Electricity and Magnetism MCQ question and answer with solution

11

Which of the following statements regarding electric motors is incorrect?

A) Electric energy is converted into mechanical energy in electric motor B) Direct current and universal electric motor These are types of electric motor C) Electric motors are driven only by direct current D) Electric motors work through the interaction between the electric fields and currents to generate force

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Answer & Solution

Answer: Option C

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12

Which direction does the thumb represent in Fleming's right hand rule?

A) flux direction B) direction of induced EMF C) The direction of motion of the conductor, if the index finger is along the lines of the finger flux D) The direction of motion of the conductor if the index finger is towards the direction of the emf generated

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Answer & Solution

Answer: Option C

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13

Kilowatt Hour (kWh) represents the unit of which of the following?

A) Electrical Power B) Force C) Momentum D) Energy

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Answer & Solution

Answer: Option D

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14

Which of the following is measured in the unit called Gauss?

A) Radius of the nuclei B) Magnetic induction C) Marine depth D) Force

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Answer & Solution

Answer: Option B

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15

If electric charge flows through any point of a circuit in 1 second is 20 coulombs. Find the value of electric current flowing through it-

A) 10 amperes B) 20 amperes C) 5 amperes D) 15 amperes

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Answer & Solution

Answer: Option B

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16

A fuse protects an electric circuit from

A) converting one form of energy into other B) inducing current C) overloading D) carrying current

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Answer & Solution

Answer: Option C

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17

How much current an electric heater coil will drawn from a source of 220 V. If the resistance of the coil is 100 ohms?

A) 22 C B) 2.2 A C) 2.2 C D) 22 A

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Answer & Solution

Answer: Option B

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18

A fuse wire is made of an alloy of

A) tin and copper B) tin and lead C) tin and aluminium D) nickel and chromium

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Answer & Solution

Answer: Option B

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19

An electric bulb of 60 W is used 6 h per day. Calculate the energy used by the bulb in one day.

A) 36 units B) 0.36 unit C) 3.6 unit D) 0.036 unit

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Answer & Solution

Answer: Option B

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20

The potential difference between the terminals of an electric heater is 60V when it draw of current of 4A from the source. What current will the heater draw if the potential difference is increased to 157.5 V?

A) 10.5 A B) 12 A C) 24 A D) 8.5 A

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Answer & Solution

Answer: Option A

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