CBSE > Class 10 | CBSE Board | Homework Help

It is a condition which causes a softening of the tooth enamel. It happens when biological bacteria in our mouth produces sufficient acids from sugars to Decay the enamel of dentine

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Yogita Ingle 5 years, 6 months ago

Tooth decay occurs at an acidic pH around 5 or below. The microorganisms of the mouth converts sugars into acids, resulting in decrease of the pH of the saliva. In the presence of these acids, the enamel of the teeth is degraded, and it leads to tooth decay.

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A plus b Ka hol square

Posted by Kashish Chahar 5 years, 6 months ago

CBSE > Class 10 > Mathematics

4 answers

Yangzee Sherpa 5 years, 6 months ago

“a^2+2ab+b^2” HoPe It HeLpS yOu??

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Ajin Ajin 5 years, 6 months ago

a2 + 2ab + b2

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Ajin Ajin 5 years, 6 months ago

a²+b²+2ab I HOPE IT HELPS YOU

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Nidhi Jain 5 years, 6 months ago

a²+b²+2ab

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शाम बहुत मधुर गाता है | इस वाक्य में से मधुर शब्द का पद परिचय है

Posted by Munmun Das 5 years, 6 months ago

CBSE > Class 10 > हिंदी ए

3 answers

Pooja Ntse 5 years ago

visheshan

5Thank You

Bijendar Kumar 2 years, 2 months ago

plz answer this

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Seema Choudhary 5 years, 6 months ago

Madhur is visheshan(Adjective)

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Why does leaf appear green????

Posted by Anshuman Omm 5 years, 6 months ago

CBSE > Class 10 > Science

5 answers

Anshuman Omm 5 years, 6 months ago

Because chlorophyll reflects away the green wavelength of light and absorbs mainly red and blue wavelengths.

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Bhumika Badgoti 5 years, 6 months ago

Because of chlorophyll.It provide green colour pigment.

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Sanika Walimbe 5 years, 6 months ago

Because it reflects green light which s not essential for photosynthesis

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Nirav Jain 5 years, 6 months ago

Because of chlorophyll

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Kashish Chahar 5 years, 6 months ago

Bcause of chlorophyll

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ASSIGNMENT -5 Open a writer window. Insert a smiley face a rounded rectangle and a pointed rectangle on the document. Include the three drawings into single group Next, reduce the size of the smiley face and increase the size of the rounded rectangle an keep the third figure unchanged.

Posted by Sukhpal Kaur Sohal 5 years, 6 months ago

CBSE > Class 10 > Computer Applications (165)

0 answers

ANSWER

When the Terminals of a cell are Connected to the Ends of an Iron Rod, electric current Flows through the Rod. When the Terminals are Connected to the Ends of a Wooden Rod, no current flows. Explain why, when the wooden rod also has a large number of electrons

Posted by Samraat Sahil Verma 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Riya Philip 5 years, 6 months ago

Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

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How Romanticism are related to nationalism

Posted by Samraat Sahil Verma 5 years, 6 months ago

CBSE > Class 10 > Social Science

1 answers

Yogita Ingle 5 years, 6 months ago

Romanticism is a cultured movement focused on emotion and mystical feeling insted of reason and science to develop nationalist sentiment. They helped create a sence of collective heritage and cultural past as part of nation bilding through use of folk songs, dances & music. Romantics such as JOHANN GOTTFRIED claimed true german culture was to discoverd among common people 'das volk' .

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What is hardware

Posted by Soniya Chaudhary 5 years, 6 months ago

CBSE > Class 10 > Computer Applications (165)

1 answers

Shivam Kumar 5 years, 6 months ago

Hardware is the components of computer which help to run the software of the computer.

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ANSWER

Which element has

Posted by Arsh Bajwa 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Riya Philip 5 years, 6 months ago

Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

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What is the work of lipase and trypain

Posted by Satyam Lodhi Rajput 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 6 months ago

TRYPSIN: Protein Digestion.It also activates other trypsinogen molecules, as well as other protein-digesting enzymes secreted as proenzymes with pancreatic juice. Therefore, trypsin is essential for normal function of digestive processes that convert food proteins into amino acids for absorption.

