Question

For question numbers 15 and 16, two statements are given- one labeled Assertion (A) and the

other labeled Reason (R). Select the correct answer to these questions from the codes (a), (b),

(c) and (d) as given below:

a) Both A and R are true, and R is correct explanation of the assertion.

b) Both A and R are true, but R is not the correct explanation of the assertion.

c) A is true, but R is false.

d) A is false, but R is true.

(i) Assertion (A): Three lamps connected in series will create more heat than three lamps

connected in parallel.

Reason (R): Series combination results in larger resistance.

(ii) Assertion (A): Two copper wire of different length will have the same resistance.

Reason (R): Resistivity does not depend on the length of the conductor.

OR

Assertion (A): A voltmeter is always connected in series.

Reason (R): Voltmeter is an electric device used to measure potential difference.

(iii) Assertion (A): An alloy is preferred to be used in a heating appliance.

Reason (R): Alloys have larger cross-section area and thus lower resistance.​

Answer 1

Explanation:

second part of the question:

Assertion (A): A voltmeter is always connected in series.

Reason (R): Voltmeter is an electric device used to measure potential difference.

ans: voltmeter is always connected in parallel

and voltmeter is the device used to measure potential difference

so answer is D) A is false but R is true

(iii) Assertion (A): An alloy is preferred to be used in a heating appliance.

Reason (R): Alloys have larger cross-section area and thus lower resistance.

Ans: Yes an alloy is used in heating appliance because it has high melting and boiling point than it's constituent element

so the answer is C) A is true but R is false

hope it was helpful