[1] Fill in the blanks :- [Practice Questions For Chapter: Air around Us ]
1. Air occupies _________________________. 2. Harmful gases and smoke in the air causes _________________________. 3. The _______________________ and ______________________ within the nasal passage prevents entry of dust particles into our respiratory system. 4. Air helps in _________________________ of sound. 6. Air is really not one substance but a __________________. 7. The component of air that supports burning is called ________________. 8. The aquatic animals use dissolved Oxygen in water for respiration, this is possible because Oxygen ________________ in water. 9. Nitrogen of the air is used on a large scale to manufacture ________________. 10. ________________ is the place in nature for gaseous exchange. [2] Choose the correct answer :- 1. The height of the atmosphere is (120 km/240km) 2. The volume of oxygen (increases/decreases) with increase in altitudes. 3. (Carbondioxide/Oxygen) is taken in by the plants for photosynthesis. 4. Air contain approximately (78 percent/80 percent) of Nitrogen. [3] II. True or False statements : 1. Air is a compound but not an element. 2. Air is an opaque material. 3. Air contains water vapour. 4. The major part of air is Nitrogen. 5. Plants produce Oxygen through photosynthesis. [4] Name the following :- 1. The two scientists who proved air is a mixture of gases : 2. The lightest gas in the air. 3. The gas essential for combustion and respiration. 4. The substance in presence of which photosynthesis takes place : [5] Define the following :- (a) Atmosphere (b) Respiration
11 Comments
prasen
28/12/2015 03:12:24 pm
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thillai
11/2/2014 11:39:28 am
nice
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prasen
28/12/2015 03:10:30 pm
super
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prasen
28/12/2015 03:11:14 pm
will you say answer
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prasen
28/12/2015 03:13:36 pm
will you say objectives answers please
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Hetal Amin
4/2/2018 02:06:51 pm
Pl.ans the practice questions Air around Us
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Pinal
5/2/2018 05:18:35 pm
Please send solution 6th Science practice questions Air around Us
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