Electricity Quiz - ICSE Class 8 Science

Free practice quiz: Electricity (ICSE Class 8 Science). 49 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 8 Science practice quiz has 49 multiple-choice questions on Electricity, and 49 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. In a series circuit, if one bulb burns out, what happens to the other bulbs?

   1. They glow brighter.
   2. They glow dimmer.
   3. They go out.
   4. They remain unaffected.
   Show answer

   Answer: C. They go out.

   In a series circuit, the components are connected in a single path. If one component breaks the circuit (like a burnt-out bulb), the entire circuit is broken, and current cannot flow through any of the components. Therefore, all other bulbs will go out.

2. A closed electrical circuit is required for:

   1. Current to flow.
   2. Voltage to be measured.
   3. Resistance to be increased.
   4. Insulation to be tested.
   Show answer

   Answer: A. Current to flow.

   For electric current to flow, there must be a complete, unbroken path for the charge to move. This unbroken path is called a closed circuit. An open circuit, where there is a break, prevents current flow.

3. If the resistance of a circuit is halved while the voltage remains the same, what is the change in the current?

   1. The current is halved.
   2. The current doubles.
   3. The current remains the same.
   4. The current becomes one-fourth.
   Show answer

   Answer: B. The current doubles.

   According to Ohm's Law (I = V/R), current (I) is inversely proportional to resistance (R) when voltage (V) is constant. If the resistance is halved, the current will double to maintain the relationship V = I * R.

4. When a material is said to be 'electrically charged', it means it has:

   1. An excess of neutrons.
   2. A deficit of electrons.
   3. An equal number of protons and electrons.
   4. An excess of positive ions.
   Show answer

   Answer: B. A deficit of electrons.

   Electrical charge is primarily associated with electrons (negative charge) and protons (positive charge). A material becomes positively charged when it loses electrons (deficit of electrons). If it gains electrons, it becomes negatively charged. An equal number of protons and electrons results in a neutral charge.

5. What is the relationship between electrical power (P), current (I), and voltage (V)?

   1. P = V / I
   2. P = I / V
   3. P = V * I
   4. P = V + I
   Show answer

   Answer: C. P = V * I

   Electrical power is the product of voltage and current. This formula (P = V * I) is fundamental in understanding electrical circuits and energy consumption.

More questions in this quiz

Answers and explanations are in the full quiz.

1. Which of the following materials is the best conductor of electricity?
2. What is the unit of electric current?
3. Ohm's Law states the relationship between voltage, current, and resistance. Which equation correctly represents Ohm's Law?
4. What does a resistor do in an electric circuit?
5. Which device is used to measure electric potential difference (voltage)?
6. If you have two identical resistors connected in parallel to a battery, how does the total resistance compare to the resistance of a single resistor?
7. What is the primary function of a fuse in an electrical circuit?
8. Which of the following is a unit of electrical power?
9. What happens to the resistance of a metallic conductor when its temperature is increased?
10. Which of the following is an example of an insulator?
11. If the voltage across a circuit is doubled, and the resistance remains the same, what happens to the current?
12. What is the function of a switch in an electric circuit?
13. In a parallel circuit, how does the total current from the source compare to the sum of the currents in each branch?
14. Which unit measures the amount of electrical charge?
15. What is the effect of increasing the length of a wire on its resistance, assuming other factors remain constant?
16. A circuit with a battery, a switch, and a light bulb is an example of a:
17. Which of the following materials would be the LEAST effective conductor of electricity?
18. What is the main difference between direct current (DC) and alternating current (AC)?
19. A circuit is connected with a battery, three resistors in series, and an ammeter. If the ammeter reads 0.5 A, what is the current flowing through each resistor?
20. What is the purpose of an insulator in electrical wiring?
21. If a circuit has a voltage of 12V and a total resistance of 4 Ohms, what is the current flowing through the circuit according to Ohm's Law?
22. Which of the following symbols typically represents a resistor in a circuit diagram?
23. If a wire's cross-sectional area is increased, while its length and material remain the same, how does its resistance change?
24. Which instrument is used to measure electrical resistance?
25. What is the potential difference across a 10 Ohm resistor when a current of 2 A flows through it?
26. Which of the following is NOT a component of a simple electric circuit?
27. What is the SI unit of electrical resistance?
28. If you double the voltage and double the resistance in a circuit, what happens to the current?
29. Which component converts electrical energy into light energy?
30. In a series circuit, what happens to the total resistance when more resistors are added in series?
31. What is the charge of an electron?
32. A device that stores chemical energy and converts it into electrical energy is called a:
33. If a fuse has a rating of 5 Amperes, what will happen if a current of 7 Amperes flows through it?
34. In a parallel circuit, the voltage across each branch is:
35. Which of the following statements about conductors and insulators is correct?
36. When a body loses electrons, it becomes:
37. Which of these is a unit of electric potential difference?
38. If you have two identical resistors connected in series, what is the total resistance compared to one resistor?
39. What term describes the opposition to the flow of electric current?
40. Which of the following circuit configurations provides multiple paths for current to flow?
41. What is the function of a generator in an electrical context?
42. If the voltage across a resistor is 5V and the current through it is 2A, what is its resistance?
43. What happens to the resistance of a semiconductor when its temperature is increased?
44. Which of the following is an example of a conductor that is commonly used in electrical wiring due to its low resistance and cost-effectiveness?

More quizzes

• Energy (including Heat Transfer)▶ Play
• Force and Pressure▶ Play
• Light Energy▶ Play
• Motion▶ Play
• Physical Quantities and Measurement▶ Play
• Sound▶ Play

Browse all Physics quizzes

More to play