set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following is the best example of the law of conservation of mass?

a) A sample of air increases in volume when heated at constant pressure but mass remains unchanged

b) When 12 gm of carbon is heated in vacuum, there is no change in mass

c) Weight of platinum wire is the same before and after heating

d) 12 gm of carbon combines with 32 gm of oxygen to give 44 gm of carbondioxide.

Question : 2

The chemical name of 'Marsh gas' is

a) Propane

b) Ethene

c) Methane

d) Hexane

Question : 3

Select the one that is a physical change.

a) Rusting of iron

b) Growth of plant

c) Digestion of food

d) None of these

Question : 4

On passing through a colloidal solution, the beam of light gets ..........

a) scattered

b) refracted

c) reflected

d) absorbed

Question : 5

Which of the following statements is true about a colloidal system?

a) It can be made out of two gases

b) It consists of one phase only

c) It carries a net electric charge

d) It is electrically neutral as a whole

Question : 6

Tails of comets are visible due to

a) Brownian movement

b) Tyndall Effect

c) Reflection

d) None of these