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Science MCQs

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Total Questions
2100
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Question 631 Hard

What is tarnishing caused by?

A
Reaction with oxygen
B
Reaction with hydrogen sulphide
C
Both
D
None
Question 632 Hard

Which of the following is a method to prevent tarnishing?

A
Exposure to air
B
Applying paint
C
Keeping in moist air
D
Using alloys
Question 633 Hard

What is the state of sulphur in the reaction: S(s) + O2(g) → SO2(g)?

A
Solid
B
Gas
C
Liquid
D
Aqueous
Question 634 Hard

Which of the following is a chemical change?

A
Heating of nichrome wire
B
Heating of zinc oxide
C
Dissolving common salt
D
Heating of sugar
Question 635 Hard

What is the role of chlorine in detergents?

A
It adds fragrance
B
It bleaches stains
C
It adds color
D
It dissolves water
Question 636 Hard

Which of the following is a physical property?

A
Acidity
B
Flammability
C
Reactivity
D
Boiling point
Question 637 Hard

What is the chemical change in digestion of food?

A
Food is broken down mechanically
B
Food is broken down chemically
C
Food is dissolved in water
D
Food is heated
Question 638 Hard

Which of the following is a product of photosynthesis?

A
Carbon dioxide
B
Oxygen
C
Water
D
Nitrogen
Question 639 Hard

What is the chemical equation for rusting?

A
Fe + O2 → FeO
B
Fe + O2 → Fe2O3
C
Fe + H2O → Fe(OH)2
D
Fe + CO2 → FeCO3
Question 640 Hard

Which of the following is a chemical property of acetylene?

A
It is a gas
B
It is flammable
C
It has a smell
D
It is colorless
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