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What is sonorus

Posted by Lakshya Kumar 8 years ago

CBSE > Class 08 > Science

1 answers

Ishani Raizada 8 years ago

A property in which metals produces sound when hit by another objects.

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To check the flow of current through a liquid. led copper wire or iron spoon

Posted by Gargi Joshi 8 years ago

CBSE > Class 08 > Science

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A tub of water is placed under the sun. Some drops of oil is added to it. What change do you observe on the water surface?What phenomenon of light is responsible for it

Posted by Akash Mitra 8 years ago

CBSE > Class 08 > Science

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Which metal is both acid and base

Posted by Shivam Mishra 8 years ago

CBSE > Class 08 > Science

0 answers

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Short note on cloning of sheep

Posted by Lakshya Kumar 8 years ago

CBSE > Class 08 > Science

1 answers

Ishani Raizada 8 years ago

Cloning is the production of an exact copy of a cell,any other living part,or a complete organism.cloning of an animal was successfully performed for the first time by ian wilmut and his colleagues at the roslin institute in Edinburgh, Scotland.

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Define metal?

Posted by Lakshya Kumar 8 years ago

CBSE > Class 08 > Science

1 answers

Varun Raj 8 years ago

Those elements which have tendency to loose electrons are known a metals.They are electro positive in nature.eg.Mg2+ ion

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What is soda acid fire extinguisher. How does it work. Explane with example.

Posted by Ashu Raj 8 years ago

CBSE > Class 08 > Science

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How does fire extinguisher stop combustion ?

Posted by Ashu Raj 8 years ago

CBSE > Class 08 > Science

2 answers

Yukti Sharma 8 years ago

The fire extinguisher contains carbon doxide which stop s the supply of oxygen (oxygen is necessary for combustion)

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Dhuruv Giri 8 years ago

Because it contain carbon di oxide .

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Define electroplating with examples

Posted by Nivesh Yadav 8 years ago

CBSE > Class 08 > Science

1 answers

Amayra Yadav 8 years ago

Electroplating is a process that used in electric current to reduce dissolved metal cations so that they form a thin coherent metal coating on an electrode Eg copper , brass and other such things that we used in our daily life

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What is electrons and protons

Posted by Amayra Yadav 8 years ago

CBSE > Class 08 > Science

1 answers

Yash Singh 8 years ago

Electrons are the negative charged particles of an element and protons are the positive charge particles of an element.

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what is the Newton third law of gravity

Posted by Saumya Sshrivastav 8 years ago

CBSE > Class 08 > Science

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What ate the advantages of using CNG and LPG as fuels?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

1 answers

Akbar Ali 8 years ago

The advantage of uaing of CNG and LPG as fuel are as. 1it is use as fuel in some car 2.it is use in power generation

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A coil of insulated copper wire is connected to a torch bulb.What would happen if bar magnet is (a)pushed into the coil? (b)pulled out of the coil? (c) Kept stationary within the coil?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

0 answers

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Define solar system. Name the planets in the solar system.

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

1 answers

Amayra Yadav 8 years ago

The solar system formed 4.5 billion years ago from the gravitational collapse of a giant interstellar molecular clouds. The vast majority of the system mass is in the sun with the majority of remaining mass contained in Jupiter . The solar system include the stars , planets , and there have no gravity that is why we cannot' stand on outer space. There are eight planets in our solar system are mercury , venus , earth , mars , jupiter , saturn , neptune , uranus.

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What is potable water ?Give two parameters that must be followed before water is used for drinking. OR What is meant by water harvesting?How is it done?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

1 answers

Rakhi Khatri 8 years ago

The water that is fit for drinking is called potable water Parameters tha must be followed are- 1.It must be free from microorganism which lead to many diseases. 2.It must be free from harmful chemicals HOPE THIS HELP U ?

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Gold is a very precious metal.pure gold is not suitable for making Jewellery as it is very soft .It is alloyed with either copper or silver to make it hard.But sometimes jewellers mix a large quantity of copper and silver in gold to earn more profit? (a)Gold and silver come under which category of metals? (b)List the precautions that we should take while purchasing gold jewellery .What values do we posses by taking those precautions?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

0 answers

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Define ductility

Posted by Lakshya Kumar 8 years ago

CBSE > Class 08 > Science

2 answers

Rakhi Khatri 8 years ago

Metals can be drawn into thin wires. This property of metal is known as ductility

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Nitish Gaur 8 years ago

Tar bnane ki shmta

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What are rods and cones?what are their function?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

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What are the properties of polythene?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

0 answers

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Define amplitude. what is the effect on the loudness of a sound when the amplitude of the vibrating body gets doubled?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

0 answers

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Why is it easier to hammer a sharp nail into wood than a blunt one?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

1 answers

Shyamoli Gogoi 8 years ago

It is easier to push a nail through its pointed end than through its blunt end , because small area of the pointed end helps in creating more pressure and its become easier to insert the nail

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State the types of combustion.

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

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Define smog.What are the pollutants generally present in a smog.

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

0 answers

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Define the terms:(a)focus(b)epicentre of an earthquake.

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

1 answers

Dinky Khurana 8 years ago

The place from where earthquake originates is called focus and The place vertically above the focus is called epicentre

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(a)Which lens is present in human eye? (b)Name the disease caused by definitency of vitamin A.

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

1 answers

Shyamoli Gogoi 8 years ago

Convex lens, night blindness

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We should not wear synthetic clothes in summer. why?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

1 answers

Yuvraj M 8 years ago

Because in synthetic cloths there is no holes so the heat comes out from our body cannot comes out from the cloth

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How can we control water pollution?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science

1 answers

Amayra Yadav 8 years ago

If we not pollute the rivers and other water resources and we didn't waste water through nulls and the messy water we didn't throw we throw the water in tress and the rainy water on roofs we can collect it for tress so that the water doesn't wasted .

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What properties of plastics make it useful for many things?

Posted by Shivansh Handa 8 years ago

CBSE > Class 08 > Science