What is not true about air?
(a) It makes the windmill rotate.
(b) It helps in the movements of aeroplanes.
(c) Birds can fly due to presence of air.
(d) It has no role in water cycle.
Correct Answer: (d) It has no role in water cycle.
Explanation: Air plays a major role in the water cycle. Air helps the water vapour to rise up to form clouds.
Related Articles
- Which of the following statements is incorrect?(a) All living things require air to breathe.(b) We can feel air but we cannot see it.(c) Moving air makes it possible to fly a kite.(d) Air is present everywhere but not in soil.
- State whether the following statements are true or false. If false, correct them.(a) Plants consume oxygen for respiration.(b) Plants produce oxygen during the process of making their own food.(c) Air helps in the movements of sailing yachts and gliders but plays no role in the flight of birds and aeroplanes.(d) Air does not occupy any space.
- What makes a balloon get inflated when air is filled in it?
- Study the following statements about ozone:(a) It is essential for breathing of living organisms.(b) It is used to disinfect water.(c) It absorbs ultraviolet rays.(d) Its proportion in air is about 3%.Which of these statements are correct?(a), (b) and (c)(b) and (c)(a) and (d)All four
- Which of the following statement about ozone is correct?A. it is essential for breathingB. it absorbs ultraviolet raysC. its proportion in air is about 3%D. it is mainly responsible for global warming
- Which of the following is not a source of air pollution?(a) Automobile exhaust(b) Burning of firewood(c) Windmill(d) Power plant
- Which of the following statements are “true”?(a) Water vapour is present in air only during the monsoon.(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.(c) The process of water changing into its vapour is called evaporation.(d) The evaporation of water takes place only in sunlight.(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
- When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of:(a) oxygen (b) carbon dioxide (c) nitrogen (d) water vapour
- If we boil water, will it become air?
- List five activities that are possible due to the presence of air.
- Which of these options are not functions of ribosomes?(i) It helps in manufacture of protein molecules(ii) It helps in manufacture of enzymes(iii) It helps in manufacture of hormones(iv) It helps in manufacture of starch molecules.(a) (i) and (ii)(b) (ii) and (iii)(c) (iii) and (iv)(d) (iv) and (i)
- A list of words is given in a box. Use appropriate words to fill up the blanks in the following statements.[Air, oxygen, wind, water vapour, mixture, combination, direction, road, bottles, cylinders] (a) The ______ makes the windmill rotate.(b) Air is a ______ of some gases.(c) A weathercock shows the _____ in which the air is moving at that place.(d) Mountaineers carry oxygen ___ with them while climbing high mountains.
- What is the speed of sound:(a) in air? (b) in water? (c) in iron?
- A non-metal A which is the largest constituent of air, when heated with H2 in 1:3 ratio in the presence of a catalyst (Fe) gives a gas B. On heating with O2 it gives an oxide C. If this oxide is passed into water in the presence of air, it gives an acid D which acts as a strong oxidising agent.(a) Identify A, B, C and D(b) To which group of periodic table does this non-metal belong?
- If there was no air on the earth, would air travel by aeroplanes, helicopters be possible?
Kickstart Your Career
Get certified by completing the course
Get Started