Electricity and Magnetism MCQ question and answer with solution

1

Who demonstrated by composition of electromagnetism and light that light is an electromagnetic wave?

A) Isaac Newton B) Carlo Rubia C) James Maxwell D) Sheldon Glashow

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Answer & Solution

Answer: Option C

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2

Which of the following causes of power loss in AC circuit generally:

A) resistance and inductor B) capacitor only C) inductor only D) resistance only

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Answer & Solution

Answer: Option D

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3

Assertion (A) The coulomb force is the dominating force in the universe.
Reason (R) The Coulomb force is stronger than the gravitational force.

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

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Answer & Solution

Answer: Option D

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4

A shop uses 250 units of energy in a month. How much energy was used in joules?

A) 9 × 10⁸ J B) 9 × 10^-8 J C) 9 × 10^-7 J D) 9 × 10⁷ J

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Answer & Solution

Answer: Option A

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5

Brightness of the bulb decreases gradually with its period of use because of

A) evaporation of metal from filament of bulb B) decreases in resistance of bulb C) decrease in electric supply to the bulb D) None of the above

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Answer & Solution

Answer: Option A

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6

Two resistors of 20 Ω are connected in parallel to each other in a circuit. Then, this combination is added with a resistance of 10 Ω in series. What will be their equivalent resistance?

A) 10 Ω B) 30 Ω C) 5 Ω D) 20 Ω

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Answer & Solution

Answer: Option D

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7

When a potential difference of 140 V applied to a resistance of 10 Ω, calculate the amount of flowing current through it.

A) 14 ampere B) 140 ampere C) 1400 ampere D) 1.4 ampere

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Answer & Solution

Answer: Option A

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8

According to the international colour code for electrical wire, which of the following options represents neutral wire.

A) Red B) Green C) Blue D) Yellow

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Answer & Solution

Answer: Option C

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9

In electric apparatus 'Earth' is used

A) To reduce the expenditure B) Because the apparatus used 3-phase C) For safety D) In the form of fuse

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Answer & Solution

Answer: Option C

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10

Ratio of voltage and direct current in a closed electric circuit:

A) remains constant B) varies C) increases D) decreases

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Answer & Solution

Answer: Option A

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Electricity and Magnetism MCQ question and answer with solution | Physics Gk MCQs