Chapter 2: Atoms Molecules & Ions - Science Mcqs for Grade 7 - Set 1

1)   Chloride ion has number of protons

a. 17
b. 18
c. 24
d. 34
Answer  Explanation 

ANSWER: 17

Explanation:
No explanation is available for this question!


2)   Smaller particles in an atom are called

a. atomic particles
b. subatomic particles
c. smaller particles
d. neutral particles
Answer  Explanation 

ANSWER: subatomic particles

Explanation:
No explanation is available for this question!


3)   Chemical symbol represents

a. chemical formula
b. molecular formula
c. structural formula
d. atomic formula
Answer  Explanation 

ANSWER: chemical formula

Explanation:
No explanation is available for this question!


4)   The number of protons in a 'carbon' atom is

a. 6
b. 11
c. 12
d. 10
Answer  Explanation 

ANSWER: 6

Explanation:
No explanation is available for this question!


5)   A modern model of an atom shows that electrons are present outside nucleus in the region of high

a. probability
b. velocity
c. speed
d. energy level
Answer  Explanation 

ANSWER: probability

Explanation:
No explanation is available for this question!


6)   "O3" is a chemical formula of

a. oxygen
b. oxides
c. ozone
d. acid rain
Answer  Explanation 

ANSWER: ozone

Explanation:
No explanation is available for this question!


7)   Ammonia molecule contains one nitrogen atom and three atoms of

a. hydrogen
b. helium
c. nitrogen
d. carbon
Answer  Explanation 

ANSWER: hydrogen

Explanation:
No explanation is available for this question!


8)   As compare to hydrogen atom, helium atom is

a. very small
b. very massive
c. medium in mass fraction
d. same in volume
Answer  Explanation 

ANSWER: very massive

Explanation:
No explanation is available for this question!


9)   The major part of an atom is

a. empty
b. filled
c. charged
d. covered
Answer  Explanation 

ANSWER: empty

Explanation:
No explanation is available for this question!


10)   Rutherford's Model explains that atom has a nucleus which is surrounded by

a. protons
b. electrons
c. neutrons
d. nuclear energy
Answer  Explanation 

ANSWER: electrons

Explanation:
No explanation is available for this question!