Conservation of Mechanical Energy NEET Questions

Physics - Work, Energy, and Power

Conservation of Mechanical Energy MCQ Questions


13.
A mass m moving with velocity v collides elastically with a wall and rebounds. What happens to its kinetic energy?
A.
Doubles
B.
Remains same
C.
Becomes zero
D.
Becomes negative
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ANSWER :
B. Remains same
14.
A body of mass m is moving in a circular path of radius r with speed v. What is its total mechanical energy if only gravitational force acts?
A.
mgh
B.
0.5mv² + mgh
C.
2mgh
D.
mv²
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ANSWER :
B. 0.5mv² + mgh
15.
The work done by conservative forces in a closed path is:
A.
Zero
B.
Positive
C.
Negative
D.
Infinite
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ANSWER :
A. Zero
16.
A roller coaster reaches the highest point of its motion. Which statement is true?
A.
Maximum kinetic energy
B.
Maximum potential energy
C.
Total energy is zero
D.
No energy
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ANSWER :
B. Maximum potential energy
17.
A car of mass m moves with speed v on a horizontal road. If friction is negligible, what is the total mechanical energy of the system?
A.
0.5mv²
B.
mgh
C.
mv
D.
2mgh
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ANSWER :
A. 0.5mv²
18.
A compressed spring releases energy in the form of:
A.
Kinetic energy
B.
Potential energy
C.
Both Kinetic and Potential
D.
Chemical energy
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ANSWER :
C. Both Kinetic and Potential