Physics 2011

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Q. 6.  The instantaneous angular position of a point on a rotating wheel is given by the equation The torque on the wheel becomes zero at

(1) t = 2 s                                                          (2) t = 1 s

(3) t = 0.2 s                                                       (4) t = 0.25 s

Sol:

Answer : (2)

 

Q. 7.  A particle moves in a circle of radius 5 cm with constant speed and time period 0.2 π s. The acceleration of the particle is

(1) 5 m/s2                                                          (2) 15 m/s2

(3) 25 m/s2                                                       (4) 36 m/s2

Sol:   

Answer : (1)

 

Q.8. A body of mass M hits normally a rigid wall with velocity V and bounces back with the same velocity. The Impulse experienced by the body is

(1) Zero                                                             (2) MV

(3) 1.5 MV                                                         (4) 2 MV

 

Sol.   

Impulse = MV – (– MV) = 2 MV

Answer: (4)

 

Q.9 . A planet moving along an elliptical orbit is closest to the sun at a distance r1 and farthest away at a distance of r2. If v1 and v2 are the linear velocities at these points respectively. Then the ratio v1/ v2

Sol.

   

Answer (3)

 

Q.10. A radioactive nucleus of mass M emits a photon of frequency n and the nucleus recoils. The recoil energy will be

Sol.

Answer (3)

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