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Science MCQs

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Question 661 Medium

Which of the following is a physical property?

A
Flammability
B
Reactivity
C
Melting point
D
Acidity
Question 662 Medium

What happens when electric current is passed through water?

A
It freezes
B
It evaporates
C
It decomposes into H2 and O2
D
It turns acidic
Question 663 Medium

Which of the following is NOT a chemical change?

A
Burning of paper
B
Digestion of food
C
Dissolving sugar in water
D
Rusting of iron
Question 664 Medium

What is the chemical formula of rust?

A
FeO
B
Fe2O3
C
Fe3O4
D
FeCl3
Question 665 Medium

Which of the following is a method to prevent rusting?

A
Painting
B
Galvanizing
C
Forming alloys
D
All of these
Question 666 Medium

What is the boiling point of water?

A
0°C
B
50°C
C
100°C
D
150°C
Question 667 Medium

Which of the following is a greenhouse gas?

A
Oxygen
B
Nitrogen
C
Carbon dioxide
D
Hydrogen
Question 668 Medium

What is the state symbol (aq) in a chemical equation?

A
Solid
B
Aqueous
C
Gas
D
Liquid
Question 669 Medium

Which of the following is an example of oxidation?

A
Melting of ice
B
Combustion
C
Tarnishing
D
Both 2 and 3
Question 670 Medium

What is the melting point of ice?

A
0°C
B
100°C
C
50°C
D
-10°C
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