CBSE > Class 09 > Science | CBSE Board | Homework Help

By solving with the formula n=m\M or n=N\No or m\M=N\No Where n=number of moles m=given mass M=molecular mass No=Avogadro constant N=number of molecules Together we write n=m\M=N\No

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Kartik Singh 7 years, 2 months ago

By multiplying by 6.023×10^23

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SI unit of wave length

Posted by Sangeeta Singh 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Akshita Yadav 7 years, 2 months ago

SI unit of wave length is lamda

3Thank You

Gaurav Seth 5 years, 11 months ago

Wavelength is the distance between two successive crests or troughs of a wave. It is always measured in the direction of the propagation of wave. As wavelength is basically the distance , so the SI unit of wavelength is meters (m).

6Thank You

Akanksha Kumari? 7 years, 2 months ago

Metre

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ANSWER

How to find chemical formula

Posted by Shaikh Atique 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Rajkumar Okte 7 years, 2 months ago

Write the symbols of element and below that its valancy and by criss cross meathod solve the problem like potassium nitrate k+ NO3- Valancy 1. 1 so ti will become KNO3

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What is the means of science.?

Posted by Ganpat Singh 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Tanu Meena 7 years, 2 months ago

Gaining knowledge of something practically

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Sandhya Singh 7 years, 2 months ago

The particular knowledge about anything is known as Science

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Aishwarya Nagrani 7 years, 2 months ago

The study of an knowledge about the pysical world and natural law

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C6H6O6+O2-CO2+H2O

Posted by Neelam Raikwar 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Ganpat Singh 7 years, 2 months ago

2 C6H6O6 + 9 O2 =12 CO2 + 6H2O

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ANSWER

A woman's oviduct are blocked then mensturation ..........?????

Posted by Ashish Kiran 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Ganpat Singh 7 years, 2 months ago

Every month during ovulation, which occurs roughly in the middle of a menstrual cycle, the fallopian tubes carry an egg from an ovary to the uterus. ... If a fallopian tube is blocked, the passage for sperm to get to the eggs, as well as the path back to the uterus for the fertilized egg, is blocked.

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what is pressure and S.I unit ???

Posted by Kirti Rana 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Ashish Kiran 7 years, 2 months ago

Thrust per unit area claaed pressure S.I. unit- pascal

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ANSWER

What is law of conservation of mass? Explain with experiment

Posted by Rajkumar Okte 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Ashish Kiran 7 years, 2 months ago

m1u1+m2u2=(m1+m2)v

2Thank You

Ashish Kiran 7 years, 2 months ago

Sum of force before collision =sum of force after collision

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ANSWER

what is force and what is its S.Iunit ??

Posted by Kirti Rana 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

M.Prajwal Prajwal 7 years, 2 months ago

A push or pull of an object is known as force Its s.i unit is N

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Anmol Kumar 7 years, 2 months ago

Push or pull on a body is called force Its s.i unit is newton(N)

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ANSWER

Hw can we find valency

Posted by Rani Mishra 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Jiya Kumari 7 years, 2 months ago

The no. Of electrons present in outermost shell is close to its full capacity then the valency is equal 8 subtract the no. Of electrons in the outermost shell For example - Element. Atomic mass. Valency K L M N Sulphur. 16. 2 8 6 Valence is 6 But valency is ( 8 - 6 )=2 Hydrogen 1 1 Therefore its valency is 1 I hope my answer easily understand and satisfied you.

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A child winds his toy car by moving its ket of engergy used up in this process

Posted by Veena Bajaj 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Rajkumar Okte 7 years, 2 months ago

While the child rotating the key he full up potential energy and when the car moves forward it convert potential energy to kinitic energy and hence said work is done

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ANSWER

Define paranchyma

Posted by Abhishek Kumar 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Sandhya Singh 7 years, 2 months ago

parenchyma is most primitive tissue. It consist of living cell thin wall and more intracellular space. It is found in root stem leaf flower and fruit.

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Harsh Dagar 7 years, 2 months ago

Actually it does not have any definition If asked,so it is a complex permanent plant tissue

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Explain the food requirement of cattles

Posted by Sukhjinder Kaur 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

The food eaten by animals is called feed. The animal feed is of two types:

(i) Roughage – It largely contains fibres such as green fodder, silage, hay and legumes.

(ii) Concentrates – It includes the mixture of substances which are rich in one or more nutrients. Concentrates are low in fibres and contains relatively high proteins and other nutrients. Example – oil seeds, cotton seeds, oats, barley, jowar, gram etc.

Feed according to age and functions are:

(i) Maintenance requirements – The food is required by the animal to support it to perform the basic functions of life.

(ii) Milk producing requirements – It includes the type of food during lactation period. Maintenance part of the ration depends upon the body weight and age while milk production part is dependent upon the level and composition of milk.

