CBSE > Class 10 > Science | CBSE Board | Homework Help

a signal transmitted along a nerve fibre. It consists of a wave of electrical depolarization that reverses the potential difference across the nerve cell membranes.

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Ashutosh Bharti 5 years, 11 months ago

Transfer of information into the brain in form of electrical signals

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ANSWER

Define aqua-regia and its uses with chemical name and its reaction

Posted by Rajni Sirola 5 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Faisal Shaikh 5 years, 11 months ago

It is freshly prepared mixture of 1part of concentrated nitric acid and 3 part concentrated hydrochloric acid This is able to dissolve free elements exist in in nature such as gold and platinum

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☺ ............. 5 years, 11 months ago

Aqua regia is the mixture of conentrated hydrochloric acid and nitric acid ??

1Thank You

Jyoti Singh 5 years, 11 months ago

Aqua-regia is the mixture of concentrated hydrochloric acid and nitric acid in 3:1. It is the only solution in which gold and platinum get dissolved. It is a corrosive reagent which is used for Cleaning glassware and refining gold

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Diksha? 5 years, 11 months ago

Aqua regia is a mixture of concentrated hydrochloric acid and nitric acid

3Thank You

ANSWER

Difference between inherited and acquired traits ( any 5 ) ?

Posted by Jasmandeep Kaur 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Jyoti Singh 5 years, 11 months ago

Inherited traits are those traits which we get from our parents and acquired traits are those traits that are not inherited by the parents

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ANSWER

Name the reaction used to convert saturated hydrocarbon into unsaturated hydrocarbon Name the catalyst used in the above conversation reaction

Posted by Akash Pandey 5 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Shbham@ Dhakad 5 years, 11 months ago

? ? 1

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Vaishnavi Gawade 5 years, 11 months ago

Addition or hydrogenation reaction . Nickel and palladium are used as catalysts

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Golly L 5 years, 11 months ago

Cbse sample paper 2020

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ANSWER

Give one advantage of having a large number of highly coiled structures in our kidney

Posted by Vaishnavi Gawade 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

?Sᴀʀᴋᴀʀ? ▄︻┻┳═一 ? Ꭰꭿꭰꭰꮍ ? 5 years, 11 months ago

They absorb waste material and clear dirt which passes through it then they transfer this dirt to urinary bladder for excretion

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ANSWER

Explain the process of aerobic respiration in mitochondria of a cell and anaerobic respiration in yeast and muscle with the help of word equation

Posted by Archana Jeengar 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 11 months ago

1] absence of oxygen->[in yeast] ->ethanol + carbon dioxide +energy.

2]presence of oxygen->[in mitochondria] ->carbon dioxide+water +energy

The equation for alcoholic fermentation is as follows;

Some examples of anaerobic respiration include alcohol fermentation, lactic acid fermentation and in decomposition of organic matter. The equation is: glucose + enzymes = carbon dioxide + ethanol / lactic acid.

Word equation is: Glucose + Oxygen = Carbon dioxide + Water + Energy.

Chemical equation: C₆H₁₂O₆+ 6O₂= 6CO₂ + 6H₂O +2900 kJ/mole.

It's in the Equation

C₆H₁₂O₆ = 2C₂H₅OH + 2CO₂ + 2ATP. Anaerobic respiration is the ability of an organism to produce energy in the form of Adenosine Triphosphate (ATP) without using oxygen. Instead, sulfate, nitrate or sulfur is used.

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ANSWER

Why food web is more significant than food chain

Posted by Simerjeet Kaur 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Mohan Shukla 5 years, 11 months ago

Food chain is the sequence of different organism through which energy in the form of food transmitted in different tropic levels. While in food Web each organism is eaten by two or more kind of organism which in turn are eaten by several other organism.

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ANSWER

KOH+H2SO4------->

Posted by Piyush Kumar 5 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Broken Buddy 5 years, 11 months ago

2KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2H2O(l)

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Diksha? 5 years, 11 months ago

K2SO4 + H2O

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Broken Buddy 5 years, 11 months ago

KOH is a strong base and H2SO4 is a strong acid, Hence they will neutralize each other

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ANSWER

Why there is need for reproducing an organisms?

Posted by Om Patel 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Paul Richard 5 years, 11 months ago

It is done to continue our species/generation

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ANSWER

Define a isomers

Posted by Muskan Taank 5 years, 11 months ago

CBSE > Class 10 > Science

11 answers

Faisal Shaikh 5 years, 11 months ago

1 =The property of self combination of the atoms of same element is catenation 2=The compound having same molecular formula but different structures is isomer

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Diksha? 5 years, 11 months ago

Tum kyu sorry bol rhe ho?

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Broken Buddy 5 years, 11 months ago

Ohk sorry

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Diksha? 5 years, 11 months ago

Yah self linking property is called catenation.

