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

Unsaturated hydrocarbons like ethyne, also known as acetylene, burn to produce a yellow, sooty flame due to incomplete combustion in air. The flame is sooty because the percentage of carbon is comparatively higher than that of alkanes and so does not get completely oxidized in air.

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ANSWER

Waht is a chemical eqution

Posted by Vidyanand Yadav 6 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Nirmal Kumawat 6 years, 4 months ago

Symbolic representation of any chemical equations is called chemical equations

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Asmilo Hall 6 years, 4 months ago

Hi Aadya! Gm khle?

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Aadya Singh ? 6 years, 4 months ago

The method of representing a chemical reaction with the help of symbols and formulae of the substance involved in it is known as chemical equation.

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Asmilo Hall 6 years, 4 months ago

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side.

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ANSWER

What is function of pupil??

Posted by ? ... 6 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Nirmal Kumawat 6 years, 4 months ago

The main function of pupil is at what amount of light should enter in our eye It mainly depends on intensity of the light Place where intensity of light is high pupil became small Place where intensity of light in low pupil get enlarge

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Asmilo Hall 6 years, 4 months ago

The pupil of the eye is the black circle in the center of the iris. The whole job of the iris and pupil is to control the amount of light that gets into the eye. It's called a pupillary reflex, and you have probably noticed that a person's pupils are smaller in bright light and bigger in low light.

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ANSWER

In which of the following compounds -OH is the funcational group

Posted by Saurabhroy Roy 6 years, 4 months ago

CBSE > Class 10 > Science

7 answers

Saurabhroy Roy 6 years, 4 months ago

Tysm ....

0Thank You

Sahil ??? 6 years, 4 months ago

CH3OH,C2H5OH,C3H7OH,.....and many more of this homologous series.

1Thank You

Diksha 6 years, 4 months ago

Ethanol, propanol, butanol, pentanol,etc

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Aadya Singh ? 6 years, 4 months ago

Ethanol

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Kanchan Halder 6 years, 4 months ago

Please give the compounds

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Kanchan Halder 6 years, 4 months ago

Alcohol

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Bipin Jaiswal 6 years, 4 months ago

Alcohol

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ANSWER

What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur

Posted by Sartaj Qureshi 6 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Aarti Rana 6 years, 4 months ago

Ring like and closed

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ANSWER

what is trophic level ? (in biology)

Posted by Rishabh Verma 6 years, 4 months ago

CBSE > Class 10 > Science

2 answers

A.T'S Gaming 6 years, 4 months ago

A trophic level is the group of organisms within an ecosystem which occupy the same level in a food chain.

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Asmilo Hall 6 years, 4 months ago

The trophic level of an organism is the number of steps it is from the start of the chain. A food chain starts at trophic level 1 with primary producers such as plants, can move to herbivores at level 2, carnivores at level 3 or higher, and typically finish with apex predators at level 4 or 5.

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ANSWER

Local people have a major stake in forest resource. Illustrate giving four example how conservation of forests is essential for the existence of their life.

Posted by Ankit Kumar Ray 6 years, 4 months ago

CBSE > Class 10 > Science

2 answers

A.T'S Gaming 6 years, 4 months ago

yeh kaisa ans

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Rishabh Verma 6 years, 4 months ago

haat

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ANSWER

Compose an activity to arrange ca,Mg and Fe metal in the decreasing order of reactivity with water . write suitable balanced chemical equation and draw diagrams.

Posted by Ankit Kumar Ray 6 years, 4 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What is green house effect?

Posted by Ayush Gusain 6 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Asmilo Hall 6 years, 4 months ago

The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without this atmosphere. Radiatively active gases in a planet's atmosphere radiate energy in all directions.

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ANSWER

what does it mean by catenation

Posted by Mohammed Ayan 6 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Nirmal Kumawat 6 years, 4 months ago

Ability to form a long chain like of any element is called catenation

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Roman ? Reigns ? 6 years, 4 months ago

The unique property of carbon to form bonds with other atom of carbon is known as Catenation

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ANSWER

Why magnetic field lines don't cross each other?

Posted by Ankita Borpujari 6 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Nirmal Kumawat 6 years, 4 months ago

Because if magnetic feild lines will cross then there wil be tow source which cannot possible

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Aarti Rana 6 years, 4 months ago

Because if magnetic field lines intersect each other than there point of intersection shows different direction of magnetic field which is not possible

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Roman ? Reigns ? 6 years, 4 months ago

Because different magnetic effect is present at every point around the magnet

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ANSWER

Why there is variation is in eye colour?

