Electricity (10 Science)
Electricity is the flow of electrons through a conductor, and understanding electric current, resistance, and power is crucial for practical applications.
TL;DR: Electricity is the flow of electrons through a conductor, and understanding electric current, resistance, and power is crucial for practical applicati…
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Electricity is the flow of electrons through a conductor, and understanding electric current, resistance, and power is crucial for practical applications.
Electricity MCQs with Answers & Explanations
Q1. The SI unit of electric current is:
- Volt
- Coulomb
- Ampere ✓ (correct)
- Ohm
Q2. According to Ohm's law, V = IR. What does R represent?
- Reactance
- Resistance ✓ (correct)
- Resonance
- Refraction
Q3. When resistors are connected in series, the total resistance is:
- Less than the smallest resistance
- Equal to the sum of individual resistances ✓ (correct)
- Less than the largest resistance
- Equal to the reciprocal of the sum
Q4. The equivalent resistance of three 6-ohm resistors connected in parallel is:
- 18 ohms
- 6 ohms
- 2 ohms ✓ (correct)
- 0.5 ohms
Q5. The heating effect of electric current is known as:
- Joule heating
- Ohmic heating
- Thermal heating
- All of the above ✓ (correct)
Q6. What is the power consumed by a 100-watt bulb operated for 10 hours?
- 100 watt-hours
- 1000 watt-hours ✓ (correct)
- 10 watt-hours
- 1 kilowatt
Q7. The SI unit of electrical energy is:
- Watt
- Volt
- Joule ✓ (correct)
- Coulomb
Q8. Which of the following materials is a good conductor of electricity?
- Rubber
- Glass
- Copper ✓ (correct)
- Plastic
Q9. The direction of conventional current is:
- From negative to positive terminal
- From positive to negative terminal ✓ (correct)
- From negative to positive in external circuit
- In both directions simultaneously
Q10. If the voltage across a conductor is doubled while its resistance remains constant, the current will:
- Be halved
- Remain the same
- Be doubled ✓ (correct)
- Be quadrupled
Frequently Asked Questions
Why do electric wires get hot when current flows through them?
Wires get hot due to Joule heating, caused by the resistance of the wire to the flow of electrons, converting electrical energy to heat.
What is the difference between AC and DC current?
DC current flows in one direction continuously, while AC current periodically reverses direction.
More 10 Science MCQs
- Light Reflection and Refraction
- Acids Bases and Salts
- Life Processes
- Carbon and its Compounds
- Metals and Non-metals
- Matter in Our Surroundings
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