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Vaise toh 20 tk yaane ne ki calcium tk agr uske baad aate h exam h toh m dete h at. number element ka pr lekin 20 tk toh achi tarah yaad hone chahiye Well done if u have learnt till 30 at last it will help u only

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Khushi Chowdhary 4 years, 11 months ago

Yes,it is enough for class 10th

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Kritika Rajpal 4 years, 11 months ago

Yess

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Secret ??? 4 years, 11 months ago

Yes atomic no Upto 30 is enough fot 10th

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ANSWER

Why metals are good conductors of heat and electricity? Please answer I am really stuck to this question ?

Posted by Aman Kumar 4 years, 11 months ago

CBSE > Class 10 > Science

5 answers

Kiran Kumari 4 years, 11 months ago

Because metal have free electron and the non metal do not have free electron.

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Secret ??? 4 years, 11 months ago

???

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Aman Kumar 4 years, 11 months ago

Thanks you all for the answers??

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Secret ??? 4 years, 11 months ago

Metals contain valence electrons and these electrons are free to move from one place to another. ... Thus, metals are good conductors of heat and electricity because there are free moving atoms in metals that carry both heat and electric current.

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Bawwa G 4 years, 11 months ago

Metal having free electron. When one end of metal wire is heated, these free electron start moving to another end of metal thus conducting heat. Same for electricity , when potential differences (PD) is applied accrues end of a metallic conductor ,they start moving from negative end to positive end of the conductor giving rise to flow of current which is from positive to negative end. Because of that metal is good conductor of heat and electricity.

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Can insulators and semi conductors produce magnetic field..or is it only conductors produce magnetic field??

Posted by Saba Urooj 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Secret ??? 4 years, 11 months ago

I think insulators do not have magnetic field as they don't conduct electricity. I am not sure about semi conductors

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ANSWER

If a conducting wire acts like a magnet, what does it attract??

Posted by Saba Urooj 4 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Rahul Kuntal 4 years, 11 months ago

It become a electromagnet. It will attract iron,nickel,cobalt or iron like substance as it act as magnet. ?

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Secret ??? 4 years, 11 months ago

It will attract ferromagnetic substances like iron, cobalt, nickel. Soft iron can easily be magnetised and demagnetised. Soft iron is widely used for making electromagnets. Soft iron:iron that has a low carbon content and is easily magnetized and demagnetized, used to make the cores of solenoids and other electrical equipment.

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Saba Urooj 4 years, 11 months ago

Is it only soft iron??

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Secret ??? 4 years, 11 months ago

Conducting wire do act like magnet. They are electromagnet. It attracts soft iron

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ANSWER

Give the most important characteristics feature of the organism which reproduce by fragmentation

Posted by Ayush Sarda 4 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Rahul Kuntal 4 years, 11 months ago

In fragmentation,organisms get farmented into many small piece which later on developed in whole individual.

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Secret ??? 4 years, 11 months ago

#This feature itself is an advantage for the organism as any body part can develop into complete organism. # in comparison to other mode of reproduction it is simple and convenient. # The offsprings produced are the exact copies of their parents. # The chances of variation are very low.

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Difference between the functions of cerebrum and cerebellum.

Posted by Sanket Sundar 4 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Secret ??? 4 years, 11 months ago

Nope

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Shubham Chaudhary 4 years, 11 months ago

Ye ch boards m aa rha h kya

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Secret ??? 4 years, 11 months ago

#Cerebrum: is the largest part of the brain and is composed of right and left hemispheres. It performs higher functions like interpreting touch, vision and hearing, as well as speech, reasoning, emotions, learning, and fine control of movement.# Cerebellum: is located under the cerebrum. It controls The cerebellum receives information from the sensory systems, the spinal cord, and other parts of the brain and then regulates motor movements. It coordinates voluntary movements such as posture, balance, coordination, and speech, resulting in smooth and balanced muscular activity.

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modern periodic table was given by Henry Moseley but he was only tell but physically prepared by neals boar's what i m correct information getting

Posted by Komal Jaiswal 4 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Aman Kumar 4 years, 11 months ago

Henry Moseley only suggested that the atomic number of elements should be the basic property to arrange elements in the modern periodic table

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Secret ??? 4 years, 11 months ago

Pura question

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Secret ??? 4 years, 11 months ago

यदि आपको English में लिखने में problem है तो आप हिंदी का भी use कर सकते हैं लेकिन question लिखें.