Posted by ? ... 6 years, 4 months ago

CBSE > Class 10 > Science

1 answers

A.T'S Gaming 6 years, 4 months ago

Because of the variation in person's genes

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ANSWER

Explain ions in easy words

Posted by Qwerty G 6 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Innovative Bureau 6 years, 4 months ago

Ion is a form of an element which has unequal number of protons and electrons due to which it develops a negative or positive charge. This may be due to non covalent sharing of electrons between compounds or due to heating of an atom such temperatures such that it force of attraction between the nucleus and electrons is overcome.

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Aadya Singh ? 6 years, 4 months ago

*ions

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Aadya Singh ? 6 years, 4 months ago

An iron is an electrically charged atom or a group of atoms.

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ANSWER

What is apparent flickering of objects?

Posted by Rashi Bhutani 6 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 4 months ago

We observe random wavering or flickering of the objects near a fire on a very hot day due to atmospheric refraction. The air just above the fire become hotter than the air further up. Hot and is lighter than cold air above it. Refractive index of the hot air is slightly less than that of the cold air. Since, the density does not remain the same , the Apparent position of the object as seen through hot air ,fluctuates.

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ANSWER

How are alloys are prepared P

Posted by Muskan Kumari 6 years, 4 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Why oil does not mix with water?

Posted by ?Harshitha? Harshi 6 years, 4 months ago

CBSE > Class 10 > Science

9 answers

Hitesh Bhandari 6 years, 4 months ago

They are immesible liquids

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Atik Ahmed 6 years, 4 months ago

The molecules of Oil is much bigger than water droplets that why oil does not mix absolutely

1Thank You

Shivam Mishra 6 years, 4 months ago

Nhi to suna ga tu mujhse acche se

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Shivam Mishra 6 years, 4 months ago

Deepika meri ha aur apna nam change ker le

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Shivam Mishra 6 years, 4 months ago

Abe o deepika dewane vo meri ha nikl le yha se

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? Queen ? 6 years, 4 months ago

Ooyye...suno...??yeh toh mera style hh n...apne kyu lgaya ???

1Thank You

Rohit Friend Deepika 6 years, 4 months ago

Hii deepika

1Thank You

Raghav Dwivedi 6 years, 4 months ago

Smooth

0Thank You

Nisarg Desai 6 years, 4 months ago

Because is an immiscible liquid and is denser than water.

2Thank You

ANSWER

Explain the working of the electric motor.

Posted by Payal Priya 6 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years, 4 months ago

When the current begins to flow, current flows through brush X, then A to B, B to C, C to D and then to brush Y and into the battery.
Now applying Fleming's Left Hand Rule to wire AB, Current is along AB, Magnetic Field is as shown (North-> South), the motion of the wire is downwards.
Now applying Fleming's Left Hand Rule to wire CD, Current is along CD, Magnetic Field is as shown (North-> South), the motion of the wire is upwards.
The rectangular coil begins to move in the anti-clockwise direction
Note that during anti-clockwise motion, the split rings and axle also move, whereas the brushes don't move.
After half a rotation, Wire CD and Split ring Q moves to the left. Wire AB and Split ring P moves to right. Brushes X and Y donot move.
Now applying Fleming's Left Hand Rule to wire CD, Current is along DC. (Battery -> Split ring Q -> DC , Magnetic Field is as shown (North-> South), the motion of the wire is downwards.
Now applying Fleming's Left Hand Rule to wire AB, Current is along BA. (Battery -> Split ring Q -> DC --> CB -> BA --> Split ring P) , Magnetic Field is as shown (North-> South), the motion of the wire is upwards.
So, again the coil rotates in the anti-clockwise direction.
The reversal of current in the coil results in the continous rotation of the coil. The reversal of current is achieved by the commutator rings

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ANSWER

How many cells

Posted by Lakshika Garg 6 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Lakshika Garg 6 years, 4 months ago

2Thank You

ANSWER

How does money solve the problem of double conicidence of wants?

Posted by Kunal Tiwari 6 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Aadya Singh ? 6 years, 4 months ago

Double coincidence of wants is an essential feature where goods are directly exchange without the use of money is also known as barter system .By serving as a medium of exchange money removes the need of double coincidence of want and the difficulties associated with barter system.

