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Electricity - Free MCQ Practice Test with solutions, Class 8 Physics ICSE


MCQ Practice Test & Solutions: Test: Electricity (15 Questions)

You can prepare effectively for Class 8 Physics Class 8 ICSE with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Electricity". These 15 questions have been designed by the experts with the latest curriculum of Class 8 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 15

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Test: Electricity - Question 1

What material is typically used for the fuse wire?

Detailed Solution: Question 1

Fuse wires are typically made from an alloy of lead and tin. This material has a low melting point, allowing it to melt quickly in the event of excess current, thus protecting the electrical circuit.

Test: Electricity - Question 2

Which device automatically switches off when the current exceeds a safe level?

Detailed Solution: Question 2

A Miniature Circuit Breaker (MCB) automatically switches off the circuit when the current exceeds a safe level. This quick response helps to prevent electrical fires and damage to appliances.

Test: Electricity - Question 3

What happens when a short circuit occurs?

Detailed Solution: Question 3

A short circuit occurs when there is an unintended connection between live and neutral wires, allowing a large current to flow. This situation can lead to overheating, appliance damage, and potentially fires, making it a serious electrical hazard.

Test: Electricity - Question 4

How is electrical energy commonly measured for billing purposes?

Detailed Solution: Question 4

Electrical energy for billing purposes is typically measured in kilowatt-hours (kWh). This unit quantifies the amount of energy consumed over time, allowing for accurate billing based on usage.

Test: Electricity - Question 5

How is electrical energy calculated over time?

Detailed Solution: Question 5

Electrical energy is calculated using the formula Energy = Power × Time. This means the energy consumed is directly proportional to the power rating of the appliance and the duration it is used.

Test: Electricity - Question 6

What is the formula for calculating power in an electrical circuit?

Detailed Solution: Question 6

The formula for calculating power in an electrical circuit is Power = Voltage × Current (P = V × I). This relationship shows how power consumption increases with higher voltage or current.

Test: Electricity - Question 7

What is the initial reading of a kWh meter if the first reading is 5025 kWh?

Detailed Solution: Question 7

The initial reading of the kWh meter is 5025 kWh. This value represents the total energy consumed up to that point, which is crucial for tracking usage and calculating bills.

Test: Electricity - Question 8

Which of the following is a characteristic of a fuse?

Detailed Solution: Question 8

A fuse melts to break the circuit during overload conditions. This action prevents excessive current from damaging appliances or causing electrical fires, making it a crucial safety device in electrical systems.

Test: Electricity - Question 9

What does a kWh meter measure?

Detailed Solution: Question 9

A kWh meter measures the total energy consumed in kilowatt-hours (kWh). This measurement is crucial for calculating electricity bills, as it reflects the actual usage of electrical energy by various appliances within a household.

Test: Electricity - Question 10

Why should the outer body of electrical appliances be earthed?

Detailed Solution: Question 10

The outer body of electrical appliances should be earthed to prevent electric shock. If a fault occurs and the live wire touches the outer body, earthing provides a safe path for the current to flow to the ground, protecting users.

Test: Electricity - Question 11

What color is typically used for the neutral wire in household wiring?

Detailed Solution: Question 11

The neutral wire is usually colored black or light blue in household wiring. This color coding helps in safely identifying wires during installation and maintenance.

Test: Electricity - Question 12

What safety precaution should be taken when using electrical gadgets?

Detailed Solution: Question 12

Ensuring proper earthing is a critical safety precaution when using electrical gadgets. This helps prevent electric shocks by providing a safe path for stray currents, thereby protecting the user and the appliances.

Test: Electricity - Question 13

Which voltage is typically supplied to households in India?

Detailed Solution: Question 13

Households in India are typically supplied with 220 V of A.C. This voltage level is standard for most household appliances, ensuring they operate efficiently without damage.

Test: Electricity - Question 14

What is the consequence of overloading an electrical circuit?

Detailed Solution: Question 14

Overloading an electrical circuit can lead to a potential fire hazard. When too many devices draw current beyond the circuit's capacity, it can cause overheating, damaging wires and potentially igniting a fire.

Test: Electricity - Question 15

What is the function of the earth wire in household wiring?

Detailed Solution: Question 15

The earth wire is designed to protect against electric shocks by providing a safe path for excess current to flow into the ground. This is vital for appliances with metallic bodies, ensuring user safety.

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