LIPASE: Lipase is an enzyme that breaks down dietary fats into smaller molecules called fatty acids and glycerol. A small amount of lipase, called gastric lipase, is made by cells in your stomach. This enzyme specifically digests butter fat in your food.

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If in a triangle ABC , right angle at c if tan A=1√3 and tan B=√3 then probe that sinAcosB+casAsinB=1

Posted by Nancy Yadav 5 years, 6 months ago

CBSE > Class 10 > Mathematics

2 answers

Riya Philip 5 years, 6 months ago

Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

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Yogita Ingle 5 years, 6 months ago

Δ ABC is a Right Triangle at ∠C = 90°

To Find:

sin A × cos B + cos A × sin B = ?

Solution:

Δ ABC is a Right Triangle at ∠C = 90° .......Given

Also

Therefore,

∠ A = 30°

Now in ΔABC

.........angle sum Triangle property

substituting the values we get

So the value of

sin A × cos B + cos A × sin B =

Therefore

sin A × cos B + cos A × sin B = 1

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ANSWER

Explain the limitations of civil disobedience movement?

Posted by Muskan Kumari 5 years, 6 months ago

CBSE > Class 10 > Social Science

1 answers

Yogita Ingle 5 years, 6 months ago

Limited participation of Dalits: Dalits participation in the civil Disobedience movement was very limited, particularly in Maharashtra and Nagpur region where their organization was quite strong.
No Participation of Muslims: Some of the Muslim political organizations in India were also Lukewarm in their response to the Civil Disobedience Movement. After Non-Cooperation-Khilafat movement Muslims felt alienated from the congress.
Dominant role of Sanatanis and Hindu Mahasabha: The role of Sanatanis and Hindu Mahasabha was very dominant. Due to the fear of Sanatanis the conservative high class Hindus, congress ignored the Dalits. Congress was very close to Hindu Mahasbha. Hindus Mahasabha strongly opposed the efforts of compromise between Congress and Muslim League.
Clash between BR Ambedkar and Mahatma Gandhi: In 1930 Dr B R Ambedkar clashed with Mahatma Gandhi at the second-round table conference by demanding separate electorate for Dalits.
Participants have different aspirations: Participation had their own aspirations. There was a contrast between the demands of industrialist and working class. Contrast was also there in the demand of Rich peasants and poor peasants. United struggle was not there.

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Why is it necessary to learn English?

Posted by Anas Siddiqui 5 years, 6 months ago

CBSE > Class 10 > English Language and Literature

4 answers

Arpita .9 5 years, 6 months ago

It is not necessary.

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Seema Choudhary 5 years, 6 months ago

As we know that English is an international language so it is important to learn it. Suppose you are interested to go abroad for the reason of any work you must know English atleast to communicate...

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Sushmita Singh 5 years, 6 months ago

Because this language will become the partner of yours in the future.

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Dhyey Sonani 5 years, 6 months ago

Because it is use in whole world

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Mention any 5 features which make a India federal county

Posted by Bitarnna Swetasini 5 years, 6 months ago

CBSE > Class 10 > Social Science

2 answers

Yogita Ingle 5 years, 6 months ago

1)Our country is ruled by two forms of governments- central and state government.
2)As in a federal nation, each type of government can not interfare in other one’s issues.
3)Seperate jurisdiction is meant for them.
4)Elections for each government are held saperately, this proves India is Federal nation.
5)Division of power.

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Shtri Sakti 5 years, 6 months ago

1.there are two or more level of govt. 2.diff. Tiers of govt. Govern same citizen,but each tier has its own jurisdiction 3.courts have the power to interpret the constitution & the power of diff. Levels of govt. 4.sources of revenue for each level of govt are specified to ensure it's autonomy

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What is the pH of gastric juice,which is released during digestion.

