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.

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.
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   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.
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   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.
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   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.
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   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
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   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.

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