CBSE > Class 08 > Science | CBSE Board | Homework Help

Take a battery. Connect to wires of the battery to a half slice of potato. Complete the circuit and leave it for some time. After sometime u will find the region of potato which is connected to the positive terminal of the battery turns green. This chemical effect of electric current.

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What is electroplating please describe

Posted by Dimpal Kumari 7 years ago

CBSE > Class 08 > Science

2 answers

Yogita Ingle 7 years ago

The process of depositing a thin layer of a desired metal over a metal object with the help of electric current is called electroplating.
Electroplating is done for
1) Protection from corrosion
2) Testing for decorative purpose
For example :Bathroom taps made of iron or steel are electroplated with chromium metal to prevent their corrosion or rusting. It gives a shining appearance to the bathroom taps due to which they look more attractive. The metal objects are usually electroplated with chromium, nickel, silver ,gold or copper metals.

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Dimpal Kumari 7 years ago

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How do vaccines eork

Posted by Sunny Rana 7 years ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 7 years ago

Vaccines contain dead or weakened microbes of a particular disease. When a vaccine is introduced into a healthy body, the body fights and kills them by producing suitable antibodies. These antibodies remain in the body and protect it when the microbe enters the body again.

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what is ill effect of electroplating

Posted by Balaji Jethliya 7 years ago

CBSE > Class 08 > Science

1 answers

Dimpal Kumari 7 years ago

The effect of electroplting is substance cannot rusted easily

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Why is chromium is used for electro plating

Posted by Muhammed Ammar 7 years ago

CBSE > Class 08 > Science

1 answers

Hardik Agarwal 7 years ago

Chromium,though expensive is used for electroplating becoz it is shiny and when electroplated looks good. It prevents the corroding of metals as it acts as a protective sheet which prevents the contact of metals from the air and moisture.

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Atmospheric electricity was discovered by

Posted by Aradhy Jha 7 years ago

CBSE > Class 08 > Science

4 answers

Ritik Dhakad 7 years ago

Banjamin franklin

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Shruti Shri 7 years ago

Atmoshpheric electricty means thunderstorm which was discovered by elstr & geitel

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Aradhy Jha 7 years ago

Give answer

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Aradhy Jha 7 years ago

What is answer

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What is a nitrogen cycle ?

Posted by Disha Zala 7 years ago

CBSE > Class 08 > Science

1 answers

Gaurav Seth 7 years ago

Nitrogen Cycle

Nitrogen cycle is all about the movement of nitrogen between various elements on Earth (like air, soil, living organisms etc.) The amount of nitrogen in the atmosphere remains constant.

Atmosphere has approx. 78% nitrogen.
Atmospheric Nitrogen is fixed into the soil
- N2 fixing microbes convert atm. N2 into nitrogen compounds like NH3
Plants utilize nitrogen from soil through their roots
Animals utilize nitrogen, feeding on plants
When Plants & animals die, Nitrogenous wastes are returned to soil
- Decomposers convert some part to nitrogen compounds to be used by plants
- Denitrifying bacteria convert into atm. N2

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What is fibre blends?

Posted by Manisha Parteki 7 years ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years ago

Blended fabrics are made by mixing two different kinds of fibres. These blended fabrics have combined properties of each component fibre.
Examples: Polycot is a mixture of polyester and cotton, Polywool is a mixture polyester and wool.
Blended fabrics have good appearance, comfort and available in low cost.

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Whay arelayers and broilers in a poultry farm

Posted by Aash Mohamad 7 years ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

Chickens raised for eggs are known as layers, while chickens raised for meat are called broilers. In the United States, the national organization overseeing poultry production is the Food and Drug Administration (FDA). A broiler is any chicken (Gallus gallus domesticus) that is bred and raised specifically for meat production. An egg laying poultry is called egger or layer whereas broilers are reared for obtaining meat. So a layer should be able to produce more number of large sized eggs, without growing too much. On the other hand, a broiler should yield more meat and hence should be able to grow well.

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What is the unit of amplitude

Posted by Nitish Shukla 7 years ago

CBSE > Class 08 > Science

4 answers

Nikita Maurya 7 years ago

The Sl unit of amplitude is meter (M)

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Hardik Agarwal 7 years ago

SI unit of amplitude is metre. (M)

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Nitish Shukla 7 years ago

Db(desible)

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Neha Gurjar 7 years ago

Metre

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What is inside the black hole ? What is scientist thinking about this?