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Diksha? 5 years, 11 months ago

I was saying how can isomers be self linking property?

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Aseem Mahajan 5 years, 11 months ago

Self linking property isn't catenation?

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Diksha? 5 years, 11 months ago

Self linking property?

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Bablu Kumar Sharma 5 years, 11 months ago

Those compounds which have same molecular formulas but different structure

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Aseem Mahajan 5 years, 11 months ago

No, that is catenation

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Karan Kumar 5 years, 11 months ago

Self linkig property of carbon to form bond with other elements

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Aseem Mahajan 5 years, 11 months ago

Isome is s are chemical compounds with same formula but different molecular structure

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ANSWER

Which lens would you prefer to use while reading small letters from a dictionary

Posted by Tanishq Soni 5 years, 11 months ago

CBSE > Class 10 > Science

6 answers

Faisal Shaikh 5 years, 11 months ago

CONCAVE LENS because it is a diverging lens means word appears to be large

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Ajay ???? 5 years, 11 months ago

Convex

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Aseem Mahajan 5 years, 11 months ago

Convex lens because it acts as a magnifying glass

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Diksha? 5 years, 11 months ago

Convex lens

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Bhumika Jindal 5 years, 11 months ago

Concave lens

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Dr. Shreyas Samarth 5 years, 11 months ago

CONVEX lens.

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ANSWER

What is atom

Posted by Bittu Kumar 5 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Faisal Shaikh 5 years, 11 months ago

Which occupies space and have some mass

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Bablu Kumar Sharma 5 years, 11 months ago

An atom is the smallest particles of matter.

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Yogita Ingle 5 years, 11 months ago

Atom is a Greek word which means “indivisible.” The Greeks believed that matter can be broken down into very small invisible particles called atoms. Greek philosophers such as Democritus and John Dalton put forward the concept of the atom.

Democritus explained the nature of matter. He also proposed that all substances are made up of matter. He stated atoms are constantly moving, invisible, minuscule particles that are different in shape, size, temperature and cannot be destroyed.

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Amit Kumar Bind 5 years, 11 months ago

Smallest unit of particles is called atom

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ANSWER

Explanation of the chapter carbon and its compound

Posted by Subashni Nahakpham 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Bablu Kumar Sharma 5 years, 11 months ago

Solve your problem from vedantu

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?Roman ? 5 years, 11 months ago

<font size=20>???

4Thank You

ANSWER

What do you mean by ore

Posted by Nik . 5 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Bhumika Jindal 5 years, 11 months ago

The minerals from which we extract metal profitably and conveintly

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Yogita Ingle 5 years, 11 months ago

Most metals are too reactive to exist on their own in the ground. Instead, they exist combined with other elements as compounds called ores. Ores are raw materials for making metals.

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?Roman ? 5 years, 11 months ago

The minerals mixed with impure substances is known as Ore.

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ANSWER

What do you mean by roasting

Posted by Nik . 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 11 months ago

Roasting:
Conversion of metals into their oxides in presence of air is called roasting.
Sulphide ores are subjected to roasting process.
Ex: 2ZnS + 3O₂ → 2ZnO + 2SO₂

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Bablu Kumar Sharma 5 years, 11 months ago

The corrosion of iron is called rusting

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ANSWER

Analyse the following observation table solving variation of image distance (v) with object distance (u) in case of a convex lens and answer the questions that follows: S.No.4 object distance is -20 and image distance is +60 Take an appropriate scale to draw ray diagram for the observation at s.no.4 and find the approximate value of imagnification.

Posted by Sachin Chourasiya 5 years, 11 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What is power of lens ?and si unit also ?

Posted by Boss Is Always Right 5 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Bablu Kumar Sharma 5 years, 11 months ago

Power of lens is the reciprocal of the focal length. And its si unit is dioptre.

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Bhumika Jindal 5 years, 11 months ago

Reciprocal of focal length is known as power of lens . SI Unit is dioptre

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Shreya ... 5 years, 11 months ago

It is the ability to converge or diverge light rays. It is defined as the reciprocal of focal length. It's SI unit is Dioptre.

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ANSWER

Hey there what is difference between alkali and a base

Posted by Chitresh Khandal 5 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Yogita Ingle 5 years, 11 months ago

Base	Alkali
Bases do not dissolve in water	Bases that dissolve in water are alkali
All bases are not alkali	All alkali are bases
It neutralizes acids	It releases OH- ions, accepts a proton
Example: Zinc hydroxide, copper oxide	Example: potassium hydroxide, sodium hydroxide

1Thank You

?Roman ? 5 years, 11 months ago

<font size=6>Yep

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Dr. Shreyas Samarth 5 years, 11 months ago

All alkali r bases but all bases r not alkali.....alkali dissolves in water....but all bases can't......this is the main difference.

