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Ch Sound in class 8 talks about sound is produced by vibration and in humans by larynx the vocal cords vibrates and sound is produced. Then next sound needs medium to propagate or move that is liquid, solid, gas. It propagate fastest in solids and slowest in gases and cannot propagate or move in vaccum. Then it talks about infrasonic and ultrasonic waves. That infrasonic Waves are less than 20Hertz and ultrasonic waves are more than 20,000 Hertz. Human ear can hear through 20Hertz-20,000 Hertz.The stricture of Human ear consists of outer ear pinna , middle ear stirrup, hammer, anvil (three bones of ear) , inner ear cochlea.

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Distinguish between inexhaustible natural resources and exhaustible natural resources on the basis of following parameters: (i) availability (ii) effe ts of human activities.

Posted by Manya ? 4 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Diksha Laniya 4 years, 10 months ago

Answer. Answer: *inexhaustible* these resources are present in unlimited quantity in nature and are not likely to be exhausted by human activities. ... * Exhaustible* these resources are present in limited quantity in nature and are likely to be exhausted by human activities over a certain period of time.

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कुंभनदास कौन थे? उन्हें पछतावा क्यों हुआ?

Posted by Ansh Bhandari 4 years, 10 months ago

CBSE > Class 08 > Other Subjects

1 answers

Rukaiya Majid 4 years, 10 months ago

कुम्भनदास (१४६८-१५८३) अष्टछाप के प्रसिद्ध कविथे। ये परमानंददास जी के समकालीन थे। कुम्भनदास का चरित "चौरासी वैष्णवन की वार्ता" के अनुसार संकलित किया जाता है। वल्लभाचार्य से दीक्षा ली थी।

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Economic planning by which both the state and the private sector played a role in development was called _____.

Posted by Sushil Bebartta 4 years, 10 months ago

CBSE > Class 08 > Social Science

2 answers

Mansi Yadav 4 years, 10 months ago

Mixed economic model

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Archana Bishnoi 4 years, 10 months ago

Economic planning by which both the state and the private sector played a role in development was called a Mixed Economy model.

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Is law of reflection is in all types of reflection

Posted by Sarang Laiju 4 years, 10 months ago

CBSE > Class 08 > Science

5 answers

Shivam Mahaseth 4 years, 10 months ago

Yes

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Suraj R Gowda 4 years, 10 months ago

Yes

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Kinjal Shah 4 years, 10 months ago

Yes

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Tanya Rajput 4 years, 10 months ago

Of course

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Manya ? 4 years, 10 months ago

Yes

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Imaging that you have grown up and are now a very successful person who has achieved all his or her dream you have been asked to address a gathering of young people what will you tell them

Posted by Krishna Sogarwal 4 years, 10 months ago

CBSE > Class 08 > Other Subjects

1 answers

Bhagyashri Patkari 4 years, 10 months ago

I will tell them that being a topper will give you nothing. But achieving your goal is a challenge that may become you a topper of practical knowledge and your life. Depressions and sorrows will be there but handle them and achieve your goal.

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Distinguish between unicellular and multi cellular organism

Posted by Suhani Sharma Suhani Sharma 4 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Shivam Mahaseth 4 years, 10 months ago

Organisms which is made up of only one cell is called a unicellular examples amoeba, yeast Organisms which is made up of more than one cell is called multicellular organism examples humans ,elephant

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Manya ? 4 years, 10 months ago

Organisms that are made up of a single cell are known as unicellular organisms. For eg: Amoeba and Paramecium. Organisms that are made up of many cells are known as multicellular organisms. For eg: Tree, birds, humans etc.

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Give me a very long speech on global warming

Posted by Kalp Shah 4 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Shivam Mahaseth 4 years, 10 months ago

One of the biggest problems facing the world today is global warming. Many scientists believe that our production of carbon dioxide and other greenhouse gases is having a heating effect on the atmosphere, and this could be very dangerous for human life. This essay will examine the problem of global warming and suggest some ways of solving the problem. Many problems could result from global warming. One of the biggest problems is rising sea level. This could result in the flooding of low lying coastal areas and cities, such as Egypt, the Netherlands, and Bangladesh. Some countries might even disappear completely! Another problem caused by global warming is changes in weather patterns. Many areas of the world are experiencing increased hurricanes, floods, and other unusual weather. A third problem associated with global warming is the effect on animals. Fish populations could be affected, while some insects which spread disease might become more common. There are several things we can do to solve the problem of global warming. One solution is to stop producing C02. We can do this by switching from oil, coal and gas to renewable energy. Another solution is to plant more trees. Trees absorb carbon dioxide and produce oxygen, which is not a greenhouse gas. A third solution is to use less energy and to recycle more products. Generating electricity is one of the main sources of carbon dioxide. If we use less electricity, we will produce less C02. In conclusion, if we make small changes now in the way we live, we can avoid huge changes in the future. Scientists, governments and individuals must work together to overcome this threat.

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Diksha Laniya 4 years, 10 months ago

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Please add a moral science, general knowledge and EVS book please CBSE guide...

Posted by Diksha Laniya 4 years, 10 months ago

CBSE > Class 08 > Other Subjects

1 answers

Diksha Laniya 4 years, 10 months ago

Just shut up ok

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What is noise pollution?

Posted by Diksha Laniya 4 years, 10 months ago

CBSE > Class 08 > Other Subjects

1 answers

Mallikarjun H M 4 years, 10 months ago

unplesent or unwanted voice is called noise pollution

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What is the land pollution?

Posted by Diksha Laniya 4 years, 10 months ago

CBSE > Class 08 > Other Subjects

1 answers

Sriya Misra 4 years, 8 months ago

Soil contamination or soil pollution as part of land degradation is caused by the presence of xenobiotics chemicals or other alteration in the natural soil environment. It is typically caused by industrial activity, agricultural chemicals or improper disposal of waste

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What is the water pollution?

Posted by Diksha Laniya 4 years, 10 months ago

CBSE > Class 08 > Other Subjects