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How is concentration of hydronium ions (H3O+) affected when a solution of acid is diluted? Please explain

Posted by Chanchal Verma 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Palak Sharma 4 years, 11 months ago

It result in descrease in the concentration of ions (H3O)

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What is specific resistance??

Posted by Reema Janu 4 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Kiran Kumari 4 years, 11 months ago

Reciprocal of conductivity is called resistivity. Resistivity is also known as specific resistance.

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Secret ??? 4 years, 11 months ago

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Reema Janu 4 years, 11 months ago

Thank you for your answer

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Tanu Choudhary # 4 years, 11 months ago

Specific resistance is a property of a conductor to oppose current. It depends upon nature of material of conductor and temperature of conductor. Cu and Al are considered best to make wires used in various circuits because their specific resistance is very low.

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If we are told that hetero trophic nutrition is that in which oragnanisms depends on others then why grass is autrophic as it also obtain their food from sunlight and also with a help of decomposers who occurs on dead and decaying matter and convert them into nutrients for plants...

Posted by Vanshika Panwar 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Tanu Choudhary # 4 years, 11 months ago

In hetrotrophic nutrition, an organism depends upon other organisms for food directly but green plants like grass indirectly depends upon other organisms like decomposers. In autotrophic nutrition organism only gets some essential minerals like nitrogen, phosphorus etc and they get sunlight from sun which is inorganic. And they make food by combining all these on their own So we are told so.

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Write one observation when Magnesium ribbon is burnt in air

Posted by Sumit Kumar 4 years, 11 months ago

CBSE > Class 10 > Science

5 answers

Harchitha Narayanan 4 years, 11 months ago

2Mg + O2 = 2MgO

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Secret ??? 4 years, 11 months ago

He is asking for observation. When mg ribbon burns in air White dazzling flame come out of it and a white powdery substance will be formed.

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Reema Janu 4 years, 11 months ago

When the magnesium ribbon is burnt in air it forms a white powder called magnesium oxide. It is obtained by the reaction of oxygen and magnesium. 2Mg + O2 = 2MgO

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Vanshika Panwar 4 years, 11 months ago

Magnesium ribbon is burnt in air which is oxygen with a white dazzling flame... Then after occurring with oxygen it convert into magnesium oxide which is a white powdery substance.... Mg2 + O2 = 2MgO

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Gaurav Seth 4 years, 11 months ago

When magnesium ribbon is burnt in air, it combines with oxygen to form white powder magnesium oxide MgO with the release of heat and light. It forms a white powder of the magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product.

2Mg+O2⟶2MgO

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ANSWER

Om Pandey tum chahe khi ke bhi topper ho pr aise kisi Ka no. Ni Magna chahiye or tum mobile no. leke kya Kroger?? ?

Posted by Pihu ✨ 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 4 years, 11 months ago

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Give general properties of salt

Posted by Ved Rawat 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 4 years, 11 months ago

Properties:

Salts are mostly solids which melt as well as boil at high temperatures.
Salts are generally soluble in water. For example, sodium chloride, potassium sulphate, aluminium nitrate, ammonium carbonate, etc., are soluble salts while silver chloride, lead chloride, copper carbonate, etc., are insoluble in water.
It is a white crystalline solid. It exists as decahydrate of sodium carbonate.
When exposed to dry air and heating it loses water molecules to change into anhydrous form.
Na₂CO₃.10H₂O + Exposure to open dry air → Na₂CO₃.H₂O + 9H₂O
Na₂CO₃.H₂O + Heating → Na₂CO₃
It is soluble in water and during dilution heat will releases out.
On reaction with acids sodium carbonate releases carbon dioxide along with the formation of sodium salts and water. Na₂CO₃ + HCl → 2NaCl + H₂O + CO₂
Sodium carbonate is used to manufacture of glass, cleansing agents, soap, glass and paper.

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Define vaccum

Posted by Md Janu Ansari 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 4 years, 11 months ago

Vacuum, space in which there is no matter or in which the pressure is so low that any particles in the space do not affect any processes being carried on there. It is a condition well below normal atmospheric pressure and is measured in units of pressure (the pascal).

