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Question-1 A weightless ladder 20 ft long rests against a frictionless wall at an angle of 60^o from the horizontal. A 150 pound man is 4 ft from the top of the ladder . A horizontal force needed to keep it form slipping. Choose the correct magnitude of force from the following.?

(A) 17.3 pound	(B)100 pound
(C)120 pound	(D)150 pound

Question-2 A flywheel rotating about a fixed axis has a kinetic energy of 360J when its angular speed is 30 rad/s. The moment of inertia of the wheel about the axis of rotation is _______.

(A) 0.6 kgm²	(B)0.15 kgm²
(C)0.8 kgm²	(D)0.75 kgm²

Question-3 A solid homogenous sphere of mass M and radius R is moving on a rough horizontal surface, party rolling and party sliding during this kind of motion of the sphere ?

(A) Total Kinetic energy is conserved	(B)The angular momentum of the sphere about the point of contact with the plane is conserved
(C)Only the rotational kinetic energy about the centre of mass is conserved	(D)Angular momentum about the centre of mass is conserved

Question-4 A solid sphere, disc and solid cylinder, all of the same mass and made of same material are allowed to roll down ( from rest ) on the inclined plane, then :

(A) Solid sphere reaches the bottom first	(B)Solid sphere reaches the bottom last
(C)Disc will reach the bottom first	(D)All reach the bottom at the same time

Question-5
If is the force acting on a particle having position vector and be the torque of this force about the origin, then

(A)	(B)
(C)	(D)

Question-6 The moment of inertia of a disc of mass M and radius R about a tangent to its rim in its plane is

(A) ²/₃ MR²	(B)³/₂ MR²
(C)⁴/₅ MR²	(D)⁵/₄ MR²

Question-7 A ring of mass m and radius r rotates about an axis passing through its center and perpendicular to its plane with angular velocity on its kinetic energy is _______

(A) ¹/₂ mr² ω²	(B) mrω²
(C)mr²ω²	(D) ¹/₂ mrω²

Question-8
ABC is a triangular plate of uniform thickness. The sides are in the ratio shown in the figure. I _AB – I _BC and I _CA are the moments of inertia of the plate about AB, BC and CA as axes respectively. Which one of the following relations is correct ?

(A) I _AB > I_BC	(B) I_BC > I _AC
(C) I _AB + I _BC = I_CA	(D) I _CA is maximum

Question-9 Moment of inertia of a uniform circular disc about a diameter is I. Its moment of inertia about an axis perpendicular to its plane and passing through a point on its rim will be

(A) 51	(B)31
(C)61	(D)41

Question-10
The angular momentum of a body with mass ( m) moment of inertia ( I ) and angular velocity ( ω ) rad/s is equal to ____.

(A) I_ω	(B) I_ω2
(C) ^I/_ω2	(D) ^I/_ω

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Plus 1 Computer Science

CBSE

Practice in Related Chapters
Oscillations
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Thermal Properties of Matter
Work,Energy and Power
Kinetic Theory
System of Particles and Rotational Motion
Physical World

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