Electric Current and Its Effects Quiz - CBSE Class 9 Science

Free practice quiz: Electric Current and Its Effects (CBSE Class 9 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 9 Science practice quiz has 20 multiple-choice questions on Electric Current and Its Effects, and 20 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. Ampere
   2. Volt
   3. Ohm
   4. Watt
   Show answer

   Answer: A. Ampere

   The SI unit of electric current is the ampere, named after André-Marie Ampère.

2. How are electric circuits usually represented in diagrams?

   1. Words
   2. Symbols
   3. Pictures
   4. Numbers
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   Answer: B. Symbols

   Electric circuits are represented using symbols to simplify the complex connections between circuit components.

3. What does a resistor do in a circuit?

   1. Increases current
   2. Decreases current
   3. Stores energy
   4. Generates heat only
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   Answer: B. Decreases current

   A resistor limits the flow of electric current in a circuit by providing resistance.

4. Who discovered the relationship between voltage, current, and resistance?

   1. Isaac Newton
   2. Albert Einstein
   3. Georg Ohm
   4. Nikola Tesla
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   Answer: C. Georg Ohm

   Georg Ohm discovered the relationship between voltage, current, and resistance, known as Ohm's Law.

5. What happens to the resistance in a parallel circuit as more branches are added?

   1. Resistance increases
   2. Resistance decreases
   3. Resistance stays the same
   4. Current decreases
   Show answer

   Answer: B. Resistance decreases

   Adding more branches in a parallel circuit decreases the overall resistance because the paths for current increase.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following materials is a good conductor of electricity?
2. What is the formula to calculate electric current?
3. What device is used to measure electric current?
4. Which material is an insulator of electricity?
5. What is one effect of electric current passing through a resistor?
6. What does an electric circuit require to start working?
7. Which part of a circuit ensures the flow of electrical energy?
8. What kind of path does electric current require to flow?
9. How is energy consumed in a circuit measured?
10. What principle does a fuse work on?
11. What is the relationship called that defines the flow of current and voltage in a conductor?
12. Which device converts electrical energy into mechanical energy?
13. What causes a magnetic field around a current-carrying wire?
14. Why is the earth wire connected to the metal body of an electrical appliance?
15. What is the effect called when a coil produces an electric current due to changes in the magnetic field?

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