NEET Physics: Questions 301  305 of 2142
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Question number: 301
» Rotational Motion » Angular Momentum
Question
Two rigid bodies A and B rotate with rotational kinetic energies E _{A} and E _{B} respectively. The moments of inertia of A and B about the axis of rotation are I _{A} and I _{B} respectively. If I _{A} = I _{B} /4 and E _{A} = 100 E _{B}, the ratio of angular momentum (L _{A}) of A to the angular momentum (L _{B}) of B is
Choices
Choice (4)  Response  

a.  5 

b.  25 

c.  0.25


d.  1.25 

Question number: 302
Question
Find the torque of a force F =2 i + j+3 k acting at the point r = 5 i + 3 j + 2k
Choices
Choice (4)  Response  

a.  14i  38j + 16k 

b.  l4i + 38j 16k 

c.  21i + 3j + 5k 

d.  7i  19j + 19k 

Question number: 303
» Rotational Motion » Angular Momentum
Question
The wheel of a car is rotating at the rate of 1200 revolutions per minute. On pressing the accelerator for 10 seconds, it starts rotating at 3500 revolutions per minute. The angular acceleration of the wheel is
Choices
Choice (4)  Response  

a.  1880 degree/sec ^{2} 

b.  1500 rad/sec ^{2} 

c.  30 rad/sec ^{2} 

d.  1980 degree/sec ^{2} 

Passage
An electric dipole (AB) consisting of two particles of equal and opposite charge and same mass is released in an electric field. In the figure field lines are without considering effect of field of dipole.
Question number: 304 (1 of 2 Based on Passage) Show Passage
» Electrostatics » Electric Dipole
Question
The center of mass of the dipole
Choices
Choice (4)  Response  

a.  Has acceleration with positive x and y components 

b.  Has no acceleration 

c.  Has acceleration with negative x component and positive y component 

d.  Has acceleration with positive x component and negative y component 

Question number: 305 (2 of 2 Based on Passage) Show Passage
» Electrostatics » Electric Dipole
Question
Angular acceleration of the dipole, immediately after it is released
Choices
Choice (4)  Response  

a.  is anticlockwise 

b.  is clockwise 

c.  Cannot be determined from the given information. 

d.  is zero 
