Conservation of Mechanical Energy NEET Questions

Physics - Work, Energy, and Power
Conservation of Mechanical Energy

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
😑 View Answer Error
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
😑 View Answer Error
ANSWER :
B. √(2gh)
3.
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
4.
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
😑 View Answer Error
ANSWER :
C. Just before hitting the ground
5.
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 Error
ANSWER :
B. KE is maximum, PE is minimum
6.
A block attached to a spring (spring constant k) is extended by xm and released from rest on a frictionless surface. At equilibrium position x = 0, the speed vm is:
A.
vm = √(k/m) · xm
B.
vm = √(2k/m) · xm
C.
vm = k·xm/m
D.
vm = xm · √(m/k)
😑 View Answer Error
ANSWER :
A. vm = √(k/m) · xm
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