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Q1. Which of the following does not deplete the water table at a place?

• Increasing number of tube-wells
• Increasing deforestation
• Scanty rainfall
• Increasing snowfall

Solution

Increasing snowfall does not deplete the water table at a place.

Q2. The process in which rainwater seeps through the soil is called 

• Distillation
• Infiltration
• Recharging
• Harvesting

Solution

When the rain falls on the Earth's surface, some of the water seeps through the soil. This process is called infiltration.

Q3. Which region in India experiences flood almost every year?

• North East
• South East
• North West
• South West

Solution

Some regions in India such as the North East belt experience heavy rainfall every year leading to floods.

Q4. In Gujarat, construction of 18 check dams was being undertaken by NGO and the villagers on the river

• Saraswati
• Ganga
• Yamuna
• Rukmavati

Solution

In Gujarat, construction of 18 check dams was being undertaken by NGO and the villagers on the river Rukmavati with the aim of harvesting rainwater.

Q5. Water in the aquifers can be usually pumped out with the help of

• Tube wells
• Hose pipes
• Water tanks
• Canals

Solution

Water in the aquifers can be usually pumped out with the help of hand pumps and tube wells or drawn out through wells.

Q6. Wise and careful use of resources is called

• Recycling
• Conservation
• Reusing
• Harvesting

Solution

Conservation means not wasting the resources and maintaining their quality.

Q7. Which of the following is not a contaminant present in wastewater?

• Decayed food
• Faeces 
• Soaps and detergents
• Bacteria

Solution

Bacteria present in wastewater acts on the organic matter and decomposes it.

Q8. Which process in plants supplies oxygen continuously?

• Photosynthesis
• Respiration
• Transportation
• Excretion

Solution

Oxygen is a renewable resource because it is continuously supplied by the plants during photosynthesis.

Q9. In which of the following major states in India people suffer from drought?

• Haryana
• Punjab
• Rajasthan
• Himachal Pradesh

Solution

In some states such as Rajasthan, people suffer from drought when there is a shortage of water due to sparse rainfall.

Q10. Wastewater generated in hospitals primarily consists of

• Radioactive substances
• Acids and bases
• Plastic
• Dead debris

Solution

Wastewater from hospitals contains several types of disease-causing germs and radioactive substances used in the treatment of diseases.

Q11. Moisture in the soil indicates the presence of underground

• Air
• Water
• Minerals
• Organic matter

Solution

Moisture in the soil indicates the presence of underground water.

Q12. How much area of the Earth's surface is covered with water?

• One-third
• Two-third
• Half
• Three-fourth

Solution

Nearly, three-fourth area of the Earth's surface is covered with water. Water is found in ponds, rivers, lakes and oceans.

Q13. Without plants, there will be scarcity of (A) Food (B) Oxygen (C) Rain

• (A) and (B)
• (B) and (C)
• (A) and (C)
• (A), (B) and (C)

Solution

Plants make food by the process of photosynthesis and release oxygen. They release water vapour through transpiration. Without plants, there will be no food, no oxygen and not enough rain.

Q14. What is the freezing point of water?

• 0^oC
• 100^oC
• -100^oC
• 10^oC

Solution

When water is cooled to a temperature of 0^oC, it changes to ice. This temperature is called the freezing point of water.

Q15. The technique of watering plants by making use of narrow tubes with small holes which deliver water directly at the base of the plant is called

• Canal irrigation
• Drip irrigation
• Rooftop harvesting
• Sprinkler irrigation

Solution

The technique of watering plants by making use of narrow tubes with small holes which deliver water directly at the base of the plant is called drip irrigation.

Q16. The percentage of freshwater available on the Earth's surface is 

• 0.1%
• 0.01%
• 0.001%
• 0.0001%

Solution

On the Earth's surface, only 0.6% water is available as freshwater in the liquid form. Out of this, 0.59% is present as groundwater which is not fit for human use. Therefore, only 0.01% freshwater is readily available for human use.

Q17. Which of the following processes helps in raising the groundwater level?

• Drip irrigation
• Rainwater harvesting
• Sprinkle irrigation
• Revival of bawris

Solution

Rainwater harvesting helps in raising the groundwater level.

Q18. Which of the following rivers in Rajasthan had not been revived by water harvesting structures?

• Arveri
• Sarsa
• Jahazwali
• Luni

Solution

Except for Luni, five dried up rivers- Arveri, Ruparel, Sarsa, Bhagani and Jahazwali were revived by constructing rainwater harvesting structures.

Q19. When is 'World Water Day' celebrated every year?

• 22^nd March
• 23^rd March
• 24^th March
• 25^th March

Solution

World Water Day is celebrated on 22^nd March every year.

Q20. At some places, the groundwater may come out of the surface to form a

• Well
• Pond
• Natural spring
• Lake

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