11th Physics Study Material Tamil Medium

11th Physics Study Material Tamil Medium. We covered all the 11th Physics Study Material Tamil Medium in this post for free so that you can practice well for the exam.

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11th Physics Mock Test for Students

If the radius of the earth contract to half of its present value, the length of the day will be :

(A) 48 hr

(B) 24 hr

(C) 12 hr

(D) 6 hr

Show Answer

The angular momentum of a body changes by 80 kg m²/s. When its angular velocity changes from 20 rad/s to 40 rad/s. The change in K.E. of rotation is :

(A) 400 J

(B) 800 J

(C) 1200 J

(D) 2400 J

Show Answer

A horizontal disc rotating freely about the vertical axis makes 90 revolutions per minute. A small piece of wax of mass m gram falls vertically on the disc and sticks to it at a distance of r cm from the axis. If the number of revolutions per minute reduces to 60 rpm, then the moment of inertia of the disc is :

(A) mr²

(B) 3/2 mr²

(C) 2 mr²

(D) 3 mr²

Show Answer

A ring of mass 10 kg and diameter 0.4 m is rotated about its axis. It makes 2100 revolutions per minute Its angular momentum will be :

(A) 88 kg m²/s

(B) 44 kg m²/s

(C) 4.4 kg m²/s

(D) 0.4 kg m²/s

Show Answer

A constant torque acting on a rotating body changes its angular momentum from Lo to 5 Lo, in the 20s, then the magnitude of torque will be :

(A) 1/5 Lo

(B) 1/10 Lo

(C) 5L0

(D) 4 Lo

Show Answer

A mass attached to a massless spring is whirled in a circular path with constant angular velocity and its angular momentum is L. If the spring is halved keeping the angular velocity the same the angular momentum is :

(A) L/4

(B) L

(C) 2L

(D) L/2

Show Answer

A homogenous disc of mass 2 kg and radius. 15 cm is rotating with an angular velocity of 4 rad/s. The linear momentum of a particle along the rim about the given axis is :

(A) 2.4 kg m/s

(B) 4 kg m/s

(C) 1.2 kg m/s

(D) Zero

Show Answer

A body of mass 2 kg and radius of gyration 0.5 m is rotating about an axis. If its angular speed is 2 rad/sec, the angular momentum of the body is :

(A) 1 kg m²/s

(B) 2 kg m²/s

(C) 3 kg m²/s

(D) 4 kg m²/s

Show Answer

A circular disc is rotating about its own axis. An external opposite torque of 0.02 Nm is applied on the disc by which it comes to rest in 5 seconds the initial angular momentum of the disc is :

(A) 0.4 kg m²/s

(B) 0.025 kg m²/s

(C) 0.10 kg m²/s

(D) 0.01 kg m²/s

Show Answer

By keeping the moment of inertia of the body constant, if we double the time period, then the angular momentum of the body :

(A) Remains constant

(B) Doubles

(C) Becomes half

(D) Quadruples

Show Answer

A 0.4 kg bead slides without friction on a wire bent into a horizontal circle of diameter 0.6 m. If a force, tangent to a circle gives the bead an angular acceleration of 4 rad/s², the rate of change of its angular momentum is :

(A) 0.144 kg m²/s

(B) 0.48 kg m²/s

(C) 0.144 Nm

(D) 0.48 Nm

Show Answer

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