CBSE > Class 10 | CBSE Board | Homework Help

? ?????? ???? is that which is thicker at the middle as compared to the edges. A convex lens converges light rays and hence is also called a converging lens. ? ??????? ???? is that which is thicker at the edges as compared to the middle. A concave lens diverges light rays and hence is also called a diverging lens.

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Amrita Yadav 4 years, 3 months ago

Convex lens - thicken at middle , Converging . Concave lens- thicken at the end , Diverging .

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What is the speed of light in air?

Posted by Sweta Kumari 4 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Sweta Kumari 4 years, 2 months ago

3 × 10^8 m/s square

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Akash Verma 4 years, 3 months ago

299,792,458 meters per second to 299,702,547 meters per

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Iodine:berium:radium find

Posted by Rashid Khan 4 years, 3 months ago

CBSE > Class 10 > विज्ञान

0 answers

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Why education is important what should be done to make education accessible to every person in India

Posted by Vansh Gharu 4 years, 3 months ago

CBSE > Class 10 > Social Science

1 answers

Sia ? 4 years, 3 months ago

Education helps us to lead a good and healthy life. Education helps us to know uses of various types of food and how to consume them. It also educates us about how to protect ourselves from diseases and stay away from bad habits.

Education is very important for every country. Education begins at home and continues throughout our life. There are many reasons why people need education. It helps them to learn new things, find good jobs and lead a respectable life in the society.

So, the higher the level of education in a country, the better the chances of development are. In addition, this education also benefits an individual in various ways. It helps a person take a better and informed decision with the use of their knowledge. This increases the success rate of a person in life.

People need a good education to be able to survive in this competitive world. Modern society is based on people who have high living standards and knowledge which allows them to implement better solutions to their problems. Education empowers everyone.

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What plans had dr.herriot made for tricki in advance and why

Posted by Himanshu Sharma 4 years, 3 months ago

CBSE > Class 10 > English Language and Literature

0 answers

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राजसिहः कूत्र वसति सम?

Posted by Akash Student 4 years, 3 months ago

CBSE > Class 10 > संस्कृत (शेमुषी)

2 answers

Piyush Kushwah 4 years, 2 months ago

Hii

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Ananya Ananya 4 years, 2 months ago

देउलाख्यो ग्रामः/देउलाख्यः

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What is webserver

Posted by Mitesh Ram 4 years, 3 months ago

CBSE > Class 10 > Computer Applications (165)

1 answers

Sia ? 4 years, 3 months ago

A web server is computer software and underlying hardware that accepts requests via HTTP, the network protocol created to distribute web pages, or its secure variant HTTPS.

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Briefly explain the scope origin nature of scoiology

Posted by Meenakshi Khatri 4 years, 3 months ago

CBSE > Class 10 > Social Science

1 answers

Sia ? 4 years, 3 months ago

Sociology is a discipline in social sciences concerned with the human society and human social activities. It is one of the youngest social sciences. Auguste Comte, a French social thinker, is traditionally known as the ‘Father of Sociology’ as he coined the term ‘Sociology’ in 1839.

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Write the interdependenct relationship between nature, technology and institution ?

Posted by Jkj Jj 4 years, 3 months ago

CBSE > Class 10 > Social Science

1 answers

Sia ? 4 years, 3 months ago

Nature contains resources. These resources are converted into usable form with the help of technology. Human beings interact with nature through technology and create institutions to accelerate their economic development.

1) Nature is defined by the rainfall, climate, topographic features of the place and does not depend on man-made or developed resources.
2) Technology is developed with the nature and natural resources of the place, technology is developed for man's facilitation.
3) Institutions develop technologies based on resources. These technologies are used to utilize better resources which expand the institutions, and in return those institutions develop better technologies for better utilization of resources.

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Distinguish between renewable and non-renewable resources

Posted by Jkj Jj 4 years, 3 months ago

CBSE > Class 10 > Social Science

2 answers

Nitya Pv 4 years, 3 months ago

The resources which can be renewed is called as renewable resources For example solar and wind energy ,water, forest,wildlife etc The resources which take millions of years in their formation Is called as non renewable resources For example Fossil fuels Hope it helps ?

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Mishti Roy 4 years, 3 months ago

The resources which can be renewed or reproduce by physical chemical or mechanical process known as renewable or replensihable resource. Eg: solar energy Non renewable resource occur over a very long geological time. Mineral and fossil fuel are eg of these resources. Some like metals are recyclable and some like fossil fuel can't be recycle and get exhausted with their use.

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Suggest some measures to prevent soil erosion in hilly areas, mountainous and desert areas.

Posted by Jkj Jj 4 years, 3 months ago

CBSE > Class 10 > Social Science

2 answers

Sia ? 4 years, 3 months ago

1) Ploughing across elevation contour lines. The contour lines break water run offs during heavy rainfall, impeding soil erosion.
2) Practicing terrace farming: This is where graduated steps of land are made on the slope to control soil erosion.
3) Planting strips of grass: Grass on the slopes acts as water and wind breaker, therefore limiting the process of erosion.

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Nitya Pv 4 years, 3 months ago

Steps to prevent soil erosion Terrace farming Countour ploughing Countour farming Strip cropping Shelter belts Intercropping Rock dam Multchines Hope it helps ?

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What is soil erosion? Mention the reasons for soil erosion.

Posted by Jkj Jj 4 years, 3 months ago

CBSE > Class 10 > Social Science

1 answers

Sia ? 4 years, 3 months ago

the soil particles are loosened or washed away in the valleys, oceans, rivers, streams or far away lands. This has been worsening due to human activities such as agriculture and deforestation.

