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

An echocardiogram is a test that uses sound waves to create pictures of the heart. The picture is more detailed than a standard x-ray image. An echocardiogram does not expose you to radiation.

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magnitude of two mutually perpendicular vector are 2 and 3 respectively find the resultant of 2pvector+qvector

Posted by Ritik Dhakad 7 years, 3 months ago

CBSE > Class 08 > Science

0 answers

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what happen when non metals react with oxygen

Posted by Vanshika Bhatia 7 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Varinda Bhatnagar 7 years, 3 months ago

They form oxides

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Kbs Chahar 7 years, 3 months ago

Forms non metallic oxide

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Vaishnavi ? Nayak 7 years, 3 months ago

I mean they form non metallic oxide

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Vaishnavi ? Nayak 7 years, 3 months ago

When non metals react with oxygen the for non metallic oxide

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Jujhar Kundal 7 years, 3 months ago

Non metal oxide is formed

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How deforestation also lead to a decrease in a water holding capacity of the soil ?

Posted by Abhipsha Sahoo? 5 years, 9 months ago

CBSE > Class 08 > Science

6 answers

Abhipsha Sahoo? 7 years, 3 months ago

Kanwali singh Yes it's ok

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Abhipsha Sahoo? 7 years, 3 months ago

Hii

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Jujhar Kundal 7 years, 3 months ago

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Kanwalji Singh 5 years, 9 months ago

Is the ans ok ???

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Kanwalji Singh 7 years, 3 months ago

Deforestation leads to soil erosion; as the top soli get eroded the lower hardy & rocky surface with less humus gets exposed . However ; continued soil erosion can lead to desertification . As the hard & rocky soil can't absorb water thus deforestation leads to decrease in water holding capacity of the soil .

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Nikhil Pandit Ji 7 years, 3 months ago

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Why do plastics find excessive use in medical centres

Posted by Ashok Mishra 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Abhipsha Sahoo? 7 years, 3 months ago

Because plastics are non reactive so that they do not react with any chemicals .... such as medicine and it have other properties also like they are cheap, light etc..

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Please give blue print

Posted by Harsh Rai 7 years, 3 months ago

CBSE > Class 08 > Science

3 answers

K Sai Dhruvan 7 years, 3 months ago

No बहुत अच्छा

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Jujhar Kundal 7 years, 3 months ago

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Aashu Kumar 7 years, 3 months ago

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Difference between free charge and bound charge??

Posted by Ajay Thakur 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 3 months ago

A free charge is not bound to the nucleus and can have any energy from zero. Further, the energy possessed by it is always kinetic in nature. A bound charge, on the other hand, is bound to the nucleus and can have only quantized energies. The energy possessed by it is both potential and kinetic in nature with potential energy being greater always.

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Describe how coal is formed from dead vegetation. What is process called.

Posted by Meena Thevar 7 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Jujhar Kundal 7 years, 3 months ago

I also have no idea

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Abhipsha Sahoo? 7 years, 3 months ago

About 300 millions years ago the earth had dense forest in low dying wetland areas . Due to natural processes, like flooding, these forest got buried under the soil. As more soil deposited over them,they were compressed. The temperature also rose as they sank deeper and deeper . Under high pressure and high temperatures, dead plants got slowly converted to coal. As coal contains mainly carbon , the slow process of conversation of dead vegetation into coal is called carbonisation.

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Shivani Garg 7 years, 3 months ago

Coal is formed by the anaerobic thermal degradation of dead vegetation deep inside the earth. Wood under the effect of high temperature, high pressure and in the absence of air gets converted to coal through a number of steps. This process is called carbonisation

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Yogita Ingle 7 years, 3 months ago

Millions of years ago, dense forest and animal got buried under the soil due to natural process like floods, earthquakes and thunder storms. When they got buried deep in the soil, they were exposed to very high pressure and temperature. Under these conditions, these slowly got converted into coal. This process of formation of coal vegetation is called carbonization.

