Conservation of Mechanical Energy NEET Questions

Physics - Work, Energy, and Power

Conservation of Mechanical Energy MCQ Questions


13.
The potential energy of a long spring when stretched by 2 cm is U. If the spring is stretched by 8 cm, the potential energy stored in it will be:

NEET - 2023

A.
4U
B.
8U
C.
16U
D.
2U
๐Ÿ˜‘ View Answer Rough Work Error
ANSWER :
C. 16U
14.
A spring is stretched by 0.2 m. Then it is compressed by 0.2 m. Ratio of PE in the two cases is:
A.
1 : 2 (compression stores more energy)
B.
2 : 1 (extension stores more energy)
C.
1 : 1 (same PE for equal magnitude displacement)
D.
Cannot be determined
๐Ÿ˜‘ View Answer Rough Work Error
ANSWER :
C. 1 : 1 (same PE for equal magnitude displacement)
15.
Work done by an external agent in slowly compressing a spring (k = 600 N/m) by 0.05 m is:
A.
0.75 J
B.
1.5 J
C.
0.375 J
D.
3 J
๐Ÿ˜‘ View Answer Rough Work Error
ANSWER :
A. 0.75 J
16.
A spring (k = 400 N/m) block moves from xแตข = 0.1 m to xf = 0.3 m. Work done BY spring force is:
A.
+16 J
B.
โˆ’16 J
C.
โˆ’4 J
D.
4 J
๐Ÿ˜‘ View Answer Rough Work Error
ANSWER :
B. โˆ’16 J
17.
The potential energy of a certain spring when stretched through a distance 'S' is 10 joules. The amount of work that must be done on this spring to stretch it through an additional distance 'S' will be:

NEET - 2022

A.
30 J
B.
40 J
C.
10 J
D.
20 J
๐Ÿ˜‘ View Answer Rough Work Error
ANSWER :
D. 20 J
18.
A block on a spring is pulled to extension xm = 0.2 m, then pushed back to the natural length. Work done by spring force over this round trip is:
A.
+ยฝk(0.2)ยฒ
B.
โˆ’ยฝk(0.2)ยฒ
C.
ยฝk(0.2)ยฒ
D.
0
๐Ÿ˜‘ View Answer Rough Work Error
ANSWER :
D. 0