Current Electricity Quiz - CBSE Class 10 Science

Free practice quiz: Current Electricity (CBSE Class 10 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 10 Science practice quiz has 19 multiple-choice questions on Current Electricity, and 19 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the unit of electric current?

   1. Volt
   2. Ampere
   3. Ohm
   4. Watt
   Show answer

   Answer: B. Ampere

   The unit of electric current is Ampere. This is a standard unit of measurement for current in physics.

2. If the resistance in a circuit increases, what happens to the current?

   1. Increases
   2. Decreases
   3. Remains the same
   4. Fluctuates
   Show answer

   Answer: B. Decreases

   According to Ohm's Law, current is inversely proportional to resistance. If resistance increases, current decreases.

3. What is the primary function of a fuse in an electric circuit?

   1. To convert AC to DC
   2. To increase the resistance
   3. To protect the circuit from overloading
   4. To decrease the current
   Show answer

   Answer: C. To protect the circuit from overloading

   A fuse is a safety device that protects an electric circuit from excessive current by melting and breaking the circuit when the current exceeds a certain threshold.

4. What happens to the total current when more branches are added to a parallel circuit?

   1. Increases
   2. Decreases
   3. Remains the same
   4. Becomes zero
   Show answer

   Answer: A. Increases

   Adding more branches to a parallel circuit provides additional paths for the current to flow, hence increasing the total current drawn from the power supply.

5. How does cross-sectional area affect the resistance of a wire?

   1. Increases resistance
   2. Decreases resistance
   3. Has no effect
   4. Doubles resistance
   Show answer

   Answer: B. Decreases resistance

   Resistance decreases as the cross-sectional area of a wire increases because a larger area allows more electrons to pass through simultaneously, reducing opposition to flow.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which device is used to measure electric current?
2. What is the relationship between voltage and current according to Ohm's Law?
3. What is the drift velocity of electrons in a conductor?
4. What happens to the resistivity of a conductor as the temperature increases?
5. Which of the following materials is an example of a good conductor of electricity?
6. Which of the following is true for a series circuit?
7. In a parallel circuit, how does the voltage across each branch compare?
8. What is one of the factors that resistivity depends on?
9. What does the term 'electrical power' refer to?
10. Which of the following equations is used to calculate electrical power in terms of voltage and current?
11. Why are copper wires commonly used for electrical wiring?
12. What is the main advantage of using alternating current (AC) over direct current (DC) in power distribution?
13. Why does a filament lamp's resistance increase as more current flows through it?
14. Which material might be used for a component intended to have very low resistance?

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