Electricity and Magnetism MCQ question and answer with solution

61

A liquid plane plate collector located in the northern hemisphere is usually tilted to a fixed position in front of . . . . . . . .

A) west B) east C) south D) north

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Answer & Solution

Answer: Option C

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62

If an electrical device stops working due to a malfunction in a parallel circuit then other all electric equipments-

A) will continue to work at double capacity B) will not work C) will continue to function normally D) Will continue to work at half its capacity

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Answer & Solution

Answer: Option C

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63

If the diameter of a wire is reduced to half, then what will be the value of the current flowing through the wire.

A) one fourth B) half C) double D) four times

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Answer & Solution

Answer: Option A

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64

A fuse wire must be

A) conducting and of low melting point B) conducting and of high melting point C) insulator and of high melting point D) insulator and of low melting point

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Answer & Solution

Answer: Option A

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65

"The workdone in moving a unit charge across two points of an electrical circuit" is called . . . . . . . .

A) Potential difference B) current C) powet D) resistance

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Answer & Solution

Answer: Option A

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66

The earth's magnetic field is due to

A) currents circulating inside the core B) presence of a huge magnet at its centre C) moving charges in space outside D) None of the above

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Answer & Solution

Answer: Option A

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67

Which one of the following statements regarding Ohm's law is not correct?

A) Ohm's law is an assumption that current through a conductor is always directly proportional to the potential difference applied to it B) A conducting device obeys Ohm's law when the resistance of a device is independent of magnitude and polarity of applied potential difference C) A conducting material obeys Ohm's law when the resistance of material is independent of the magnitude and direction of applied electric field D) All homogeneous materials obey Ohm's law irrespective of whether the field is within range or strong

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Answer & Solution

Answer: Option D

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68

Curie point is the temperature at which

A) matter becomes radioactive B) a metal loses magnetic properties C) a metal loses conductivity D) transmutation of metal occurs

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Answer & Solution

Answer: Option B

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69

The dimension of magnetic field intensity is-

A) IL B) I²L C) IL^-1 D) IL^-2

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Answer & Solution

Answer: Option C

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70

What would be the electric current in electric bulb from the source of 220 V. If the resistance of bulb filament is 1200 Ω?

A) 18 A B) 0.18 A C) 1.8 A D) 0.018 A

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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