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Question-1
In a rectangle ABCD ( BC = 2AB). Through which axis the moment of inertia is minimum

(A) BC	(B)BD
(C)HF	(D)EG

Question-2 Two racing cars of masses m and 4m are moving in circles of radii r and 2r respectively. If their speeds are such that each makes a complete circle in the same time. Then the ratio of the angular speeds of the first to the second car is

(A) 8: 1	(B)4 : 1
(C)2 :1	(D)1 : 1

Question-3 A ball rolls without slipping. The radius of gyration of the ball about an axis passing through its centre of mass is k. If radius of the ball be R, then the fraction of total energy associated with its rotational energy will be

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

Question-4 A thin circular ring of mass M and radius R is rotating in a horizontal plane about an axis vertical to its plane with a constant angular velocity ω. If two objects each of mass m be attached gently to the opposite ends of a diameter of the ring, the ring will then rotate with an angular velocity

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

Question-5
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-6 A disc is rotating with angular velocity ω. If a child sits on it, what is conserved?

(A) Linear momentum	(B)Angular momentum
(C)Kinetic energy	(D)Moment of inertia

Question-7 The angular speed of an engine wheel making 90 rev/min is _________.

(A) 1.5 π rad/s	(B)3 π rad/s
(C)4.5 π rad/s	(D)6 π rad/s

Question-8
A solid cylinder of mass M and radius R rolls without slipping down an inclined plane of length L and height h. What is the speed of its centre of mass when the cylinder reaches its bottom?

(A)	(B)
(C)p>	(D)

Question-9 The ratio of the radii of gyration of a circular disc about a tangential axis in the plane of the disc and of a circular ring of the same radius about a tangential axis in the plane of the ring is

(A) 2 : 3	(B)2 : 1
(C)√5 : √6	(D)1 : √2

Question-10
O is the centre of an equilateral triangle ABC. F₁, F₂ and F₃ are three forces acting along the side AB, BC and AC as shown in figure. What should be the magnitude of F₃. So that the total torque about O is zero ?

(A) ^{( F₁ + F₂ )} /₂	(B) ( F₁ - F₂ )
(C) (F₁ + F₂ )	(D) 2 (F₁ + F₂ )

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Plus 1 Computer Science

CBSE

Practice in Related Chapters
Oscillations
Gravitation
Motion in a Straight Line
Units and Measurements
Laws of Motion
Mechanical Properties of Fluids
Mechanical Properties of Solids
Waves
Thermodynamics
Motion in a Plane
Thermal Properties of Matter
Work,Energy and Power
Kinetic Theory
System of Particles and Rotational Motion
Physical World

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