Work, Energy and Power (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 52  56 of 63
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Question number: 52
» Work, Energy and Power » Work Done
Question
A chain of linear density 5 kg/m and length 8 m is lying on the table with 4 m of chain hanging from the edge. The work done in lifting the chain on the table will be –
Choices
Choice (4)  Response  

a.  98 J 

b.  196 J 

c.  392 J 

d.  235.2 J 

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Question number: 53
» Work, Energy and Power » Work Done
Assertion (Ꭺ)
Sum of work done by the Newton’s 3 ^{rd} law pair internal forces, acting between two panicles may be zero.
Reason (Ꭱ)
If two particles undergo same displacement then work done by Newton’s 3 ^{rd} law pair forces on them is of opposite sign and equal magnitude.
Choices
Choice (4)  Response  

a.  Ꭺ is false but Ꭱ is true 

b.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Ꭺ is true but Ꭱ is false 

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Question number: 54
» Work, Energy and Power » Potential Energy
Question
A tennis ball dropped from a height of 7 m rebounds only 1.6 f meter after hitting the ground. What fraction of energy is lost in the impact?
Choices
Choice (4)  Response  

a.  2.45 

b.  0.466 

c.  1.26 

d.  0.771 

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Question number: 55
» Work, Energy and Power » Work Done
Question
A body is acted upon by a force F =i + 2j + 3k. The work done by the force in displacing it from (0, 0, 0) to (0, 0, 4m) will be
Choices
Choice (4)  Response  

a.  10 J 

b.  12 J 

c.  6 J 

d.  8 J 

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Question number: 56
» Work, Energy and Power » Kinetic Energy
Question
A ball moving with a speed of 9 m/s strikes with an identical stationary ball such that after the collision the direction of each ball makes an angle of 30° with the original line of motion. Find the speeds of the two balls after the collision. Is the kinetic energy conserved in this collision process?
Choices
Choice (4)  Response  

a.  6 √3 m/s, yes 

b.  0, yes 

c.  6 √3 m/s, no 

d.  3 √3 m/s, no 

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