Class 9 Chemistry MCQs: Chapter 7

Structure of Atoms Notes Questions & Answers PDF Download - 4

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Structure of Atoms Test Questions and Answers PDF Download: MCQ 4

MCQ: 16

α particles are

positively charged
doubly positively charged
negatively charged
doubly negatively charged

MCQ: 17

The energy of emitted light is equal to

sum of energy levels
difference between energies of orbits
product of energies of orbits
none of above

MCQ: 18

Atoms having same atomic number but different atomic mass are called

derivatives
isotopes
elements
isomers

MCQ: 19

Rutherford bombarded thin gold foil with

α particles
β particles
γ particles
neutrons

MCQ: 20

Iodine-123 is used to

diagnose thyroid problem
image the brain
kill cancer cells
trace the blood flow

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