Water quiz

The change of water into water vapour is called:

Clouds are formed by:

Plants release water vapour into the air by:

Water falling from clouds as rain, hail or snow is called:

Which of the following increases evaporation?

A long period with no rainfall causes:

Water stored under the ground is called:

Water droplets on the outside of a glass of ice water come from:

Rooftop rainwater harvesting helps to:

Most of the water on Earth is found in:

Why do wet clothes dry faster on a windy day? (2 marks)

How is salt obtained from sea water? (2 marks)

Why does the water level in ponds go down in summer? (2 marks)

What is the role of the Sun in the water cycle? (2 marks)

Give two harmful effects of floods. (2 marks)

Give two effects of drought on people and animals. (2 marks)

Why do we see water droplets on window panes on cold winter mornings? (2 marks)

Why should we not leave the tap running while brushing teeth? (2 marks)

What is a bawri? How did it help people in the past? (2 marks)

How do trees help in bringing rain? (2 marks)

A person takes a shower for 10 minutes and the shower uses 12 litres per minute. Another uses a bucket of 20 litres. How much more water does the shower use? (3 marks)

A school has 800 students. If each student saves 2 litres of water a day by closing taps properly, how much water is saved in a day and in 25 school days? (3 marks)

A water tank holds 2400 litres. A family uses 400 litres a day. How many days will a full tank last? If they reduce use by 25 percent, how many days will it last? (3 marks)

A roof of 50 square metres gets 0.8 m of rain in a year. Find the volume of rainwater in litres (1 cubic metre = 1000 L). If 75 percent is collected, how much is harvested? (3 marks)

A plate with 100 mL of water lost 20 mL in an hour in the sun and 8 mL in an hour in the shade. How much more water evaporated in the sun? At these rates, how long will the water take to dry completely in the sun? (3 marks)

Read the passage and answer the questions. Ravi boiled water in a pan and held a cold steel plate above it. After a few minutes, he saw water drops on the lower side of the plate, which then fell back into the pan. (i) Which process produced the steam? (ii) Why did water drops form on the plate? (iii) Which part of the water cycle does this activity model? (5 marks)

Read the passage and answer the questions. A village in Rajasthan gets very little rain. People there collect rainwater from rooftops in underground tanks called tankas. They use this water carefully throughout the dry months. (i) Why do the villagers collect rainwater? (ii) What is this practice called? (iii) Give one more traditional method of water harvesting. (5 marks)

Read the passage and answer the questions. In July, heavy rains fell continuously for a week in Assam. Rivers overflowed, fields were submerged and many people had to move to relief camps. (i) Name the natural disaster. (ii) Give two harmful effects of this event. (iii) How can such damage be reduced? (5 marks)

Read the passage and answer the questions. Meena's school has a garden. The gardener noticed that if the plants were covered with polythene bags on a sunny day, drops of water collected inside the bags. (i) Where did the water come from? (ii) Name the process. (iii) How does this process help the water cycle? (5 marks)

Read the passage and answer the questions. The water level in the handpumps of a town has gone down. Earlier, water was found at 20 m depth, but now one has to dig 50 m. Many new buildings have concrete floors everywhere. (i) By how many metres has the water level gone down? (ii) How do concrete floors reduce groundwater? (iii) Suggest two ways to improve groundwater levels. (5 marks)

Draw a labelled diagram of the water cycle. Explain evaporation, transpiration, condensation and precipitation and how water returns to oceans and the ground. (6 marks)

Describe activities to show evaporation and condensation. Draw diagrams and explain the observations. Give two examples of each from daily life. (6 marks)

Explain the causes and effects of floods and droughts. Draw a flowchart showing how cutting trees can lead to both floods and droughts. (6 marks)

Draw a labelled diagram of rooftop rainwater harvesting. Explain how it works, its advantages, and two other methods of harvesting rainwater. (6 marks)

Explain why water conservation is necessary. Suggest six ways to save water at home and school, and draw a poster with a slogan to save water. (6 marks)