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

The Universe is thought to consist of three types of substance: normal matter, 'dark matter' and 'dark energy'. Normal matter consists of the atoms that make up stars, planets, human beings and every other visible object in the Universe.

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Describe an experiment to prove that sound cannot travel through vacuum

Posted by Sunny Pandit 3 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Sunny Pandit 3 years, 3 months ago

And describe which type of sound gets

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Prithviraj Singh Dayatar 3 years, 3 months ago

my name is Prithviraj

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Prithviraj Singh Dayatar 3 years, 3 months ago

hii

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Prithviraj Singh Dayatar 3 years, 3 months ago

As the air is pumped out of the sealed bell jar, the sound from the bell jar fades. .

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Prithviraj Singh Dayatar 3 years, 3 months ago

wait

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Synthetic fibres dry up_____

Posted by Deepak Singh Kushwah 3 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Purvi Pragati Hota 3 years, 2 months ago

Synthetic fibre dry up comparatively faster than natural fibre.

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Prithviraj Singh Dayatar 3 years, 3 months ago

obviously cotten or wool

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Tell any scientific facts

Posted by Simranpreet Kaur 3 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Simranpreet Kaur 3 years, 2 months ago

Thanku very much

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Tanu Chaudhary 3 years, 3 months ago

Sun is actually white we see it yellow because of oxygen.

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Prithviraj Singh Dayatar 3 years, 3 months ago

easy , ?In human terms, that is equivalent to a 6-foot person jumping 780 feet into the air. ... Snakes are true carnivores because they eat only other animals and do not eat any type of vegetation.

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Metal+oxygen=??

Posted by Fatima Rahman❣️❣️ 3 years, 3 months ago

CBSE > Class 08 > Science

4 answers

Rajni Maheshwari 3 years, 3 months ago

Metallic oxide

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Kavya Dixit 3 years, 3 months ago

Metallic oxides

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Sparsha N S 3 years, 3 months ago

Metallic oxides

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Hiya Dhawan 3 years, 3 months ago

Metallic oxides

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Sketch of human nerve cell .

Posted by Kavya Dixit 3 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Kavya Dixit 3 years, 3 months ago

Thanks

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Jegannathan R 3 years, 3 months ago

https://photos.app.goo.gl/GUonhurUqJvH6N828

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Differentiate between Mass & Weight

Posted by Akanksha Yadav 3 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Fatima Rahman❣️❣️ 3 years, 3 months ago

In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight is the force exerted on an object by gravity. ... Objects on the surface of the Earth have weight, although sometimes the weight is difficult to measure.

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carrier of malaria cousing protozoa is :

Posted by Prithviraj Singh Dayatar 3 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Selina Sultana 3 years, 2 months ago

Anophles bacteria caused malaria

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Purvi Pragati Hota 3 years, 2 months ago

Carrier of malaria causing mosquito is Female Anopheles mosquito. Malaria causing protozoa is Plasmodium.

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Prithviraj Singh Dayatar 3 years, 3 months ago

female anopheles mosquito

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Can a wire be drawn out of wood . Why not

Posted by Parth Pimpalkar 3 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Fatima Rahman❣️❣️ 3 years, 3 months ago

A wood does not have a property of ductility as it is a non metal therefore we cannot draw wires from wood

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Prithviraj Singh Dayatar 3 years, 3 months ago

A wood does not have a property of ductility as it is a non metal therefore we cannot draw wires from wood .

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What are pathogens how are they transmitted

Posted by Sameer Ansari 3 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Rajni Maheshwari 3 years, 3 months ago

Pathagones are the diseases causing microorganisms.

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Kavya Dixit 3 years, 3 months ago

Pathogens are the disease causing microorganisms. It is also called germs. Pathogens are transmitted by food, water,air and physical contact.

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Anushka Giri Anushka Giri 3 years, 3 months ago

Pathagens are the disease causing microorganisms. It is also called germs. Pathagens are transmitted by food, water,air and physical contact.

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where did hook demonostrate his observation on cork slice

Posted by Samiya Saleem 3 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Kusum Kanera 3 years, 3 months ago

Cels

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Five requirements essential for obtaning good crop production

Posted by Tabish Jan Tabish Jan 3 years, 3 months ago

CBSE > Class 08 > Science

0 answers

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What are the two sources of synthetic fibres

Posted by Eshwar V.S 3 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Sonu Yadav 3 years, 3 months ago

Plastic

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Jesalini M.J 3 years, 3 months ago

Plants and animals

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Riya Dhaker 3 years, 3 months ago

Plants and animals

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Pratham Bhavsar 3 years, 3 months ago

Plants and Animals

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Prakhar Kumar 3 years, 3 months ago

(I) Plant material (II) Minerals

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Write two parts of plant

Posted by Umashankar Sharma 3 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Akshita Bajaj 3 years, 2 months ago

Anther and stigma

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Rajni Maheshwari 3 years, 3 months ago

Flowers and leaves

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Kavya Dixit 3 years, 3 months ago

Root and shoot

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Jesalini M.J 3 years, 3 months ago

Roots and leaves

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T. Dhivya Varshni 3 years, 3 months ago

The two main parts of a plant are root and leaves.

