SSC CGL (Prelims) GK: Physics questions with solutions

Q1. Which famous experiment was done by Michael Faraday in 1831?

1. Discovery of quantum magnetometers
2. Discovery of law of elasticity
3. Discovery of electromagnetic induction
4. Discovery of natural radioactivity

Answer: Discovery of electromagnetic induction

In 1831, Michael Faraday demonstrated electromagnetic induction, showing that a changing magnetic field can induce an electric current. This was a landmark discovery in electricity and magnetism.

Q2. Ernest Rutherford used gold foil about how many atoms thick for the alpha-scattering experiment?

1. 500 atoms
2. 1000 atoms
3. 900 atoms
4. 700 atoms

Answer: 1000 atoms

Rutherford's gold foil experiment used an extremely thin gold foil so that most alpha particles could pass through it. The foil was about 1000 atoms thick. Hence, the correct answer is 1000 atoms.

Q3. Which of the following is a type of simple machine?

1. Engine
2. Gearbox
3. Pulley
4. Battery

Answer: Pulley

A pulley is a simple machine used to lift loads or change the direction of force. Engine, gearbox, and battery are not simple machines.