Posted by Goplani Aesha 5 years, 6 months ago

CBSE > Class 10 > Science

3 answers

Satyam Lodhi Rajput 5 years, 6 months ago

Is 2

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Aaditri Kumari 5 years, 6 months ago

2.5 to 3.5

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Shtri Sakti 5 years, 6 months ago

The pH of gastric acid is 1.5 to 3.5 in the human stomach lumen

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Internet was found in

Posted by Anshika Rajput 5 years, 6 months ago

CBSE > Class 10 > Computer Applications (165)

0 answers

ANSWER

Why did Nationalist tensions emerge in the balkans question mark

Posted by Jasveer Bhavani 5 years, 6 months ago

CBSE > Class 10 > Social Science

2 answers

Riya Philip 5 years, 6 months ago

Join betternation.xyz This is a site where u can have a lot of friends and fun ? ? ?

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Yogita Ingle 5 years, 6 months ago

Nationalist tensions emerged in the Balkans because of the spread of ideas of romantic nationalism as also the disintegration of the Ottoman Empire that had previously ruled over this area. The different Slavic communities in the Balkans began to strive for independent rule. They were jealous of each other and every state wanted more territory, even at the expense of others. Also, the hold of imperial power over the Balkans made the situation worse. Russia, Germany, England, Austro-Hungary all wanted more control over this area. These conflicts ultimately led to the First World War in 1914.

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Notes for "Our Environment"

Posted by Kanika .... 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Shtri Sakti 5 years, 6 months ago

CBSE Class 10 Science Revision Notes CHAPTER – 15 OUR ENVIRONMENT Environment means everything which surrounds us. It may include living (biotic) and non-living (abiotic) components.Biotic : Plants and animals. Abiotic : Air, water etc.Environment affect the life and development of an organism in its natural habitat & vice a versa.Substances that can be decomposed by the action of micro-organism like bacteria are called bio-degredable. E.g. organic wastes.Substances which cannot be decomposed by the action of microorganisms are called non-biodegradable.Example of biodegradable wastes : cattle dung, cotton, jute, paper, fruit and vegetable peels, leaves etc.Examples of non-biodegradable wastes : plastics, polythene bags, synthetic fibres, metals, radioactive wastes. ECO SYSTEM & ITS COMPONENT All the interacting living organisms in an area together with non living components form an ecosystem. So an ecosystem consists of both biotic(living creatures) and abiotic components like temperature, rainfall, wind, soil etc. All living organisms are classified on the basis nutrition. I. Producers : All green plants, blue green algae can produce their food (Sugar & starch) from inorganic substance using light energy (Photosynthesis). II. Consumers : Include organisms which depend on the producers either directly or indirectly for their sustenance. Consumers depend on others for food. III. Decomposeres : Fungi & Bacterias which break down(decompose) the dead plant, animals complex compounds into the simpler one. Thus decomposeres help in the replenishment A 3- Step Food Chain Food Chain : It is the sequence of living organisms in which one organism consumes another organism for energy. It is unidirectional(single directional). In a food chain, various steps where transfer of energy takes place is called a trophic level.The green plants capture 1% of sun’s energy.The flow of energy is unidirectional in a food chain.There is gradual decrease in the amount of energy from one trophic level to next trophic level in a food chain. 10 Percent Law : The energy available at each successive trophic levelis 10% of the previous level. So only 10% of Energy is transferred to next trophic level while 90%of energy is used by present trophic level in its life processes. The concentration of harmful chemical increases with every next trophic level in a food chain. It is called Bio-magnificationMaximum concentration of such chemicals get accumulated in human bodies. Since humans occupy the top level in any food chain. ENVIRONMENTAL PROBLEMS Changes in environment affect us and our activities change the environment around us. Environmental problems caused by humans: (a) depletion of the Ozone Layer and waste disposal. (b) pollution due to mismanagement of waste disposal. I. Depletion of Ozone Layer Ozone (O3) layer is largely found in the stratosphere which is a part ofour atmosphere from 12 km – 50km above sea level.Ozone is a deadly poison at the ground level.Ozone is formed as a result of a following photochemical reaction. Ozone layer is a protective blanket around earth which absorbs most of the harmful U.V. (Ultraviolet) radiation of the Sun, thus protecting the living beings of the earth from health hazards like skin cancer, cataract in eyes, weaken immune system, destruction of plants etc.The decline of Ozone layer thickness in Antartica was first observed in 1985 and was termed as OZONE HOLE. Reason of Ozone Depletion Excessive use of CFCs (Chloro Flouro Carbon) a synthetic, inert chemical E.g. Freon which are used as refrigerants and in fire extinguishers, caused Ozone depletion in the upper atmosphere. A single chlorine atom can destroys 1,00,000 Ozone molecules. U.N.E.P. (United Nation Environment Programme)did an excellent job in forging an agreement to freeze CFC production at 1986 levels (KYOTO Protocol) by all countries. Garbage Disposal Industrialization and rise in demand of consumer goods have created a major problem in the form of wastes/garbage accumulation and its disposal specially in urban area. The different methods of solid wastes disposal commonly used around the world are. 1. Open dumping : A conventional method in which solid wastes dumped in selected areas of a town. It actually cause pollution 2. Land fillings : Wastes are dumped in low living area and are compacted by rolling with bulldozers Composting : Organic wastes are filled into a compost pit (2m × 1m× 1m). It is then covered with a thin layer of soil. After about three months the same garbage filled inside the pit changes into organic manure. 4. Recycling : The solid wastes is broken down into its constituent simpler materials. These materials are then used to make new items. Even non-bio degradable solid wastes like plastic, metal can be recycled. 5 Reuse : A very simple conventional technique of using an item again& again. For e.g. paper can be reused for making envelops etc. What you have learnt The various components of an ecosystem are interdependent.The producers make the energy from sunlight available to the rest of the ecosystem.There is a loss of energy as we go from one trophic level to the next, this limits the number of trophic levels in a food-chain.Human activities have an impact on the environment.The use of chemicals like CFCs has endangered the ozone layer. Since the ozone layer protects against the ultraviolet radiation from the Sun, this could damage the environment.The waste we generate may be biodegradable or non-biodegradable.The disposal of the waste we generate is causing serious environmental problems.

