Question

Say how sound is produced and about sound waves.
Types of mechanical waves

2.Learn properties of sound .
a) Loudness b) Pitch
c) Timbre

3.Audibility and Range of sound.
Write about the frequency of audible sound.
What is Infra and Ultra sonic sound?
4.How sound is produced by Humans?
Draw and Explain the mechanism of Ear.
What is known as noise pollution?
Discuss about the Health hazards due to noise pollution and ways to control it.
5.Say the classification of magnets.
Prepare a table on difference between Natural and Artificial magnets.

Write the properties of magnet.
A) Attractive b) Repulsive c) Directive.
7.Explain about magnetic material.
A) Dia magnet
b) Para magnet
c) Ferromagnet.
8.How artificial magnets are prepared?
List out the uses of magnets.
Draw Earth's magnetism and mark the poles.
9.Learn Electrolysis.
How water is prepared in Lab with diagram.
Write the physical and chemical properties of water.
10.Write the characteristics of potable water and the components dissolved in it.
Draw water treatment stages.
How water is purified at a water purification plant?
Explain different ways by which water gets polluted.
Write a Slogan on SAVE WATER.
11.Write the steps in basic practices of crop production.
What are the methods used to sow a seed?
12.Learn about the different types of irrigations.
List out the names of Agricultural Research Institutions.
13.Explain about Biocontrol methods.
List out EM Techonoly.
14.Write the Sorces ,Types and Prooerties of Hydrocarbons.
Write theuses and
advantages of natural gas.
15.Extraction and types and uses of coal.
Draw extraction of petroleum.​

Answer 1

Answer:

4.soud is produced by vibration