Electricity 15 numerical-type MCQs

Which of the following statement is not true according to Ohm's law ?

• Voltage is directly proportional to resistance

• Current is directly proportional to voltage

• Resistance is inversely proportional to current

• Voltage is inversely proportional to current

If the voltage across a resistor is 12 V and the current flowing through it is 4 A, then the resistance is​ (a)   Ω

• 16
• 3
• 48
• 8

In a circuit, if the resistance is increased while keeping the voltage constant, what happens to the current?

• Remains the same

• Becomes zero

• Increases

• Decreases

A circuit has a current of 2 A flowing through it, and the resistance is 5 ohms. The voltage across the circuit is ​ (a)   V.​

• 7.5
• 5
• 10
• 2.5

If the current through a resistor is 3 A and the voltage is 9 V, then the resistance is ​ (a)   Ω.​

• 3
• 6
• 12
• 27

The power consumed by an electrical device with a voltage of 220 V and a current of 2 A is ​ (a)   W.

• 4400
• 110
• 440
• 22

If the power of a device is 120 W and the voltage is 12 V, the current flowing through it will be ​ (a)   A.

• 5
• 20
• 1
• 10

​ (a)   is not the correct formula for calculating Power.

• P = VI
• P = I^2 x R
• P = IR^2
• P = V^2/R

The unit of electric charge is:

• Watt

• Coulomb

• Ampere

• Volt

One coulomb charge is equivalent to the charge contained in ​ (a)   number of electrons.

[NOTE: Charge of an electron is 1.6 x 10^-19 C ]

• 2.6 x 10^19
• 6.2 x 10^19
• 2.65 x 10^18
• 6.25 x 10^18