12th Physics One Mark Study Material. We covered all the 12th Physics One Mark Study Material in this post for free so that you can practice well for the exam.
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12th Physics One Mark Mock Test for Students
A thin hollow cylinder is free to rotate about its geometrical axis. It has a mass of 10 kg and a radius of 0.4 m. A rope is wrapped around the cylinder. What tension must be exerted along the rope to produce an angular acceleration of 2 rad/s²?
(A) 6 N
(B) 8 N
(C) 10 N
(D) 12 N
Option b – 8 N
A circular disc of radius R and thickness R/6 has a moment of inertia I about an axis passing through its center and perpendicular to its plane. It is melted and recast into a solid sphere. The moment of inertia of the sphere about its diameter as the axis of rotation is
(A) I
(B) I/5
(C) 1/3
(D) 2I/5
Option b – I/5
Handle in the floor grinding machine is put near the circumference to :
(A) reduce friction
(B) maintain equilibrium
(C) produce more torque with the same force
(D) decorate the flooring machine
Option c – produce more torque with the same force
A solid cylinder of mass 50 kg and radius 0.5 m is free to rotate about its axis which is horizontal. A string is a wound around the cylinder with one end attached to it and the other hanging freely. The tension in the string required to produce an angular acceleration of 2 rad/s² in the cylinder is :
(A) 50 N
(B) 25 N
(C) 75 N
(D) 100 N
Option b – 25 N
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