It is the natural process of wearing away of the topsoil, but human activities have accelerated the process.
It is usually caused due to the removal of vegetation, or any activity that renders the ground dry.
Farming, grazing, mining, construction and recreational activities are some of the causes of soil erosion.
The effects of soil erosion are not just land degradation. It has led to a drastic increase in pollution and sedimentation in rivers that clogs the water bodies resulting in a decline in the population of aquatic organisms.
Degraded lands lose the water holding capacity resulting in floods.

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What is precipetate reaction

Posted by Shikhar Chauhan 4 years, 3 months ago

CBSE > Class 10 > Science

5 answers

Anmol Preet 4 years, 3 months ago

In precipitation reactions, aqueous solutions of two salts are mixed together whereby some salt precipitates due to mutual exchange of ions between the two salts.

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Om Tiwari 4 years, 3 months ago

Precipitation is process that involves in double displcement reaction.

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Aditya Anand 4 years, 3 months ago

Precipitation reaction is a type of double displacement reaction in which a substance is insoluble in water (solid ) known as precipitate

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Muskan Kumari 4 years, 3 months ago

Precipitation reaction is a type of double displacement reaction in which a substance is insoluble in water (solid ) known as precipitate.

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Sahil Srivastava 4 years, 3 months ago

Precipitation reaction is nothing but the reaction in which precipitate form in bottom of the beaker

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What did lencho do the destruction of the crop?

Posted by Saloni Harinkhede 4 years, 3 months ago

CBSE > Class 10 > English Language and Literature

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Use Euclids division algorithm,find HCF of 1266 and 7344

Posted by Manovyas Reddy 4 years, 3 months ago

CBSE > Class 10 > Mathematics

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1.What is the drift speed of electrons through a conductor carrying current? 1. What is the speed of a current through a conductor?

Posted by Vandana Khare 4 years, 3 months ago

CBSE > Class 10 > Science

2 answers

Aditya Anand 4 years, 3 months ago

No, drift speed of electrons is around 10-4m/s, whereas speed ofcurrent is nearly equal to the speedof light in vacuum

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Prarthana Dehariya 4 years, 3 months ago

No, drift speed of electrons is around 10-4m/s, whereas speed ofcurrent is nearly equal to the speedof light in vacuum

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Share of primary sector in gdp and employment during 1973-74, 1977-78, 2013-14, 2017-18

Posted by Account Deleted 4 years, 3 months ago

CBSE > Class 10 > Social Science

1 answers

Vijay Sagar 2 years, 1 month ago

share in gdp

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What is Manrega And explain its features

Posted by Sneha Singh 4 years, 3 months ago

CBSE > Class 10 > Social Science

2 answers

Sia ? 4 years, 3 months ago

It aims to enhance livelihood security in rural areas by providing at least 100 days of wage employment in a financial year to every household whose adult members volunteer to do unskilled manual work.

(1) The MGNREGA is a employment generation scheme of the government of India for rural areas.
(2) This Act was passed in September 2005.
(3) The Central Government will establish funds for this scheme.
(4) State Governments will also establish state level funds for implementation of the scheme.
(5) It provides 100 days of wage employment every year to every rural household.
(6) One - third of the proposed jobs have been reserved for women.
(7) If an applicant is not provided employment within fifteen days, he or she will be entitled to unemployment allowance.

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Soham Chikorde 4 years, 3 months ago

National Rural Employment Guarantee Act 2005 (or, NREGA No 42, later renamed as the “Mahatma Gandhi National Rural Employment Guarantee Act”, MGNREGA), is an Indian labour law and social security measure that aims to guarantee the ‘right to work’. It aims to enhance livelihood security in rural areas by providing at least 100 days of wage employment in a financial year to every household whose adult members volunteer to do unskilled manual work. (1) The MGNREGA is a employment generation scheme of the government of India for rural areas. (2) This Act was passed in September 2005. (3) The Central Government will establish funds for this scheme. (4) State Governments will also establish state level funds for implementation of the scheme. (5) It provides 100 days of wage employment every year to every rural household. (6) One - third of the proposed jobs have been reserved for women. (7) If an applicant is not provided employment within fifteen days, he or she will be entitled to unemployment allowance.

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What is MNREGA ? Explain it's main features

Posted by Aditi Rana 4 years, 3 months ago

CBSE > Class 10 > Social Science

2 answers

Aditi Rana 4 years, 1 month ago

Hii

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Aditi?? Sharma 4 years, 3 months ago

Hii

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How to do analytical paragraph

Posted by Kavita Srivastava 4 years, 3 months ago

CBSE > Class 10 > English Language and Literature

0 answers

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How washing soda is produced ? By step by step equation. And also explain it

Posted by Sweta Kumari 4 years, 3 months ago

CBSE > Class 10 > Science

1 answers

Anmol Preet 4 years, 3 months ago

???? 1 :- Limestone is heated to furnish carbon - dioxide and lime. CaCO3 (s) (by heat) ----> CaO (s) + CO2 (g). ???? 2 :- Carbon dioxide and ammonia gases are bubbled into a saturated solution of sodium chloride (NaCl) at 15°C. NaCl + NH3 + CO2 + H2O ---> NaHCO3 + NH4Cl Sodium Hydrocarbonate (NaHCO3) is sparingly soluble in water at 15°C and is filtered out. ???? 3 :- On heating, NaHCO3 gives sodium carbonate (Na2CO3). 2NaHCO3 (s) (by heat) ---> Na2CO3 (s) + CO2 (g) + H2O (g) Anhydrous sodium carbonate (Na2CO3) thus obtained is called soda ash. Sodium carbonate readily dissolves in water. The solution on evaporation below 32°C gives crystals of sodium carbonate, Decahydrate, i.e., Na2CO3.10H2O.

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How many water molecules present in gypsum ?

Posted by Sweta Kumari 4 years, 3 months ago

CBSE > Class 10 > Science