Work, Energy and Power (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 22  26 of 63
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Question number: 22
» Work, Energy and Power » Kinetic Energy
Question
A body of mass M splits into two parts αM and (1  a) M by an internal explosion, which generates kinetic energy T After explosion if the two parts move in the same direction as before, their relative speed will be –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 23
» Work, Energy and Power » Work Done
Question
A particle moving in a straight line is acted by a force, which works at a constant rate and changes its velocity from u to v in passing over a distance x. The time taken will be –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 24
» Work, Energy and Power » Potential Energy
Question
A tennis ball dropped from a height of 5 m rebounds only 2.5 f meter after hitting the ground. What fraction of energy is lost in the impact?
Choices
Choice (4)  Response  

a.  1.26 

b.  0.466 

c.  0.5 

d.  2.45 

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Question number: 25
» Work, Energy and Power » Power
Question
A bus of mass 2000 kg has an engine which produces a constant power of 50 kW. If the resistance to motion, assumed constant is 2000 N. The maximum speed at which the bus can travel on level road and the acceleration when it is travelling at 15 m/s, will respectively be –
Choices
Choice (4)  Response  

a.  10 m/s, 5m/s ^{2} 

b.  25 m/s, 0.6666 m/s ^{2} 

c.  1.0 m/s, 50 m/s ^{2} 

d.  50 m/s, 1.0 m/s ^{2} 

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Question number: 26
» Work, Energy and Power » Elastic and Inelastic Collisions
Question
Which of the following statements is false for collisions
(1) Momentum is conserved in elastic collisions but not in inelastic collisions.
(2) Totalkinetic energy is conserved in elastic collisions but momentum is not conserved.
(3) Total kinetic energy and momentum both are conserved in all types of collisions
(4) Total kinetic energy is not conserved in inelastic collisions but momentum is conserved
Select the correct answers and mark it according to the following codes
Choices
Choice (4)  Response  

a.  1 and 3 are correct 

b.  1 and 2 are correct 

c.  1,2 and 3 are correct 

d.  2 and 4 are correct 

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