Do any seven questions (7*2=14) (i) What is pasteurisation? Why is milk pasteurised? (ii) What dop you understand by conservation? Who does it? (iii) Differentiate between biodegradable and non-biodegradable substances. (iv) Can we use sulphur instead of copper in making of electrical cables? Why? (v) State two ways to conserve LGP in the kitchen. (vi) Calcute the pressure when a force of 200N is exerted on an area of- a. 10m2 b. 5m2 (vii) Why do we feel hot when we rub our hands? (viii) List two harms of noise pollution.
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