NEET Physics: Questions 1990  1992 of 2142
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Question number: 1990
» Rotational Motion » Moment of Inertia
Question
The moment of inertia of a thin square plate ABCD of uniform thickness about an axis passing through the centre O and perpendicular to the plane of the plate is
(1)
(2)
(3)
(4)
where I _{1}, I _{2, } I _{3} are respectively moments of inertia about axes 1, 2, 3 and 4 which are in the plane of the plate.
Select the correct answers and mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1, 2 and 3 are correct 

b.  1 and 3 are correct 

c.  1 and 2 are correct 

d.  2 and 4 are correct 

Question number: 1991
» Rotational Motion » Values of Moments of Inertia
Question
A constant torque of 62.8 Nm is exerted on a pivoted wheel. If angular acceleration of wheel is 5π rad/sec ^{2}, then the moment of inertia of the wheel is
Choices
Choice (4)  Response  

a.  3 kgm ^{2} 

b.  3.5 kgm ^{2} 

c.  4 kgm ^{2} 

d.  4.5 kgm ^{2} 

Question number: 1992
» Rotational Motion » Moment of Inertia
Assertion (Ꭺ)
If earth shrink (without change in mass) to half of its present size, length of the day would become 6 % increase.
Reason (Ꭱ)
When the size of the earth will change, its moment of inertia will also change.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are false 

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

c.  Ꭺ is true but Ꭱ is false 

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