1

JEE Main 2020 (Online) 2nd September Morning Slot

MCQ (Single Correct Answer)

+4

-1

A uniform cylinder of mass M and radius R is to
be pulled over a step of height a (a < R) by
applying a force F at its centre ‘O’
perpendicular to the plane through the axes of
the cylinder on the edge of the step (see
figure). The minimum value of F required is :

2

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

A spring mass system (mass m, spring
constant k and natural length $$l$$) rest in
equilibrium on a horizontal disc. The free end
of the spring is fixed at the centre of the disc.
If the disc together with spring mass system,
rotates about it's axis with an angular velocity
$$\omega $$, (k $$ \gg m{\omega ^2}$$) the relative change in the length
of the spring is best given by the option :

3

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

A rod of length L has non-uniform linear mass

density given by $$\rho $$(x) = $$a + b{\left( {{x \over L}} \right)^2}$$ , where a

and b are constants and 0 $$ \le $$ x $$ \le $$ L. The value

of x for the centre of mass of the rod is at :

density given by $$\rho $$(x) = $$a + b{\left( {{x \over L}} \right)^2}$$ , where a

and b are constants and 0 $$ \le $$ x $$ \le $$ L. The value

of x for the centre of mass of the rod is at :

4

JEE Main 2020 (Online) 9th January Evening Slot

MCQ (Single Correct Answer)

+4

-1

A uniformly thick wheel with moment of inertia
I and radius R is free to rotate about its centre
of mass (see fig). A massless string is wrapped
over its rim and two blocks of masses m

_{1}and m_{2}(m_{1}$$ > $$ m_{2}) are attached to the ends of the string. The system is released from rest. The angular speed of the wheel when m_{1}descents by a distance h is :Questions Asked from Rotational Motion (MCQ (Single Correct Answer))

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