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Give detail about the different kind of waterways in India.

Posted by Kanika .... 5 years, 6 months ago

CBSE > Class 10 > Social Science

2 answers

Kanika .... 5 years, 6 months ago

Thanks

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Yogita Ingle 5 years, 6 months ago

Water transport can be divided into two categories-

a) Inland waterways and

b) Oceanic waterways.

Inland waterways include rivers, canals, backwaters and creeks which are deep enough to allow the ships and boats to navigate safely. India has about 14,500 km of navigable waterways out of which about 3700 km of river and 4300 km of canals are navigable by mechanised flat bottom vessels. Indian Waterways Authority of India (IWAI) is the statutory authority in charge of the waterways in India. It does the function of building the necessary infrastructure in these waterways, surveying the economic feasibility of new projects and also administration and regulation.

India has a long coastline of 7,517 km forming one of the biggest peninsulas in the world. It has 12 Major ports and 187 notified Minor and Intermediate ports. Oceanic waterways constitute an important role in the transport sector of India's economy. Ocean routes handle 95 percent of India's foreign trade by volume and about 70 percent by value. Besides international trade, these routes are also used for transportation between the islands and the rest of the country.

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Sir /mam please give test

Posted by Dalbir Singh 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Śěřãj The Cute? 5 years, 6 months ago

There has no sir and mam

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Notes for human eye

Posted by Spider Man 5 years, 6 months ago

CBSE > Class 10 > Science

4 answers

Spider Man 5 years, 6 months ago

Thank to all

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Yogita Ingle 5 years, 6 months ago

1. The Human Eye It is a natural optical instrument which is used to see the objects by human beings. It is like a camera which has lens and screen system.

(i) Retina : It is a light sensitive screen inside the eye on which image is formed. It contains rods and cones.