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@Class_10_board join it

Posted by Abhay Singh 4 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Abhay Singh 4 years, 11 months ago

Kunal @class_10_board search karo Google ya chrome pe aa jayega ye telegram group hai

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Abhay Singh 4 years, 11 months ago

Here a lot of study materials are Available for board preparation . So , students who are studying for 10th kindly join it

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How can our lungs continuously supply clean atmospheric air?

Posted by Shubham Chaudhary 4 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Gaurav Seth 4 years, 11 months ago

Lungs are located in the chest cavity and separated from stomach and other parts of digestive system by a diaphragm. During breathing, intercostal muscles of ribs contract and relax which causes change in the volume of thorax.

During inhalation rib cage is raised and diaphragm lowers as intercostal muscles contract while during exhalation rib cage is lowered, diaphragm moves up, as intercostal muscles relax.

To ensure that clean atmospheric air is taken in during inhalation, there are hairs in nose which filter the air, trapping dirt in the mucus secreted from the epithelial lining.

In addition, epithelium in trachea also consists of ciliated cells. Cilia continuously beat upward to sweep the mucus from throat to the pharynx. Special goblet cells secrete mucus to trap the dirt from the inhaled air.

Cilia sweep it upward and it is swallowed from the pharynx into the adjacent oesophagus. Hence, the air entering lungs is free from dirt particles.

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Saranya Sahoo 4 years, 11 months ago

Revise ur question

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Om, I don't want to know who you are. And for your kind information let me told you that I always score above 90% in every academic session. There is no relation between this and your marks so do stop this. And if you want to contact me or any other student just drop a msg here but not extra messages. ?

Posted by Secret ??? 4 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Abhay Singh 4 years, 11 months ago

Where is question

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Secret ??? 4 years, 11 months ago

???

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Secret ??? 4 years, 11 months ago

???

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Reema Janu 4 years, 11 months ago

Nope

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What is fertilization explain tha types of fertilization

Posted by Vaishnavi Gupta 4 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Vanshika Panwar 4 years, 11 months ago

Fertilisation is a process in which a male cell ( sperm) and a female cell ( ova) fuses to form zygote... Its of mainly 2 types : internal fertilisation in which the fertilisation takes place inside the female body and external fertlization in which the fertlization takes place outside the female body

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Secret ??? 4 years, 11 months ago

Fertilisation is the fusion of male and female gamates either inside or outside female's body. There is two type of fertilisation:- 1) Internal fertilisation: when fertilisation occurs inside female's body it is called internal fertilisation. Eg, humans, birds etc. 2) External Fertilisation: When fertilisation occurs outside female's body it is called External fertilisation. Eg, frog

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Define the structure of male gamate or sperm with figure

Posted by Vaishnavi Gupta 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Secret ??? 4 years, 11 months ago

Sperm mainly has 2 parts, Head with nucleus and cytoplasm And a tail which helps it to swim in semen and reach to egg. We can't insert pictures here so sorry for diagram

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Define the germination of seeds with figure

Posted by Vaishnavi Gupta 4 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Secret ??? 4 years, 11 months ago

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Diwakar Mishra 4 years, 11 months ago

Good

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Secret ??? 4 years, 11 months ago

Germination is a process by which an organism rises from seed or similar structure. In suitable contions tiny outlet comes out from plumule called seedling.

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Define the formation of fruits and seeds

Posted by Vaishnavi Gupta 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Secret ??? 4 years, 11 months ago

Pollen grains fall on stigma of flowers and it forms pollen tube which runs along with style after chemotropism. Nucleus of pollen grain divides itself into 2 haploid male gamate. One fuses with the egg cell and forms diploid cell and it develops into seed. Other gamate fuses with diploid polar nuclei and forms triploid cell which serves as food for zygote or seed. Ovary develops into fruit and gives protection and food.

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ANSWER

What is ampere swimming rule?

Posted by Tanishka Roy 4 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Secret ??? 4 years, 11 months ago

Ampere's swimming rule states that if a man swims along the current-carrying wire, suc that his face is always towards the magnetic needle through which the current is entering his feet and leaving from his head, then the north pole of the magnetic needle is always deflected towards his left hand.

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Match the column Column 'A' a) Process of deposition of gold or silver on ornaments b) Carbon rod c) Distilled water d) Vinegar Column 'B' Good Conductor i) ii) Electrode i) Poor conductor iv) Electro-plating.

