Current Electricity | Practice MCQs Physics for Mdcat | mosaicbro.com

Current Electricity | Practice MCQs Physics for Mdcat

7 of 85 questions (Page 11 of 13)

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71 The work per unit charge done by the source of emf in moving a charge around a closed loop is called:
Correct Answer: A
Explanation: Emf is work done per unit charge to move charge around a circuit.
72 The total energy expended per coulomb of electricity when charge is driven round a circuit is called:
Correct Answer: B
Explanation: Emf is energy per unit charge supplied by the source.
73 The electromotive force of a battery or cell is the voltage between its terminals when:
Correct Answer: B
Explanation: Emf equals terminal voltage only in an open circuit (no current flow).
74 The electromotive force (emf) is defined by the relation:
Correct Answer: C
Explanation: Emf is work ($W$) done per unit charge ($q$): $E = \frac{W}{q}$.
75 When we connect two given cells in parallel the total emf of the combination is equal to:
Correct Answer: D
Explanation: Parallel cells with same emf yield the same emf; mismatched cells follow the larger emf.
76 By electromotive force:
Correct Answer: D
Explanation: Emf drives current in a circuit.
77 Electric generators convert:
Correct Answer: A
Explanation: Generators convert mechanical (e.g., rotational) energy to electrical energy.
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