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Science MCQs

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Total Questions
2100
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Question 1691 Easy

What does the Law of Constant Composition state?

A
Atoms can be created
B
Compounds have fixed ratios
C
Isotopes exist
D
Ions attract
Question 1692 Easy

Water (H₂O) always has?

A
1 H and 2 O
B
2 H and 1 O
C
3 H and 1 O
D
1 H and 1 O
Question 1693 Easy

Which is a monoatomic molecule?

A
O2
B
H2
C
He
D
H2O
Question 1694 Easy

Which is a diatomic molecule?

A
Ne
B
O2
C
CO2
D
H2O
Question 1695 Easy

What is the valency of carbon?

A
1
B
2
C
3
D
4
Question 1696 Easy

How many electrons can the N-shell hold?

A
2
B
8
C
18
D
32
Question 1697 Easy

Which particle is removed when a glass rod becomes positively charged?

A
Protons
B
Neutrons
C
Electrons
D
Ions
Question 1698 Easy

What is the charge of a proton?

A
1
B
-1
C
Zero
D
2
Question 1699 Easy

What is the charge of an electron?

A
1
B
-1
C
Zero
D
-2
Question 1700 Easy

What is the charge of a neutron?

A
1
B
-1
C
Zero
D
2
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