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