Extra 40 Multiple Choice Questions (MCQs) with answers from the chapter:11 "Electricity" for Class 10 CBSE Science:
The SI unit of electric charge is:
a) Ampere
b) Coulomb
c) Ohm
d) Volt
Ans:
b) Coulomb
The flow of electric charge in a circuit is called:
a) Voltage
b) Resistance
c) Electric current
d) Power
Ans:
c) Electric current
The SI unit of electric current is:
a) Ampere
b) Volt
c) Coulomb
d) Ohm
Ans:
a) Ampere
What is the relation between charge (Q), current (I), and time (t)?
a) Q=I/
tQ
= I/
tQ
=I/t
b) Q=
ItQ
=
ItQ
=It
c) Q=I2tQ = I^2
tQ
=I2t
d) Q=
VItQ
=
VItQ
=
VIt
Ans:
b) Q=
ItQ
=
ItQ
=It
1 coulomb of charge is equal to how many electrons?
a) 6.25×10166.25 \times 10^{16}6.25×1016
b) 6.25×10186.25 \times 10^{18}6.25×1018
c) 1.6×10−191.6 \times 10^{-19}1.6×10−19
d) 9.1×10−319.1 \times 10
^{
-31}9.1×10−31
Ans:
b) 6.25×10186.25 \times 10^{18}6.25×1018
The instrument used to measure electric current is called:
a) Voltmeter
b) Ammeter
c) Galvanometer
d) Ohmmeter
Ans:
b) Ammeter
Which of the following statements about a battery is correct?
a) It stores electric current
b) It converts chemical energy into electrical energy
c) It generates heat energy
d) It produces mechanical energy
Ans:
b) It converts chemical energy into electrical energy
Which law states that the current flowing through a conductor is directly proportional to the voltage across it, provided the temperature remains constant?
a) Joule’s Law
b) Ohm’s Law
c) Kirchhoff’s Law
d) Faraday’s Law
Ans:
b) Ohm’s Law
What is the SI unit of resistance?
a) Volt
b) Ampere
c) Ohm
d) Farad
Ans:
c) Ohm
If the resistance of a conductor increases, the current flowing through it will:
a) Increase
b) Decrease
c) Remain the same
d) Become zero
Ans:
b) Decrease
What is the formula for Ohm’s Law?
a) V=IRV = IRV=IR
b) I=VRI = VRI=VR
c) R=IVR = IVR=IV
d) V=I/RV = I/RV=I/R
Ans:
a) V=IRV = IRV=IR
The resistance of a wire depends on:
a) Length of the wire
b) Cross-sectional area
c) Type of material
d) All of the above
Ans:
d) All of the above
The resistance of a wire increases when:
a) Length increases
b) Area increases
c) Temperature decreases
d) None of the above
Ans:
a) Length increases
What happens to resistance when the area of cross-section of a conductor is doubled?
a) Resistance becomes half
b) Resistance doubles
c) Resistance remains the same
d) Resistance becomes zero
Ans:
a) Resistance becomes half
What is the SI unit of resistivity?
a) Ohm-meter
b) Ohm
c) Ampere
d) Volt
Ans:
a) Ohm-meter
Which of the following materials has the lowest resistivity?
a) Copper
b) Nichrome
c) Tungsten
d) Rubber
Ans:
a) Copper
In a series circuit, the total resistance is:
a) The sum of individual resistances
b) Less than the smallest resistance
c) Equal to the reciprocal sum of resistances
d) Zero
Ans:
a) The sum of individual resistances
In a parallel circuit, the total resistance is:
a) Greater than the highest resistance
b) Less than the smallest resistance
c) The sum of individual resistances
d) Infinite
Ans:
b) Less than the smallest resistance
Which type of connection is preferred for household wiring?
a) Series
b) Parallel
c) Both a and b
d) None of the above
Ans:
b) Parallel
Why is a parallel circuit preferred for domestic wiring?