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Who invented the first vaccine and when? Name the first vaccine.

Posted by Athul Shiju 3 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Rajni Maheshwari 3 years, 3 months ago

Eward Jenner discovered the first vaccine for small pox in 1798

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Kavya Dixit 3 years, 3 months ago

The smallpox vaccine, introduced by Edward Jenner in 1796, was the first successful vaccine to be developed. He observed that milkmaids who previously had caught cowpox did not catch smallpox and showed that inoculated vaccinia protected against inoculated variola virus.

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T. Dhivya Varshni 3 years, 3 months ago

Edward Jenner

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Vivek Yadav 3 years, 3 months ago

Edward Jenner

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Apu Nath 3 years, 3 months ago

Edward Jenner discovered the vaccine for small pox in 1798

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Why are Children/infants given vaccination

Posted by Suhani Asawa 3 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Purvi Pragati Hota 3 years, 2 months ago

As we know that vaccination is a simple , safe and effective way of protecting people against harmful disease before they come in contact with them. So children or infants were given vaccination to protect them from pathogens before they come in contact with them or can cause any disease.

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Rajni Maheshwari 3 years, 3 months ago

Because of cause of polio

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Vivek Yadav 3 years, 3 months ago

Due to cause of polio

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Q. How a baby born what is the process known as Ans. Chudi

Posted by Rajat Kumar X 3 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Sameer Ansari 3 years, 3 months ago

What are pathogens how are they transmitted

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Shreya Shree 3 years, 3 months ago

This is very cuk......okk

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Rajat Kumar X 3 years, 3 months ago

Also known as xxx.com

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A PLESANT AND SMOOTHING SOUND

Posted by Kanha Sindhi 3 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Sandra Salin 3 years, 3 months ago

Musical sound

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How is yeast helpful in the process of fermentation?

Posted by Preetha G 3 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Jesalini M.J 3 years, 3 months ago

Yes

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Rajni Maheshwari 3 years, 3 months ago

Yeast is very useful during fermentation because yeast cells converts cereals derived sugar into enthol and co2

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Shreya Dubey 3 years, 3 months ago

During fermentation , yeast cells convert cereals-derived sugar into ethanol and CO 2

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Give reason for the following. a) Sodium and potasium are stored in kerosene?

Posted by Akriti Akriti 3 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Nandni K 3 years, 3 months ago

& can catch fire easily..if they will be in contact with air & water

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Nandni K 3 years, 3 months ago

They react vigorously with air & water. Hence, they are stored in kerosene.

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Define natural resources

Posted by P.Avinash Poosarla 3 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Akshita Bajaj 3 years, 2 months ago

Resources that occurs naturally are called as natural resources

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Nivedita Janu 3 years, 3 months ago

Resources that is a physical material that humans needs and value such as land ,water, air

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Which is beaten into thin sheets

Posted by Moksha Tamada 3 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Jesalini M.J 3 years, 3 months ago

Malleability

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Vivek Yadav 3 years, 3 months ago

Malleability

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Nandni K 3 years, 3 months ago

The substance which have mallebilitiy

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Sahil Sk 3 years, 3 months ago

Metal like iron gold

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Navya Niharika A - 3 3 years, 3 months ago

Metals

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Name the following The chemical weedicide

Posted by Dev Rajput 3 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Jesalini M.J 3 years, 3 months ago

2-4D

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Vivek Yadav 3 years, 3 months ago

Fertilizer

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Rishikesh Subash 3 years, 3 months ago

2,4D is one of most famous chemical weedicide used for the weeding process

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Science chapter 3 all question anwer

Posted by Atikur Malek 3 years, 3 months ago

CBSE > Class 08 > Science

0 answers

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Name the main component air ?

Posted by Rizul Sharma 3 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Jesalini M.J 3 years, 3 months ago

Nitrogen

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Shreya Dubey 3 years, 3 months ago

Food obtained with the help microorganisms are : 1) Bread 2) Beer 3) Wine 4) Vinegar 5) Yoghurt & 6) Cheese as well as fermented fish , meat and vegetables.

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Nandni K 3 years, 3 months ago

Nitrogen is found the most in air

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Rizul Sharma 3 years, 3 months ago

Name few food products that are obtained with the help of micro -organisms?

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Ayush Thakur 3 years, 3 months ago

Benjamin

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Atom, symbol,electron number in the element , distribution of electron , electron configuration numerical form