Work, Energy and Power (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 52  56 of 63
Visit this page to view all the question topics
To view these problems with solutions proceed here and click "Subscribe Now".
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 

To view these problems with solutions proceed here and click "Subscribe Now".
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 

To view these problems with solutions proceed here and click "Subscribe Now".
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 

To view these problems with solutions proceed here and click "Subscribe Now".
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 

To view these problems with solutions proceed here and click "Subscribe Now".
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 

To view these problems with solutions proceed here and click "Subscribe Now".