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.

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
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   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
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   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.

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