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

Element X is sodium (Na) and element Y is oxygen (O) Therefore formula will be Na2O Sodium oxide (Na2O) Hope u find the answer right and if it is right then welcome as well thank u

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Chandresh Tiwari 5 years, 1 month ago

Formula will be X2Y

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What is generator ? And its Types ?Explain it

Posted by Virender Singh 5 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Aditya Anuj 5 years, 1 month ago

A device which convert chemical energy into electric energy There is two type of generator A) AC generator B) BC generator i) AC generator:- It is a type of generator which produce alternative current. ii)DC generator:-It a type of generator which produce direct current

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Messenger's periodic law

Posted by Y 2 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 8 months ago

The physical and chemical properties of elements are a periodic function of their atomic weights.

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what is Viable seed❓

Posted by Sumesh ☺️☺️☺️ 5 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Tanu Choudhary # 5 years, 1 month ago

Kyo doubt h ? Experiment kar k dekh with anyone may be your mother or sister...... don't you love them? You yourself hurt when they got hurt, don't you?........

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Sumesh ☺️☺️☺️ 5 years, 1 month ago

???

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Teresa Singh ✌🏻 5 years, 1 month ago

aacha ji Love ek bimari h kya!!??......❤️

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Secret ??? 5 years, 1 month ago

Seed or plant viability is the measure of how many seeds or how much plant material in a lot are alive and could develop into plants that will reproduce under appropriate field conditions. It is very important that seeds or plant material stored in the genebank are capable of producing plants when sown in the field.

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Aryan Ayush 5 years, 1 month ago

A variable speed of light (VSL) is a feature of a family of hypotheses stating that the speed of light in vacuum, usually denoted

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calculate the amount of work done to carry 4c of charge from a point at 100v to a point at 120v

Posted by R S 5 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Good Day 5 years, 1 month ago

V=120-100 =20V Work done =? Charge = 4C Work done = potential difference × charge = 20 × 4 = 80 j

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Abhinav Sharma 5 years, 1 month ago

Pd = Work done/Charge work = pd × charge = 20 × 4 80 joule

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Sumesh ☺️☺️☺️ 5 years, 1 month ago

80 joule

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Which substance is absorbed in large intestine?

Posted by Neha Kashyap 5 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Ankur Mishra 5 years, 1 month ago

Water

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Harsh Verma 5 years, 1 month ago

It absorb water and salt

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Srihitha Vinnu 5 years, 1 month ago

The large intestine is much broader than the small intestine and takes a much straighter path through your belly, or abdomen. The purpose of the large intestine is to absorb water and salts from the material that has not been digested as food, and get rid of any waste products left over

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What is the syntefic name of human body

Posted by Mansi Rathi 5 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Srihitha Vinnu 5 years, 1 month ago

Homo

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Neha Kashyap 5 years, 1 month ago

Homo Sapiens

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Saniya Rawat 5 years, 1 month ago

Homo spains

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Prachi Khubyan 5 years, 1 month ago

I don't know

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Nikhil Raj 5 years, 1 month ago

Homo sapians

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What happens when egg is not fertilized in the female body

Posted by Aman Kumar 5 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Tanu Kuhar 5 years, 1 month ago

the lining (endometrium wall) slowly breaks and comes out through the ****** as blood and mucous. This cycles is known as menstruation

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Ambika Kumari 5 years, 1 month ago

When egg is not fertilized in women's body then, the bag of waste blood sheds off and then bleeding start in women body it becomes mensuration period.

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Seema Choudhary 5 years, 1 month ago

If the egg is not fertilized the woman's body sheds the egg and the endometrium. This shedding causes the bleeding in a woman's menstrual period.

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What are the different methods to prevent unwanted pregnancy

Posted by Aman Kumar 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Ambika Kumari 5 years, 1 month ago

1.Female sterilization and male sterilization 2.Oral contraceptivepill 3.Emergency contraceptive pill

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Good Student 5 years, 1 month ago

https://en.hesperian.org/hhg/Health_Actions_for_Women:Methods_for_preventing_pregnancy

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How can we prevent STDs sexually transmitted desease

Posted by Aman Kumar 5 years, 1 month ago

CBSE > Class 10 > Science

1 answers

U Can U Can 5 years, 1 month ago

Use of contraceptive devices Have safe sexual intercourse Check medically before blood donation

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How can we prevent the disease AIDS

Posted by Aman Kumar 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Tanu Choudhary # 5 years, 1 month ago

Seem, In biology there is no space for ******* you can write it directly. And condoms are only used by men during *** to prevent transfer of sperms in female's body

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Seema Choudhary 5 years, 1 month ago

HIV is spread through semen, vaginal fluids, blood, and breast milk. Protect yourself by using condoms every time you have ***. You can also ask your doctor about any medicine which helps in preventing from AIDS

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Why glycerin is called negative catalyst

Posted by Lovely Ray 5 years, 1 month ago

CBSE > Class 10 > Science

1 answers

Prabodini Nakte 5 years, 1 month ago

Platinum black as a catalyst accelerates the combination of hydrogen and oxygen to form water. Similarly, the catalyst that decreases the rate of reaction is known as negative catalyst or inhibitor and the process is known as negative catalysis or inhibition. ... Here glycerol acts as negative catalyst.

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Why Methanol is poisonous in nature ?

Posted by Mangal Singh Panwar 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 8 months ago

However, unlike ethanol, methanol is highly toxic and unfit for consumption. Methanol when drunk is metabolized first to formaldehyde and then to formic acid or formate salts. These are poisonous to the central nervous system and may result in blindness, coma, and death.

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What is neutral salts give examples

Posted by Aman Kumar 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Kiran Kumari 5 years, 1 month ago

The salt which is neither acidic nor basic in nature is called neutral salt. For example water.

