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Home » General Knowledge » Physics Mcqs » Aptitude Test - 7
1.On being displaced, the centre of mass of unstable equilibrium goes?
A. Higher
B. Neither higher nor lower
C. First higher and then lower
D. Higher
2.Which of the following stays in equilibrium even after being slightly displaced?
A. Stable equilibrium
B. Unstable equilibrium
C. Neutral equilibrium
D. Stable equilibrium
3.The flying wheel attached to the shaft of steam engine works on the principle of?
A. Centripetal action
B. Moment of inertia
C. Newton’s third law of motion
D. Centripetal action
4.A wheel of mass 8kg and radius of gyration 25cm is rotating at 300rpm. What is its moment of inertia?
A. 0.5 kgm2
B. 10 kgm2
C. 5 kgm2
D. 0.5 kgm2
5.The moment of inertia of a uniform circular disc about its diameter is 100gcm2. What is its moment of inertia about its tangent?
A. 200 gcm2
B. 100 gcm2
C. 900 gcm2
D. 200 gcm2
6.The moment of inertia of a uniform circular disc about its diameter is 100 gcm2. What is its moment of inertia about an axis perpendicular to its plane.
A. 500 gcm2
B. 100 gcm2
C. 200 gcm2
D. 500 gcm2
7.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
8.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
9.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
10.Kinetic energy with any reference must be?
A. Zero
B. Positive
C. Negative
D. Zero
11.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
12.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
13.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
14.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
15.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
16.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
17.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
18.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
19.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
20.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
21.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
22.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
23.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
24.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
25.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
26.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
27.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
28.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
29.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
30.Analogue of mass in rotational motion is?
A. Moment of inertia
B. Angular momentum
C. Gyration
D. Moment of inertia
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