You have been given some mishri pieces (lumps of sugar). Suggest some ways to dissolve them quickly.

(a) physical change that can be reversed. 

Some points are given here, you can add more. (i) Do not throw used tea leaves, solid food remains, etc. in the drain. Throw them in the dustbin. (ii) Chemicals like medicines,...

Wash, peel, cut and cook the potatoes. Cooking in a small amount of water and then frying in a small quantity of oil conserves the nutrients.

Milk at higher temperature would dissolve more sugar so Ravi would win the game.

(i) By applying oil, grease, butter on it or pasting a butter paper on it. (ii) Grinding (rubbing) the surface of the glass by any abrasive material.

Hint: (1) By suspending the metal bars (2) By attracting iron filings (3) Using another magnet

Water may be removed from the salt solution by heating it on a stove or keeping it in the sun in a plate for few hours.

Snakes cannot hear the been. They dance when the been moves.

For that, first the water from the handkerchief should be squeezed out properly and then it should be kept in the sun or pressed (by iron).

Following measures could be taken to save oil:  (i) In place of using personal vehicles, we should use public transport system like buses, trains or metro trains etc.  (ii) We should prefer...