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 a radial acceleration $ω^2$r directed toward centre of path
(c) The body has no acceleration
(d) The body has an acceleration $ω^2$ tangential to its path
The correct answers to the above question in:
Answer: (b)
Option (b) is the correct answer.
A body moving with a uniform angular velocity ω on a circular path of radius r has radial acceleration equal $ω^2$r 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
In which of the following examples, work done is negative?
a) Work done by the force of gravity on a freely falling object
b) Work done by the force of gravity on a ball thrown upwards
c) Work done by the force of gravity on a moving aeroplane
d) Work done by the force of gravity on a satellite revolving around the earth
Answer »Answer: (b)
Question : 2
Statement A :
While drawing a line on a paper, friction force acts on paper in the same direction along which line is drawn on the paper.
Statement B :
Friction always opposes motion.
a) Both statements are correct.
b) Statement B is correct.
c) Statement A is correct.
d) Both statements are incorrect.
Answer »Question : 3
A person sitting on a chair in a satellite feels weightless because
a) the normal force is zero
b) the normal force by the chair on the person balances the earth’s attraction
c) the earth does not attract the objects in a satellite
d) the person in satellite is not accelerated
Answer »Answer: (a)
The weightlessness inside a satellite is due to the fact that the surface does not exert any force on the body and hence its apparent weight is zero.
Question : 4
A couple is acting on a two particle systems. The resultant motion will be
a) both a and b
b) purely linear motion
c) purely rotational motion
d) neither of a and b
Answer »Answer: (c)
Question : 5
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 : 6
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).
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