Question : At room temperature and atmospheric pressure, ______ has a density of 1.87 kg/m3, which is 1.5 times heavier than air and exists as a liquid below the critical temperature of 31°C.

Option 1: carbon dioxide

Option 2: nitrogen

Option 3: hydrogen

Option 4: lithium

Question : Pressure cooker cooks faster because:

Option 1: The boiling point decreases with the rise in pressure.

Option 2: It cooks the food at low pressure.

Option 3: A higher temperature is attained for cooking.

Option 4: The material of the cooker is a good conductor.

Question : Which one of the following statements about pyrolysis, which is a process for solid waste treatment, is incorrect?

Option 1: It converts the waste into solids, liquids and gases, of which the resultant liquids and gases can be used to produce energy.

Option 2: The process occurs at a temperature above 430^oC at atmospheric pressure.

Option 3: The process occurs under high pressure at a temperature above 430^oC.

Option 4: It is a thermochemical decomposition of organic waste.

Question : A wound stops bleeding due to the process of clot formation called:

Option 1: Coagulation

Option 2: Fermentation

Option 3: Transfusion

Option 4: Incubation

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