MCQ questions for class 10 Science Chapter 12 Electricity
Question 1: What is the SI unit of electric current?
Ampere
Volt
Ohm
Coulomb
Question 2: Which of the following is a good conductor of electricity?
Rubber
Wood
Copper
Glass
Question 3: What is the potential difference across a resistor if a current of 2 amperes flows through it and the resistance is 4 ohms?
6 volts
2 volts
8 volts
0.5 volts
Question 4: In a parallel circuit, the potential difference across each resistor is:
Equal to the total potential difference
Equal to the potential difference of the highest resistor
Different for each resistor
Zero
Question 5: What is the function of an ammeter?
To measure potential difference
To measure current
To measure resistance
To measure capacitance
Question 6: The resistance of a wire is directly proportional to its:
Length
Area of cross-section
Material
Temperature
Question 7: What is the purpose of the fuse in an electric circuit?
To limit current in the circuit
To increase current in the circuit
To measure potential difference
To regulate resistance
Question 8: Which of the following materials is a good insulator?
Copper
Aluminum
Rubber
Silver
Question 9: What happens to the resistance of a conductor when its temperature increases?
Increases
Decreases
Remains constant
Becomes zero
Question 10: What is the formula for calculating electrical power?
P = VI
P = V/I
P = I/V
P = IR
Question 11: What is the SI unit of electric power?
Watt
Joule
Ampere
Volt
Question 12: In a series circuit, the total resistance is:
Equal to the sum of individual resistances
Less than the smallest resistance
Equal to the smallest resistance
More than the largest resistance
Question 13: What is the unit of electric energy?
Watt-hour
Joule
Ampere-hour
Volt-ampere
Question 14: The heating effect of an electric current is used in:
Electric bulbs
Refrigerators
Televisions
Computers
Question 15: What is the potential difference across a resistor if a current of 3 amperes flows through it and the resistance is 6 ohms?
18 volts
9 volts
2 volts
0.5 volts
Question 16: Which of the following statements about electric circuits is correct?
Current is the same in all parts of a series circuit
Potential difference is the same in all parts of a parallel circuit
Resistance is the same in all parts of a series circuit
Current is inversely proportional to resistance
Question 17: What is the resistance of a conductor if a potential difference of 12 volts produces a current of 4 amperes?
3 ohms
16 ohms
48 ohms
8 ohms
Question 18: Which of the following is an example of a non-ohmic resistor?
Tungsten filament lamp
Copper wire
Carbon resistor
Aluminum wire
Question 19: The unit of electric charge is the:
Ampere
Ohm
Coulomb
Volt
Question 20: What happens to the brightness of a bulb connected in a series circuit if another bulb is added in parallel to it?
Increases
Decreases
Remains the same
Becomes zero
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