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Electricity & Magnetism MCQs with Answers

Includes 20 past paper MCQs (marked).

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Electricity & Magnetism MCQs (251–260)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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251.
The magnets made of iron are temporary magnets, while the magnets made of are permanent magnets.
Correct Answer: B. Steel
One-liner
Magnets made of steel are permanent magnets because steel retains magnetism for a long time, unlike soft iron which loses magnetism quickly.
252.
Two resistances of 6 Ω and 12 Ω are connected in parallel. Their net resistance is ?
Correct Answer: C. 4 Ω
One-liner
The net (equivalent) resistance of 6 Ω and 12 Ω in parallel is 4 Ω.
253.
Which device is used to increase voltage?
Correct Answer: B. Step-up transformer
One-liner
A step-up transformer is the device used to increase voltage from a lower level to a higher level.
254.
The electricity from a cell is called?
Correct Answer: C. Direct Current (DC)
One-liner
The electricity from a cell is called Direct Current (DC).
255.
If the distance between two charges doubles, the Coulomb's force between the charges _?
Correct Answer: A. Becomes one-fourth
One-liner
If the distance between two charges doubles, the Coulomb's force becomes one-fourth of the original force.
256.
Ohm's law states that in a closed circuit current is proportional to the _ and inversely proportional to the _?
Correct Answer: C. Voltage, resistance
One-liner
Ohm's law states that current (I) is directly proportional to voltage (V) and inversely proportional to resistance (R), expressed as I = V/R.
257.
The working principle of a Transformer is?
Correct Answer: C. Mutual induction
One-liner
The working principle of a transformer is Mutual induction.
258.
Holes can exist in?
Correct Answer: C. Semi-Conductors
One-liner
Holes (absence of electrons) can exist in Semi-Conductors as they are the primary charge carriers in p-type semiconductors.
259.
The principle of transformer is _?
Correct Answer: A. Mutual induction
One-liner
The principle of a transformer is mutual induction, where a changing current in one coil induces an EMF in a neighboring coil through a shared magnetic field.
260.
A/an provides a complete path for the current to flow through.
Correct Answer: D. Closed Circuit
One-liner
A closed circuit provides a complete, unbroken path for electric current to flow through.

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Electricity & Magnetism MCQs with Answers

Electricity & Magnetism MCQs (251–260)

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