NEET Physics: Questions 920  923 of 2098
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Question number: 920
» Laws of Motion » Laws of Friction
Question
A body of mass 800 g slides on a rough horizontal surface. If the frictional force is 6.0 N, the angle made by the contact force on the body with the vertical will be
Choices
Choice (4)  Response  

a.  27° 

b.  63° 

c.  53° 

d.  37° 

Question number: 921
» Kinematics » Average Speed and Instantaneous Velocity
Question
The rate of burning of fuel in a rocket is 60 gm/sec. and comes out with and velocity 5 x 10 ^{3} m/s. The force exerted by gas on rocket will be –
Choices
Choice (4)  Response  

a.  2.5 x l0 ^{4 } N 

b.  2.5 x l0 ^{6 } N 

c.  300 N 

d.  200 N 

Question number: 922
» Kinematics » Average Speed and Instantaneous Velocity
Question
A 30 g bullet pierces through a plate of mass m _{1} = 1 kg and then comes to rest inside a second plate of mass m _{2} = 1.5 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m1 and m _{2}. (Neglect any loss of material of the bodies, due to action of bullet. ) will be 
Choices
Choice (4)  Response  

a.  25.67% 

b.  46.45% 

c.  20.68% 

d.  39.525% 

Question number: 923
» Work, Energy and Power » Kinetic Energy
Question
Which of the following hold when two particles of masses m _{1} and m _{2} undergo elastic collision?
(1) When m, = m _{2} and m ^{2} is stationary, there is maximum transfer of kinetic energy in head on collision
(2) When m _{i} = va _{2} and m ^{2} is stationary, there is maximum transfer of momentum in head on collision
(3) When m _{l} > > m _{2} and m ^{2} is stationary, after head on collision m _{2} moves with twice the velocity of m _{1}
(4) When the collision is oblique and m _{1} = m _{2} with m _{2 } stationary, after the collision the particle move in opposite directions.
Select the correct answers and mark it according to the following codes
Choices
Choice (4)  Response  

a.  2 and 4 are correct 

b.  1 and 2 are correct 

c.  1 and 3 are correct 

d.  1, 2 and 3 are correct 
