer: (d)
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