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Science MCQs

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Question 671 Medium

Which of the following is a chemical change?

A
Heating of zinc oxide
B
Heating of nichrome wire
C
Heating of sugar
D
Heating of water
Question 672 Medium

What is the role of oxygen in rusting?

A
It prevents rusting
B
It accelerates rusting
C
It has no role
D
It dissolves iron
Question 673 Medium

Which of the following is a product of combustion?

A
Oxygen
B
Carbon dioxide
C
Nitrogen
D
Water vapour
Question 674 Medium

What is the chemical equation for combustion of carbon?

A
C + O2 → CO2
B
C + H2O → CO2
C
CO2 → C + O2
D
C + N2 → CN2
Question 675 Medium

Which of the following is a physical change?

A
Burning of candle
B
Digestion of food
C
Freezing of water
D
Rusting of iron
Question 676 Medium

What is the solvent in a sugar solution?

A
Sugar
B
Water
C
Both
D
None
Question 677 Medium

Which of the following is a chemical property?

A
Color
B
Hardness
C
Reactivity
D
Density
Question 678 Medium

What is the main cause of acid rain?

A
Carbon dioxide
B
Sulphur dioxide
C
Oxygen
D
Nitrogen
Question 679 Medium

Which of the following is NOT a physical property?

A
Boiling point
B
Solubility
C
Flammability
D
Melting point
Question 680 Medium

What is galvanizing?

A
Painting iron
B
Coating with zinc
C
Applying oil
D
Using alloys
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