Science · Effects of current · chapter 11 of 13

Class 10 Science Chapter 11: Electricity Assertion-reason questions with answers

2 assertion-reason questions on Electricity, each with its answer and the reason, written from the NCERT chapter. Open a question's solution to check your working; then take the free test to find your next chapter. Each question gives an Assertion (A) and a Reason (R); choose how they stand to each other.

Question 1
Assertion (A): In a circuit with two lamps in series, an ammeter reads the same whether it is placed before the first lamp or after the second. Reason (R): In a series combination the same current flows through every component.
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Answer: (a) Both A and R are true, and R is the correct explanation of A.

Both true. Because the same current flows through every part of a series circuit, the ammeter reading does not depend on where it is placed, so R explains A.

Question 2
Assertion (A): Most of the power consumed by the filament of a lit bulb appears as heat, not light. Reason (R): Tungsten is used for filaments because it melts only at 3380 °C.
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Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Both statements are true. R explains why the filament survives the heat without melting; it does not explain why most of the power becomes heat.

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