(English Medium) ICSE Class 10 - CISCE Important Questions for Physics

You have three resistors of values 2Ω, 3Ω and 5Ω. How will you join them so that the total resistance is more than 7Ω?

1) Draw a diagram for the arrangement

2) Calculate the equivalent resistance.

Name two safety devices which are connected to the live wire of a household electric circuit

Find the equivalent resistance between A and B

State whether the resistivity of a wire changes with the change in the thickness of the wire.

How does an increase in the temperature affect the specific resistance of a : 
(i) Metal and
(ii) Semiconductor ?

Calculate the effective resistance across AB?

The diagram above shows a circuit with the key k open. Calculate :
(i) the resistance of the circuit when the key k is open.
(ii) the current drawn from the cell when the key k is open.
(iii) the resistance of the circuit when the key k is closed.
(iv) the current drawn from the cell when the key k is closed.

The diagram below shows a magnetic kept just below the conductor AB which is kept in North South direction.

(i) In which direction will the needle deflect when the key is closed ?
(ii) Why is the deflection produced ?
(iii) What will be the change in the deflection if the magnetic needle is taken just above the conductor AB ?
(iv) Name one device which works on this principle.

(a) Calculate the total resistance across AB.

(b) If a cell of e.m.f 2.4 V with negligible internal resistance is connected across AB then calculate the current drawn from the cell.

(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.

(b) Is it safe to handle the bulb when the switch is OFF?

(c) Give a reason for your answer in (b).

An electric bulb is rated ‘240 V, 100 W’.

1. What information can you get from the above statement?
2. What will happen if this bulb is connected across 220 V?
3. Calculate the resistance of the bulb.
4. Also find the energy consumed by the bulb in 10 minutes.

When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by ______.

Choose the correct relation for e.m.f. (ε) and terminal voltage V:

'A geyser is rated 240 W-220 V'. Explain the meaning of this statement.

Find the value of current I drawn from the cell.

1. Calculate the current I.
2. Calculate the terminal voltage.

The potential difference between terminals of a cell in a closed electric circuit is ______.

Sumit does 600 J of work in 10 min and Amit does 300 J of work in 20 min. Calculate the ratio of the powers delivered by them.

1. Resistance
2. Intensity of light

A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V Write Yes or No. Give supporting calculations to justify your answer.