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

Advantages of fuel CNG and LPG are- 1st. They can be used directly for burning in factories and homes, vehicles etc. 2nd. Both are gases and can be supplied in pipe lines. 3th. Both are eco friendly and less polluting. 4th. Many Chemicals and fertilizers are made up by natural gases they are available on very low prices.

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Sanjana Singh 6 years, 3 months ago

The advantage of using CNG and LPG as fuel are 1 they do not produce any residue so that are cleaner fuel 2 they do not produce smoke so they are eco friendly

1Thank You

Satvika Senthilnathan 6 years, 3 months ago

LPG is very useful in our day to day life for example we use LPG in our kitchen that is gas cylinders

3Thank You

ANSWER

Which gad is liberated when metal reacts with water

Posted by Babita Tyagi 6 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Kunal Singh 6 years, 3 months ago

Metal higher than hydrogen in the activity series displace hydrogen from water.

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Ayushi Kapoor 6 years, 3 months ago

When a metal reacts with water it releases hydrogen gas

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ANSWER

3 condition where friction be minimized and increased

Posted by Megha Pandit 6 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Krishna Chauhan 6 years, 3 months ago

1.lubrication(oiling and greasing) 2.using ball bearings in machines to prevent wear and tear 3.using treads in shoes

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ANSWER

Define nitrogen cycle and nitrogen fixation.(keyword)

Posted by Sanjana Singh 6 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Sia ? 6 years, 3 months ago

Nitrogen cycle. : a continuous series of natural processes by which nitrogen passes successively from air to soil to organisms and back to air or soil involving principally nitrogen fixation, nitrification, decay, and denitrification.
Nitrogen fixation : Conversion of inert elemental nitrogen gas into biologically usable form is called nitrogen fixation.

3Thank You

Arjun Soni 6 years, 3 months ago

A process of conversion of nitrogen to nitrate and nitrate to nitrogen is known as nitrogen cycle

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ANSWER

Different between wildlife sanctury and national park

Posted by Subha Lakshmi 6 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

A Wildlife Sanctuary is a protected area of land which is created for the protection of wild animals in their natural environment like forests. It is a place where wild animals remain safe. In wildlife sanctuaries, poaching (killing) or capturing of wild animals is strictly prohibited. However, a national park is a relatively large area of scenic beauty protected and maintained by the government to preserve flora and fauna, landscape, historic objects of the area and the places of scientific interest. A National Park also serves the purpose the human recreation and enjoyment. The human activities such as mining, hunting and fishing, etc. are not allowed inside a National Park.

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ANSWER

What are pathogens

Posted by Anushka Shrivastava 6 years, 3 months ago

CBSE > Class 08 > Science

7 answers

Angel Arora 6 years, 3 months ago

Microorganisms which causes diseases in humans and plants.Such microorganisms called pathogens

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Parul Jain 6 years, 3 months ago

Disease causing microorganisms

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Ayushi Kapoor 6 years, 3 months ago

The disease causing microorganisms are called pathogens.

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Babita Tyagi 6 years, 3 months ago

Disease causing microorganisms

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Ezra Naomi Roy 6 years, 3 months ago

Disease causing microorganisms are known as PATHOGENS

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Dhritishman Nath 6 years, 3 months ago

Pathogens cause diseases such as malaria, dysentery ..

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Yogita Ingle 6 years, 3 months ago

Microorganisms are harmful as they cause many diseases. There are many microbes which cause several diseases in plants, animals & human beings. Such disease-causing organisms are called Pathogens. We can also say that pathogens are diseases causing microorganisms. Pathogens include bacteria, viruses, fungi & protozoa.

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ANSWER

Why are mitochondria called the powerhouse of the cell

Posted by Aarav Chauhan 6 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Krishna Chauhan 6 years, 3 months ago

Because it breaks down complex food particles along with oxygen to form energy

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Dhritishman Nath 6 years, 3 months ago

Because it provides Energy to the whole cell.

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ANSWER

Name the toxin produced by aspergillus

Posted by Vijay Agrawal 6 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

Aflatoxins are poisonous substances produced by Aspergillus.

