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Hassan
1.Calculate the moment of inertia of the earth about its diameter, taking it to be a sphere of 1025kg and diameter 12800km.
A. 1.64 kgm2
B. 16.4×1038 kgm2
C. 1.64×1038 kgm2
D. 1.64 kgm2
2.A torque of 2×10-4 Nm is applied to produce an angular acceleration of 4rad/s2 in a rotating body. What is the moment of inertia of the body?
A. 0.5 kgm2
B. 5×104 kgm2
C. 0.5×10-4 kgm2
D. 0.5 kgm2
3.A boy carrying a box on his head is walking on a level load from one place to another on a straight road is doing no work. The statement is?
A. Correct
B. Incorrect
C. Partly correct
D. Correct
4.Kinetic energy with any reference must be?
A. Zero
B. Positive
C. Negative
D. Zero
5.The kinetic energy of a body becomes four times of its initial value, then new momentum will?
A. Become twice its initial value
B. Become thrice its initial value
C. Become four times its initial value
D. Become twice its initial value
6.The decrease in potential energy of a ball of mass 20kg, which falls from a height of 50cm, is?
A. 968J
B. 98J
C. 1980J
D. 968J
7.If the water falls from a dam into a turbine wheel 19.6m below, then the velocity of water at the turbine is? (g=9.8m/s)?
A. 9.8m/s
B. 19.6m/s
C. 39.2m/s
D. 9.8m/s
8.Two particles are seen to collide and move jointly together after the collision. During such a collision, for the total system?
A. Neither the mechanical energy nor the linear momentum is conserved
B. Mechanical energy is conserved, but not the linear momentum
C. Both the mechanical energy and the linear momentum are conserved
D. Neither the mechanical energy nor the linear momentum is conserved
9.In elastic collision, 100% energy transfer takes place when?
A. m1=2m2
B. m1 is greater than m2
C. m1 is lesser than m2
D. m1=2m2
10.When a body moves with a constant speed along a circle?
A. No work is done on it
B. No acceleration is produced in it
C. Its velocity remains constant
D. No work is done on it
11.A gun fires a bullet of mass 50g with a velocity of 30m/s. Because of this, the gun is pushed back with a velocity of 1m/s. The mass of the gun is?
A. 5.5kg
B. 3.5kg
C. 1.5kg
D. 5.5kg
12.A body of mass 5kg is raised vertically to a eight of 10m by a force of 170N. The velocity of the body at this height will be?
A. 37m/s
B. 22m/s
C. 15m/s
D. 37m/s
13.A position dependent force, F = 7-2x+3x2-N acts on a small body of mass 2kg and displaces it from x = 0 to x = 5m. The work done in joules is
A. 135
B. 270
C. 35
D. 135
14.A particle of mass M is moving in a horizontal circle of radius R with uniform speed v. When it moves from one point to a diametrically opposite point, its?
A. Kinetic energy changes by (Mv)2/4
B. Momentum does not change
C. Momentum changes by 2Mv
D. Kinetic energy changes by (Mv)2/4
15.Two identical balls A and B collide head on elastically. If velocities of A and B, before the collision are +0.5m/s and -0.3m/s respectively, then the velocities after the collision, are?
A. -0.5m/s and +0.3m/s
B. +0.5m/s and +0.3m/s
C. +0.3m/s and -0.5m/s
D. -0.5m/s and +0.3m/s
16.The kinetic energy acquires by a mass m in travelling distance d, starting from rest, under the action of a constant force is directly proportional to?
A. m
B. m0
C. √m
D. m
17.A simple pendulum hanging freely and at rest is vertical because in that position?
A. Kinetic energy is zero
B. Potential energy is zero
C. Kinetic energy is minimum
D. Kinetic energy is zero
18.A bullet is fired and gets embedded in a block kept on the table. If a table is frictionless, then?
A. Kinetic energy gets conserved
B. Potential energy gets conserved
C. Momentum gets conserved
D. Kinetic energy gets conserved
19.A ball moves in a frictionless inclined table without slipping. The work done by the table surface on the ball is?
A. Positive
B. Negative
C. Zero
D. Positive
20.A mass m is moving with a constant velocity along a line parallel to the x-axis, away from the origin. Its angular momentum with respect to the origin?
A. Is zero
B. Remains constant
C. Goes on increasing
D. Is zero
21.A particles undergoes uniform circular motion. About which point on the plane of the circle, will the angular momentum of the particles remain conserved?
A. Centre of the circle
B. On the circumference of the circle
C. Inside the circle
D. Centre of the circle
22.If the resultant of all the external forces acting on a system of particles is 0, then from an inertial frame, one can surely say that?
A. Linear momentum of the system does not change in time
B. Kinetic energy of the system does not change in time
C. Angular momentum of the system does not change in time
D. Linear momentum of the system does not change in time
23.If a person standing on a rotating disc stretches out his hands, the angular speed will?
A. Increase
B. Decrease
C. Remains same
D. Increase
24.Analogue of mass in rotational motion is?
A. Moment of inertia
B. Angular momentum
C. Gyration
D. Moment of inertia
25.Moment of inertia of an object does not depend upon?
A. Mass of object
B. Mass of distribution
C. Angular velocity
D. Mass of object
26.A flywheel has a mass of 25kg has a radius of 0.2m. What force should be applied tangentially to the rim of the flywheel so that it acquires an angular acceleration of 2rad/s2?
A. 2N
B. 5N
C. 3N
D. 2N
27.A torque of 10Nm is applied to a flywheel of mass 1kg and radius of gyration 50cm. What is the resulting angular acceleration?
A. 4 rad/s2
B. 2 rad/s2
C. 5 rad/s2
D. 4 rad/s2
28.The angular momentum of a body is 3.14 is and its rate of revolution is 10 cycles per second. Calculate the moment of inertia of the body about the axis of rotation?
A. 5 kgm2
B. 31.4 kgm2
C. 0
D. 5 kgm2
29.The angular velocity of a planet revolving in an elliptical orbit around the sun increases, when it comes closer to the sun. This is due to?
A. Conservation of momentum
B. Newton’s second law of motion
C. Conservation of angular momentum
D. Conservation of momentum
30.In a hand driven grinding machine, the handle is put?
A. Perpendicular to the stone
B. Near the circumference of the stone
C. A few distances above the stone
D. Perpendicular to the stone
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