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

Question : Refrigerators keep food unspoiled because

Option 1: at its low temperature bacteria and moulds are inactive

Option 2: at its low temperature, the germs are killed

Option 3: at its low temperature, the germs are frozen

Option 4: it sterilizes the food

Question : Electrical conductance through metals is called electronic conductance and it ______.

Option 1: does not depend on the temperature

Option 2: decreases with an increase in temperature

Option 3: increases with an increase in temperature

Option 4: decreases with a decrease in temperature

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 : Which of the following statements is correct regarding fuse wire?

Option 1: It has a low melting point and low conductivity.

Option 2: It has a high melting point and low conductivity.

Option 3: It has a low melting point and high conductivity.

Option 4: It has a high melting point and high conductivity.