System of Particles and Rotational Motion MCQ Questions Class 11 Physics Chapter 7
NCERT MCQ Questions for Class 11 Physics Chapter 7 System of Particles and Rotational Motion. System of Particles and Rotational Motion MCQ Questions with Answers from Class 11 Physics.
System of Particles and Rotational Motion MCQ Questions Class 11 Physics Chapter 7
System of Particles and Rotational Motion Multiple Choice Questions with Answers Class 11 Physics Chapter 7 PDF is available.
1) An ideal rigid body is the body with a
a) Imperfect shape
b) Perfectly definite and unchanging shape
c) Both a and b
d) None
Ans: b) perfectly definite and unchanging shape
2) In case of rigid body the distance between all pairs of particles of such body
a) Changes
b) Do not changes
c) Both a and b
d) None
Ans: b) do not changes
3) In pure translational motion at any instant of time, all particles of the body have
a) Different velocity
b) Changing velocity
c) Same velocity
d) None
Ans: c) same velocity
4) The line or fixed axis about which the body is rotating is called as
a) Axis
b) Axis of rotation
c) Rotational pole
d) None
Ans: b) axis of rotation
5) The point at which whole mass of body is supposed to be concentrated is called as
a) Centre of gravity
b) Centre of mass
c) Both a and b
d) None
Ans: b) centre of mass
6) The total momentum of the system of particle is equal to the product of the total mass of the system and the
a) Velocity
b) Acceleration
c) Velocity of its centre of mass
d) None
Ans: c) velocity of its centre of mass
7) When the total external force acting on the system of particles is zero then the total
a) Angular momentum of the system is constant
b) Linear momentum of the system is constant
c) Both a and b
d) None
Ans: b) linear momentum of the system is constant
8) When the external force on the system is zero then ______ remains constant.
a) Velocity of body
b) Velocity of centre of mass
c) Both a and b
d) None
Ans: b) velocity of centre of mass
9) The magnitude of vector product of vectors A and B is given by
a) |A×B | = AB sinx
b) |A×B| = AB Cosx
c) Both a and b
d) None
Ans: a) |A×B| = AB Sinx
10) For the vector product, C = A×B
a) C is perpendicular to the plane containing A and B
b) C is parallel to the plane containing A and B
c) Both a and b
d) None
Ans: a) C is perpendicular to the plane containing A and B
11) The vector product is
a) Commutative
b) Not commutative
c) Both a and b
d) None
Ans: b) not commutative
12) The vector product A× B =
a) B×A
b) – (B × A)
c) Both a and b
d) None
Ans: b) – ( B × A)
13) Scalar and vector product are distributive with respect
a) Vector multiplication
b) Vector addition
c) Vector subtraction
d) None
Ans: b) vector addition
14) A × A =
a) 1
b) 0
c) Both a and b
d) None
Ans: b) 0
15) For unit vector i, j and k
a) i×i = j×j = k×k = 0
b) i × j = k
c) Both a and b
d) None
Ans: c) both a and b
16) Velocity in terms of vector product is given by
a) V = w•r
b) V = w × r
c) V = RW
d) None
Ans: b) v = w × r
17) The angular acceleration in terms of angular velocity is given by
a) dw/dt
b) dv/dt
c) -dw/dt
d) None
Ans: a) dw/dt
18) The rotational analogue of force in linear motion is
a) Moment of force
b) Torque
c) Couple
d) All
Ans: d) all
19) The time rate of the total angular momentum of a system of particles about a point is equal to ______ acting on the system taken about the point.
a) Sum of external force
b) Sum of external momentum
c) Sum of external torques
d) None
Ans: c) sum of external torques
20) If the total external torque on a system of particles is zero then
a) Total linear momentum of the system is conserved
b) Total angular momentum of the system is conserved
c) Both a and b
d) None
Ans: b) total angular momentum of the system is conserved
- In case you have missed:- Previous Chapter MCQ Questions
21) If dL/dt = 0 then
a) P is constant
b) L is constant
c) F is constant
d) W is constant
Ans: b) L is constant
22) A rigid body is said to be in mechanical equilibrium if both _______ are not changing with time.
a) Linear momentum
b) Angular momentum
c) Both a and b
d) None
Ans: c) both a and b
23) If the total force on the body is zero then the total _______ of the body does not change with _____.
a) Angular momentum, time
b) Linear momentum, time
c) Both a and b
d) None
Ans: b) linear momentum, time
24) If the total torque on the rigid body is zero then the total ______ of the body does not change with ____.
a) Linear momentum, time
b) Angular momentum, time
c) Both a and b
d) None
Ans: b) angular momentum, time
25) The sum of the components of the torque along any axis perpendicular to the plane of the forces must be
a) Unity
b) Zero
c) Both a and b
d) None
Ans: b) zero
26) A pair of forces of equal magnitude but acting opposite directions with different lines of actions is known as
a) Couple
b) Torque
c) Both a and b
d) None
Ans: c) both a and b
27) The kinetic energy of the rotating body is given by
a) 1/2mv2
b) 1/2Iw2
c) 1/2Iw
d) Is
Ans: b) 1/2Iw2
28) The moment of inertia of the body is given by
a) I = MR2
b) I = Mr
c) Both a and b
d) None
Ans: a) I = MR2
29) The distance of axis of rotation front eh centre of mass of the body is called as
a) Radius of rotation
b) Radius of curvature
c) Radius of gyration
d) None
Ans: c) radius of gyration
30) The moment of inertia about the axis perpendicular to the plane of thin circular ring of radius R is given by
a) MR2
b) MR2/2
c) MR/2
d) M2R
Ans: a) MR2
31) The moment of inertia about the diameter of the thin circular ring of radius R is given by
a) MR2
b) MR
c) MR2/2
d) None
Ans: c) MR2/2
32) The moment of inertia about the axis which is perpendicular to the thin rod of length L at its mid point is given by
a) ML/12
b) ML
c) ML2/12
d) None
Ans: c) ML2/12
33) The moment of inertia about the axis perpendicular to disc at centre of circular disc of radius R is given by
a) MR/2
b) MR
c) MR2/2
d) None
Ans: c) MR2/2
34) The moment of inertia about the axis of hollow cylinder of radius R is given by
a) MR
b) MR2
c) MR2/2
d) None
Ans: b) MR2
35) The moment of inertia about the axis of solid cylinder of radius R is given by
a) MR2/2
b) MR2
c) MR/2
d) None
Ans: a) MR2/2
36) The moment of inertia about the diameter of solid sphere of radius R is given by
a) MR2
b) 2/5*(MR2)
c) 2/5*(MR)
d) None
Ans: b) 2/5*(MR2)
37) According to theorem of perpendicular axis
a) Iz = Ix –Iy
b) Iz = Ix + Iy
c) Both. A and b
d) None
Ans: b) Iz = Ix + Iy
38) According to Parallel axes theorem
a) Iz = Iy – Ma2
b) Iz = Iy + Ma2
c) Both a and b
d) None
Ans: b) Iz = Iy + Ma2
39) Angular momentum is given by
a) P = mv
b) L = Iw
c) L = Iw2
d) None
Ans: b) L = Iw
40) Angular momentum is the
a) Scalar quantity
b) Vector quantity
c) Both a and b
d) None
Ans: b) vector quantity
- In case you have missed:- Next Chapter MCQ Questions