Electricity and Magnetism MCQ question and answer with solution

21

Who discovered the relation between Potential difference (V) and Electric current (I)?

A) Newton B) Ohm C) Pascal D) Tesla

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Answer & Solution

Answer: Option B

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22

The inverse of resistivity is called.

A) electromagnetism B) conductivity C) counter transaction D) selectivity

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Answer & Solution

Answer: Option B

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23

A person has five resistances, each of which has a value of $$\left( {\frac{1}{5}} \right)\Omega $$ . Find the value of maximum resistance obtained by adding them.

A) $$\frac{2}{5}\Omega $$ B) 1 Ω C) $$\frac{1}{2}\Omega $$ D) 5 Ω

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Answer & Solution

Answer: Option B

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24

The resistance of a metallic wire is

A) directly proportional to its length and inversely proportional to its area of cross-section B) inversely proportional to the product of its area of cross-section and length C) inversely proportional to its length and directly proportional to its area of cross-section D) directly proportional to the product of its area of cross-section and length

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Answer & Solution

Answer: Option A

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25

A family consumes 320 units of energy in a month. How much is this energy in joules?

A) 1152 × 10⁶ joule B) 9 × 10⁸ joule C) 10 × 10⁵ joule D) 5 × 10⁸ joule

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Answer & Solution

Answer: Option A

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26

Assertion (A) It is not necessary that every bar magnet has one North Pole and one South Pole.
Reason (R) Magnetic poles occur in pair.

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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27

The frequency of direct current . . . . . . . .

A) zero B) 50 Hz C) 60 Hz D) 100 Hz

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Answer & Solution

Answer: Option A

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28

What is the rate of electrical work or the rate of expenditure of electric energy?

A) work B) stream C) potential D) power

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Answer & Solution

Answer: Option D

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29

Which of the following tips helps to maintain the potential of the conductor?

A) ammeter B) galvanometer C) cell or battery D) voltmeter

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Answer & Solution

Answer: Option C

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30

Faraday's Law of electrolysis are related to

A) the atomic number of positive ion B) the equivalent weight of electrolysis C) the atomic number of negative ion D) the velocity of positive ion

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Answer & Solution

Answer: Option B

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