Electricity and Magnetism MCQ question and answer with solution

21

Which one of the following statements about bar magnet is correct?

A) The pole strength of the North pole of a bar magnet is larger than that of the South pole B) When a piece of bar magnet is bisected perpendicular to its axis, the North and South poles get separated C) When a piece of bar magnet is bisected perpendicular to its axis, two new bar magnets are formed D) The poles of a bar magnet are unequal in magnitude and opposite in nature

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

22

Consider the following statements.
Assertion (A): Lightning conductors prevent buildings from damages in the event of lightning strike.
Reason (R): The electric charge conduct to ground through the wire, instead of passing through the structure.
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

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

23

If the value of V/I is a constant, then what is it called?

A) Potential difference B) Electric current C) coulomb D) resistance

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

24

The SI unit of electric field is

A) NC^-1 B) NC C) CN^-1 D) NC²

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

25

When a current of 0.5A flows through a filament of the electric bulb. Then amount of electric charge flows through a circuit is 300C, Calculate the time.

A) 600 s B) 6 s C) 60 s D) 6000 s

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

26

The temperature of the filament of lighted electric bulb is generally

A) 100°C to 500°C B) 1000°C to 1500°C C) 2000°C to 2500°C D) 3000°C to 3500°C

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

27

When many resistance in a circuit are connected in series, the value of current in each resistance is:

A) increases B) decreases C) halves D) remains the same

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

28

If there is an increase in current in a circuit with 5 ohms resistance, the voltage-

A) will decrease B) will increase C) will remain the same D) will be zero

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

29

In a circuit diagram, Electricity and Magnetism mcq question image

The given symbol is used as follows:

A) A wire joint B) A battery B C) An electric bulb D) A resistor of resistance R

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

30

The value of 1 kilowatt hour is

A) 3.6 × 10⁶ J B) 3.6 × 10³ J C) 10³ J D) 10⁵ J

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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