a) The voltage across all devices remains the same
b) If one appliance stops working, others continue to work
c) It allows the use of different appliances with different resistances
d) All of the above
Ans:
d) All of the above
Which of the following equations represents electrical power?
a) P=VIP = VIP=VI
b) P=I2RP = I^2 RP=I2R
c) P=V2/RP = V^2 / RP=V2/R
d) All of the above
Ans:
d) All of the above
The SI unit of power is:
a) Joule
b) Watt
c) Ohm
d) Ampere
Ans:
b) Watt
Electrical energy is measured in:
a) Joule
b) Kilowatt-hour
c) Watt
d) Ampere
Ans:
b) Kilowatt-hour
1 kilowatt-hour is equal to how many joules?
a) 3.6×1033.6 \times 10^33.6×103
b) 3.6×1063.6 \times 10^63.6×106
c) 3.6×1093.6 \times 10^93.6×109
d) 3.6×10123.6 \times 10
^{
12}3.6×1012
Ans:
b) 3.6×1063.6 \times 10^63.6×106
Which of the following appliances works on the heating effect of current?
a) Electric iron
b) Electric heater
c) Electric kettle
d) All of the above
Ans:
d) All of the above
What is the commercial unit of electrical energy?
a) Joule
b) Watt-hour
c) Kilowatt-hour
d) Ampere-hour
Ans:
c) Kilowatt-hour
What is the power of a device that consumes 1000 J of energy in 10 seconds?
a) 10 W
b) 100 W
c) 1 kW
d) 1 W
Ans:
b) 100 W
Which law governs the heating effect of electric current?
a) Joule’s Law
b) Ohm’s Law
c) Kirchhoff’s Law
d) Faraday’s Law
Ans:
a) Joule’s Law
Joule’s law of heating states that heat produced is proportional to:
a) I2I^2I2
b) R
c) t
d) All of the above
Ans:
d) All of the above
A fuse wire is made of:
a) Copper
b) Lead-tin alloy
c) Nichrome
d) Aluminium
Ans:
b) Lead-tin alloy
What is the main function of a fuse in an electric circuit?
a) To regulate current flow
b) To prevent overloading and short circuits
c) To store electric charge
d) To convert AC to DC
Ans:
b) To prevent overloading and short circuits
Which type of wire has the highest resistance?
a) Short and thick
b) Short and thin
c) Long and thick
d) Long and thin
Ans:
d) Long and thin
A 100 W electric bulb is used for 10 hours. How much electrical energy is consumed?
a) 1 kWh
b) 0.5 kWh
c) 10 kWh
d) 5 kWh
Ans:
a) 1 kWh
Which of the following statements is true for electric current?
a) It is a scalar quantity
b) It is a vector quantity
c) It does not follow Ohm’s Law
d) It is not affected by resistance
Ans:
a) It is a scalar quantity
Which of the following materials is best suited for making connecting wires?
a) Silver
b) Copper
c) Nichrome
d) Rubber
Ans:
b) Copper
Which factor does NOT affect the resistance of a conductor?
a) Length
b) Temperature
c) Colour of the conductor
d) Cross-sectional area
Ans:
c) Colour of the conductor
The reciprocal of resistance is called:
a) Voltage
b) Conductance
c) Capacitance
d) Power
Ans:
b) Conductance
Which of the following devices is used to protect electrical appliances from sudden voltage spikes?
a) Resistor
b) Transformer
c) Surge protector
d) Rheostat
Ans:
c) Surge protector
If two resistors of 4Ω and 6Ω are connected in parallel, what is the total resistance?
a) 2.4Ω
b) 4Ω
c) 10Ω
d) 5Ω
Ans:
a) 2.4Ω
A heater draws a current of 5A and operates at 220V. What is the power consumed?
a) 220W
b) 1100W
c) 44W
d) 500W
Ans:
b) 1100W
