Rotational Motion (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 80  84 of 125
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Question number: 80
» Rotational Motion » Moment of Inertia
Question
From a disc of radius R, a concentric circular portion of radius r is cut out so as to leave an annular disc of mass M. The moment of inertia of this annular disc about the axis perpendicular to its plane and passing through its center of gravity is,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 81
» Rotational Motion » Moment of Inertia
Question
One circular ring and one circular disc, both are having the same mass and radius. The ratio of their moments of inertia about the axes passing through their centers and perpendicular to their planes, will be
Choices
Choice (4)  Response  

a.  1: 1 

b.  1: 2 

c.  2: 1 

d.  4: 1 

Question number: 82
» Rotational Motion » Concepts of Rotational Motion
Question
A solid sphere, disc and solid cylinder all of the same mass and made up of same material are allowed to roll down (from rest) on an inclined plane, then
Choices
Choice (4)  Response  

a.  Solid sphere reaches the bottom late 

b.  Disc will reach the bottom first 

c.  All of team reach the bottom at the same time 

d.  Solid sphere reaches the bottom first 

Question number: 83
» Rotational Motion » Values of Moments of Inertia
Question
A long rod has a mass of 5 kg and length 2 m. The moment of inertia about an axis passing through the center and perpendicular to the length of rod will be
Choices
Choice (4)  Response  

a.  0.01 kgm ^{2} 

b.  1.66 kgm ^{2} 

c.  0.008 kgm ^{2} 

d.  0.001 kgm ^{2} 

Question number: 84
» Rotational Motion » Conservation of Angular Momentum
Question
A cord is wound round the circumference of wheel of radius r. The axis of the wheel is horizontal and moment of inertia about it is I. A weight mg is attached to the end of the cord and falls from the rest. After falling through a distance h the angular velocity of the wheel will be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