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Pooja Singh 7 years, 3 months ago

I have no idea

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Sample page of science class 8 cbse

Posted by Sakshi Singh 7 years, 3 months ago

CBSE > Class 08 > Science

0 answers

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Who discovered fermentation? ?

Posted by Maithli Chetnani 7 years, 3 months ago

CBSE > Class 08 > Science

3 answers

Kbs Chahar 7 years, 3 months ago

Louis Pasteur

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Sikun Sahoo 7 years, 3 months ago

Louis Pasteur discover fermentation in 1857

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Sonali Aggarwal 7 years, 3 months ago

Fermentation was discovered by Louis Paster in 1857.The process of conversion of sugar into alcohol by the action of yeast is called fermentation.

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What are petlolium?

Posted by Ansh Kumar 7 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Sonali Aggarwal 7 years, 3 months ago

Petroleum (also known as crude oil or simply oil) is a fossil fuel that was formed from the remains of ancient marine organisms. Millions of years ago, algae and plants lived in shallow seas. After dying and sinking to the seafloor, the organic material mixed with other sediments and was buried.Over millions of years under high pressure and high temperature, the remains of these organisms transformed into what we know today as fossil fuels.Coal,Natural Gas and petroleum are all fossil fuels that formed under similar conditions.

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Maithli Chetnani 7 years, 3 months ago

Fossil fuel

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Same type of plant grown in a large scale

Posted by Kaira Soni 7 years, 3 months ago

CBSE > Class 08 > Science

5 answers

Kbs Chahar 7 years, 3 months ago

The same kind of plant grown in a large scale is called as crop .

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Maithli Chetnani 7 years, 3 months ago

Crop

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Rekha Singh 7 years, 3 months ago

CROP

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Sai Kumbhar 7 years, 3 months ago

Crop

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Neha Choudhary 7 years, 3 months ago

Crop

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What is agricultural implements

Posted by Anurag Raheza 7 years, 3 months ago

CBSE > Class 08 > Science

6 answers

Kbs Chahar 7 years, 3 months ago

The tools which are used for agriculture practices are called agricultural implements for eg plough ,harrow ,khurpi etc .

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Adnan Lohawala 7 years, 3 months ago

the tools used for agriculture eg-plough, khurpa, cultivator, seedrill

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Rekha Singh 7 years, 3 months ago

These are the tools used in farming

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Sai Kumbhar 7 years, 3 months ago

IDK

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Mansi Kumari 7 years, 3 months ago

THE MATERILS WHICH ARE NEEDED TO GROW CROPS ARE CALLED AGRICULTURE IMPLEMENT

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Anurag Raheza 7 years, 3 months ago

I don't know

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Define coal tar

Posted by Harmandeep Singh 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Deepak Chetry 7 years, 3 months ago

It is a black, thick liquid with an unpleasant smell. It is a mixture of as a fuel in many industries situated near the coal processing plants.

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Which was the first mammal in the earth

Posted by Abhinav Adarsh 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Saloni Gupta 7 years, 3 months ago

shrew

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crop rotation ka matlab

Posted by Saloni Gupta 7 years, 3 months ago

CBSE > Class 08 > Science

2 answers

Kbs Chahar 7 years, 3 months ago

Crop rotation means growing different crops in different seasons like legumes and non legumes crops are grown alternatively .

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Saloni Gupta 7 years, 3 months ago

???????????????????

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What are sperms

Posted by Aayush Meel 7 years, 3 months ago

CBSE > Class 08 > Science

1 answers

Sonali Aggarwal 7 years, 3 months ago

Sperm is the male reproductive cell.

Sperm cells cannot divide and have a limited life span, but after fusion with egg cells during fertilization, a new organism begins developing, starting as a totipotent zygote.

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The colur of upper most layer in candle flame

Posted by Bhagwan Bidgar 7 years, 3 months ago

CBSE > Class 08 > Science