Q.6 Answer in detail .
(1) Write a note on different types of irrigation methods.
(2) Explain two contact forces in detail.
(3) What are the harms which caused by burning of fossil fuels? write in detail.
(4) Write a short note : Irrigation methods in Agriculture.
(5) Write uses of metals and non-metals.
Answers
Explanation:
1) Surface irrigation. Water is distributed over and across land by gravity, no mechanical pump involved.
Localized irrigation. ...
Drip irrigation. ...
Sprinkler irrigation. ...
Center pivot irrigation. ...
Lateral move irrigation. ...
Sub-irrigation. ...
Manual irrigation.
2) Types of contact force:
Frictional Force: Friction is a force exerted by a surface against the motion of a body across its surface. ... Friction is a type of contact force only. Applied Force: Force which is applied to an object by another object. A person pushing a barrel is an example of applied force.
3) Burning fossil fuels emits a number of air pollutants that are harmful to both the environment and public health. Sulfur dioxide (SO2) emissions, primarily the result of burning coal, contribute to acid rain and the formation of harmful particulate matter
4)Surface irrigation. Water is distributed over and across land by gravity, no mechanical pump involved.
Localized irrigation. ...
Drip irrigation. ...
Sprinkler irrigation. ...
Center pivot irrigation. ...
Lateral move irrigation. ...
Sub-irrigation. ...
Manual irrigation.
5) Copper is used for making electrical wires, cooking utensils, etc. Zinc is mainly used as a protective coating for iron. Aluminium is used for making electrical cables, packaging, cooking utensils, etc. Non-metals Hydrogen is used for the synthesis of ammonia and methyl alcohol, in welding torches, etc.