Electricity and Magnetism MCQ question and answer with solution

71

A bird sitting on a high tension electric wire does not get electrocuted, because

A) it has high resistance B) the body is earthed C) it does not form a closed path for the flow of current D) its feets are good insulators

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Answer & Solution

Answer: Option C

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72

The approach called 'magnetic confmement of plasma' is the scientific principle of which technique?

A) Fusion reactor B) Particle accelerators C) Giant Metrewave Radio Telescope D) Electric generator

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Answer & Solution

Answer: Option A

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73

Some pairs of devices and associated energy changes are given below.
1. Electric generator ⟺ Mechanical to electrical
2. Electric motor ⟺ Electrical to mechanical
3. Diesel engine ⟺ Light to electrical
4. Solar cell ⟺ Chemical to mechanical
Which of the above pair/s is/are correctly matched?

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

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Answer & Solution

Answer: Option A

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74

What is the relation between Power 'P', Current 'I' and Resistance 'R'?

A) $$P = \frac{{{I^2}}}{R}$$ B) P = IR² C) $$P = \frac{I}{{{R^2}}}$$ D) P = I²R

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Answer & Solution

Answer: Option D

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75

The device used for converting alternating current to direct current is called

A) Inverter B) Rectifier C) Transformer D) Transmitter

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Answer & Solution

Answer: Option B

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76

What does the diagram shows?
Electricity and Magnetism mcq question image

A) Random motion of electrons in closed circuit B) Random motion of protons in open circuit C) Random motion of atoms in open circuit D) Random motion of electrons in open circuit

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Answer & Solution

Answer: Option D

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77

The work done in two points with a potential difference of 20V is 60 J. Then the electric charge flowing between the two points is:

A) 120 C B) 1200 C C) 3 C D) 30 C

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Answer & Solution

Answer: Option C

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78

A Galvanometer can be converted into a voltmeter by connecting with it a

A) high resistance in parallel B) low resistance on parallel C) high resistance on series D) low resistance in series

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Answer & Solution

Answer: Option C

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79

According to Ohm's law, . . . . . . . . is a constant.

A) V/I B) V ÷ I C) V × I D) I × V

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Answer & Solution

Answer: Option A

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80

Assertion (A) Electric appliances with metallic body have three connections, whereas on electric bulb has a two pin connection.
Reason (R) Three pin connections reduce heating of connecting wires.

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 C

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