Current Electricity Quiz - CBSE Class 10 Science
Free practice quiz: Current Electricity (CBSE Class 10 Science). 19 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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What is the unit of electric current?
- Volt
- Ampere
- Ohm
- Watt
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Answer: B. Ampere
The unit of electric current is Ampere. This is a standard unit of measurement for current in physics.
If the resistance in a circuit increases, what happens to the current?
- Increases
- Decreases
- Remains the same
- Fluctuates
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Answer: B. Decreases
According to Ohm's Law, current is inversely proportional to resistance. If resistance increases, current decreases.
What is the primary function of a fuse in an electric circuit?
- To convert AC to DC
- To increase the resistance
- To protect the circuit from overloading
- To decrease the current
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Answer: C. To protect the circuit from overloading
A fuse is a safety device that protects an electric circuit from excessive current by melting and breaking the circuit when the current exceeds a certain threshold.
What happens to the total current when more branches are added to a parallel circuit?
- Increases
- Decreases
- Remains the same
- Becomes zero
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Answer: A. Increases
Adding more branches to a parallel circuit provides additional paths for the current to flow, hence increasing the total current drawn from the power supply.
How does cross-sectional area affect the resistance of a wire?
- Increases resistance
- Decreases resistance
- Has no effect
- Doubles resistance
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Answer: B. Decreases resistance
Resistance decreases as the cross-sectional area of a wire increases because a larger area allows more electrons to pass through simultaneously, reducing opposition to flow.