Free Water 02 Practice Test - 4th Grade
Question 1
The empty wooden bowl will float on the surface of water.
SOLUTION
Solution : A
The wooden bowl has less density when compared to water. When this bowl is placed in water, it will float.
Question 2
Water that we see in Oceans is in _____ state.
liquid
Solid
plasma
gaseous
SOLUTION
Solution : A
Oceans are large water bodies, which have water in liquid state.
Question 3
Which form of water is this?
Liquid
Solid
Gas
Melted
SOLUTION
Solution : B
Water in solid state is known as Ice and could be obtained by cooling down water below the freezing point.
Question 4
On a sunny day, Hina observed that the puddles in her garden dried up quickly. This happens due to:
Evaporation
Freezing
Solidification
SOLUTION
Solution : A
Evaporation is the process by which a liquid gets converted into gas. This process increases with the increase in the temperature.
On sunny days, the temperature is higher. Hence, water in the puddles gets evaporated to form water vapour.
Question 5
Which of the following are different forms of precipitation?
Note: This question has more than one correct answer.
SOLUTION
Solution : A, B, C, and D
Water droplets present in the atmosphere combines to form clouds. When these clouds get heavy, it generally falls back to the ground in the form of drizzle, rain, snow or hail. This processs happens due to precipitation of water.
Question 6
In which parts of sewage treatment plant, the speed of flowing sewage is adjusted such that heavier particles settle down first followed by smaller particles.
SOLUTION
Solution : C
A grit chamber adjusts the speed at which sewage flows such that the heavier paticles like stones, sand, etc. followed by smaller particles settle down to the bottom of the chamber.
Question 7
Which of the following are the sources of freshwater?
SOLUTION
Solution : A, B, and C
About 3% of the world's water is freshwater which is found in different sources like rivers, lakes, glaciers, ponds and even groundwater.
Ocean is the source of saltwater.
Question 8
About 71% of the Earth's surface is covered with water.
True
False
SOLUTION
Solution : A
71% of Earth's surface is covered with water and rest 29% with land. Out of this 71%, 97% is saltwater while only 3% is freshwater.
Question 9
The process of passing chlorine gas through water to kill germs is known as ________.
SOLUTION
Solution : B
Chlorines gas is passed through water during treatment to kill germs and make it safe for drinking and other purposes. This process is known as chlorination.
Question 10
Which of these water bodies contain salt water?
SOLUTION
Solution : A, C, and D
Oceans, seas and Salt water lakes like the Dead Sea contain water with high amount of salt (known as salt water). Rivers contain freshwater.