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Saurabh Yadav 6 years, 4 months ago

It became the medium of exchange between goods

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ANSWER

Why we considered only north and south pole in a magnet rather than east or west pole of a magnet?

Posted by Rupa Rani 6 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Vamsi Krishna 6 years, 4 months ago

Like poles repel

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Asmilo Hall 6 years, 4 months ago

The Earth's magnetic field induces a magnetic torque. The 'North (Seeking) Pole' of a magnet is therefore identical to the 'South Pole' of the Earth since it is attracted toward the Eath's north magnetic pole - opposites attract.

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ANSWER

Science working model making

Posted by Bablu Singh 6 years, 4 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

A compound x is heated with y at 443k and produced unsaturated hydrocarbon z. Find x,y and z?

Posted by ? ... 6 years, 4 months ago

CBSE > Class 10 > Science

1 answers

Sarda Jagdev 6 years, 4 months ago

Wyh sky blue

2Thank You

ANSWER

OK bye... Good night friends... Sab bina bataye do gye... It's Okh.. Bye ????

Posted by Jacquilene? Fernandez 6 years, 4 months ago

CBSE > Class 10 > Science

44 answers

Asmilo Hall 6 years, 4 months ago

Wait

1Thank You

Jacquilene? Fernandez 6 years, 4 months ago

Pika pi... Come in my question

1Thank You

Shivam Mishra 6 years, 4 months ago

Kha gye seb ke seb

1Thank You

Shivam Mishra 6 years, 4 months ago

Koi nya questio bnao

1Thank You

Jacquilene? Fernandez 6 years, 4 months ago

Okh... No prb shivu

1Thank You

Jacquilene? Fernandez 6 years, 4 months ago

Antartica

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Shivam Mishra 6 years, 4 months ago

Shi baat me chela gya aur pura mood khrab ho gya apka pr aj nhi jaunga

1Thank You

Jacquilene? Fernandez 6 years, 4 months ago

Ash will u make question plz.. It's too below yrr

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Asmilo Hall 6 years, 4 months ago

America

1Thank You

Asmilo Hall 6 years, 4 months ago

I m also gd bt tensed 2!?

3Thank You

Jacquilene? Fernandez 6 years, 4 months ago

Asia

1Thank You

Jacquilene? Fernandez 6 years, 4 months ago

I m fine sis... What about u dear?

1Thank You

Asmilo Hall 6 years, 4 months ago

Australia...Ab ap last letter se blo i.e., A

3Thank You

Shivam Mishra 6 years, 4 months ago

Ash ok chelo kehlange

2Thank You

Jacquilene? Fernandez 6 years, 4 months ago

Meri glti nhi thi.. Aap hi chle gye the ?

1Thank You

Shivam Mishra 6 years, 4 months ago

Aj baat ker lena

1Thank You

Asmilo Hall 6 years, 4 months ago

Ksi ho ap Deep?

3Thank You

Shivam Mishra 6 years, 4 months ago

Me offline ho gya tha glti se

1Thank You

Shivam Mishra 6 years, 4 months ago

Kitna romantic mood tha apka brainly per

1Thank You

Shivam Mishra 6 years, 4 months ago

Kosis ker ke a jana yarr please kel raat bhi baat nhi ho pai

1Thank You

Jacquilene? Fernandez 6 years, 4 months ago

Hii shivu and ash ☺

2Thank You

Shivam Mishra 6 years, 4 months ago

Hii deepu

1Thank You

Asmilo Hall 6 years, 4 months ago

Hi Deep!

1Thank You

Jacquilene? Fernandez 6 years, 4 months ago

Yrr confirm to nhi khskte.. Pr aane Ki puri kosish krungi raat ko

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Asmilo Hall 6 years, 4 months ago

Place names

1Thank You

Asmilo Hall 6 years, 4 months ago

Thx Shivam!

3Thank You

Shivam Mishra 6 years, 4 months ago

Accha asmita so nice name

2Thank You

Asmilo Hall 6 years, 4 months ago

Asmita

3Thank You

Shivam Mishra 6 years, 4 months ago

Vesa apka pura nam kya he

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Shivam Mishra 6 years, 4 months ago

Thanks ashy

2Thank You

Asmilo Hall 6 years, 4 months ago

I m also gd

3Thank You

Asmilo Hall 6 years, 4 months ago

Very nice Shivam?

