Which one of the following is NOT the unit of energy ?
Joule
Watt-hr
Newton-metre
kg-metre/sec²
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-2 – 2020
A) Joule (J) is the standard SI unit of energy and work.
B) Watt-hour (Wh) is a unit of energy, calculated as power (Watt) multiplied by time (hour). 1 Wh = 1 J/s * 3600 s = 3600 J.
C) Newton-metre (Nm) is the unit of work (Force x Distance). Work is a form of energy transfer, so Nm is equivalent to a Joule (1 Nm = 1 J). Note: Nm is also the unit of torque, but in the context of options alongside Joule and Watt-hour, it represents work/energy.
D) kg-metre/sec² is the unit of force (mass x acceleration, F = ma). 1 kg⋅m/s² = 1 Newton (N). It is not a unit of energy.