Air and Water Chapter questions and Answers for Grade 4 and 5 Class students from online-shiksha.
Air and Water True or False
Air and Water Question Answers
Que: What is part of the atmosphere?
Answer: Nitrogen, oxygen, carbon dioxide and many other trace gases form the main part of the atmosphere.
Que: What does the ozone layer do in the atmosphere?
Answer: The ozone layer absorbs the harmful ultraviolet rays emanating from the Sun, which prevents them from reaching the Earth’s surface.
Que: What does the atmosphere mean for life on Earth?
Answer: The air we breathe is in the atmosphere, which helps regulate Earth’s climate and plays an important role in the water cycle.
Que: What forces maintain the atmosphere on the earth?
Answer: Gravity is the force that keeps the atmosphere around the Earth stable.
Que: How does the thickness of the atmosphere change with altitude?
Answer: The thickness of the atmosphere is greatest near the surface of the earth, but the thickness of the atmosphere decreases with height.
Que: Which gas is available in the largest amount in the Earth’s atmosphere?
Answer: Nitrogen, comprising 78% by volume, is the most abundant gas in the Earth’s atmosphere.
Que: What does oxygen do in the atmosphere?
Answer: Oxygen is necessary for respiration of living organisms to break down food and obtain energy. This combustion is also helpful.
Que: What is the contribution of carbon dioxide to the atmosphere?
Answer: Carbon dioxide is used by plants in photosynthesis, but it is also found in fire extinguishers and soft drinks.
Que: What percentage is Argon in the atmosphere?
Answer: Earth’s atmosphere is composed of about 0.93% argon.
Que: Name some small gases present in the atmosphere.
Answer: Trace gases (hydrogen, helium, methane and water vapor) make up about 0.03% of the atmosphere.
Que: What are some common daily uses of air pressure?
Answer: Air pressure is used to inflate tyres, play wind instruments, fill syringes and propel boats, windmills and kites. It is also used in inflating balloons.
Que: How much of the Earth’s surface is covered with water?
Answer: Water covers about 75% of the Earth’s surface.
Que: What is the state of the water in the Antarctic and Arctic regions?
Answer: Ice in the form of water is present in the Arctic and Antarctic regions.
Que: When the sun’s heat changes water into vapor, what is the process called?
A: Evaporation is the process by which the heat of the sun changes water into vapor.
