set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

The percentage of nitrogen in urea is

a) 47%

b) 30%

c) 25%

d) 60%

Question : 2

Which one of the following compounds is used as a sedative?

a) Calcium Chloride

b) Ethyl Alcohol

c) Potassium Bromide

d) Phosphorus Trichloride

Question : 3

‘Humus’ is an example of

a) Organic colloids

b) Soil structure

c) Crystalloids

d) None of the above

Question : 4

Tetraethyl Lead (TEL) is added to petrol

a) To increase its anti-knocking rating

b) To prevent it from freezing

c) To increase its flash points

d) To increase its boiling point

Question : 5

Consider the following statements. Sodium silicate and sodium sulphate are mixed as detergents in washing powders so that

1. To maintain dryness of the powder.
2. To maintain the basicity of powder.

a) Only 2

b) Both 1 and 2

c) Only 1

d) None of these

Question : 6

The Pressure gauge is not given in the domestic LPG cylinders because

a) Their use is not safe

b) They are so costly

c) They cannot represent the quantity of gas in LPG cylinders

d) They are choked by LPGs