set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

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

Question : 2

Two teams are pulling a rope with equal and opposite forces each of 5 kN in a tug of war so that a condition of equilibrium exists. What will be the tensile force in the rope?

a) 5 kN

b) 2.5 kN

c) Zero

d) 10 kN

Question : 3

Which one among the following is correct for resultant of balanced forces?

a) It varies continuously

b) It is non-zero

c) It is zero

d) None of the above

Question : 4

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

Question : 5

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 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

Question : 6

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