QUESTION BANK Class X Physics (Electricity)

CBSE PHYSICS  QUESTION BANK Class X Physics (Electricity)

Very short answer questions (1 mark) 

1. Give the unit of (a) Charge (b) Current

2. Define current

3. Name the unit of (a) electrical resistance (b) resistivity

4. Define One Ohm

5. Define Resistivity

6. What is the resistance of a torch bulb rated at 2.5 V and 500 mA?

7. Two resistances of each 2 ohm are connected in parallel. Find their equalent resistance.

8. On what factors does the resistivity of a material depend?

9. Plot a graph between the Potential difference V and current I through a conductor 

10. What happens to the resistance of the circuit if the current through it is doubled?

Short answer questions (2 marks)

1. Two wires of same material are having length L and 2L. Compare their resistance and resistivity.

2. Why are coils of electric toaster and electric iron made of an alloy rather then a pure metal?

3. Two wires are of same length and radius but one of them is copper and the other is of iron. Which will have more resistance? (Given the resistivity of copper = 1.62 x 10 -8 ohm meter and resistivity of iron = 10 x 10-8 ohm meter.

4. Define 1KWh. Give the relation between 1kwh and Joule.

5. State which has a higher resistance. A 50W or 25W lamp. Also find the ratio of their resistances.

6. A wire of resistance 5 Ohm is spent in the form of closed circle. What is the resistance between 2 points at the ends of any diameter of the circle?

7. Calculate the amount of charge that would flow in one hour through the element of an electric irondrawing a current of 0.4 amps.

8. A electric toaster of resistance 20 Ohm takes a current of 5A. Calculate the heat developed in 30 s.

9. A bulb is rated at 5V, 100mA. Calculate its (1) Power (2) Resistance

10. Name two special characteristics of a heater coil.

Short answer questions (3 marks)

1. Define resistance and resistivity. Give the relation between them. Explain the dependence of resistance on temperature.

2. With the help of neat circuit, derive the expression for the equalent resistance of 3 resistances connected in series.

3. With the help of neat circuit, derive the expression for the equivalent resistance of 3 resistances connected in parallel

4. (a ) Draw the circuit consisting of a battery of five 2V cells, 5ohm resistor, 10 ohm resistor, 15 ohm resistor and a plug key. All connected in series (b) Calculate the current passing through the above circuit when key is closed.

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QUESTION BANK Class X Physics (Electricity)