CBSE Class 8 Science Revision Assignment Set C

CBSE Class 8 Science - Revision (3)

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PHYSICS

1. Define the following terms

a. Latent heat of vaporization

b. Latent heat of fusion

2. Why do soft drink bottles cool better in ice than in water?

3. Why are the burns caused by steam more severe than those caused by

boiling water ?

4. When we go for vaccination, the Dr. rubs a little spirit on our skin and we immediately

feel very cool at that spot. Why?

5. Observe the given table

substance Specific heat capacity(cal/g°C)

steel 0.11

aluminum 0.21

100 g of each substance is heated from 30°C to 40°C.

a) Calculate the amount of heat required in each case

b) Which metal requires the greatest amount of heat and which one the least?

CHEMISTRY

1. Explain the formation of Oxide ion from oxygen atom. Show it as

representation in word form as well as diagrammatic form

2. Write any five common radioisotopes and their uses.

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