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ANSWER

For distant vision: power of lens, p=_5.5d

Posted by Ritik Kasana 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Riya Rathore 5 years, 11 months ago

25 cm

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ANSWER

Trigonometry

Posted by A.T.S Sirsiya Shrawasti Reading Group 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Bhumika Jindal 5 years, 11 months ago

12mai aao pehle science mai trigonometry padhne ke liye

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Tanya Singh 5 years, 11 months ago

Trigonometry math me hoti hai

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ANSWER

What are the disadvantages of tissue culture?

Posted by Dhoodhu Pc 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 11 months ago

Tissue culture is a practice of propagating organisms under sterile conditions, often to produce clones of a organism. Here, new organisms are grown by removing a tissue or separating cells from the growing tip of an organism. It can be plant tissue culture or animal tissue culture

Disadvantages

1. It is labor intensive and expensive process.
2. It may be vulnerable to many environmental factors since they have same genetic material.

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Chitresh Khandal 5 years, 11 months ago

It does not allow plant to grow in a normal enviormental condition through which plant finds it difficult to adopt the new condition Expnesive this process

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ANSWER

Two identical Rods are given one is magnet and one is iron without using any other substance how will you find

Posted by Sundaram Kumar 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Sundaram Kumar 5 years, 4 months ago

In question it is specically given that without using any substance

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Bhavna Chatija 5 years, 4 months ago

By bringing ni, co and fe particles near to the two given rod If these particles attract then it is a magnet rod otherwise it is a iron rod

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ANSWER

Metal sulphides mostly found in rock but metal halide found in sea and Lake water. Give reason for this observation

Posted by Pranav . 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Ankit Kumar 5 years, 11 months ago

Metal halides are the salt which have tendency to dissolve in water and so they are found in sea and lakes water. While the metal sulphides are not so soluble rather they insoluble in nature so remains as rocks I hope this answer is helping uh.. Thank you...

1Thank You

ANSWER

What is the ph value of hcl

Posted by Nik . 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Sundaram Kumar 5 years, 11 months ago

0 is the ph value of conc. Hcl

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ANSWER

Nacl+H2O_

Posted by Md Fardeen 5 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Diksha? 5 years, 11 months ago

This rxn is only in the presence of electric current

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Pranav . 5 years, 11 months ago

Nacl+H2O----->NaOH+Cl2+H2

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Md Fardeen 5 years, 11 months ago

No reaction

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ANSWER

Where are 2019 last years q paper

Posted by Raghav Garg 5 years, 11 months ago

CBSE > Class 10 > Science

3 answers

?Roman ? 5 years, 11 months ago

<font size=50>Got it.....

1Thank You

?Roman ? 5 years, 11 months ago

<font size=30>In Question Bank

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Khushlalprasad 5496 5 years, 11 months ago

In my schl

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ANSWER

What is satured & unsatured hydrocarbon ?

Posted by K Anitha 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 11 months ago

Saturated hydrocarbons: In this type of hydrocarbons, the carbon atoms are connected by a single covalent bond. These are called alkane and general formula C_nH_2n+2 where n=1,2,3….etc. These are less reactive as they contain strong sigma bond. They do not undergo hydrogenation reaction. For example: CH₄.

Unsaturated hydrocarbons: In this type of hydrocarbons, the carbon atoms are connected by multiple bonds like double or triple bonds. The double bonded compounds are called alkene and has general formula C_nH_2n and triple bonded compounds are called alkynes and has general formula C_nH_2n-2. These are more reactive as they contain one or more pi bonds which can be easily broken. They can undergo hydrogenation reaction. For example: CH₂=CH₂ is an alkene.

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Sundaram Kumar 5 years, 11 months ago

Single Bond present between hydrogen and carbon is called saturated hydrocarbon and more than one is known as unsaturated

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ANSWER

What is an ecosystem? List its two main components

Posted by Harsh Yadav 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 11 months ago

An ecosystem is defined as a place where living and nonliving things live together interacting with each other for the sustenance of life. The two main components of an ecosystem include- biotic (living) and abiotic (nonliving) components.

Ponds and lakes are natural ecosystems where many organisms live. Thus in these ecosystems, toxic waste (ammonia) produced by living organisms is converted into the harmless form by the activity of decomposers. An aquarium contains only fishes and no decomposers. Therefore, it is necessary that the toxic ammonia produced by the fishes should be regularly removed by changing water in an aquarium.

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Dhoodhu Pc 5 years, 11 months ago

Biotic and abiotic are the 3 main components of ecosystem.

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ANSWER

Two element X and Y have atomic number 12 and 16 respectively .To which period of the modern periodic table do these element belong ?. Ehat type of bond will be formed between them and why ? Also give the chemical formula of the compound formed.

Posted by Kanak Chauhan 5 years, 11 months ago

CBSE > Class 10 > Science