Solved: PHYSICS Question for NEET

NEET PHYSICSEasy

Which does not have the same unit as others?

Watt-sec

Kilowatt-hour

J-sec

Analyze Option A (Watt-sec): Power ( $P$ ) is defined as Work/Time ( $W/t$ ). Therefore, Work/Energy = Power $\times$ Time. Watt-second is a unit of Energy ( $1 \text{ W s} = 1 \text{ J}$ ).
Analyze Option B (Kilowatt-hour): This is a commercial unit of Energy, commonly used for electricity. $1 \text{ kWh} = 3.6 \times 10^6 \text{ J}$ .
Analyze Option C (eV): The electron volt (eV) is a unit of Energy used in atomic and nuclear physics. $1 \text{ eV} \approx 1.60 \times 10^{-19} \text{ J}$ .
Analyze Option D (J-sec): Joule-second is the unit of Planck's constant ( $h$ ) . It represents Energy $\times$ Time (Dimensions: $[ML^2T^{-1}]$ ), which corresponds to Angular Momentum, not Energy.
Conclusion: Watt-sec, Kilowatt-hour, and eV are all units of Energy. J-sec is a unit of Action or Angular Momentum.

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