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ANSWER

What is my name

Posted by Syeda Kulsum 6 years, 3 months ago

CBSE > Class 08 > Science

3 answers

The King Elandhanan 6 years, 3 months ago

Do properly

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Gurmeet Kaur 6 years, 3 months ago

Give a proper questions

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Aarav Chauhan 6 years, 3 months ago

Its you gotted what your name

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ANSWER

What is ekaryotes cell

Posted by Pranav Garg 6 years, 3 months ago

CBSE > Class 08 > Science

4 answers

Krishna Chauhan 6 years, 3 months ago

The group of unicellular and multicellular organism with a well defined neucleus in their cells are known as eukaryotes,which have eukaryotic cells

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Kavita Pawria 6 years, 3 months ago

It is not well defined nucleus

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Prathamesh Chakrawar 6 years, 3 months ago

eukaryoric cell is a cell where nucleus and other well defined organs are preseent

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Prerana Sharma 6 years, 3 months ago

Cells which have a well defined neucleus with a neuclear membrane are called eukaryotic cells.

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ANSWER

What is cell ...?

Posted by Durgesh Mishra 6 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Parul Jain 6 years, 3 months ago

The cell is the basic and functional unit of life

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Prathamesh Chakrawar 6 years, 3 months ago

fundamental structure and basic unit of body is called cell

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Krishna Chauhan 6 years, 3 months ago

The basic structural and functional unit of life is know as a cell

1Thank You

Dhritishman Nath 6 years, 3 months ago

The Basic structural unit of an organ which performs several Functions are called Cells.

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Maneeshwar Singh 6 years, 3 months ago

The cell is the basic structural functional and biological unit of all known organisms. A cell is the smallest unit of life. Cell consist of cytoplasm enclosed with amembrane, which contains many biomolecules such as proteins and nucleic acids.

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ANSWER

What is gravitional force

Posted by Shashwat Singh Yadav 6 years, 3 months ago

CBSE > Class 08 > Science

7 answers

Angel Arora 6 years, 3 months ago

Objects,things fall towards earth due to gravitational force

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Babita Tyagi 6 years, 3 months ago

Force with which earh pulls objects towards itself

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Vatsal Gupta 6 years, 3 months ago

It is a type of force. It is the force of earth that attract us towards it

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Krishna Chauhan 6 years, 3 months ago

The force exerted by an object possessing mass is known as gravitational force.the gravitational force of earth is know as gravity

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Khushi Tambi 6 years, 3 months ago

The force exerted by gravity is known as gravitional force

2Thank You

Maneeshwar Singh 6 years, 3 months ago

Earth attracts every object towards itself with a force. This force is called gravitional force.

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Durgesh Mishra 6 years, 3 months ago

Gravitional force is a magnetic force it attract the things

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ANSWER

What is electrstatic force?

Posted by Shashwat Singh Yadav 6 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Angel Arora 6 years, 3 months ago

The force exerted by charge body on uncharged body or another charged body called electrostatic force

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Maneeshwar Singh 6 years, 3 months ago

The force exerted by a charged body on another charged or uncharged body is known as electrostatic force.

2Thank You

ANSWER

What is full form is N.P.k.

Posted by Vanah Singh 6 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Angel Arora 6 years, 3 months ago

NPK=nitogen phosphorus potassium

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Vatsal Gupta 6 years, 3 months ago

Nitrogen , phosphorus , and pottasium.

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Charu Verma 6 years, 3 months ago

Nitrogen, phosphorus, potassium

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Aarav Chauhan 6 years, 3 months ago

Nitrogen, phosphorus and potassium

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Maneeshwar Singh 6 years, 3 months ago

Nitrogen,Phosphorus and Potassium.

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ANSWER

What is mitrocondria

Posted by Ansh Chaudhary 6 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Jahanvi Sharma 6 years, 3 months ago

A cell organelle

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Pranav Garg 6 years, 3 months ago

It is known as powerhouse of the cell as it provide power to the cell

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Sriya? Ghosh 6 years, 3 months ago

Mitochondria is a cell organelle. It is embedded in the cytoplasm.

