✅Chemistry
⏩ About atomic theory, along with their answers:

1. Who proposed the first atomic theory based on philosophical reasoning?

a) Albert Einstein
b) John Dalton
c) Ernest Rutherford
d) Niels Bohr
Answer: b) John Dalton


2. According to John Dalton's atomic theory, atoms are:

a) Indivisible and indestructible particles
b) Made up of protons, neutrons, and electrons
c) Composed of positively charged protons and negatively charged electrons
d) Always in motion around the nucleus
Answer: a) Indivisible and indestructible particles


3. Who discovered the electron and proposed the plum pudding model of the atom?

a) Ernest Rutherford
b) J.J. Thomson
c) Niels Bohr
d) Marie Curie
Answer: b) J.J. Thomson


4. Which scientist's experiment led to the discovery of the atomic nucleus?

a) J.J. Thomson
b) Niels Bohr
c) Ernest Rutherford
d) Max Planck
Answer: c) Ernest Rutherford


5. According to Bohr's model of the atom, electrons:

a) Move in random orbits around the nucleus
b) Move in circular orbits at fixed energy levels
c) Move in continuous orbits with varying energy
d) Move at the speed of light around the nucleus
Answer: b) Move in circular orbits at fixed energy levels