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.

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
   Show answer

   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
   Show answer

   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
   Show answer

   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.

Browse all Electric Current and Its Effects quizzes