1Thank You

ANSWER

The process of loosening and turning of soil is called

Posted by Ashu Gupta 6 years, 3 months ago

CBSE > Class 08 > Science

11 answers

Angel Arora 6 years, 3 months ago

Rolling or ploughing

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Ayushi Kapoor 6 years, 3 months ago

Ploughing or tilling

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Krishna Chauhan 6 years, 3 months ago

Ploughing or tilling

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Charu Verma 6 years, 3 months ago

Tilling

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Krish Debbarma 6 years, 3 months ago

Irrigation

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Jahanvi Sharma 6 years, 3 months ago

Tiling and ploughing

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Pranav Garg 6 years, 3 months ago

Tilling and ploughing

0Thank You

Sriya? Ghosh 6 years, 3 months ago

Tilling and ploughing

1Thank You

Ansh Chaudhary 6 years, 3 months ago

Tilling

1Thank You

Anagha Avinash 6 years, 3 months ago

Tilling

0Thank You

Divyansh Sharma. 6 years, 3 months ago

Tilling

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ANSWER

What is frictional gorce?

Posted by Satvik Singh Yadav 6 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Babita Tyagi 6 years, 3 months ago

Force acting between 2 surfaces in contact and to oppose the motion

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Krishna Chauhan 6 years, 3 months ago

The force which always opposes the motion of one object over another object is known as frictional force. Frictional force is due to the interlocking of irregularities of the two obect's surface

1Thank You

Lavisha Gupta 6 years, 3 months ago

Frictional force is a force acting in opposite directions to the motion of a body

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Yogita Ingle 6 years, 3 months ago

Frictional force refers to the force generated by two surfaces that contacts and slide against each other. These forces are mainly affected by the surface texture and amount of force impelling them together. The angle and position of the object affect the amount of frictional force.

1Thank You

Hermoine Granger 6 years, 3 months ago

FRICTIONAL FORCE : It is a contact force which opposes the motion between two surface....... I know about frictional force but not aboutb" frictional gorce "

1Thank You

ANSWER

Why did the curd becomes sour quickly in summer?

Posted by Priyal Jain 6 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Jahanvi Sharma 6 years, 3 months ago

Because amount of lactic acid increases in curd in summer

1Thank You

Yogita Ingle 6 years, 3 months ago

Curd is formed when Lactobacillus bacteria rreproduce. If the curd is not transferred to a cool place, then curd turns sour because the bacteria continue to multiply and produce more lactic acid inside the milk. This lactic acid makes curd sour in taste.

1Thank You

Ripanjot Kaur 6 years, 3 months ago

Because in summer very hotness is there the hotness reacts with the bacterias so that why the curd become so sour in summer season

1Thank You

ANSWER

What are synthetic fibres why they known the that name

Posted by Ripanjot Kaur 6 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Hermoine Granger 6 years, 3 months ago

Synthetic fibres are fibres obtained by chemical processing and made of petrochemicals.... They are known by that name because they are natural not man - made

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Ripanjot Kaur 6 years, 3 months ago

Also asked that why they not the that name synthetic fibre why

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Shobhit Rawat 6 years, 3 months ago

Synthetic fibres are those fibres which are obtained by the chemical treatments.

2Thank You

ANSWER

Give some examples of weedicides ?

Posted by Ezra Naomi Roy 6 years, 3 months ago

CBSE > Class 08 > Science

10 answers

Angel Arora 6 years, 3 months ago

2,4-D

2Thank You

Babita Tyagi 6 years, 3 months ago

Dalapon

1Thank You

Charu Verma 6 years, 3 months ago

Metaclor and 2-4d

1Thank You

Gurmeet Kaur 6 years, 3 months ago

Khurpi and 24_d

1Thank You

Ansh Chaudhary 6 years, 3 months ago

2-4d

1Thank You

Lavisha Gupta 6 years, 3 months ago

2 4-D

1Thank You

Hermoine Granger 6 years, 3 months ago

Aldrin and DDT

1Thank You

Ripanjot Kaur 6 years, 3 months ago

The weeds can be removed by the operating core cutting them close to the ground with the help of khurpi

1Thank You

Shubham Kumar 6 years, 3 months ago

2-4d

1Thank You

Maneeshwar Singh 6 years, 3 months ago

They include DDT(Dichloro Diphenly Tricloroethane),DDE,Chlordane ,Aldrin,Dieldrin,Endrin,Heptachlor,BHC (Benzene Herca Chloride)

3Thank You

ANSWER

What are the basic practice of crop production

Posted by Anshu Kumar 6 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Angel Arora 6 years, 3 months ago

1)Preparation of soil 2)Sowing 3)Adding manure and fertiliser 4)Irrigation 5)Protection from weeds 6)Harvesting 7)Storage

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Ezra Naomi Roy 6 years, 3 months ago

1. Preparation of soil 2. Sowing 3. Adding manure and fertilisers 4. Irrigation 5. Protecting from weeds 6. Harvesting 7. Storage

2Thank You

ANSWER

Write the feauters of spandex.

