Questions
_____________ is not ideally a constituent of air.
- Oxygen
- Nitrogen
- Carbon monoxide
- Water vapour
- Carbon dioxide
During photosynthesis, which gas is consumed and which is released by plants?
- Carbon dioxide and oxygen
- Oxygen and carbon dioxide
- Carbon dioxide and nitrogen
- Nitrogen and oxygen
- Argon and nitrogen
Two labourers died due to asphyxiation when they placed a burning angeethi in their room while sleeping.
Which of the following causes asphyxiation?
- Lack of nitrogen
- Lack of oxygen
- Plenty of oxygen
- Lack of carbon dioxide
- Plenty of helium
Trisha's father bought her a gas balloon, but as her grip loosened, the balloon flew away.
Which of the following gases was used in the balloon?
- Oxygen
- Carbon dioxide
- Helium
- Liquefied petroleum gas
- Carbon monooxide
__________ will not add pollutants to the air.
- Smoke from factories
- Irrigating farmland
- Manufacturing of paints
- Burning of wood
- Use of insecticides
Nitrogen is one of the useful gases. Which of the following statements is not a correct?
- Nitrogen is used in slowing down the process of combustion.
- It dilutes the concentration of oxygen.
- Nitrogen is used in the manufacture of ammonia.
- Aquatic plants use dissolved nitrogen for respiration.
- Nitrogen is required in plants and is part of chlorophyll pigment.
___________ is the lightest gas in the air.
- Hydrogen
- Helium
- Ammonia
- Neon
- Methane
Mountaineers carry oxygen cylinders with them. What is the main reason to do so?
- Volume of oxygen increases with the altitude.
- Volume of oxygen decreases with the altitude.
- Due to the presence of nitrogen on high altitudes
- As the air becomes thick at high altitudes, breathing becomes difficult.
- Due to the presence of poisonous gases at high altitudes
Why should we breathe from our nose and not from our mouth?
- Becaus fFine hair and mucus present inside the nose prevent dust particles from getting into the respiratory system.
- Becaus we loose more water during expiration when we use our nose for breathing.
- Because our nose purifies the oxygen and the mouth does not purify oxygen.
- Because we can breathe more from our nose because of the shorter pathway of air and larger diameter as compared to the mouth.
- None of the above
Which of the following statements is/are incorrect?
(a) We can see and feel air.
(b) Atmosphere is essential for life on earth.
(c) Oxygen is not necessary for burning and breathing.
(d) Plants and animals exchange air and are interdependent on each other.
- a and b
- b and d
- a and c
- c and d
- a and d
Why is oxygen, in its purified form, used in hospitals?
- For artificial respiration
- For burning of medical waste
- Oxygen is used in providing pneumatic pressure in medical equipments.
- Decomposition of bodies
- To clean medical equipment
Which of the following body parts is used by fishes for respiration?
- Skin
- Gills
- Scales
- Fins
- Liver
The atmosphere is made up of four layers. Which of the following is not a layer of the atmosphere?
- Troposphere
- Thermosphere
- Stratosphere
- Mesosphere
- Biosphere
Which of the following is/are the usage(s) of air?
- Air helps in the movements of sailing yachts, gliders, parachutes and aeroplanes.
- Birds, bats and insects can fly due to the presence of air.
- Air is used by humans and other living beings for respiration.
- Air plays an important role in water cycle.
- All of the above
Match the following.
| a. Nitrogen | 1. Mixture of gases |
| b. Carbon dioxide | 2. Major part of air |
| c. Air | 3. Burning of fuels |
| d.Pollution | 4. Used by plants to make food |
- a - 1, b - 2, c - 3, d - 4
- a - 4, b - 3, c - 2, d - 1
- a - 2, b - 4, c - 1, d - 3
- a - 2, b - 4, c - 3, d - 1
- a - 4, b - 2, c - 1, d - 3