3Thank You

Shivam Mishra 6 years, 4 months ago

Aur apne shi kha tha deep mujhse raat me baat krne ayi thi

2Thank You

Shivam Mishra 6 years, 4 months ago

Jldi message kro pdh ke

1Thank You

Shivam Mishra 6 years, 4 months ago

Niche shreya ka question me mena 3 sayri likhi he pdh ke btao kesi he uper se 2 deep ke liya aur jo sebse niche he vo shreya ke liya

1Thank You

Shivam Mishra 6 years, 4 months ago

Me to thik hu ap btao

2Thank You

Asmilo Hall 6 years, 4 months ago

What's up Shivam?

2Thank You

Shivam Mishra 6 years, 4 months ago

Hii ash

1Thank You

Asmilo Hall 6 years, 4 months ago

Hi guys! Gd mrng!?

2Thank You

Shivam Mishra 6 years, 4 months ago

deepu a jana online cutie

1Thank You

Shivam Mishra 6 years, 4 months ago

aj raat sirf hm apni baat krenga ok a jana online

1Thank You

Shivam Mishra 6 years, 4 months ago

verna me soya nhi

1Thank You

Shivam Mishra 6 years, 4 months ago

honey mera ;aptop aur mobile dono papa le gya the kl rat achank se ake

1Thank You

Jacquilene? Fernandez 6 years, 4 months ago

So*

0Thank You

ANSWER

Explain motor generator

Posted by John Nirmal 6 years, 4 months ago

CBSE > Class 10 > Science

3 answers

Gouri Patil 6 years, 4 months ago

Its a dvice which converts electrical energy into mechanical energy

1Thank You

Yogita Ingle 6 years, 4 months ago

The electric motor, generator, and transformers all work on the principle of electromagnetic induction. The electric motor converts electrical energy into mechanical work. The electric generator works in the opposite way of an electric motor. It converts mechanical work into electrical energy. The source of mechanical energy varies from a wide range of hand cranks and combustion engines.

2Thank You

Aadya Singh ? 6 years, 4 months ago

Electric motor is a device which converts electrical energy into mechanical energy.

2Thank You

ANSWER

Calcium react with hot water or cold water . Give answer

Posted by ꧁༒Ķïłłěŕ_Ṩนℑåł༒꧂, Sharma 6 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Vamsi Krishna 6 years, 4 months ago

Calcium hydroxide

1Thank You

Asmilo Hall 6 years, 4 months ago

Calcium reacts moderately with water, forming hydrogen gas and the slightly soluble calcium hydroxide(milky suspension). Magnesium has almost no reaction with cold water. It reacts slowly with hot water to give the slightly soluble magnesium hydroxide and hydrogen.

2Thank You

ANSWER

Explain cleansing action of soap?

Posted by Akshat Verma 6 years, 4 months ago

CBSE > Class 10 > Science

2 answers

Ameera Shajahan 6 years, 4 months ago

Very BTU hi

0Thank You

Yashi .... 6 years, 4 months ago

At the surface of the water the hydrophobic tail of soal will be insoluble in water and the soap will align along the surface of water. with the ionic end in water and the hydrocarbon tail protruding out of water. Inside the water these molecules show a unique orientation that keep the hydrocarbon portion out of the water. This is done by forming clusters of molecules in which the hydrophobic tails are in the interior of the cluster and on the surface of clustetr, ionic and ends are present. This formation of cluster of molecule is called micelle. To wash away with the loosened particles in the form of Micelle from the surface of the cloth it is either scrubed or mechanically beaten. Micelle is there is colloids in the solution and does not come together precipitate due to ion and ion repulsion. So ,the dust suspended in the micelle is also rinsed way.

5Thank You

ANSWER

What is electric flux?

Posted by Raushan Kumar 6 years, 4 months ago

CBSE > Class 10 > Science

4 answers

Asmilo Hall 6 years, 4 months ago

Hlo Shivam! What's up?

1Thank You

Shivam Mishra 6 years, 4 months ago

Hii ash

1Thank You

Asmilo Hall 6 years, 4 months ago

In electromagnetism, electric flux is the measure of the electric field through a given surface, although an electric field in itself cannot flow. It is a way of describing the electric field strength at any distance from the charge causing the field.

2Thank You

Yashi .... 6 years, 4 months ago

Electric flux is the measure of the electric field of a given surface.

4Thank You

ANSWER