Name the material used for making a fuse wire. Give a reason.

Important Questions on Current Electricity

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 8 - Current Electricity>QUESTIONS>Q 17

What is a superconductor? Give one example of it.

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 8 - Current Electricity>QUESTIONS>Q 18

Explain the meaning of the terms e.m.f., terminal voltage and internal resistance of cell.

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 8 - Current Electricity>QUESTIONS>Q 19

A battery of e.m.f. 3.0 V supplies current through a circuit in which resistance can be changed. A high resistance voltmeter is connected across the battery. When the current is 1.5 A, the voltmeter reads 2.7 V. The internal resistance of the battery is_____ohm.

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 8 - Current Electricity>QUESTIONS>Q 20

What are the affecting factors of internal resistance of a cell?

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 8 - Current Electricity>QUESTIONS>Q 21

A cell of emf and internal resistance r is used to send current to an external resistance R. Write expressions for (a) the total resistance of the circuit (b) the current drawn from the cell and (c) the p.d. across the cell (d) voltage drop inside the cell.

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 8 - Current Electricity>QUESTIONS>Q 22

A cell is used to send current to an external circuit. (a) How does the voltage across its terminal compare with its emf? (b) Under what condition is the emf of a cell equal to its terminal voltage?

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 8 - Current Electricity>QUESTIONS>Q 23

Explain why the p.d. across the terminals of a cell is more in an open circuit and reduced in a closed circuit.

HARD

10th ICSE

IMPORTANT

S CHAND'S ICSE PHYSICS BOOK 2>Chapter 8 - Current Electricity>QUESTIONS>Q 24

If two resistors having resistance