Current electricity — Physics MCQs (Class 12)
Free chapter-wise Physics MCQs with answers for MDCAT, FSc and entry tests.
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#17 The energy dissipated in a resistor in time t is
A) $I^{2}Rt$
B) $V^{2}t/R$
C) V I t
D) All of these
#18 The SI unit of electrical energy is
A) Joule
B) Kilowatt-hour
C) Both A and B
D) Neither A nor B
#19 1 kilowatt-hour is equal to
A) $3.6\times10^{6} J$
B) $3.6\times10^{3} J$
C) $3.6\times10^{-3} J$
D) $3.6\times10^{-6} J$
#20 The emf of a cell is defined as
A) Work done per unit charge
B) Energy per unit charge
C) Both A and B
D) Neither A nor B
#21 The terminal voltage of a cell is equal to emf when
A) No current is drawn
B) Current is drawn
C) The cell is short-circuited
D) The cell is open-circuited
#22 The internal resistance of a cell can be determined by
A) Potentiometer
B) Meter bridge
C) Both A and B
D) Neither A nor B
#23 The potentiometer is used to
A) Measure emf
B) Compare emfs
C) Measure internal resistance
D) All of these
#24 The Wheatstone bridge is used to measure
A) Resistance
B) Current
C) Voltage
D) Power
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