SSC CGL (Prelims) General: Electricity and Magnetism questions with solutions

Q1. Which of the following pairs is correctly matched regarding electromagnetic devices?

1. Electric Motor: Converts electrical energy into electrical energy
2. Transformer: Works only with direct current (DC)
3. Electromagnet: Loses magnetism when current is switched off
4. Electric Fuse: Uses magnetic effect of electric current

Answer: Electromagnet: Loses magnetism when current is switched off

An electromagnet produces magnetism only when electric current flows through it, so it loses magnetism when the current is switched off. The other options contain incorrect descriptions of the devices.