Electricity and Magnetism MCQ question and answer with solution

21

Consider the following statements.
1. Ohm's law is not applicable at very low and very high temperature.
2. Ohm's law is applicable to semiconductor.
3. Ohm's law is not applicable to electron tubes, discharge tubes and electrolytes.
4. Conductance is the reciprocal of resistance and ismeasured in siemens.
Which of the statements given above are correct?

A) 1, 2 and 3 B) 1, 2 and 4 C) 1, 3 and 4 D) 1, 2, 3 and 4

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Answer & Solution

Answer: Option C

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22

Which of the following statement(s) is/are correct?

A) The net magnetic flux through any closed surface is zero B) Magnetic flux is a vector quantity C) Earth's magnetic poles coincide with the geographic poles D) Two magnetic field lines may intersect

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Answer & Solution

Answer: Option A

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23

Which of the following has low resistivity?

A) Nichrome B) Glass C) Ebonite D) Diamond

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Answer & Solution

Answer: Option A

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24

What is the resistivity of insulators?

A) 10⁶ Ωm to 10⁸ Ωm B) 10^-12 Ωm to 10^-17 Ωm C) 10^-8 Ωm to 10^-6 Ωm D) 10¹² Ωm to 10¹⁷ Ωm

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Answer & Solution

Answer: Option D

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25

An electric current of 0.75A flows in a filament of an electric bulb for 10 minutes. Find the amount of electric charge flowing through the current.

A) 450 C B) 225 C C) 270 C D) 240 C

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Answer & Solution

Answer: Option A

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26

A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?

A) It is connected in parallel with the main switch B) It is made mainly from silver alloys C) It must have a low melting point D) It must have a very high resistance

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Answer & Solution

Answer: Option C

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27

Consider the following statements regarding a motor car battery.
1. The voltage is usually 12V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in amperehour.
Which of the above statements are correct?

A) Only 1 and 2 B) Only 2 and 3 C) Only 3 and 4 D) Only 1 and 4

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Answer & Solution

Answer: Option D

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28

Which of the following gases is used to fill an electric bulb?

A) H₂ and N₂ B) Ar and H₂ C) N₂ and O₂ D) Ar and N₂

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Answer & Solution

Answer: Option D

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29

Assertion (A) The ferromagnetic substances do not obey Curie's law.
Reason (R) At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.

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 B

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30

The value of resistance of an absolute ammeter should be:

A) high B) low C) very low D) very high

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Answer & Solution

Answer: Option C

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