WILLER ACADEMY

Class 10 Science Chapter 11 Quiz

Electricity

1. What is being measured using the voltmeter in a circuit across a resistor?
a) Current in the circuit b) Voltage in the circuit c) The voltage across the resistor d) The resistance offered by the resistor

2. The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is:
a) < 100 Ω b) < 4 Ω c) < 1 Ω d) > 2 Ω

3. Work of 14 J is done to move 2 C charge between two points on a conducting wire. What is the potential difference between the two points?
a) 28 V b) 14 V c) 7 V d) 12 V

4. A current of 1 A is drawn by a filament of an electric bulb. The number of electrons passing through a cross-section of the filament in 16 seconds would be roughly:
a) 10²⁰ b) 10¹⁶ c) 10¹⁸ d) 10²³

5. How much more heat is produced if the current is doubled in a resistor?
a) Twice the original amount b) Thrice the original amount c) Four times the original amount d) Five times the original amount

6. Define electric current and write its SI unit. (2 marks)

7. State Ohm’s law. (2 marks)

8. Calculate the resistance of a resistor if a 12 V battery causes a current of 2.5 mA to flow through it. (3 marks)

9. Why does a nichrome wire get heated first when current is passed through it along with a copper wire of same length and area? (3 marks)

10.
a) State Joule’s law of heating.
b) Calculate the heat produced in a 4 Ω resistor connected across 20 V supply and current of 5 A flows through it for 1 second. (5 marks)

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