Kinetic & Potential Energy NEET Questions

Physics - Work, Energy, and Power

Kinetic & Potential Energy MCQ Questions


13.
An electron (mass mₑ) has KE = 10 keV. A proton (mass mₚ = 1836 mₑ) has KE = 100 keV. Which is faster? [NCERT Ex 5.12]
A.
Proton (higher KE)
B.
Electron (lower mass compensates for lower KE)
C.
Both have same speed
D.
Cannot determine
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ANSWER :
B. Electron (lower mass compensates for lower KE)
14.
Potential energy is:
A.
Energy due to motion
B.
Stored energy by virtue of position or configuration of a body
C.
Energy due to temperature
D.
Energy due to electric charge
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ANSWER :
B. Stored energy by virtue of position or configuration of a body
15.
Potential energy can be defined ONLY for:
A.
All forces
B.
Non-conservative forces like friction
C.
Conservative forces (gravity, spring force, etc.)
D.
Contact forces only
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ANSWER :
C. Conservative forces (gravity, spring force, etc.)
16.
The change in potential energy (ΔV) is related to work done by a conservative force (W_cons) by:
A.
ΔV = W_cons
B.
ΔV = −W_cons
C.
ΔV = 2W_cons
D.
W_cons = ΔV/2
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ANSWER :
B. ΔV = −W_cons
17.
The zero of potential energy is:
A.
Always at the Earth's surface
B.
Always at the equilibrium position
C.
Arbitrary — set according to convenience for each problem
D.
Always at infinity
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ANSWER :
C. Arbitrary — set according to convenience for each problem
18.
Gravitational potential energy of a mass m at height h above ground (taking ground as reference level, g = constant) is:
A.
mgh²/2
B.
½mgh
C.
mgh
D.
mg/h
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ANSWER :
C. mgh