Chapter 7: Structure of Atoms Chemistry Mcqs for High School - Grade 9 - Set 1

1)   If n = 3 we are in

a. K shell
b. L shell
c. M shell
d. F shell
Answer  Explanation 

ANSWER: M shell

Explanation:
No explanation is available for this question!


2)   Water that contains H-2 atoms is called

a. heavy water
b. light water
c. pure water
d. chlorinated water
Answer  Explanation 

ANSWER: heavy water

Explanation:
No explanation is available for this question!


3)   Electron revolves around the nucleus in orbits which have

a. variable energy
b. fixed energy
c. infinite energy
d. zero energy
Answer  Explanation 

ANSWER: fixed energy

Explanation:
No explanation is available for this question!


4)   In Rutherford's experiment, α particles were deflected because of

a. electrostatic repulsion between α particles and positively charged part of atom
b. electrostatic attraction between α particles and positively charged part of atom
c. electrostatic repulsion between β particles and positively charged part of atom
d. electrostatic attraction between γ particles and positively charged part of atom
Answer  Explanation 

ANSWER: electrostatic repulsion between α particles and positively charged part of atom

Explanation:
No explanation is available for this question!


5)   The energy of an electron in orbit is proportional to

a. distance between shells
b. distance from nucleus
c. distance between two nuclei
d. positive charge inside nucleus
Answer  Explanation 

ANSWER: distance from nucleus

Explanation:
No explanation is available for this question!


6)   According to Rutherford, most of the space occupied by the atom is

a. filled
b. partially filled
c. empty
d. none of above
Answer  Explanation 

ANSWER: empty

Explanation:
No explanation is available for this question!


7)   The electronic configuration is the arrangement of electrons in

a. nucleus
b. shells
c. sub-shells
d. all of above
Answer  Explanation 

ANSWER: sub-shells

Explanation:
No explanation is available for this question!


8)   Electrons revolve only in those orbits with angular momentum as an

a. half integral multiple of 'h'
b. integral multiple of 'h'
c. integral multiple of h ⁄ 2π
d. half integral multiple of 2π
Answer  Explanation 

ANSWER: integral multiple of h ⁄ 2π

Explanation:
No explanation is available for this question!


9)   After 3s the sub-shell begin to fill is

a. 3p
b. 3d
c. 3f
d. 4s
Answer  Explanation 

ANSWER: 3p

Explanation:
No explanation is available for this question!


10)   When an electron jumps from lower orbit to higher orbit

a. light is emitted
b. electrons are emitted
c. electrons are absorbed
d. light is absorbed
Answer  Explanation 

ANSWER: light is absorbed

Explanation:
No explanation is available for this question!