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

Ganga is a river on which millions of lives depend for their daily needs and livelihood.World Wide Fund for Nature ( WWF) has foundGanga has become one of the 10 most endangered rivers in the world .this has happened because because towns and cities through which this river flows through large amount of untreated sewage and garbage into the river.

5Thank You

ANSWER

What us golbal warming

Posted by Prince Rajput 6 years, 9 months ago

CBSE > Class 08 > Science

5 answers

K Raja 6 years, 9 months ago

Cutting down of trees making deforestation. Decreasing trees is making the global warming

0Thank You

Vidya Ny 6 years, 9 months ago

In simple words, global warming is the gradual rise of temperature of the Earth surface due to certain gases like carbon dioxide methane water vapour etc.

0Thank You

Raisha Prakash 6 years, 9 months ago

Rise in earths temperature which lead to warmth of earth

0Thank You

Om Kumar 6 years, 9 months ago

The access of green house gases like carbon dioxide, methane lead to global warming.

1Thank You

Prince Rajput 6 years, 9 months ago

Whai is

1Thank You

ANSWER

What is formula of potassium acid

Posted by Anam Fatima 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Pooja K 6 years, 9 months ago

Is'K'

0Thank You

Rock Clien 6 years, 9 months ago

0Thank You

ANSWER

AIDS is caused by which organism

Posted by Manan Lalwani 6 years, 9 months ago

CBSE > Class 08 > Science

4 answers

Pooja K 6 years, 9 months ago

Virus

0Thank You

Singh Apple Notebook Pvt. Ltd. 6 years, 9 months ago

HIVirus

0Thank You

Naman Jük@Rîy@ 6 years, 9 months ago

AODS is caused by HIV virus

0Thank You

Lalit Sahni 6 years, 9 months ago

AIDS is caused by virus.

0Thank You

ANSWER

What is cabonisation

Posted by Rohit Arvind 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Rashi Aggarwal 6 years, 9 months ago

The process of conversion of wood into coal is called carbonization

0Thank You

Neharika Varshney 6 years, 9 months ago

When dead remains of plant are slowly converted into coal this process is called carbonistion.

0Thank You

ANSWER

what is the reaction which takes place during electroplating of copper?(write the chemical equations separately in anode and cathode )

Posted by Ayanjyoti Roy 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

The process of depositing a thin layer of desired metal over a metal object with the help of electric current is called electroplating. The purpose of electroplating is to protect the metal objects from corrosion or to make the metal objects look more attractive. The metal objects are usually electroplated with chromium, tin, nickel, silver, gold or copper objects.

Take 250 ml of distilled water in a clean beaker and dissolve two teaspoon full of copper sulphate in it. This will give us a blue coloured copper solution. Add a few drops of dilute sulphuric acid to copper sulphate solution to make it more conducting. Take a copper plate and a door key made of iron. Clean copper plates and the iron key by rubbing it with sand paper. Now rinse them with water and dry them. Immerse the cleaned copper plate in copper sulphate solution in the beaker. Connect the copper plate to the positive terminal of a battery through a switch. This copper plate becomes the positive terminal. Immerse the cleaned iron key in copper sulphate solution and connect it to the negative terminal of the battery so that it becomes the negative electrode. Allow the current to pass for about 15 minutes. Now remove the electrodes from the solution and observe. We will find that the copper plate has dissolved a little and the iron key has got a reddish layer of copper metal all over its surface. Thus, the iron key has become electroplated with copper. The solution remains unchanged.

0Thank You

ANSWER

Why opposite charges attract each other and similar repels?

Posted by Granth Jain 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Lalit Sahni 6 years, 9 months ago

Oppositively charged objects will text and attractive impressed upon each other. In contrast to the attractive force between two objects with opposite charges, two objects that are if like charge will repel each other .this repulsive force will push the two objects apart.

2Thank You

ANSWER

What are the characteristic of an ideal fuel

Posted by Deepa Dasan 6 years, 9 months ago

CBSE > Class 08 > Science

3 answers

Amit Kathuria 6 years, 9 months ago

1 cheap 2 high calorific value 3 non pollutant 4 no residue after burning 5 low ignition temperature 6 easy to carry ,hande, store

0Thank You

Om Kumar 6 years, 9 months ago

It is cheaper. It has more calorific value than other fuels. It is easy to carry. It doesn't pollute environment

2Thank You

Rohan Sharma 6 years, 9 months ago

it is readily available

2Thank You

ANSWER

What sound

Posted by Punya Patel 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Rohan Sharma 6 years, 9 months ago

the energy which causes the sensation of hearing

0Thank You

ANSWER

What is another name of plastids

Posted by .. ... 6 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Nagaraju Iragaraju 6 years, 9 months ago

Chloro plasts

0Thank You

Om Kumar 6 years, 9 months ago

Pigment

1Thank You

ANSWER

What is potable

Posted by Krishna Singh 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Arpan Tiru 6 years, 9 months ago

water which is suitable for drinking is called potable water

1Thank You

ANSWER

What is charge object?

Posted by Madeeha Sayyed 6 years, 9 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 6 years, 9 months ago

A body is said to be charged if it has unequal number of electrons and protons. Any object that contains less electrons than protons is said to be positively charged. Conversely, any body that contains more electrons than protons is said to be negatively charged.

2Thank You

ANSWER

What is present in nucleus except nuclelolos and chromosomes?

Posted by Om Kumar 6 years, 9 months ago

CBSE > Class 08 > Science