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.
(a) The wind makes the windmill rotate.
(b) Air is a mixture of some gases.
(c) A weathercock shows the direction in which the air is moving at that place.
(d) Mountaineers carry oxygen cylinders with them while climbing high mountains.
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- Why it is necessary for mountaineers climbing high mountains to carry oxygen cylinders are with them?
- Mountaineers carry oxygen cylinders with them because(a) there is no oxygen on high mountains(b) there is deficiency of oxygen on mountains at high altitude(c) oxygen is used for cooking(d) oxygen keeps them warm at low temperature.
- Fill in the Blanks:The air is a ______________ of gases, dust particles, and water vapour.
- Make sentences using the given set of words.(a) 99%, oxygen, nitrogen, air, together(b) Respiration, dissolved, animals, air aquatic(c) Air, wind, motion, called
- The mountaineers carry oxygen with them because:(a) At an altitude of more than 5 km there is no air.(b) The amount of air available to a person is less than that available on the ground.(c) The temperature of air is higher than that on the ground.(d) the pressure of air is higher than that on the ground.
- Consider the following statements and choose the correct one:(a) We know that air or atmosphere always contains some water vapour or moisture in it.(b) Humidity is a measure of water vapour or moisture in air.(c) When the amount of water vapour in the air is high, we say humidity is high and the air feels moist or damp.(d) All the above.
- Which of the following is a mixture ?Salt, Air, Water, Alum, Sugar
- Explain why mountaineers carry oxygen cylinders with them?
- Which of the following is not a component of the abiotic environment?(A) Soil (B) Mountains (C) Plants (D) Air
- Which of the following is not a mixture?(a) kerosene (b) air(c) alcohol (d) petrol
- What is the percentage of oxygen in air?
- Which of the following raw materials is available in the air for photosynthesis?(a) Oxygen(b) Carbon dioxide(c) Nitrogen(d) Hydrogen
- Fill the missing word in the blank spaces in the following statements:$(a)$. Wind is——————air.$(b)$. Winds are generated due to——————heating on the earth.$(c)$. Near the earth’s surface __________air rises up whereas___________ air comes down.$(d)$. Air moves from a region of ——— pressure to a region of—— pressure.
- Fill in the blanks: The____ of air is dependent on the temperature of air
- 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.
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