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

When CFCs come into contact with ozone in the stratosphere, they destroy ozone molecules.Ozone layer is found in stratosphere protects the earth from harmful UV rays. The ozone layer in the stratosphere absorbs a portion of the radiation from the sun, preventing it from reaching the planet's surface. Most importantly, it absorbs the portion of UV light called UVB. UVB has been linked to many harmful effects, including skin cancers, cataracts, and harm to some crops and marine life. Hence, statement B is true.

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What is meant by charging by friction

Posted by Saksham Shane 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 7 months ago

Rubbing two different materials together, a process known as charging by friction. Since the two objects are made of different materials, their atoms will hold onto their electrons with different strengths.Rub a piece of ebonite (very hard, black rubber) across a piece of animal fur. The fur does not hold on to its electrons as strongly as the ebonite. At least some of the electrons will be ripped off of the fur and stay on the ebonite. Now the fur has a slightly positive charge (it lost some electrons) and the ebonite is slightly negative (it gained some electrons).

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What is soda fire extinguisher

Posted by Crewfighter 5775 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Aditya Narayan Singh 5 years, 7 months ago

Soda acid type extinguisher act by cutting off supply of air. It acts on all types of fire except due to electrical and inflammable liquids .

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A paper pin is fixed at a distance of 5cm from a plane mirror and sumit located his image by drawing incident and reflected ray. At what distance from the mirror the image formed? Give reason

Posted by Nagashni Shaji 5 years, 7 months ago

CBSE > Class 08 > Science

0 answers

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How many platelet are there in our body

Posted by Maseera Tamsil Bepari 5 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Shakuntala Putane 5 years, 7 months ago

150,000 to450,000

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Aditya Narayan Singh 5 years, 7 months ago

150,000 to 450,000

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Type of polyster

Posted by Pawan Kumar 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 5 years, 7 months ago

Polyester is made up of many units of an ester.
It is suitable for making dress material because it is easy to wash and stays crisp and wrinkle-free.
Terylene is a known polyester.
PET (Polyethylene terephthalate) is used to make many useful products like bottles, utensils, films, wires.

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what do you mean by eggs produced in frogs? give reason also. why it occurs?

Posted by N Ayana 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 7 months ago

Frogs lay eggs. This process usually occurs through external fertilization, where the female releases her eggs from her body into water. Then, the male releases his sperm to fertilize them. However, a few species of frog use internal fertilization. In this case, the eggs are fertilized inside the female’s body before they are released.

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Explain why plastic containers are favoured for storing food.

Posted by Rajput Gamer 5 years, 7 months ago

CBSE > Class 08 > Science

3 answers

Hamza Khan 5 years, 7 months ago

because #they are light weighted #durable

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Pawan Kumar 5 years, 7 months ago

We can use nitrogen for save food long days

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Yogita Ingle 5 years, 7 months ago

Food can be stored in plastic containers because:
(a) Plastics are non-reactive.
(b) Plastics are light and strong.
(c) Plastics are durable.

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Tell about cell give me all tje imformation about cell

Posted by Ravi Shukla 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 7 months ago

The cell is the basic structural, functional, and biological unit of all known organisms. A cell is the smallest unit of life. Cells are often called the "building blocks of life". Cells consist of cytoplasm enclosed within a membrane, which contains many biomolecules such as proteins and nucleic acids. The number of cells in plants and animals varies from species to species, it has been estimated that humans contain somewhere around 40 trillion. Cells are of two types: eukaryotic, which contain a nucleus, and prokaryotic, which do not. Prokaryotes are single-celled organisms, while eukaryotes can be either single-celled or multicellular.

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How the friction is type of contact force?

Posted by Deepal Parmar 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Saksham Shane 5 years, 7 months ago

Pta Nhi Bhai answer

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Meaning of sexual reproduction

Posted by Vidya P Choudhary 5 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Hamza Khan 5 years, 7 months ago

fusion of male and female gamates is called sexual reproduction

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Pandey Sk 5 years, 7 months ago

Sexual reproduction is a type of reproduction in which involves Male and female gamates .

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What is speed of sound

Posted by Ramneek Bathla 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Shivani K 5 years, 7 months ago

In air it is 330 m/ s( approximately)

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Hi friends?can you say what is the meaning of sonar and its fullform

Posted by Nishanrh Recharla Recharala 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Anil Kumar 5 years, 7 months ago

Sound navigation and ranging

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L = 18 keywords answers

Posted by Aashish Verma 5 years, 7 months ago

CBSE > Class 08 > Science

0 answers

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Causes of lightning

Posted by Ananya.M Sheela 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 7 months ago

Lightning is an electrical discharge caused by imbalances between storm clouds and the ground, or within the clouds themselves. Most lightning occurs within the clouds.

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The element X is a highly reactive metal.It easily reacts air and moisture. To prevent this by reaction X is stored in kerosene what is X? (A)zn (B)p (C)na (D)fe

Posted by Shivam Jha 5 years, 7 months ago

CBSE > Class 08 > Science

5 answers

Nishanrh Recharla Recharala 5 years, 7 months ago

Na or sodium

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Smita Tripathi 5 years, 7 months ago

na means sodium

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Smita Tripathi 5 years, 7 months ago

zn means Zinc

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Smita Tripathi 5 years, 7 months ago

P for Potassium

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Shivam Jha 5 years, 7 months ago

Na means sodium

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Mercury is used in thermometers because:

Posted by Shivam Jha 5 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Yogita Ingle 5 years, 7 months ago

1. Mercury is the only element which has a large value of coeffcient of expansion.

2. When it is used in the thermometer, a very little change in the temperature can be found out.

3. It has the capability to measure temperatures that are high.

4. It does not get sticked to the surface of the thermometer which is made of glass.

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Arpan Naskar 5 years, 7 months ago

It is not a good conductor of heat thats why.If it would have been a good conductor, the thermometer would burst in our body heat.

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Non-metal used in water purification process

Posted by Shivam Jha 5 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Nishanrh Recharla Recharala 5 years, 7 months ago

Chlorine

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Shivam Jha 5 years, 7 months ago

Cloriene

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What is asexul reproduction ? Give example

Posted by Rani Kumari 5 years, 7 months ago

CBSE > Class 08 > Science

2 answers

Smita Tripathi 5 years, 7 months ago

In Asexual reproduction, only a single parent is involve to produce offsprings ...

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Yogita Ingle 5 years, 7 months ago

Asexual reproduction is a mode of reproduction in which the new offspring arise from a single parent. The offsprings are identical to each other, both physically as well as genetically. They are the exact copies of their parent cell. Hence, they are ‘clones’. We observe asexual reproduction in both unicellular and multicellular organisms.

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Which of the following substance will allow current to pass through them . (A) . Lemon juice + water (B) . Milk

Posted by Rani Kumari 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Shivam Jha 5 years, 7 months ago

A. Lemon juice+watet

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Apple ka colour kon sa wire me hota hai positive terminal ya nagitive terminal kon sa colour hota hai

Posted by Sonam Kumari 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Shivam Jha 5 years, 7 months ago

Positive trrminal

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What is meant by Green revolution

Posted by Mithun M 5 years, 7 months ago

CBSE > Class 08 > Science

1 answers

Meghna Thapar 5 years, 7 months ago

Green revolution is defined as an increase in crop production because of the use of new varieties of seeds, the use of pesticides and new agricultural techniques.

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What is ment by green

Posted by Mithun M 5 years, 7 months ago

CBSE > Class 08 > Science