REVISION CLASS8
Crop Production and Management

1) In which season Rabi crop is grown.

a) Winter b) Rainy season

c) Summer d) Autumn Season.

2) When healthy seeds are dipped in water, seeds

a) Sink in water b) Float in water

c) Neither sink nor float d) All of these.

3) Which one is used to store grains on large scale.

a) Jute bags b) Silos

c) Metallic bins d) All of these.

4) Write cropping pattern for the following crops (Rabi / Kharif)

a) Paddy, Maize, soyabeen, goundnuts ______________

b) Wheet, gram, peas, mustard, Alsi ______________.

5) Sources of Irrigation. (Any four)

................. ...................... ..................... .........................

6) Write one word for following sentences.

a) Undesirable plants which are grown along with crop _____________.

b) To turn the soil and loosen it. _______________.

c) Bacteria present in roots of leguminous plants _______________.

d) Rearing of animals at large scale ___________________.

7) Differences between fertiliser and manure.

Fertilizer Manure

1 .................................. 1 ..................................

2 .................................. 2 ..................................

FORCE AND FRICTIONI. Fill in the blanks :

1. The force of friction always act in the _____________ direction to the applied force.

2. _____________ comes into play when we try to move an object at rest.

3. _____________ comes into play when an object is sliding over othe object.

4. Sliding friction is always _____________ than static friction.

5. Friction can be _____________ by using lubricants.

6. Friction is the force which _____________ the relative motion between two surfaces.

7. Friction can be increased by making a surface _____________.

8. The friction force exerted by fluid is also called _____________.

9. The common name of gases and liquids is _____________.

10. Name the device used for measuring the force acting on an object _____________.

II Answer the following

1. Name two methods of reducing friction.

2. Why the soles of shoes and tyres of cars, truck etc are grooved.

3. What is the cause of friction.

4. How the fluid friction can be minimized.

III Define friction.