(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Physics

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

A cell is used to send current to an external circuit.

1. How does the voltage across its terminals compare with its e.m.f.?
2. Under what condition is the e.m.f. of a cell equal to its terminal voltage? 

How is the working of an electric bell affected, if alternating current be used instead of direct current?

The diagram below in Fig. 8.40 shows a cell of e.m.f. ε = 2 volt and internal resistance r = 1 ohm to an external resistance R = 4 ohm. The ammeter A measures the current in the circuit and the
voltmeter V measures the terminal voltage across the cell. What will be the readings of the ammeter and voltmeter when (i) the key K is open, (ii) the key K is closed. 

A battery of e.m.f 3.0 V supplies current through a circuit in which the 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. Find the internal resistance of the battery. 

A cell of e.m.f. 1.8V and internal resistance 2Ω is connected in series with an ammeter of resistance 0.7Ω and a resistor of 4.5Ω as shown in Fig. 

1. What would be the reading of the ammeter?
2. What is the potential difference across the terminals of the cell? 

A battery of e.m.f. 15 V and internal resistance 3 ohm is connected to two resistors of resistances 3 ohm and 6 ohm is series Find:
(a) the current through the battery
(b) the p.d. between the terminals of the battery. 

A cell of e.m.f. ε and internal resistance 𝔯 sends current 1.0 A when it is connected to an external resistance 1.9 Ω. But it sends current 0.5 A when it is connected to an external resistance 3.9 Ω. Calculate the values of ε and 𝔯.

Describe one experiment to demonstrate the phenomenon of electromagnetic induction.

Name the type of energy (kinetic energy K or potential energy U) possessed in the following case:

A piece of stone placed on the roof.

1. What kind of energy change takes place when a magnet is moved towards a coil having a galvanometer at its ends?
2. Name the phenomenon.

State different forms of potential energy and give one example of each.

Write an expression for the potential energy of a body of mass m placed at a height h above the earth's surface. State the assumptions made, if any.

Name the form of energy which a body may possess even when it is not in motion. Give an example to support your answer.

What do you understand by the kinetic energy of a body?

In which of the following case does the electromagnetic induction occur?
The current is stopped in a wire held near a loop of wire .

In which of the following case does the electromagnetic induction occur?

A magnet is moved through a loop of wire .

In which of the following case does the electromagnetic induction occur?

A loop of wire is held near a magnet.

A body of mass m is moving with a velocity v. Write the expression for its kinetic energy.

State the work energy theorem.