Rotational Motion (NEET Physics): Questions 68  70 of 125
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Question number: 68
» Rotational Motion » Moment of Inertia
Question
One quarter section is cut from a uniform circular disc of radius R. This section has mass M. It is made to rotate about a line perpendicular to its plane and passing through the centre of the original disc. Its moment of inertia about the axis of rotation is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 69
» 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: 70
» 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} 
