Online MCQs Quiz on Current Electricity

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SSC-II (Class 10) Physics; Unit-14; Current Electricity

i. An electric current in conductors is due to the flow of

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(a) positive ions

(b) negative ions

(d) free electrons

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ii. What is the voltage across a 6 Ω resistor when 3A of current passes through its?

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(a) 2 V

(b) 9 V

(d) 36 V

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iii. What happens to the intensity or the brightness of the lamps connected in series as more and more lamps are added?

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(a) increases

(b) decreases

(d) cannot be predicted

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iv. Why should household appliances be connected in parallel with the voltage source?

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(a) to increase the resistance of the circuit

(b) to decrease the resistance of the circuit

(d) to provide each appliance the same current as the power source

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v. Electric potential and e.m.f

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(a) are the same terms

(b) are the different terms

(d) both (b) and (c)

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vi. When we double the voltage in a simple electric circuit, we double the

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(a) current

(b) power

(d) both (a) and (b)

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vii. If we double both the current and the voltage in a circuit while keeping its resistance constant, the power:

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(a) remains unchanged

(b) halves

(d) Quadruple

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viii. What is the power rating of a lamp connected to a 12 V source when it carries a 2.5A?

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(a) 4.8 W

(b)14.5 W

(d) 60W

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ix. The combined resistance of two identical resistors, connected in series is 8Ω. Their combined resistance in a parallel arrangement will be:

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(a) 2 Ω

(b) 4 Ω

(d) 12 Ω

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