Class 9 Chemistry MCQs - Chapter 7

Structure of Atoms Multiple Choice Questions (MCQ) PDF - 4

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Structure of Atoms Questions & Answers PDF Download: MCQ Quiz 4

MCQ 16: α particles are

A) positively charged

B) doubly positively charged

C) negatively charged

D) doubly negatively charged

MCQ 17: The energy of emitted light is equal to

A) sum of energy levels

B) difference between energies of orbits

C) product of energies of orbits

D) none of above

MCQ 18: Atoms having same atomic number but different atomic mass are called

A) derivatives

B) isotopes

C) elements

D) isomers

MCQ 19: Rutherford bombarded thin gold foil with

A) α particles

B) β particles

C) γ particles

D) neutrons

MCQ 20: Iodine-123 is used to

A) diagnose thyroid problem

B) image the brain

C) kill cancer cells

D) trace the blood flow

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