Rotational Motion (AIIMS Physics): Questions 9  12 of 16
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Question number: 9
» Rotational Motion » Torque
Question
A force newton acts on a particle whose position vector with respect to origin O is Find the magnitude and direction of the torque.
Choices
Choice (4)  Response  

a.  Magnitude 21 Nm, direction along the negative z – axis  
b.  Magnitude 31 Nm, direction along the positive z – axis  
c.  Magnitude 21 Nm, direction along the positive z – axis  
d.  Magnitude 31 Nm, direction along the negative z – axis 
Question number: 10
» Rotational Motion » Concepts of Rotational Motion
Question
A stone of mass 5 kg is attached to a string long and is whirled in a horizontal circle. The maximum tension the string can withstand is 20 N. What maximum velocity can be given to the stone without breaking the string?
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 11
» Rotational Motion » Radius of Gyration
Question
The angular velocity of a body changes from to without applying torque but by changing moment of inertia. The ratio of initial radius of gyration to the final radius of gyration is –
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d.  2 
Question number: 12
» Rotational Motion » Rigid Body Rotation Equations of Rotational Motion
Question
A rope is wound around a hollow cylinder of and radius . If the rope is pulled with a force , the angular acceleration of cylinder and the linear acceleration of the rope are respectively –
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
