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

A heavy truck is fitted wih six or fourteen tyres. These tyres increase the area of contact on which their weight acts and hence reduce their pressure on the ground.

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5r principle

Posted by Priyanshi Sharma 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Nisha Bhujade 7 years, 4 months ago

Reduce ,reuse ,recover,repurpose ,refuse

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Bhupesh Shrotriya 7 years, 4 months ago

Reduse reuse recycle recover and refuse

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What are the migratory birds

Posted by Punit Amit 7 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Soumya Pandey 7 years, 4 months ago

Birds that move from place to another in the search of food,water,shelter & favourable climate

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Gundu Mama 7 years, 4 months ago

Birds that move towards warmer areas during winter are known as migratory birds.

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Pankaj Singh 7 years, 4 months ago

One place to another place are move to tolerate habitat

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How did coke formed

Posted by Mahak Mahajan 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Ayushman Thakur 7 years, 4 months ago

Destructive distillation of coal produces coke..

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Tarmeem Khanam 7 years, 4 months ago

It is a tough porous and black substance it is an almost pure form of carbon

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Caol is formed by which process

Posted by Lucky Tomar 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Lucky Raj 7 years, 4 months ago

Carbonisation

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If u are intelligent answer my question without help of google

Posted by Manas Pratap 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Tanu Dubey 7 years, 4 months ago

Some metals are so unreactive that they do not react with dilute acid. Some examples like gold , silver , copper etc.

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Why copper dont react with dilute hydrochloric acid even on heating and if annswer is less reactive so why it doesn't react with heated dilute hydrchloric acid even after heating because after heating it becomes concentrated

Posted by Manas Pratap 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Soumya Pandey 7 years, 4 months ago

Because hydrocloric acid contains hydrogen & copper is less reactive than hydrogen

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A diesease caused in plants by fungi?????

Posted by Soumya Pandey 7 years, 4 months ago

CBSE > Class 08 > Science

7 answers

Charul Malik 7 years, 4 months ago

Smut of rice

2Thank You

Soumya Pandey 7 years, 4 months ago

Of 8A st michael's

1Thank You

Soumya Pandey 7 years, 4 months ago

Manas , do you know katare

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Soumya Pandey 7 years, 4 months ago

Are you manas of 8 A

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Soumya Pandey 7 years, 4 months ago

Yes I am

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Manas Pratap 7 years, 4 months ago

Soumya are u of st michaels

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Manas Pratap 7 years, 4 months ago

Rust of wheat

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Define astronomy

Posted by Piyush Rathod 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Sabapathy V 7 years, 4 months ago

the branch of science which deals with celestial objects, space, and the physical universe as a whole

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Woh Was the First person to establish the existence of bacteria

Posted by Mohit Kumar 7 years, 4 months ago

CBSE > Class 08 > Science

4 answers

Roshan Raj 7 years, 4 months ago

Anton van leeuwenhoek in 1677

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Nisha Bhujade 7 years, 4 months ago

Antony van leeuwenhoek

1Thank You

Manas Pratap 7 years, 4 months ago

Wron mohit maybe u have typed wrong it is antony van leeuwenhoek

1Thank You

Mohit Kumar 7 years, 4 months ago

Anton won leewenhoek

1Thank You

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Difference between silos and granaries

Posted by Akanksha Sandhu 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Krutika Raipurkar 7 years, 4 months ago

Both are same , it is the place where the grains are protect from pests like rats & insects .

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Tincture is used as an

Posted by Shamanvitha Dange 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 7 months ago

Tinctures are preparations that use something other than water as a solvent. Using a solvent like alcohol, vinegar, or glycerin, you can extract a more considerable amount of the medicinal constituents of the plant and preserve those constituents much longer than you can with loose herbs, or powder. Most tinctures use ethyl alcohol, which is a high-proof alcohol that is commercially available and very safe for consumption. Given that the amount of tincture taken is very small (usually between 20-40 drops) the amount of alcohol consumed is negligible.

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What is a Petroleum

Posted by Tarmeem Khanam 7 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Nisha Bhujade 7 years, 4 months ago

Petroleum is a dark coloured and thick oily liquid.

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Mohit Kumar 7 years, 4 months ago

Its simple definition is that it is a fossil fuel. It is dark coloured, viscous and foul smelling liquid.the word petra means rock and oleum means oil

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Sakshi Matra 7 years, 4 months ago

Heavy moyor vehicles like trucks and tractors run on diesel.Petrol and diesel are obtainted from a natural resource called petroleum.

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What are non metal give ex

Posted by Mayank Rana 7 years, 4 months ago

CBSE > Class 08 > Science

4 answers

Nisha Bhujade 7 years, 4 months ago

Iron ,copper,tin,gold etc ...are metal

1Thank You

Mohit Kumar 7 years, 4 months ago

Corbon dioxide. ,bicarbonates etc

1Thank You

Prabhu Oraon 7 years, 4 months ago

Plastic

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Akansha Varyani 7 years, 4 months ago

The substances which are non-sonorous and poor conductors of electricity and heat. These materials are called non-metals. Example- sulphur, carbon, oxygen, phosphorus.

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Who discover the electromagnetic force.

