Air Around Us
This test is standardised achievment test in biology suitable for the students of cbse,icse and all other boards of class 6 and also useful for the students of diferent competitions and olympiads.
Questions
Air exerts pressure in
- upward direction
- downward direction
- all directions
- north and south direction
- east and west direction
Which of the following gases is used in light bulbs?
- Neon
- Helium
- Argon
- Xenon
- Krypton
What is the full form of LPG?
- Light petrol gas
- Liquid petrol gas
- Liquefied petroleum gas
- Liquefied piped gas
- Liquid phosphorus gas
Mountaineers carry oxygen cylinders with them because____
- oxygen supports combustion.
- mountain air is very polluted.
- air becomes thinner as we go higher.
- air becomes denser as we go higher.
- there is no oxygen on the mountains.
Which of the following gases is required in the process of photosynthesis?
- Oxygen
- Water vapours
- Helium
- Carbon dioxide
- Nitrogen
Which of the following is called dry ice?
- Solid oxygen
- Solid helium
- Solid carbon dioxide
- Solid air
- Solid nitrogen
Which of the following is used to generate electricity by wind-power?
- Sail boats
- Wind mill
- Wind vane
- Balloons
- Parachutes
Which of the following gases is responsible for global warming?
- Oxygen
- Nitrogen
- Water vapours
- Carbon dioxide
- Inert gases
Which of the following property of air is used in the brake mechanisms of train?
- Work on air pressure
- Work on compressed air
- Correlate with air movements
- Runs on tyres with inflated air
- For generating energy by blowing wind
Which of the following gases is released by denitrifying bacteria?
- Oxygen
- Nitrogen
- Carbon dioxide
- Helium
- Water vapours
Which of the following is used as catalyst, during photosynthesis?
- Carbon dioxide
- Oxygen
- Water
- Chlorophyll
- Glucose
Which of the following plays an important part in the formation of coal?
- Starch of plants
- Chlorophyll of plants
- Gum and resins of plants
- Cellulose of plants
- Sucrose of the plants
How do animals, fishes and plants live without air, under water?
- The plants and animals come to the surface in regular intervals
- Aquatic plants and animals do not need air to survive
- Water contains dissolved gases which enable them to live
- They survive because of the interdependence of plants and animals
- The temperature of the water is suitable for them
Which of the following turns lime water milky?
- Oxygen
- Nitrogen
- Argon
- Carbon dioxide
- Helium
Nitrogen is utilized by plants for
- reproduction
- photosynthesis
- transpiration
- growth & development
- excretion
An animal is kept in an air tight jar. After some time, it was found that the animal was struggling to remain alive and its movements were reduced. Why?
- Humidity in the jar increased
- Carbon dioxide in the jar has decreased and oxygen has increased
- Oxygen in the jar has decreased and carbon dioxide has increased
- Both oxygen and carbon dioxide have increased
- There is no proper space in the jar
Which of the following statements is not true, regarding the properties of air?
- Air occupies space
- Air can be compressed
- Air exerts pressure
- Air has weight
- Air is a good conductor of electricity
Which of the following gases is acidic in nature?
- Oxygen
- Carbon dioxide
- Nitrogen
- Helium
- Argon
Which layer of atmosphere contains the ozone layer?
- Troposphere
- Mesosphere
- Stratosphere
- Thermosphere
- Exosphere
Which of the following statement is not true, about the balance of components in air?
- Carbon dioxide is released by respiration
- Oxygen is removed by respiration
- Nitrogen is removed by nitrogen fixation
- Carbon dioxide is removed by volcanic eruptions
- Oxygen is released by photosynthesis
The humidity of a place
- lies between 10 - 20%
- is always more than 50%
- is always less than 1%
- is always about 80%
- always varies from time to time
Which scientist discovered carbon dioxide first, in 1630?
- Van Helmont
- Antoine Lavoisier
- Carl Scheele
- Joseph Pristeley
- Daniel Rutherford
Which of the following gases protect us from the harmful ultraviolet rays of the earth?
- Carbon dioxide
- Oxygen
- Nitrogen
- Ozone
- Helium
Which of the following causes air pollution?
- Planting trees
- Taking measures to reduce smoke
- Using catalytic converters
- Burning of fuels
- Using unleaded petrol
Which of the following plays an important part while drinking a liquid with a straw?
- Humidity
- Composition of air
- Temperature
- Atmospheric pressure
- Space