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

It’s your birthday today! You know what that means? It’s time to wear the hat, blow the candles and cut the cake. But don’t forget to think of all the wishes you want to make! Enjoy your day!

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?Ritesh Gupta☺️ 6 years ago

Hi ashu

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꧁༒☬☠Ashu??Mikku☠︎☬༒꧂ Tiwari 6 years ago

Hiii

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Why stars twinkling at night

Posted by Pritam Kaur 6 years ago

CBSE > Class 10 > Science

1 answers

Rohit Kumar 6 years ago

The twinkling of a star is due to the atmospheric refraction of star's light. The continuously changing atmosphere refracts the light from the stars by different amount from one moment to the next. The star light reaching our eyes increase and decrease continuously due to the atmospheric refraction. And the star appears to twinkle at night

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ANSWER

according to international colour convention what is the colour of live nd neutral nd earth wire

Posted by Shreya Keshri 6 years ago

CBSE > Class 10 > Science

3 answers

Abhi Mittal 6 years ago

Live wire is red Neutral wire is black or blue Earth wire is green

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Shreya Keshri 6 years ago

par live ka brown bolo ja rha h

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Amir Rahmani 6 years ago

Red and blue respectively.

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ANSWER

Define Saponification

Posted by Sunita Mishra 6 years ago

CBSE > Class 10 > Science

1 answers

Abhi Mittal 6 years ago

Hydrogenation of esters with NAOH/KOH to give respective alcohol (which is used in reaction ) and sodium salt of carboxylic acid. This process is known as saponification

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Progress should not be equated with evolution. Justify

Posted by Asmita Singh 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

Evolution should not be equated with Progress:

There is no real progress in the concept of evolution. Evolution is just the production of diversity of life forms and shaping of this diversity by the environmental selection. When a new species is formed, it is not necessary that the old species will disappear from earth. It will all depend on the environment. Also it is not as if the newly formed species are in any way better than the older ones. It is simply that genetic drift and natural selection processes have combined to form a population having different body design and cannot interbreed with the older population.

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What should a magnesium ribbon be cleaned before burning aair

Posted by Koro Yangfo 6 years ago

CBSE > Class 10 > Science

1 answers

Abhi Mittal 6 years ago

To remove oxide layer from magnesium ribbon to get pure magnesium

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ANSWER

honey came here

Posted by Rohit Agarwal 6 years ago

CBSE > Class 10 > Science

42 answers

Ankit Singh Thakur ?? 6 years ago

Kitni galli deta hai be tuu

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Rohit Agarwal 6 years ago

meko kesa pta kha pe ho

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Ankit Singh Thakur ?? 6 years ago

Sala Fuddu kahi ka chod apni Maa ko raha hai

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?Ritesh Gupta☺️ 6 years ago

Priya apne intro nhi diya

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Priya ??? 6 years ago

shivu sun....me brainly p aari hu vha baat krenge

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Rohit Agarwal 6 years ago

teri mummy chod rha hu vhi chilla chilla ke galiyan de ja rhi he bahot lmba he bahot mota h me kya kru ha nhi to bahn ke lnd salle chkke pta nhi tujhe peda krke kitna bdaa paap kr diya mena

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Ankit Singh Thakur ?? 6 years ago

Shivam apna Pennis chuss sala itni gaaliya Tere ghar wale Tujhe kyun sikhate hai loda sala ????

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Rohit Agarwal 6 years ago

and id login kro hogya aur chelao

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Rohit Agarwal 6 years ago

chrome pe dalo brainly.in

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Priya ??? 6 years ago

but vha inbox krskre h yrr...me dekh pungi...tu bta krte kese h??????

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Ankit Singh Thakur ?? 6 years ago

Priya behn ki fuddi Jada mat Bol Pennis kahi ki fuddiyon ki Rani ok

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Priya ??? 6 years ago

shivam plzz n chup hoja....dont be abusive????????

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Rohit Agarwal 6 years ago

ha kr skte h pr yarr vha join chat ka option nhi atta

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Rohit Agarwal 6 years ago

aur tu to mera lore jesa he mera land hi abhi tujhse bda hoga aur baap ko faltu nhi bolte gher pe atta hu teri mummy chodunga aj aur puchunga yhi sanskar diya ha apne ldke ko bapp ko faltu bolta h

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Priya ??? 6 years ago

shivm me tere niche vale q m reply krungi...vha baat krenge or apna name chng krle.....plzz

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Ankit Singh Thakur ?? 6 years ago

Tu Maa ka Fuddu Jessa hai aur baap ka Pennis ok

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Priya ??? 6 years ago

yr msg ni krskti...bhai phn leleta h achanak s....yrr aadya or buddy btare thile chorme s login krskte h....but meko ni aata krna????