Posted by Account Deleted 4 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Shubham Chaudhary 4 years, 11 months ago

One correction in my answer c-iii(poor conductor) and d-(good conductor)

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Kiran Kumari 4 years, 11 months ago

Process of deposition of gold or silver on ornament =electroplating Carbon rod=electrode Distilled water=poor conductor Vinegar =good conductor

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Secret ??? 4 years, 11 months ago

Vinegar releases h+ ions when electricity is passed from it i.e it is a good conductor of electricity. And distilled water i.e pure water is poor conductor because it did not releases any ions when electricity is passed

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Shubham Chaudhary 4 years, 11 months ago

a-iv b- ii c- i d- iii

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A non metal A is an important constituent of our food and form two oxides B and C. Oxide B is toxic and oxide C causes global warming. I. Identify A, B and C 2. To which group does A belong to?

Posted by Aziz Fatima 4 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Kiran Kumari 4 years, 11 months ago

A belong to group 14.

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Kiran Kumari 4 years, 11 months ago

A=carbon B=carbon monoxide C=carbon dioxide

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Shubham Chaudhary 4 years, 11 months ago

A- carbon B- carbon monoxide C- carbon dioxide A belongs to group 14

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Tanuj Kumar 4 years, 11 months ago

0000

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ANSWER

Om Pandey either stop asking for phone numbers or logout from the app. I or any other student will not give their phone no or other information to anyone and Plz don't share your also.

Posted by Secret ??? 4 years, 11 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Want is lipase and what is it's function

Posted by # Anushka Negi 4 years, 11 months ago

CBSE > Class 10 > Science

3 answers

# Anushka Negi 4 years, 11 months ago

Ara duffer

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# Anushka Negi 4 years, 11 months ago

Thanks

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Secret ??? 4 years, 11 months ago

Lipase is an enzyme that body uses to break down fats in food so they can be absorbed in the intestines.

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What is villi and what is it's function

Posted by # Anushka Negi 4 years, 11 months ago

CBSE > Class 10 > Science

5 answers

Vanshika Panwar 4 years, 11 months ago

Villi are the long finger like projections present inside the small intestine... These helps intestine to increase their surface area so that absorption of food is done rapidly.

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Kiran Kumari 4 years, 11 months ago

Fingers like projections present in the inner lining of small instestine is called villi. It increases the surface area for the absorption of food.

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Reema Janu 4 years, 11 months ago

The finger like projection present in the inner lining of the small intestine is called villi. It makes the surface area for the absorption of food. It also rich in blood capillaries and carried the absorbed food to the whole body

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Vansh Gupta 4 years, 11 months ago

Good

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Secret ??? 4 years, 11 months ago

Villi are finger like projections present in inner lining of small intestine. They have one cell thick cell wall to facilate absorbtion of food or say nutrients and blood capillaries in them so that absorbed nutrients can enter into blood and can be supplied to whole body

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ANSWER

Intestinal glands walls of small intestine contain numerous glands that secrete intestinal juice containing 1 Amylolytic 2 Proteolytic 3 lipolytic Enzymes What is the role of these enzymes explain one by one

Posted by # Anushka Negi 4 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Misty Chan 4 years, 11 months ago

Itna shok Aara rha h hena no den ka toh kisi call centre pr jaake dedo apne no. Mr. Gupta

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# Anushka Negi 4 years, 11 months ago

I don't want your number

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# Anushka Negi 4 years, 11 months ago

Ara Mr Duffer

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How to find valancy of an element.

Posted by Abcd Xyz 4 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Vanshika Panwar 4 years, 11 months ago

We can find it very easily with the help of its electronic configuration... Lets suppose we are having a element namely calcium... Its atomic no. Is 20 and therefore, its electronic configuration is 2, 8, 8, 2... Now we have to see the no. Which is on the last shell of the electronic configuration, I.e, 2... So hence, our valency of calcium is 2

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Kiran Kumari 4 years, 11 months ago

If theNo.of valance electron present in the last shell is 1, 2,3 then the valency of elements is also equal to 1,2, $3. If the no. Of valence electron in the last shell is 5,6, $7then then the valency is=8_no.of valece electron.

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Secret ??? 4 years, 11 months ago

If the no of electrons present in the last shell is 1,2, 3 and 4 then the valency will be equal to no of electrons in the last shell. If the no of electron present in the last shell is 5,6,7 and 8 then to find valency we have to minus no of -e from 8

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