Questions & Answers HS (11th & 12th) : MCQs Science Olympiad for Class 4, Chapter - Water

Sunday, November 24, 2024

MCQs Science Olympiad for Class 4, Chapter - Water

General Properties of Water

What is the chemical formula of water?
A) H₂O
B) CO₂
C) O₂
D) HCl
Answer: A
What is the main source of water on Earth?
A) Trees
B) Oceans
C) Animals
D) Mountains
Answer: B
What is the process of water changing into vapor called?
A) Freezing
B) Evaporation
C) Condensation
D) Melting
Answer: B
What is water in its solid form called?
A) Vapor
B) Dew
C) Ice
D) Fog
Answer: C
Which property of water allows it to take the shape of its container?
A) Fixed volume
B) Solid state
C) Fluidity
D) Boiling point
Answer: C

Sources of Water

Which of the following is NOT a natural source of water?
A) River
B) Lake
C) Tap
D) Spring
Answer: C
Rainwater flows into rivers and lakes. This process is called:
A) Collection
B) Precipitation
C) Runoff
D) Filtration
Answer: C
Which of the following is an underground source of water?
A) Ocean
B) Well
C) Pond
D) Rain
Answer: B
Which source of water is salty?
A) River
B) Pond
C) Ocean
D) Spring
Answer: C
Which is the largest source of fresh water?
A) Glaciers
B) Seas
C) Oceans
D) Groundwater
Answer: A

Uses of Water

Which of these activities does NOT require water?
A) Cooking
B) Washing
C) Sleeping
D) Drinking
Answer: C
Plants need water to:
A) Grow and make food
B) Stay warm
C) Produce seeds only
D) Survive winters
Answer: A
Water is used to generate electricity in:
A) Nuclear power plants
B) Thermal power stations
C) Hydro power plants
D) Wind farms
Answer: C
Animals get water from:
A) Rivers only
B) Lakes only
C) Natural water sources like ponds, rivers, and streams
D) Oceans
Answer: C
Which industry uses the most water?
A) Textile
B) Agriculture
C) Automobile
D) Cement
Answer: B

States of Water

Water freezes at:
A) 50°C
B) 0°C
C) 100°C
D) 10°C
Answer: B
Boiling water changes into:
A) Ice
B) Steam
C) Dew
D) Fog
Answer: B
Condensation is the process of:
A) Water turning into ice
B) Water vapor turning into liquid
C) Ice turning into water
D) Liquid water turning into vapor
Answer: B
The water cycle is powered by:
A) Sunlight
B) Wind
C) Gravity
D) Moonlight
Answer: A
What happens to water when it is cooled?
A) It expands
B) It turns into steam
C) It contracts and may freeze
D) It boils
Answer: C

The Water Cycle

The process of rain formation is called:
A) Evaporation
B) Precipitation
C) Condensation
D) Melting
Answer: B
Clouds are formed due to:
A) Evaporation
B) Condensation
C) Melting
D) Freezing
Answer: B
The continuous movement of water on Earth is called:
A) Water distribution
B) Water filtration
C) Water cycle
D) Water erosion
Answer: C
What causes water to evaporate?
A) Cold air
B) Sun's heat
C) Clouds
D) Rain
Answer: B
Dewdrops on grass in the morning are an example of:
A) Evaporation
B) Condensation
C) Freezing
D) Precipitation
Answer: B

Conservation of Water

What is the method of saving water called?
A) Pollution
B) Conservation
C) Evaporation
D) Defrosting
Answer: B
Which of these is a way to conserve water?
A) Leaving taps open
B) Fixing leaks
C) Washing cars daily
D) Overusing water
Answer: B
Harvesting rainwater means:
A) Using rainwater to grow crops
B) Collecting and storing rainwater
C) Drinking only rainwater
D) Stopping rain from falling
Answer: B
Why should we conserve water?
A) To increase water bills
B) To ensure availability for future generations
C) To waste water
D) To make water scarce
Answer: B
Drip irrigation saves water by:
A) Overwatering plants
B) Delivering water directly to the roots of plants
C) Using sprinklers only
D) Blocking water flow
Answer: B

Water Pollution

Dirty water is called:
A) Salty water
B) Polluted water
C) Freshwater
D) Pure water
Answer: B
Water pollution is caused by:
A) Boiling water
B) Dumping waste into water bodies
C) Using filtered water
D) Conserving water
Answer: B
Polluted water harms:
A) Humans only
B) Animals only
C) All living beings
D) Machines
Answer: C
Which of these is a natural cause of water pollution?
A) Oil spills
B) Soil erosion
C) Factories dumping waste
D) Sewage leakage
Answer: B
How can we reduce water pollution?
A) Dumping garbage into rivers
B) Avoiding harmful chemicals near water bodies
C) Washing clothes in rivers
D) Draining factory waste into lakes
Answer: B

Miscellaneous

How much of the Earth's surface is covered by water?
A) 25%
B) 50%
C) 71%
D) 90%
Answer: C
Water that is fit for drinking is called:
A) Salty water
B) Freshwater
C) Potable water
D) Polluted water
Answer: C
The process of purifying water at home is called:
A) Evaporation
B) Sedimentation
C) Filtration
D) Condensation
Answer: C
Which gas is present in water?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Helium
Answer: A
Water stored underground is called:
A) Freshwater
B) Groundwater
C) Rainwater
D) Ocean water
Answer: B

True or False (Bonus MCQs)

Water is found only in liquid form.
A) True
B) False
Answer: B
We should always drink water from unclean sources.
A) True
B) False
Answer: B
The water cycle has no beginning or end.
A) True
B) False
Answer: A
Frozen water is denser than liquid water.
A) True
B) False
Answer: B
Oceans have more water than rivers.
A) True
B) False
Answer: A

Fill in the Blanks (MCQ Format)

Water is essential for ________.
A) Machines
B) Living beings
C) Plastic
D) Rocks
Answer: B
Water vapor in the air is called ________.
A) Fog
B) Humidity
C) Dew
D) Precipitation
Answer: B
Plants lose water through ________.
A) Photosynthesis
B) Respiration
C) Transpiration
D) Absorption
Answer: C
Boiling water makes it ________.
A) Safe to drink
B) Dirty
C) Polluted
D) Salty
Answer: A
Rivers usually flow into ________.
A) Lakes
B) Oceans
C) Springs
D) Wells
Answer: B

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