Conservation of Mechanical Energy NEET Questions

Physics - Work, Energy, and Power

Conservation of Mechanical Energy MCQ Questions


1.
A ball of mass m is dropped from height H. Just before hitting the ground, which statement correctly describes its mechanical energy (ignoring air resistance)?
A.
KE = 0, PE = mgH
B.
KE = mgH, PE = 0
C.
KE = mgH/2, PE = mgH/2
D.
KE = 2mgH, PE = 0
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ANSWER :
B. KE = mgH, PE = 0
2.
A block of mass m slides down a frictionless inclined plane of height h. Its speed at the bottom is:
A.
√(gh)
B.
√(2gh)
C.
√(mgh)
D.
2gh
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ANSWER :
B. √(2gh)
3.

A block of mass 2 kg is pushed against a wall by a force of 40 N. If the coefficient of static friction between the block and the wall is 0.5, the work done by the force to move the block by 0.2 m along the wall is:

NEET - 2017

A.

8 J

B.

4 J

C.

0 J

D.

16 J

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ANSWER :

C. 0 J

4.
A spring of spring constant k is compressed by x. The elastic potential energy stored is:
A.
kx
B.
kx²
C.
½kx²
D.
2kx²
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ANSWER :
C. ½kx²
5.
At which point on the path of a freely falling body is the total mechanical energy purely kinetic?
A.
At the highest point
B.
At the midpoint
C.
Just before hitting the ground
D.
Throughout the motion
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ANSWER :
C. Just before hitting the ground
6.
A pendulum bob swings from one end to the other. At the mean (lowest) position, which is true?
A.
PE is maximum, KE is zero
B.
KE is maximum, PE is minimum
C.
Both KE and PE are equal
D.
Total energy is zero
😑 View Answer Rough Work Error
ANSWER :
B. KE is maximum, PE is minimum