Basic Concepts of Rotational Motion NEET Questions

Physics - Rotational Motion

Basic Concepts of Rotational Motion MCQ Questions


13.
Pure rotation of a rigid body about a fixed axis can be characterised by:
A.
All particles having the same linear velocity
B.
All particles having the same linear speed
C.
All parts of the body having the same angular velocity at any instant
D.
All particles having zero acceleration
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ANSWER :
C. All parts of the body having the same angular velocity at any instant
14.
The angular velocity vector ω for rotation about a fixed axis lies along:
A.
The direction of linear velocity
B.
The fixed axis of rotation
C.
The radius of circular path of any particle
D.
Perpendicular to the axis in the plane of rotation
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ANSWER :
B. The fixed axis of rotation
15.
The magnitude of the angular velocity vector ω is:
A.
v/r² where v = speed, r = radius
B.
dθ/dt
C.
v × r
D.
Δθ × Δt
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ANSWER :
B. dθ/dt
16.
For rotation about a fixed axis, the direction of the angular velocity vector ω:
A.
Changes continuously with time
B.
Does not change with time (remains along fixed axis)
C.
Rotates in a plane perpendicular to the axis
D.
Is always perpendicular to the angular momentum
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ANSWER :
B. Does not change with time (remains along fixed axis)
17.
The linear velocity of a particle of a rotating rigid body is related to angular velocity by:
A.
v = ω + r
B.
v = ω/r
C.
v = ω × r (vector relation)
D.
v = ω · r
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ANSWER :
C. v = ω × r (vector relation)
18.
For a particle at perpendicular distance rᵢ from the axis of rotation, with body rotating at angular velocity ω, the linear speed vᵢ is:
A.
vᵢ = ω/rᵢ
B.
vᵢ = ω × rᵢ (scalar: vᵢ = ωrᵢ)
C.
vᵢ = ω + rᵢ
D.
vᵢ = ω²rᵢ
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ANSWER :
B. vᵢ = ω × rᵢ (scalar: vᵢ = ωrᵢ)