Question : Surface water is a better source of drinking water because it is poor in

Option 1: Dust

Option 2: Bacteria

Option 3: Arsenic

Option 4: Algae

Question : According to _____ law, the heat produced by an electric current is directly proportional to the resistance of the conductor, the square of the current and the time it flows.

Option 1: Hooke's

Option 2: Charles's

Option 3: Faraday's

Option 4: Joule's

Question : Water is not suitable as a calorimetric substance because it:

Option 1: has high specific heat

Option 2: is a good conductor

Option 3: has high boiling water

Option 4: low latent heat of vapourisation

Question : When a piece of stone is immersed in water, it displaces water of equal

Option 1: density

Option 2: specific gravity

Option 3: mass

Option 4: volume

Question : A pressure cooker reduces cooking time because:

Option 1: the heat is more evenly distributed

Option 2: the boiling point of the water inside is elevated

Option 3: it absorbs more heat from its flame

Option 4: the higher pressure tenderises the food