Electricity and Magnetism MCQ question and answer with solution

51

Which of the following substances has the highest resistivity?

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

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Answer & Solution

Answer: Option A

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52

The resistance of an ideal voltmeter is

A) zero B) infinite C) high D) low

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Answer & Solution

Answer: Option B

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53

X-rays are . . . . . . . . waves.

A) longitudinal B) transverse C) electromagnetic D) elastic

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Answer & Solution

Answer: Option C

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54

A current of 0.8 A is drawn by a filament of on electric bulb for 3 minutes. Amount of electric change that flows through the circuit is . . . . . . . .

A) 1.44 B) 144 C) 14.4 D) 0.144

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Answer & Solution

Answer: Option B

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55

Electromagnet is constructed with which of the following?

A) Steel B) Soft Iron C) Aluminium D) Nickel

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Answer & Solution

Answer: Option B

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56

A current of 5A is taken by a filament for 10 minutes. Find the amount of electric charge flowing through the circuit.

A) 3000 C B) 30 C C) 5 C D) 350 C

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Answer & Solution

Answer: Option A

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57

A rectangular coil of copper wire is rotating in a magnetic field. The direction of the induced current changes once in each?

A) Two revolutions B) One revolution C) Half revolution D) One fourth revolution

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Answer & Solution

Answer: Option C

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58

Assertion (A): Light Emitting Diode (LED) lamps offer longer service life as compared to Compact Fluorescent Lamps (CFL).
Reason (R): Light Emitting Diodes (LED) lamps are more energy efficient as compared to the Compact Fluorescent Lamps (CFL).
Select the correct answer:

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 A

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59

Electric current is equals to

A) $$l = \frac{\Omega }{t}$$ B) $$l = \frac{Q}{t}$$ C) $$l = \frac{\pi }{t}$$ D) $$l = \frac{W}{t}$$

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Answer & Solution

Answer: Option B

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60

Which is the gas inside an electric bulb?

A) Argon B) Nitrogen C) Carbon dioxide D) Both A and B

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Answer & Solution

Answer: Option D

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