Electricity MCQ Test – Class 10th Science Online Quiz with Score

Q1. A device that changes the resistance in an electric circuit is called a:

A Rheostat
B Ammeter
C Galvanometer
D Voltmeter

Q2. What is the potential difference required to make 1 A of current flow through a resistance of 1 Ohm?

A 10 Volt
B 1 Volt
C 0.5 Volt
D 2 Volt

Q3. When resistors are connected in series, the total resistance is:

A Less than the smallest individual resistance
B Equal to the smallest individual resistance
C Always zero
D Greater than the largest individual resistance

Q4. Assertion (A): Nichrome alloy is extensively used in the heating elements of electrical appliances like toasters and electric irons. Reason (R): Nichrome has a very high resistivity and a high melting point, making it suitable for producing significant heat without melting.

A Both A and R are true, and R is the correct explanation of A.
B A is true, but R is false.
C Both A and R are true, but R is not the correct explanation of A.
D A is false, but R is true.

Q5. Assertion (A): Tungsten metal is used for making the filament of incandescent electric lamps. Reason (R): Tungsten has a very high melting point and produces light at high temperatures without melting.

A Both A and R are true and R is the correct explanation of A.
B A is true but R is false.
C Both A and R are true but R is not the correct explanation of A.
D A is false but R is true.

Q6. The resistance of an ideal ammeter is:

A Very high
B Zero
C Slightly negative
D Infinite

Q7. An electric heater is rated at 2.2 kW and operates on a 220 V household supply. What is the minimum rating of the fuse that should be used in the circuit to protect the heater?

A 5 A
B 15 A
C 8 A
D 10 A

Q8. Resistivity of a conductor depends on:

A Nature of material
B Shape
C Length
D Cross-sectional area

Q9. An electric iron of 1000 W is used for 2 hours daily. If the cost of 1 unit of electricity is Rs. 5, what is the cost of using the iron for 30 days?

A Rs. 300
B Rs. 500
C Rs. 100
D Rs. 1000

Q10. A circuit consists of two resistors in series. If the voltage across the first resistor is 5 V and the total voltage is 12 V, what is the voltage across the second resistor?

A 17 V
B 12 V
C 7 V
D 5 V

Q11. Which of the following is an ohmic conductor?

A Transistor
B LED
C Copper wire
D Diode

Q12. Which of the following is an example of an electrical insulator?

A Copper
B Aluminium
C Graphite
D Wood

Q13. The energy supplied by the cell in moving a unit charge from one end to the other is called its:

A Electromotive force (EMF)
B Current
C Potential difference
D Resistance

Q14. If the current through a resistor is doubled, the heat produced in a given time interval will:

A Be halved
B Be doubled
C Be quadrupled
D Remain the same

Q15. When the length of a metallic wire is doubled, its resistance will:

A Be quadrupled
B Be doubled
C Be halved
D Remain the same

Q16. An electric heater is rated 1500 W, 220 V. The current drawn by it is:

A 1.5 A
B 0.147 A
C 15 A
D 6.82 A

Q17. Which statement is true for voltage in a parallel circuit?

A Voltage is zero in a parallel circuit.
B Voltage varies across different components.
C Voltage is the same across all components.
D Voltage decreases with current.

Q18. Which of the following is a good conductor of electricity?

A Pure water
B Glass
C Plastic
D Saltwater

Q19. A conductor has 10²0 free electrons passing through a cross-section in 2 seconds. The current flowing is:

A 16 A
B 8 A
C 0.8 A
D 1.6 A

Q20. The resistance of a conductor is inversely proportional to its:

A Length
B Cross-sectional area
C Resistivity
D Temperature

Electricity — MCQ Test

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