Posted by 9611712611 Shankrappa 6 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Aastha Verma 6 years, 3 months ago

A type of stretchy polyurethane

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9611712611 Shankrappa 6 years, 3 months ago

Commonly called as lycra Inveted by joseph shivers in the year 1998

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ANSWER

Can you please tell me the valency table?

Posted by Ezra Naomi Roy 6 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Sanjana Singh 6 years, 3 months ago

How

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ANSWER

How to seprate a solid from another solid??

Posted by Arsh Gulati 6 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

1. Hand picking: This method is usually used to separate undesirable substances such as small pieces of stones from wheat, rice and pulses.

2. Threshing: The process in which stalks are beaten to separate grains from the stalks, and from the chaff that covers the grains is called threshing. This method of separation is based on the fact the stalks of the crop plants and the chaff are soft materials so can be broken into pieces and the grains are very hard so it remains unaffected.

3. Winnowing: The method of separating husk from grains with the help of wind is called winnowing. This method is based on the fact that the husk is very light and the grains are comparatively heavy.

4. Sieving: Sieving is used to separate those mixtures which have components of different sizes. In this process, the mixture having components of different sizes are put in a sieve and the sieve is moved back and forth continuously. The smaller particles pass through the holes of the sieve and collect in a vessel kept below. The bigger particles remain behind in the sieve.

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ANSWER

List 3 causes of lightning and earthquake

Posted by Sakshi Raut 6 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Sushant Kr. 6 years, 3 months ago

Earthquake -1. Earthquakes can cause damage to the building, bridges, dams. 2. Earthquake in many cases, may cause great loss of life. 3. Earthquake can also cause floods and landlines.

2Thank You

ANSWER

What is sowing ?

Posted by Navratan Duggal 6 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Vatsal Gupta 6 years, 3 months ago

The process by which good quality seeds are puted into seed bed. There are mainly 2 steps by which sowing is done : 1. Traditonal method : In this process funnel like instrument is used. 2. Seed drill : It is the modern method. In this a machine is used whish distributes the seed at equal deapth.

0Thank You

Krishna Chauhan 6 years, 3 months ago

The process of scattering or putting seeds in the field either manually or an implement called seed drill is called sowing

1Thank You

Naman Rathore 6 years, 3 months ago

Sowing= it is the most important part of crop production before sowing good quality and clean and healthy seeds are selected

1Thank You

Yogita Ingle 6 years, 3 months ago

Sowing is the process of planting seeds. In sowing, generally little soil is placed over the seeds.

Sowing can be Hand sowing or (planting) in which handfuls of seed are cast over prepared ground. However mostly seed are sown using seed drill. It offers greater precision; seed is sown evenly and at the desired rate. The drill also places the seed at a measured distance below the soil, so that less seed is required.

1Thank You

Girdhar Maheshwari 6 years, 3 months ago

Sowing is an important part of crop production .before sowing a good quality,clean and healthy seeds of a good variety .farmer preferto use seeds which give high yield

1Thank You

ANSWER

What is malleability?

Posted by Ezra Naomi Roy 6 years, 3 months ago

CBSE > Class 08 > Science

4 answers

Ayushi Kapoor 6 years, 3 months ago

The property of metals that allows it to be beaten into thin sheets is called malleability.

1Thank You

Ripanjot Kaur 6 years, 3 months ago

The property which allows the metal to be hammered into thin sheets is called malleability mostly all the metals are malleable in nature

2Thank You

Aastha Verma 6 years, 3 months ago

The property of metal by which it is beaten into very thin layers of sheets is mallebility. E.g. aluminium

1Thank You

Adi Kumar 6 years, 3 months ago

The property of metals by which they can be beaten into thin sheets.

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ANSWER

we have carrots every year in winters then why it is consider in biennials?

Posted by Rudra Pratap Singh 6 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

Carrot is a biennial plant. Biennial plants complete their life cycle over two growing seasons. The first season they grow only foliage, commonly a low-growing rosette of leaves. The second growing season they form flowers and produce seeds; then, the mother plant dies.

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ANSWER

What do you mean by amplitude?

Posted by Prerana Sharma 6 years, 3 months ago

CBSE > Class 08 > Science