Electricity and Magnetism

Free sample questions

Electricity and Magnetism — sample Science questions with answers

1. Question 1

   What happens when two objects charged with the same type of charge are brought close together?

   • ABoth objects will attract each other.
   • BBoth objects will repel each other.
   • CBoth objects will not experience any force.
   • DThe charges on both objects will become neutral.

   Answer: B. Both objects will repel each other.

   Like charges repel each other.

2. Question 2

   What is the SI unit of electric current?

   • AVolt ($\text{V}$)
   • BAmpere ($\text{A}$)
   • COhm ($\Omega$)
   • DWatt ($\text{W}$)

   Answer: B. Ampere ($\text{A}$)

   Electric current is measured in amperes ($\text{A}$).

3. Question 3

   In a series circuit, if one bulb burns out, what will happen to the other bulbs?

   • AThe other bulbs will glow brighter.
   • BThe other bulbs will glow with the same brightness.
   • CThe other bulbs will go out.
   • DThe other bulbs will glow but dimmer.

   Answer: C. The other bulbs will go out.

   In a series circuit, current flows only through one path. If one bulb burns out, the circuit becomes open and all bulbs will go out.

4. Question 4

   Which material is a good conductor of electricity?

   • APlastic
   • BWood
   • CIron
   • DRubber

   Answer: C. Iron

   Metals such as iron are good conductors of electricity because they have many free electrons.

5. Question 5

   What is the function of a fuse in a household electrical circuit?

   • AReducing voltage
   • BPreventing short circuits and overcurrent
   • CIncreasing the number of bulbs
   • DIncreasing resistance

   Answer: B. Preventing short circuits and overcurrent

   A fuse will melt when the current exceeds a certain value, protecting the circuit from damage due to overcurrent or short circuits.