set 1 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) Moment of inertia
(b) Angular momentum
(c) Angular velocity
(d) Rotational kinetic energy
The correct answers to the above question in:
Answer: (b)
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 1) Online Quiz
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Question : 1
Light year is
a) the distance travelled by light in free space in one year.
b) time taken by light to travel from sun to earth.
c) light emitted by the sun in one year.
d) time taken by earth to go once around the sun.
Answer »Answer: (a)
1 light year = speed of light in vacuum × no. of seconds in one year
= (3 × 108 ) × (365 × 24 × 60 × 60) = 9.467 × 1015 m.
Question : 2
The numerical ratio of average velocity to average speed is
a) always more than one
b) always equal to one
c) always less than one
d) equal to or less than one
Answer »Answer: (d)
It is equal to or less than one.
Question : 3
A spherical body moves with a uniform angular velocity (w) around a circular path of radius r. Which one of the following statements is correct?
a) The body has a radial acceleration 2/5$ω^2$r directed away from the centre of the path
b) The body has no acceleration
c) The body has a radial acceleration $ω^2$r directed toward centre of path
d) The body has an acceleration $ω^2$ tangential to its path
Answer »Answer: (c)
A body moving with a uniform angular velocity ω on a circular path of radius r has radial acceleration equal ω2r directed towards the centre of the path.
Question : 4
A boy has four options to move a body through 3m as indicated. In which case is maximum work done?
a) Push over smooth rollers
b) Lift vertically upwards
c) Push over an inclined plane
d) Push on a plane horizontal surface
Answer »Answer: (b)
Question : 5
Swimming is possible on account of
a) third law of motion
b) second law of motion
c) first law of motion
d) Newton’s law of gravitation
Answer »Answer: (a)
When the swimmer push some water in backward direction, then he get some momentum in forward direction from water & starts to swim. This is according to Newton’s third law. (action-reaction force).
Question : 6
Which of the following is not a vector quantity?
a) Force
b) Velocity
c) Displacement
d) Volume
Answer »Answer: (d)
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