Water Resources and Their Conservation

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Code: Class8-SC1-11102026
Class: Class 8
Subject: Mathematics
Difficulty

Water Resources and Their Conservation

Question #2726
Approximately what percentage of Earth's total water is saline water, found mainly in oceans and seas?
a.
b.
c.
d.
Question #2727
Only about 3% of Earth's water is freshwater. What percentage of this freshwater is readily available as liquid freshwater in rivers, lakes, and groundwater?
a.
b.
c.
d.
Question #2728
Why does Earth appear blue when viewed from space?
a.
b.
c.
d.
Question #2729
Despite Earth having a large amount of water, why is usable freshwater considered limited?
a.
b.
c.
d.
Question #2730
Water is considered a renewable natural resource primarily because:
a.
b.
c.
d.
Question #2731
What is the consequence if people use groundwater faster than rainfall can replace it?
a.
b.
c.
d.
Question #2732
What is the primary energy source that powers the Earth's water cycle (hydrological cycle)?
a.
b.
c.
d.
Question #2733
Which process describes plants drawing water from the soil through roots and releasing excess moisture into the air through microscopic pores on leaves called stomata?
a.
b.
c.
d.
Question #2734
What happens to warm water vapor as it rises to cooler temperatures at higher altitudes during the water cycle?
a.
b.
c.
d.
Question #2735
When water droplets in clouds merge and grow heavier until air currents can no longer keep them suspended, what process occurs?
a.
b.
c.
d.
Question #2736
After precipitation falls to the ground, what are the three main ways the water moves or is stored?
a.
b.
c.
d.
Question #2737
Which of the following is an example of a surface water source?
a.
b.
c.
d.
Question #2738
How is groundwater primarily formed?
a.
b.
c.
d.
Question #2739
What are subterranean reservoirs consisting of permeable rock and sand strata, where groundwater accumulates, called?
a.
b.
c.
d.
Question #2740
What is designated as the upper boundary of the water-saturated zone underground?
a.
b.
c.
d.
Question #2741
When does water pollution occur?
a.
b.
c.
d.
Question #2742
Which of the following is an example of a 'point source' of water pollution?
a.
b.
c.
d.
Question #2743
Untreated domestic sewage discharged into rivers primarily introduces what harmful substances?
a.
b.
c.
d.
Question #2744
What type of pollutants are commonly found in industrial effluents from chemical manufacturing and metal plating plants?
a.
b.
c.
d.
Question #2745
How does excessive application of synthetic fertilizers from agricultural runoff lead to 'eutrophication' in water bodies?
a.
b.
c.
d.
Question #2746
What is the primary concern regarding solid waste and plastics in water bodies?
a.
b.
c.
d.
Question #2747
Why does thermal pollution, caused by power plants discharging hot water, harm aquatic animals?
a.
b.
c.
d.
Question #2748
What is the main purpose of a Sewage Treatment Plant (STP)?
a.
b.
c.
d.
Question #2749
What kind of facilities must factories install to remove toxic heavy metals and hazardous chemical residues from their wastewater?
a.
b.
c.
d.
Question #2750
How do vegetated buffer strips of grass and trees along field margins help control water pollution?
a.
b.
c.
d.
Question #2751
Which water conservation method involves collecting, channeling, and storing rainfall from rooftops and paved surfaces for future use or groundwater recharge?
a.
b.
c.
d.
Question #2752
What is a significant benefit of using drip irrigation in agriculture compared to conventional flood irrigation?
a.
b.
c.
d.
Question #2753
How do traditional structures like check dams and johads contribute to water conservation?
a.
b.
c.
d.
Question #2754
Which simple household habit can significantly save treated water every year?
a.
b.
c.
d.
Question #2755
What is 'greywater recycling' in the context of household water conservation?
a.
b.
c.
d.
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