Structure of Atom

9th chemistry chapter 2 solved exercise MCQs

1. Which one of the following results in the discovery of proton ?

(a) cathode rays

(b) canal rays 🗸

(c) X-rays

(d) alpha rays

2. Which one of the following is the most penetrating ?

(a) protons

(b) electrons

(c) neutrons 🗸

(d) alpha particles

3. The concept of orbit was used by :

(a) J.J Thomson

(b) Rutherford

(c) Bohr 🗸

(d) Plank

4. which one of the following shell consists of three subshells ?

(a) O shell

(b) N shell

(c) L shell

(d) M shell 🗸

5. Which radioisotope is used for the diagnosis of tumor in the body ?

(a) cobalt-60

(b) iodine-131 🗸

(c) strontium-90

(d) phosphorus-32

6. When U-235 breaks up , it produces :

(a) electrons

(b) neutrons 🗸

(c) protons

(d) nothing

7. The p-subshell has :

(a) one orbital

(b) two orbital

(c) three orbital 🗸

(d) four orbital

8. Deuterium is used to make :

(a) light water

(b) heavy water 🗸

(c) soft water

(d) hard water

9. The isotope C-12 is present in abundance of :

(a) 96.9 %

(b) 97.6 %

(c) 99.7 %

(d) none of these 🗸

10. Who discovered the proton ?

(a) Goldstein 🗸

(b) J.J. Thomson

(c) Neil Bohr

(d) Rutherford

9th Chemistry, Chapter 2, Structure of Atom , Solved exercise short questions , free notes