Posted by Shubham Shirtode 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Nisha Bhujade 7 years, 4 months ago

Hans christian orsted

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Sakshi Matra 7 years, 4 months ago

Hens cheristian orsted in 1820

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Compare LPG and wood as fuel

Posted by Harsh Mittal 5 years, 9 months ago

CBSE > Class 08 > Science

2 answers

Atharv Gitte 7 years, 4 months ago

LPG undergoes rapid combustion whereas wood undergoes slow combustion.

4Thank You

Pankaj Singh 7 years, 4 months ago

Lpg is a non luminious( blue )color and wood is a luminious (yellow ) carbon particles

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Different between fertilizers and manure

Posted by Arya Raj 7 years, 4 months ago

CBSE > Class 08 > Science

5 answers

Nisha Bhujade 7 years, 4 months ago

Fertilizers are produce in factory Manure are preaperd in field by the decomposition of animal waste , plant waste and human waste

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Nisha Bhujade 7 years, 4 months ago

Fertilizer are inorganic salt Manure are natural organic salt

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Dilip Paswan 7 years, 4 months ago

Fertilizer is an inorganic substance Manure are organic substance

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Shweta Kumari 7 years, 4 months ago

fertilizers is done in factory but manure is prepare in large field

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Arya Raj 7 years, 4 months ago

Fertilizers does not provide any humas and manure provide lot of humas

1Thank You

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How hydras reproduce?

Posted by Priyattam Rana 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

Budding in Hydra: A bud grows anywhere on the main body of hydra. The bud grows to a certain size and gets detached from the mother hydra. This develops further to grow into a new individual.

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Give any 5 example in disadvantages and advantages of friction

Posted by G.Suvathi G.Suvathi 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

ADVANTAGES OF FRICTION
Friction plays a vital role in our daily life. Without friction we are handicap.
1. It is becomes difficult to walk on a slippery road due to low friction. When we move on ice, it becomes difficult to walk due to low friction of ice.
2. We can not fix nail in the wood or wall if there is no friction. It is friction which holds the nail.
3. A horse can not pull a cart unless friction furnishes him a secure Foothold.
DISADVANTAGES OF FRICTION
Despite the fact that the friction is very important in our daily life, it also has some disadvantages like:
1. The main disadvantage of friction is that it produces heat in various parts of machines. In this way some useful energy is wasted as heat energy.
2. Due to friction we have to exert more power in machines.
3. It opposes the motion.
4. Due to friction, noise is also produced in machines.
5. Due to friction, engines of automobiles consume more fuel which is a money loss.

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When someone gets a current,is it due to the uncharged body or charged body? Explain in detail.

Posted by Kushal Dayma 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

G.Suvathi G.Suvathi 7 years, 4 months ago

By electrostatic force

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A write up on life and works of great lndian Mathematician aryabhatta

Posted by Devika Km 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Mohit Kumar 7 years, 4 months ago

Aryabhat was a great mathematician and astronomer. He has given tje concept of zero(0)

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Write up

Posted by Devika Km 7 years, 4 months ago

CBSE > Class 08 > Science

0 answers

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Name the largest cell

Posted by Pankaj Garg 7 years, 4 months ago

CBSE > Class 08 > Science

3 answers

Nisha Bhujade 7 years, 4 months ago

The largest cell found in nature are ostrich eggs

1Thank You

Soumya Pandey 7 years, 4 months ago

Ostrich's egg

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Pankaj Garg 7 years, 4 months ago

Spherical RBCof humans , spindle shape a muscle cell,long branched nerve cell

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What is pressure how does air exert pressure with an example of an image??????!!!!!

Posted by Aashu Kumar 7 years, 4 months ago

CBSE > Class 08 > Science

2 answers

Aashu Kumar 7 years, 4 months ago

You sutup you stupid

1Thank You

Aashu Kumar 7 years, 4 months ago

No it is force, pressure is a force actin on a unit area of a surface is called pressure

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Is there any difference between synthetic fibres and synthetic polymers. If yes why and if no why ❓❓

Posted by Sneha Bansal 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

Synthetic Fibre: Fibres which are man-made are called synthetic fibres, e.g. nylon, acrylic, etc. A synthetic fibre is made of multiple units of a chemical substance. The units in a fibre are joined together like a chain.
Polymer: A chain of a particular chemical substance is called a polymer. The individual unit in a polymer is called the monomer. Thus, a polymer is made up of many monomers. All synthetic fibres are polymers. Even cotton is a polymer.

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What is gas

Posted by Mohammad Raheeb 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Aashu Kumar 7 years, 4 months ago

Gas is one of the four fundamental states of matter. A pure gas may be made up of individual atoms, elemental molecules made from one type of atom, or compound molecules made from a variety of atoms.

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Water contains hydrogen and oxygen then why it does not catch fire

Posted by Ashok Mishra 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Anmol Kesarwani 7 years, 4 months ago

Because in the water the presence of Hydrogen is 2 times more than the presence of Oxygen,that is why it does not catch fire.

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Rusting of iron is combustion or not?

Posted by Harshita Sikarwar 7 years, 4 months ago

CBSE > Class 08 > Science

1 answers

Aashu Kumar 7 years, 4 months ago

No, because rusting is only oxidation, it is not combustion at all. Combustion is rapid oxidation by oxygen with the liberation of heat. Rusting is a process of slow oxidation of iron by atmospheric oxygen in the presence of moisture.

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What is ovualation

Posted by Ansh Pandey 7 years, 4 months ago

CBSE > Class 08 > Science