Rotational Motion (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 117  120 of 125
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Question number: 117
» Rotational Motion » Values of Moments of Inertia
Question
Moment of inertia of a ring of mass m = 10 gm and radius r = 5 cm about an axis passing through its edge and parallel to its natural axis is
Choices
Choice (4)  Response  

a.  8 gmcm ^{2} 

b.  500 gmcm ^{2} 

c.  10 gmcm ^{2} 

d.  1 gmcm ^{2} 

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Question number: 118
» Rotational Motion » Moment of Inertia
Question
Moment of inertia of a disc about its own axis is 6I its moment of inertia about a tangential axis in its plane is
Choices
Choice (4)  Response  

a. 


b.  12 I 

c. 


d. 


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Question number: 119
» Rotational Motion » Concepts of Rotational Motion
Assertion (Ꭺ)
Two cylinders, one hollow (metal) and the other solid (wood) with the same mass and identical dimensions are simultaneously allowed to roll without slipping down an inclined plane from the same height. The hollow cylinder will reach the bottom of the inclined plane first.
Reason (Ꭱ)
By the principle of conservation of energy. The total kinetic energies of both the cylinders are identical when they reach the bottom of the incline.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are false 

b.  Ꭺ is true but Ꭱ is false 

c.  Ꭺ is false but Ꭱ is true 

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

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Question number: 120
» Rotational Motion » Frequency and Period
Question
A solid cylinder of mass M and radius R rolls without slipping down an inclined plane of length l and height h. Find the time it takes to reach at bottom.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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