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ANSWER

Give examples of surface and bottom feeders of fishes used in fish culture

Posted by Sukhjinder Kaur 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Tanu Meena 7 years, 2 months ago

These are also given in ncert

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ANSWER

Name an indigenous and an exotic breed of poultry

Posted by Sukhjinder Kaur 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Aman Salmani 7 years, 2 months ago

Exotic is Jersey Indigeneous is sahival

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ANSWER

Give examples of finned fishes and shell fishes

Posted by Sukhjinder Kaur 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Tanu Meena 7 years, 2 months ago

Given in ncert

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ANSWER

What are the elements and atoms

Posted by Nityanand Pujari 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Akash Deep 7 years, 2 months ago

Atoms are indivisible particles which are at microscopic can't be sewn by naked eyes.... In case of element forms from a pure substance

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ANSWER

Factorise a8_b8

Posted by Lovely Singh 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Anmol Kumar 7 years, 2 months ago

8(a-b)

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Write the uses of Co-60 and U-235 .Also give the name of the element from which these isotopes belong

Posted by Gagan Kumar 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Harsh Dagar 7 years, 2 months ago

Co60 -isotope of cobalt manufactured in industries use for treatment of cancer U235-isotope of uranium used in generating electricity

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What is sonic boom??

Posted by Anjali Mehta 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Aishwarya Nagrani 7 years, 2 months ago

A loud expolsive sound caused by the sock waves

1Thank You

Akanksha Kumari? 7 years, 2 months ago

Sorry which is travelling faster than the speed of sound.?

1Thank You

Akanksha Kumari? 7 years, 2 months ago

Sonic boom refers to the explosive noise caused by the shock waves from an aircraft or any other body while is travelling faster than the speed of sound.

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What liquid compressed? Tell me how

Posted by Atif Rose 7 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Akash Deep 7 years, 2 months ago

Pressure

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ANSWER

Explain in brief the universal law of gravitation and its importance

Posted by Gagan Kumar 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Anmol Kumar 7 years, 2 months ago

Every object in the universe attracts every other object with a force which is directly proportional to product of their mass and inversely proportional to square of distance between them.

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Aishwarya Nagrani 7 years, 2 months ago

The most important part these is not only that object pull it each other but that two object attarct each other with a force that is propotional to the product of there masses and inversaly propotional to the square of the distance between them this is known as universal law of gravitaton and it importance

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ANSWER

Why are antibiotics not effective for viral diseases?

Posted by Gagan Kumar 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Khushi Boora 7 years, 2 months ago

Because they don't have their own metabolism structure.they use the structures of host.

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Anita Mahala 7 years, 2 months ago

Antibiotics is a biochemical compound effective against bacteria because they block the bacterial process of building cell wall that provide protection to the bacteria and hence it dies. But in the case of viral infection, it is caused due to virus. In the case of virus antibodies donot work because virus have few chemical pathway of their own. Indead when they enter our cell they use our machineris for their life process.

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Akanksha Kumari? 7 years, 2 months ago

Antibiotics are not effective for viral diseases because they don't kill viruses as the working and machinery of bacteria and viruses are different. Bacteria are generally simpler than the viruses.

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ANSWER

Can anyone explain me the Archimedes principle and buoyancy???

Posted by Akanksha Kumari? 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Anita Mahala 7 years, 2 months ago

If an object is fully or partially imerged in any fluid it experience an upward force which is exactly equal to the weight of the fluid displeased by it. An upward force exerted by the fluid on the object is called upthrust or buoyant force.

2Thank You

Aishwarya Nagrani 7 years, 2 months ago

Principle state that the buoyant force acting on an object immeresed in on floting on a fluid is equal to the weight of the fluid displaced by the object....... Fluid such as water or air pressure on all direction ...... Upward buoynt force which immered fully or partically is equal to tje weight of the fluid that the body displaced and act in the upward direction at the centre of the mass of the displaced fluid ........ May This Answer Will Help You Thankyou??

2Thank You

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What are alpha rays?

Posted by Gagan Kumar 7 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Sufin Rafi Rafi 7 years, 2 months ago

Alpha rays are 4u because it is double charged helium ions. 4u means unified mass

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Akanksha Kumari? 7 years, 2 months ago

Alpha rays are basically positively charged rays containing 2 protons and 2 neutrons and is identical to the nucleus of helium atomm

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All practicals

Posted by Mihir Verma 7 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is sound and how it is produce

Posted by Yash Cristiano 7 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Sufin Rafi Rafi 7 years, 2 months ago

Sounds are hear from vibrating bodies of any ☺☺☺

1Thank You

Priya Gaur 7 years, 2 months ago

Sound is a form of energy and it produces sensation of hearing in our ears and is produced by vibrating bodies ??

1Thank You

Akanksha Kumari? 7 years, 2 months ago

Sound is a form of energy which produces a sensation of hearing in our ears. It is produced by a vibrating body and travels through a medium.Hence it is also called mechanical waves.

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ANSWER

What are cisterns

Posted by Atharva Pachpande 7 years, 2 months ago

CBSE > Class 09 > Science