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Ankit Singh Thakur ?? 6 years ago

Abe apne baap se galli sikhta hai aacha pure khandan ko Sanskar hi Nahi hai sare Ek doosre ko chod le rahte hai Ohhhh... OK nice do and enjoy and pass this trait generation to generation OK

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Rohit Agarwal 6 years ago

whastapp pe msg kro 93 vale no pe

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Rohit Agarwal 6 years ago

shi me yarr koi trika nhi h

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Priya ??? 6 years ago

shivam yrr bta n....ldaii mt kr tu yrr

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Rohit Agarwal 6 years ago

yarr koi trika nhi h bina download kre

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Rohit Agarwal 6 years ago

behan ke lnd mera sa faltu na bola kr tera baap jesa hu

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Rohit Agarwal 6 years ago

salle to pehla gali kyu de rha he

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Priya ??? 6 years ago

hlw ashu....my self honey ???priya name is fake

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Ankit Singh Thakur ?? 6 years ago

Nikal KE to bata Teri Maa to puri fudi hai aur behn fuddyon ki rani

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꧁༒☬☠Ashu??Mikku☠︎☬༒꧂ Tiwari 6 years ago

Hii priya sis

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Priya ??? 6 years ago

troy bhai plzz stop.......please bro

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Ankit Singh Thakur ?? 6 years ago

Samjha

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Ankit Singh Thakur ?? 6 years ago

Jada galli mat de varna kaat doonga Tera

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Ankit Singh Thakur ?? 6 years ago

Sala Kutta kahi kaa suck boobs of sister sala Pennis kahi ka

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Ankit Singh Thakur ?? 6 years ago

Tu karta hai Aisa Teri baat Kar raha hoon

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Rohit Agarwal 6 years ago

jake maa chuda behan ke lnd mood mnn na khrab kr nhi to teri maa behn yhi nikal dunga bosdk

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Priya ??? 6 years ago

shivam yrr kya prb h ye...yrr btade brainly login kese kru bina intall kre?????vhi baat krlenge

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Rohit Agarwal 6 years ago

accha tu asa hi krta he kya jo updas de rha he

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Rohit Agarwal 6 years ago

paper ka kya hua deep

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Rohit Agarwal 6 years ago

teri mummy choduna asa thik h

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Ankit Singh Thakur ?? 6 years ago

What a Behnchod you are go and chod your sister with applying honey sweet sweet ? OK enjoy

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Priya ??? 6 years ago

m mst??

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Rohit Agarwal 6 years ago

hii babu kesa ho

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Rohit Agarwal 6 years ago

kesa ho

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Rohit Agarwal 6 years ago

hi babu

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ANSWER

The refractive index of material A with respect to B is 2.5 if absolute refractive index of A is 1.5 Find the absolute refractive index of B

Posted by Vinod Kumar Gupta Gupta 6 years ago

CBSE > Class 10 > Science

2 answers

Abhi Mittal 6 years ago

0.6

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Kush J 6 years ago

0.6

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Name the hormones secreter by the following endocrine gland and specify one functione of each : (a).Thyroid (b).pituitary (c).Pancras

Posted by Bharat Choudhary 6 years ago

CBSE > Class 10 > Science

5 answers

Bharat Choudhary 6 years ago

Troy ranger tmko answer nai karna hai toh mot kro thik hai faltu bhaat mot kro

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Avni Gupta 6 years ago

(a)thyroxine (b)growth harmone (c)insulin FUNCTION :A) It regulates carbohydrate ,protien and fat metabolism for balanced body growth. B) It regulates growth and development of body . C) It regulateor decrease the blood sugar level . It also secretes glucagon that regulates or increase blood sugar level.

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Ankit Singh Thakur ?? 6 years ago

Baki information apne Fuddu se PUCH loda kaise daale and sck boooooooooooooooooooooooooooooooooooooobs of sister OK enjoy

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Ankit Singh Thakur ?? 6 years ago

A Thyroxine B is growth hormone c Insulin

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Kush J 6 years ago

(a) thyroxine hormore, control and mantain BMI(body mass ratio) . (B) growth hormore , control growth of body . (C) insulin , lowers blood sugar level

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ANSWER

What is meant by power of a lens? Write it's SI unit.A student uses a lens of focal length 40 cm and another of -20 cm .Write the nature and power of each lens.

Posted by Bharat Choudhary 6 years ago

CBSE > Class 10 > Science

1 answers

Avni Gupta 6 years ago

Power of a lens is defined as the ability of the lens to converge the rays of light falling on it. Its SI unit is Dioptre (D) Lens A Focal length (f)= 40 P=1/f (in metres) =1/0.4 = +2.5 D Lens B Focal length (f)=-20 P=1/f(in m) =1/-0.2 =-5 D

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Hi, ??? All of my?? dear friend How's your study?? now of science ? I hope that you do well in that also ?