(ii) Cornea : It is a thin membrane which covers the eye ball. It acts like a lens which refracts the light entering the eye.

(iii) Aqueous humour : It is fluid which fills the space between cornea and eye lens.

(iv) Eye lens : It is a Convex lens made of transparent and flexible jelly like material. Its curvature can be adjusted with the help of ciliary muscles.

(v) Pupil : It is a hole in the middle of iris through which light enters the eye. It appears black because light falling on it goes into the eye and does not come back.

(vi) Ciliary muscles : These are the muscles which are attached to eye lens and can modify the shape of eye lens which leads to the variation in focal lengths.

(vii) Iris : It controls the amount of light entering the eye by changing the size of pupil.

(viii) Optical nerve : These are the nerves which take the image to the brain in the form of electrical signals.

2. Accomodation power : The ability of eye to change the focal length of eye lens with the help of ciliary muscles to get the clear view of nearby objects (about 25 cm) and far distant objects (at infinity).

3. Colour blindness : Some people do not possess some cone cells that respond to certain specific colours due to genetic disorder.

4. Myopia (Short sightedness) : It is a kind of defect in human eye due to which a person can see near objects clearly but he can not see the distant objects clearly. Myopia is due to

(i) excessive curvature of cornea.
(ii) elongation of eye ball.

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Maahi ......♾ 5 years, 6 months ago

Either, if you want so it is given in this app

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Maahi ......♾ 5 years, 6 months ago

May be this chapter is removed from the syllabus

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2 plane mirrors placed are at right angles to each other. A man stands between them and combs his hair with his right hand. In how many images will he seen using his left hand? a)0 b)1 c)2 d)3

Posted by Aakash Ramakrishnan 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Sachin Ray 5 years, 6 months ago

Contact me on watsapp I will explain you clearly

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Kanika .... 5 years, 6 months ago

The 2 plane mirrors are held at right angles, that is, they are inclined at an angle of 90 degrees. As we know that if 360/ 90 = 4 is a even no , the no of images is (360/90-1) = 3. In first two images the comb will be in his left hand, the image which is between those two images has the comb in his right hand. Hence, the answer is 1.

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I want to download computer application CBSE class 10th book

Posted by Abhay Majhi 5 years, 6 months ago

CBSE > Class 10 > Computer Applications (165)

0 answers

ANSWER

Define platelets.

Posted by Maahi ......♾ 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 6 months ago

Platelets are a type of blood cells present in our blood.
Platelets contain fibrinogen protein which help in clotting of blood during a cut or injury.

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Kajal Singh 5 years, 6 months ago

A tiny, disc-shaped piece of cell that is found in the blood and spleenThey help form blood clots to slow or stop bleeding and to help wounds heal.

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What lesson does Ebright learn when he does not win anything at a science fair

Posted by Dhyey Sonani 5 years, 6 months ago

CBSE > Class 10 > English Language and Literature

1 answers

Anas Siddiqui 5 years, 6 months ago

He learned that to be the best performer in science quiz,he should have to do some real experiments to prove his point and general theory related to it.

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Who have completed whole science book???

Posted by Anshuman Omm 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Riya Philip 5 years, 6 months ago

Last year students..........LOL

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ANSWER

What lesson does Enright learn when he does not win anything at a science fair

Posted by Dhyey Sonani 5 years, 6 months ago

CBSE > Class 10 > English Language and Literature

1 answers

Yogita Ingle 5 years, 6 months ago

When Richard Ebright did not win anything at the science fair, he realized that the winners had tried to conduct real experiments. He, on the other hand, had simply made a neat display. He had shown slides of frog tissues under a microscope. It was the first time that he got a hint of what real science was. This event served to develop the competitive spirit in him. Ultimately, it was this spirit of enthusiasm and competitiveness that drove him to achieve new heights in science.

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For this year which topics are there on carbon and it's compounds?

Posted by Asmita Belapurkar 5 years, 6 months ago

CBSE > Class 10 > Science