Last updated on December 14th, 2023 at 08:35 am
What is the name given to a coil of wire wrapped around a piece of iron that behaves like a magnet when current passes through it?
A) Insulator
B) Fuse
C) Electromagnet
D) Conductor
Answer – (C)
How does an electric heater produce heat?
A) By converting light energy into heat
B) By converting mechanical energy into heat
C) By converting sound energy into heat
D) By passing an electric current through a coil of wire
Answer – (D)
Doctors use tiny electromagnets to remove small pieces of magnetic material from where?
A) Ear
B) Nose
C) Eye
D) Mouth
Answer – (C)
Which factors determine the amount of heat produced in a wire when an electric current passes through it?
A) Material, length, and thickness of the wire
B) Material, temperature, and color of the wire
C) Length, resistance, and color of the wire
D) Voltage, current, and resistance of the wire
Answer – (A)
What happens when the current in a circuit exceeds the safe limit with MCB installed?
A) The MCB lights up
B) The MCB becomes a conductor
C) The MCB automatically turns off
D) The MCB generates heat
Answer – (C)
Which of the following materials is NOT suitable for making an electromagnet?
A) Soft iron
B) Copper
C) Steel
D) Aluminum
Answer – (D)
In an electric circuit, what component is used to break the flow of current?
A) Bulb
B) Fuse
C) Cell
D) Switch
Answer – (D)
