SET-A
Q1. Why is the colour of clear sky blue ?
Q2. Why are bacteria and fungi called decomposers ?
Q3. Why is decrease of ozone in our ozone layer a cause for our worry ?
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SET-B
Q1. How many covalent bonds are there in a molecule of ethane C2H6 ?
Q2. What is Tyndall effect ?
Q3. What will happenif we kill all the organisms in one trophic level ?
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SET-C
Q1. Draw the structure for ethanoic acid molecule, CH2COOH. ?
Q2. What is meant by biological magnification ?
Q3. Give an example of a phenomenon where Tyndall effect can be observed ?
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CBSE Class X Sample Papers
| English Communicative -2011 | English Language and Literature -2011 | Maths -2011 |
| Science -2011 | S.S.T -2011 | Foundation of IT -2011 |
Entrance Exams 2012