Posted by Rushi Zingade 7 years ago

CBSE > Class 08 > Science

1 answers

Hardik Agarwal 7 years ago

U can consult to google rather

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Refraction of light

Posted by Sk Status 7 years ago

CBSE > Class 08 > Science

1 answers

Nitish Shukla 6 years, 11 months ago

When a light falls on irregular surface than a light reflect in to other or unparalleled line is called refraction of light

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Force of 20 N acts over an area of 4 cm². What is the Pressure?

Posted by Vasanthan Elumalai 7 years ago

CBSE > Class 08 > Science

2 answers

Gajavelli Swathi 7 years ago

5 pascal

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Rohini Gupta 7 years ago

Force=20N Area=4cmsquare=4 by100×100=1 by2500 Pressure=Force by area =20by 1 by 2500 = 50000Pa

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Two force of 8 Newton and 3 Newton act on a body in opposite direction . what is the direction and magnitude ( value )of the resultant force

Posted by Achal Rajput 7 years ago

CBSE > Class 08 > Science

1 answers

Arshad Iqbal 7 years ago

The direction of the body will be to that in which 8 Newton force is being applied because of the greater force. The resultant force will be the difference between the two forces i.e. 8-3=5 Newton.

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Difference between good conductor and bad conductor

Posted by Vanshika Panwar 7 years ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years ago

Good conductor	Poor conductor
Good conductor have large numbers of free electrons.	Poor conductor have very few number of free electron.
Good conductor have less resistance to the flow of electric current.	<div>Poor conductor have high resistance to the flow of electric current.</div>
Example - Copper and aluminium	Example -wood and plastic

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Why to do see moon

Posted by Tanisha Singh 7 years ago

CBSE > Class 08 > Science

1 answers

Hardik Agarwal 7 years ago

We see moon because it reflects the light of the sun. It does not produce its own light.

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A farmer never leaves his field follow will he get a good crop?

Posted by Pathak Akp 7 years ago

CBSE > Class 08 > Science

2 answers

Yashika Yadav 7 years ago

It may be correct or not

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Yashika Yadav 7 years ago

Defenately he will get a good crop The points could be:- 1) he can flew all the birds if he is always in the field so that the birds could not eat the seeds or could not harm the crops 2) he can take proper care of the crops 3) he could give timely watering to the crops 4) he could may not allow any animal to enter in his field I think it will help you

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What will happen if we cut trees and grass without limit..

Posted by Himanshu Nanda 7 years ago

CBSE > Class 08 > Science

1 answers

Vandana Sharma 7 years ago

Soon we will be not able to breathe becoz these plants r the only one which helps us to breath nd if we will cut them without limit a day will come we will be not able to live our life..???

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What is meant by earthing?

Posted by Disha Zala 7 years ago

CBSE > Class 08 > Science

3 answers

Kashish Bhambhani 7 years ago

Electric charges transfer to the earth either directly or indirectly is called earthing

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Vandana Sharma 7 years ago

IN SIMPLE WORDS connecting our house connections with ground...or surface of Earth is called EARTHING. it helps to release the extra electricity to earth........

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Yogita Ingle 7 years ago

Earthing is the process of connecting the exposed metal parts of an electrical circuit to the ground
Usually an electric appliance such as a heater, an iron box, etc. are fitted with all the three wires namely live, neutral and earth. The earth wire is connected to the metallic body of the appliance. This is done to avoid accidental shock. Suppose due to some defect, the insulation of the live wire inside an electric iron is burnt then the live wire may touch the metallic body of the iron.

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What is the chemical method of food preservation

Posted by Kaivalya Vats 7 years ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years ago

Chemical method of preservation is done by adding certain chemicals which have the capability of preserving the food. Some chemicals prevent the growth of microorganisms in food. These chemicals are used in pickles and jams to preserve them. Salt, acids and oil are also used as food preservatives. Examples: sodium benzoate and sodium metabisulphate.

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Force that results from action of muscle

Posted by Jayaraman Balakrishnan 7 years ago

CBSE > Class 08 > Science