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) 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
The correct answers to the above question in:
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.
Practice mechanics (mass, force, acceleration, work, energy, momentum, velocity) (set 1) Online Quiz
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Read more mechanics work and energy Based General Science Questions and Answers
Question : 1
A jet engine works on the principle of conservation of
a) energy
b) angular momentum
c) linear momentum
d) mass
Answer »Answer: (c)
Question : 2
A vector quantity is a physical quantity which needs
a) magnitude
b) direction
c) both (a) and (b)
d) time
Answer »Answer: (b)
A physical quantity which can be specified completely by giving a single number and the appropriate unit alongside it is known as a scalar quantity. Scalar quantities that have the same physical units can be added or subtracted according to the strict mathematical rules of algebra for numbers.
There are a lot of physical quantities which cannot be described by just a single number of physical units. For example in order to fetch a ball which is thrown it is not only important to know the speed with which it is thrown but also the direction in which it is thrown so that it is easier to locate the ball. Physical quantities which are specified completely by giving a number of units (magnitude) and a direction alongside it are known as vector quantities.
Thus we see that a vector quantity has both magnitude and direction.
Thus, we see that the correct answer to this question is (B).
Question : 3
The variation of displacement d with time t in the case of a particle falling freely under gravity from rest is correctly shown in graph:
a)
b)
c)
d)
Answer »Answer: (c)
Graph (c) here represents the variation of displacement with time in case of particle falling freely under the effect of gravity.
Question : 4
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 : 5
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 : 6
A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected ?
a) Moment of inertia
b) Angular momentum
c) Angular velocity
d) Rotational kinetic energy
Answer »Answer: (b)
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