CBSE Class 8 Science - Revision Assignments (3). Students are advised to refer to the attached assignments and practice them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents should download and give the assignments to their children for practice.
DELHI PUBLIC SCHOOL SRINAGAR
Q1. What role do the blue green bacteria play in the rice field? Are they heterotrophic or
Q2. Which one gets spoilt faster: dry flour or kneaded dough made out of it? What do you think
are the conditions required for the growth of bacteria?
Q3. What preventive measures would you take against the spread of malaria and dengue?
Q4. Why are cooking vessels made of metals and not non metals? What is meant by malleability
Q5.How does it help to have a plastic covering on the piece of iron furniture?
Q6. Name the following.
a) The compound produced when metals react with acids
b) The compound formed when sulphur reacts with oxygen
c) The non metal that catches fire when exposed to air
d) The gas that burns with a pop sound
e) The gas produced when a metal reacts with water
f) The compound formed when sulphur dioxide reacts with water
g) A metal that is non malleable at room temperature
Q7. Why biogas is considered a good fuel? What are the advantages of using this fuel?
Q8. Explain in detail the chemical history of a candle Flame.
Q9.What are fossil fuel? Give a few examples. Is wood a fossil fuel? How can animal waste be
used as a source of energy?
Q10.a) Draw a fully –labeled diagram showing the different parts of a candle flame.
b) Explain why the yellow part of the flame is luminous.
c) Why does complete combustion takes place in the non –luminous zone?
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