Subject- Science ( Semi English)
Std-6th. J.V.Sonambe.
SELF STUDY SERIES
विद्यार्थी मित्रांनो,
खाली दिलेला स्वाध्याय नीट वाचा व आपल्या पुस्तकात पाहून उत्तरे लिहा.कोणतेही गाईड व व्यवसाय पुस्तिकांचा आधार घेऊ नका.
1) Air water and land are the factors important for sustaining the living world on the earth and for fulfilling their basic needs they are called .......
2) the .... Is the layer of air that surrounds the earth
3) the four layers of the earth i)....
ii)......iii)......iv).....
4) the proportion of land is......%
5) the proportion of water is.....%
6) the proportion of oxygen in the air is....%
7) the proportion of nitrogen in the air is.......%
8) the proportion of carbon dioxide in the air is.......%
9) the air in the atmosphere around the earth contains i) .....ii).....iii).......iv).......v)......vi)......vii)......viii).....
10) five layers of the atmosphere i)t....ii) s......iii)m.....iv) i.......v) e.......
11) the gases are not found in the...... and beyond
12) the troposphere contains .....of the total mass of gases in the air
13) stratosphere contains...... of the total mass of gases in the air
14) write the name of gas
i) helps living things to build the necessary proteins.......
ii) necessary for respiration in living things.....
iii) plants use it for producing their food....
iv) used in electric bulbs....
v) used for generating lift in airship.....
vi) used in decorative lights....
vii) used in fluorescent tubes..,.
viii) used in flash photography.......
15) harmful substances released in air through combustion of fuels i).....ii)......iii).....iv).......v).......
16) there is a layer of ozone (O3 )gas in the lower part of.......
17) the ultra violet rays coming from the sun are very harmful for living things the .....gas absorbs these rays.
18) the ozone layer is destroyed if chemical gases like carbon tetrachloride or the chlorofluorocarbons used in.... and..... mix with the air
19) the 16th of September is celebrated as..... all over the world
20) we need to drink ....to.... litres of water everyday
21) if hydrogen gas burns in air it combines with oxygen and ......is formed
23) water is a .....solvent
24) ......is life
25) water on the earth is regulated through......
26) stored water does not become ......at once
27) all ......animals including man live on land.
28) land is an important......
29) if the land has mature soil the top most layer is formed by the decomposition of the remains of plants and animals this layer is called.........
30) the..... and the....... of soil are both determined by the bedrock
31) the soil on the land is formed by a...... process
32) it takes about a thousand years for a....... thick layer of mature soil to form.
33) layers of land i).....ii).....iii).......iv).......v).........
34) the elements available in nature which fulfills the basic needs of living things are called......
35) soil has ......and..... constituents.
36) the ozone layer is a...... of the earth.
37) examples of the fossil fuel i)......ii)......iii)......iv).......v)........vi).....
38) we get fuel like petrol ,diesel, kerosene, paraffin and other useful materials like tar and wax from the fossil fuel called.....oil.
39) we cannot use all the water on earth because seawater is.......
40) the proportion of portable water/ fresh water on Earth is...…%
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