Heating Effects of Electric Current Quiz - CBSE Class 9 Science

Free practice quiz: Heating Effects of Electric Current (CBSE Class 9 Science). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 9 Science practice quiz has 18 multiple-choice questions on Heating Effects of Electric Current, and 18 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. Joule
   Show answer

   Answer: A. Ampere

   The unit of electric current is Ampere.

2. Which device is used to measure electric current?

   1. Voltmeters
   2. Ammeters
   3. Ohmmeters
   4. Galvanometers
   Show answer

   Answer: B. Ammeters

   Ammeters are the devices used to measure electric current.

3. Which of the following is a practical application of the heating effect of current?

   1. Electric fan
   2. Electric iron
   3. Water cooler
   4. LED bulb
   Show answer

   Answer: B. Electric iron

   Electric iron is designed to utilize the heating effect of electric current to press clothes.

4. In an electric circuit, what will happen if we double the current through a resistor?

   1. The power doubles
   2. The power quadruples
   3. The power halves
   4. The power remains the same
   Show answer

   Answer: B. The power quadruples

   According to the formula P = I^2R, if the current is doubled, the power becomes four times since power is proportional to the square of current.

5. A 100-watt bulb is left on for 5 hours. How much energy does it consume?

   1. 0.5 kWh
   2. 5 kWh
   3. 0.1 kWh
   4. 1 kWh
   Show answer

   Answer: A. 0.5 kWh

   Energy consumed = Power × Time = 100 watts × 5 hours = 500 watt-hours = 0.5 kWh.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which material is considered a good conductor of electricity?
2. What happens to the electric current when the resistance increases in a circuit where voltage is constant?
3. What is the relationship between voltage, current, and resistance called?
4. Which of the following metals is used for the filament of light bulbs due to its high melting point?
5. Why does electric current produce heat in a conductor?
6. What is the formula for calculating electric power in terms of current and resistance?
7. Which law relates the heat produced in a conductor to the square of the current, resistance, and time?
8. How does resistance behave with temperature in conductors?
9. What happens to the filament of a bulb when current passes through it?
10. When is the heating effect used in electric toasters?
11. What factor does NOT affect the heating effect of current?
12. If a conductor has a resistance of 12 ohms and we want to decrease the heating effect, what should be done?
13. Which is the best configuration of connecting resistors to reduce heating effect?

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