Posted by ꧁༒☬Sowndu☬༒꧂???꧁༒????༒꧂ ??? 6 years ago

CBSE > Class 10 > Science

6 answers

Ankit Singh Thakur ?? 6 years ago

What a Fck off guys you are

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꧁༒☬☠Ashu??Mikku☠︎☬༒꧂ Tiwari 6 years ago

Kya hii

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????? ?????? 6 years ago

Hii ashu

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Priya ??? 6 years ago

yep???

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????? ?????? 6 years ago

Thanks

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꧁༒☬☠Ashu??Mikku☠︎☬༒꧂ Tiwari 6 years ago

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What is mutations and genetic drift

Posted by Rani Mishra ??? 6 years ago

CBSE > Class 10 > Science

3 answers

Rani Mishra ??? 6 years ago

???????

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Rani Mishra ??? 6 years ago

What about genetic drift

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Kush J 6 years ago

Very drastic variation are called mutations. Organisms with mutations will not be able to survive in cellular apparatus.

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(a).Write joule's law of heating. (b).Two lamps,one rated 100 W; 220V,and the other 60W;220V,are connected in parallel to electric mains supply,Find the current drawn by two bullbs from the line,if the supply voltage is 220V.

Posted by Bharat Choudhary 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

The effect of electric current due to which heat is produced in a conductor, when current passes through it, is called the heating effect of electric current.

The total work (W) done by the current in an electric circuit is called electric energy and is given as

W = VIt = I²Rt

W = V² t /R

This energy is exhibited as heat. Thus, we have H = VIt = I2Rt.

This is called Joule’s Law of Heating, which states that the heat produced in a resistor is directly proportional to the Square of the current in the resistor, Resistance of the resistor, Time for which the current flows through the resistance

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Pdf

Posted by Arun Raj 6 years ago

CBSE > Class 10 > Science

3 answers

Abhi Mittal 6 years ago

What

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Rani Mishra ??? 6 years ago

Shut up

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Kush J 6 years ago

Are u a chodu

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What is formula of 1sulphide 2sulphate 3sulphite 4sulphorous acid (not sulphuric)

Posted by Kush J 6 years ago

CBSE > Class 10 > Science

0 answers

ANSWER

What you mean by scum

Posted by Noufal N 6 years ago

CBSE > Class 10 > Science

1 answers

Kush J 6 years ago

Insoluble precipitate formed when soap reacts with calcium and magnesium salts present in hard water

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ANSWER

Name two sources of energy which do not relate sun

Posted by Ashish Goyal 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 6 years ago

Wind energy and hydroenergy.

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ANSWER

Name one gustatory receptor and one olfactory receptor present in human beings

Posted by Barbie Barbie 6 years ago

CBSE > Class 10 > Science

1 answers

Kush J 6 years ago

Gustatory - taste buds present on tounge Olfactory- nose

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What is the mean by power of accommodation of the eye ?

Posted by Rajesh Yadav 6 years ago

CBSE > Class 10 > Science

1 answers

Ashish Goyal 6 years ago

The ability of an eye to focus the distant object as well as the nearby object on the retina by changing the focal length of its lens is called the power of accommodation

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Alkane formula

Posted by Umar 7 Umar 7 6 years ago

CBSE > Class 10 > Science

1 answers

????? ?????? 6 years ago

C2h2n+2

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What is the significance of arrows in the reactant and produts

Posted by Shivam Kumar 6 years ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years ago

The substances that are used up in a chemical reaction (starting material) are the reactants and the new substances formed are called the products.

Reactants are written on the L.H.S. of the arrow. Products are written on the R.H.S. of the arrow.

For example,

2H₂ + O₂ → 2H₂O

Reactant Product

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???? ??? ??? ???? ?? ??????????? ????????? ?

Posted by ????? ?????? 6 years ago

CBSE > Class 10 > Science

1 answers

Sowndaryaa Lakshmi V 6 years ago

Hii

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May i get the blue print for science board exam 2020

Posted by Khushboo Bajaj 6 years ago

CBSE > Class 10 > Science

1 answers

Anustha D 6 years ago

Section-A Questions 1-14 will be 1 markers (total 20 marks including sub parts of some questions) . Section-B Questions 15-24 will be 3 markers (total 3×10=30). Section-C Questionss 25-30 will be 5 markers(total 6×5=30).

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Which metal is hard and has high melting point and used in filament of bulb

Posted by Abhi Mittal 6 years ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years ago

The metal is tungsten.

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ANSWER

Which is lightest liquid metal

Posted by Abhi Mittal 6 years ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years ago

Mercury (Hg) is the lightest liquid metal.

At room temperature, mercury is a liquid and its density is 13.6 times more than that of the water. The mercury's atomic number is 80, and then it is represented by the Hg symbol, which means hydrargyrum.

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Refraction through a glass slab?

Posted by ]••´º´•» Ｄί?Ş?? «•´º´••[• 6 years ago

CBSE > Class 10 > Science