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U Can U Can 5 years, 1 month ago

Nacl

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What is the chemical name of bleaching powder ?

Posted by Aman Kumar 5 years, 1 month ago

CBSE > Class 10 > Science

5 answers

Priyanka Meher 5 years, 1 month ago

Calcium oxychloride

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Neha N 5 years, 1 month ago

Calcium hypochlorite

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Neha N 5 years, 1 month ago

Sodium Hydrogen Carbonate

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Aman Kumar 5 years, 1 month ago

Is anyone here, I am waiting

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Aman Kumar 5 years, 1 month ago

Answer fast

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ANSWER

state the laws of teftaction of light

Posted by Haiman Sami 5 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Ankur Mishra 5 years, 1 month ago

The ratio of angle of incidence to the ratio of angle of refraction of refraction is constant for any given color of light this is called snails law Angle of incidence ,angle of refraction and normal from the point of incidence all lie in same plane

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Misty Chan 5 years, 1 month ago

Do u mean refraction of light?? Don't you?

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Aman Kumar 5 years, 1 month ago

Hiii

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What is the chemical name of baking soda?

Posted by Aman Kumar 5 years, 1 month ago

CBSE > Class 10 > Science

4 answers

Secret ??? 5 years, 1 month ago

Swati=baking soda????

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Saniya Rawat 5 years, 1 month ago

Sodium hydrogen carbonate

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U Can U Can 5 years, 1 month ago

Nahco3

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Neha N 5 years, 1 month ago

Sodium Hydrogen Carbonate

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What is the chemical name of baking soda

Posted by Aman Kumar 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Alan Joy 5 years, 1 month ago

Sodium hydrogen carbonate

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Krazy Girl 5 years, 1 month ago

Sodium hydrogen carbonate

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Give one example of convergent rays

Posted by Aryan Tiwari 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Aryan Tiwari 5 years, 1 month ago

Thanks

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Bhoomika Verma 5 years, 1 month ago

Example --- Parallel beam of sunlight are made to incident on solar cooker consisting of concave mirror so that the rays converge at focus point.

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When the distance of an object from a concave mirror is decreased from 15 cm to 9cm, the image gets magnified 3 times than that in the first case. Calculate the focal length of the mirror

Posted by Aachal Satwan 4 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Sia ? 4 years, 8 months ago

Magnification = Image distance / Object distance

In this case :

Let the magnification in the first case be x.

The magnification in the second case will be 3x.

The mirror formula is :

1/u + 1/v = 1/f

The first case

Magnification = x

Object distance = 25 cm

Image distance = Object distance × Magnification

= 15x cm

Now :

1/15 + 1/15 x = 1/f

Lcm = 15x

Solving we have :

(1 + x)/15x = 1/f

f = 15x/(1 + x)

Second case

Object distance = 9 cm

magnification = 3x

Image distance = 27x cm

1/9 + 1/27x = 1/f

Lcm = 27x

(3x + 1)/27x = 1/f

f = 27x/(3x + 1)

Since we have two values of f we can equate them as follows:

27x/(3x + 1) = 15x/(x + 1)

Solving for x we have :

27x(x + 1) = 15x(3x + 1)

27x² + 27x = 45x² + 15x

Collecting like terms together

45x² - 27x² = 27x - 15x

18x² = 12x

Divide through by x

18x = 12

x = 12/18

x = 2/3

Substitute to get f:

f = (27 × 2/3)/(3 × 2/3 + 1)

f = 18/3

= 6 cm

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What is isomarism?

Posted by Rohit Mandal 5 years, 1 month ago

CBSE > Class 10 > Science

2 answers

Shivraj Pawar 5 years, 1 month ago

The compounds having same molecular formula but different structures is called isomers and these phenomenon is called as isomerism.

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Kiran Kumari 5 years, 1 month ago

The existence, of the molecule have same atom of same no.but different physical and chemical peroperty .

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First 20 elements with attomic no. name and symbol?

Posted by Ranveer Singh Sidhu 5 years, 1 month ago

CBSE > Class 10 > Science

3 answers

Aman Kumar 5 years, 1 month ago

Hydrogen(H) hello Helium. (He) hii Lithium. (Li) listen Beryllium (Be) B Boron. (B) B Carbon. (C) C Nitrogen. (Ne) News Oxygen. (O) of Fluorine (F) Foren Neon. (Ne) nena Sodium. (Na) " Magnesium (Mg) mar gyi Aluminum. (Al) all Silicon. (Si) Sarcaari Phosphorus (P) private Sulphur. (S) school Chlorine. (Cl) closed Argon. (Ar) aur Potassium (K) kya Calcium (Ca) carna! Guys I have also mention an easy trick to learn these twenty elements, hope this help, hit a thanks button The trick is mention side by side, read its a story

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Kiran Kumari 5 years, 1 month ago

Helium (he)=2

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Kiran Kumari 5 years, 1 month ago

Hydrogen =1(H) Helium =2(Ge) Lithium =3(Li) Berelium=4(BE) Boron=5(B) Carbon=6(C) Nitrogen=7 (N) Oxygen=8 (o) Flourine=9(f) Neon=10(Ne) Sodium =11(Na) Magnesium=12(Mg) Aluminium =13(Al) Silicon =14(si) Phosphorus =15(ph) Sulphur=16 (s) Chlorine=17 (cl) Argon=18(Ar) Potassium=19 (k) Calcium =20 (ca)

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chromosomes are heridity carriers". why do we say so? which function is not controlled by autosomes?

Posted by Unnimaya M.S 5 years, 1 month ago

CBSE > Class 10 > Science