set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

The boiling point of alcohol is 78°C. What is this temperature in Kelvin scale

a) 375 K

b) 373 K

c) 351 K

d) 78 K

Question : 3

Match the following columns ?

a) A - 3, B - 4, C - 2, D - 1

b) A - 2, B - 1, C - 3, D - 4

c) A - 2, B - 4, C - 3, D - 1

d) A - 3, B - 1, C - 2, D – 4

Question : 4

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 : 5

A change is said to be a chemical change when

a) it is accompanied by change in physical properties

b) it is accompanied by formation of new substances

c) it is accompanied by energy change

d) All the above are correct

Question : 6

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

a) scattered

b) refracted

c) reflected

d) absorbed