NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics: Questions 921  923 of 2142
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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 
