SCIENCE CLASS 8TH

What is Anthracite?

• Coke

• Coal

• Bitumen

• Fossil

Napthalene balls are obtained from fractional distillation of (a)   .

__________is almost pure form of carbon.

• coal

• petroleum

• coal tar

• coke

___________is used in skin ointments.

• paraffin wax

• lubricating oil

• kerosene

• diesel

Seed drill is usedfor (a)   with the help of tractor.

THIS INSTRUMENT IS USED FOR

• HARVESTING

• CUTTING

• IRRIGATION

• TILLING

Silos are used for

• storing the grains

• storing the tools

• ploughing

• agriculture

Which of the following is not true for fertilisers?

(a) They increase the yield

(b) Their excessive use disturbs the balance of nutrients in soil

(c) They are generally used in small quantity

(d) They are environment friendly

• a

• b

• c

• d

The practice of growing two or more dissimilar crops in the same field one after another is

(a) crop rotation

(b) tilling

(c) plantation

(d) weeding

• a

• b

• c

• d

Substances which are added to the soil in the form of nutrients for the growth of the plants are called (a)   .