Question

If you have 5 ml of kerosene or petrol and there are five different

conditions .These conditions are as follows:

(i) Take kerosene or petrol in a test tube and place it under a fan or

near a window.

(ii) Take kerosene or petrol in an open china dish and keep it under a

fan or near a window.

(iii) Take kerosene or petrol in an open china dish and keep it inside

a cupboard or on a shelf in your class.

(iv) Take kerosene or petrol in an open china dish and put it outside

in sun.

(v) Take kerosene in a closed bottle.

Question – what do you notice about the following aspects of

evaporation?

(a) Effect of surface area

(b) Effect of wind velocity

(c) Effect of temperature by combining result of step 1 to 4.

……….. (3)

Q2. A few substance are arranged in the increasing order of ‘forces

of attraction’ between their particles. Which one of the following

represents a correct arrangement?

(a) water,air,wind (b) air , sugar, oil (c) oxygen, water ,sugar

(d) salt, juice air ​

Answer 1

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