CBSE Class 11 Physics Chapter 7 System of Particles and Rotational Motion Multiple Choice Questions with Answers. MCQ Questions Class 11 Physics System of Particles and Rotational Motion with Answers was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 11 Physics System of Particles and Rotational Motion MCQs with Answers to know their preparation level.
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MCQ Questions Class 11 Physics System of Particles and Rotational Motion with Answers - Set - 4
Question 1:
A circular disc is to be made by using iron and aluminium so that it acquires maximum moment of inertia about geometrical axis. It is possible with
(a) aluminium at interior and iron surrounding it
(b) iron at interior and aluminium surrounding it
(c) using iron and aluminium layers in alternate order
(d) sheet of iron is used at both external surface and aluminium sheet as internal layers.
Correct Answer – (A)
Question 2 :
The ratio of the radii of gyration of a circular disc to that of a circular ring, each of same mass and radius, around their respective axes is
(a) √2 :1
(b) 2 : 3
(c) 3 : 2
(d) 1: 2
Correct Answer – (D)
Question 3 :
A solid sphere of mass m and radius R is rotating about its diameter. A solid cylinder of the same mass and same radius is also rotating about its geometrical axis with an angular speed twice that of the sphere. The ratio of their kinetic energies of rotation (Esphere/Ecylinder) will be
(a) 2 : 3
(b) 1 : 5
(c) 1 : 4
(d) 3 : 1
Correct Answer – (B)
Question 4 :
250 N force is required to raise 75 kg mass from a pulley. If rope is pulled 12 m then the load is lifted to 3 m, the efficiency of pulley system will be
(a) 25%
(b) 33.3%
(c) 75%
(d) 90%.
Correct Answer – (C)
Question 5 :
(1) Centre of gravity (C.G.) of a body is the point at which the weight of the body acts.
(2) Centre of mass coincides with the centre of gravity if the earth is assumed to have infinitely large radius.
(3) To evaluate the gravitational field intensity due to any body at an external point, the entire mass of the body can be considered to be concentrated at its C.G.
(4) The radius of gyration of any body rotating about an axis is the length of the perpendicular drawn from the C.G. of the body to the axis. Which one of the following pairs of statements is correct?
(a) (4) and (1)
(b) (1) and (2)
(c) (2) and (3)
(d) (3) and (4)
Correct Answer – (A)
MCQ Questions Class 11 Physics System of Particles and Rotational Motion with Answers
Question 6 :
Two bodies have their moments of inertia I and 2I respectively about their axis of rotation. If their kinetic energies of rotation are equal, their angular velocity will be in the ratio
(a) 2 : 1
(b) 1 : 2
(c) 2 : 1
(d) 1 : 2
Correct Answer – (C)
Question 7 :
From a circular disc of radius R and mass 9M, a small disc of mass M and radius R/3 is removed concentrically. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through its centre is
(a) 40/9 MR2
(b) MR2
(c) 4MR2
(d) 4/9 MR2
Correct Answer – (A)
Question 8 :
A couple produces
(a) linear and rotational motion
(b) no motion
(c) purely linear motion
(d) purely rotational motion.
Correct Answer – (D)
Question 9 :
A rod of length 3 m and its mass per unit length is directly proportional to distance x from one of its end then its centre of gravity from that end will be at
(a) 1.5 m
(b) 2 m
(c) 2.5 m
(d) 3.0 m
Correct Answer – (B)
Question 10 :
Which of the following statements are correct?
(1) Centre of mass of a body always coincides with the centre of gravity of the body.
(2) Centre of mass of a body is the point at which the total gravitational torque on the body is zero.
(3) A couple on a body produces both translational and rotational motion in a body.
(4) Mechanical advantage greater than one means that small effort can be used to lift a large load.
(a) (1) and (2)
(b) (2) and (3)
(c) (3) and (4)
(d) (2) and (4)
Correct Answer – (C)
- NCERT Solutions Class 11 Physics Chapter 1 : Physical world
- NCERT Solutions Class 11 Physics Chapter 2 : Units And Measurements
- NCERT Solutions Class 11 Physics Chapter 3 : Motion In A Straight Line
- NCERT Solutions Class 11 Physics Chapter 4 : Motion In A Plane
- NCERT Solutions Class 11 Physics Chapter 5 : Laws of Motion
- NCERT Solutions Class 11 Physics Chapter 6 : Work Energy Power
- NCERT Solutions Class 11 Physics Chapter 7 : Rotational-Motion
- NCERT Solutions Class 11 Physics Chapter 8 : Gravitation
- NCERT Solutions Class 11 Physics Chapter 9 : Mechanical Properties of Solids
- NCERT Solutions Class 11 Physics Chapter 10 : Mechanical Properties of Fluids
- NCERT Solutions Class 11 Physics Chapter 11 : Thermal Properties of Matter
- NCERT Solutions Class 11 Physics Chapter 12 : Thermodynamics
- NCERT Solutions Class 11 Physics Chapter 13 : Kinetic Theory
- NCERT Solutions Class 11 Physics Chapter 14 : Oscillations
- NCERT Solutions Class 11 Physics Chapter 15 : Waves
