Rotational Motion (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 41  45 of 125
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Question number: 41
» Rotational Motion » Angular Momentum
Assertion (Ꭺ)
Torque is equal to rate of change of angular momentum.
Reason (Ꭱ)
Angular momentum depends on moment of inertia and angular velocity.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

b.  Ꭺ is false but Ꭱ is true 

c.  Both Ꭺ and Ꭱ are false 

d.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

Question number: 42
» Rotational Motion » Angular Momentum
Question
In a bicycle, the radius of rear wheel is twice the radius of front wheel. If r _{F} and r _{r} are the radius, v _{p} and v _{r} are speeds of top most points of wheel, then
Choices
Choice (4)  Response  

a.  v _{r} = 2v _{F} 

b.  v _{F} = v _{r} 

c.  v _{F} = 2v _{r} 

d.  v _{F } > v _{r} 

Question number: 43
» Rotational Motion » Values of Moments of Inertia
Question
A flywheel rotating about a fixed axis has a kinetic energy of 380 J, when its angular speed is 35 rad s ^{1}. The moment of inertia of the wheel about the axis of rotation is,
Choices
Choice (4)  Response  

a.  0.8 kg m ^{2 } 

b.  0.75 kg m ^{2 } 

c.  0.15 kg m ^{2 } 

d.  0.62 kg m ^{2} 

Question number: 44
» Rotational Motion » Values of Moments of Inertia
Question
A cylinder of 500 g and radius 10 cm has moment of inertia (about its natural axis)
Choices
Choice (4)  Response  

a.  2.5 ⨯ 10 ^{3} kgm ^{2} 

b.  2 ⨯ 10 ^{3} kgm ^{2} 

c.  3.5 ⨯ 10 ^{3} kgm ^{2} 

d.  5 ⨯ 10 ^{3} kgm ^{2} 

Question number: 45
» Rotational Motion » Values of Moments of Inertia
Question
Three particles of mass 1.5 kg are attached to the rim of a circular disc of radius 0.2 m & negligible mass. Moment of inertia of die system about an axis passing through the center of the disc & perpendicular to its plane is
Choices
Choice (4)  Response  

a.  2.2 kgm ^{2} 

b.  0.18 kgm ^{2} 

c.  l kgm ^{2} 

d.  0.24 kgm ^{2 } 
