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

The SI unit of current is called 1 ampere. When 1 coulomb of charge flows through any cross section of a conductor in 1second the electric current flowing through it is said to be 1ampere.

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A D 5 years, 11 months ago

When 1 columb charger flows in 1 second current is said to be 1 ampere

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Shreya Sharma?? 5 years, 11 months ago

1 ampere is defined as a flow of 1coulomb of charges in per second..

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Why Copper vessels lose their shiny brown surface and gain agreen coat when kept in open. Name the substance present in air with which these metals react? & write the name of the products formed ?

Posted by Kaushik Tj H 5 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Nitish Kumar Sah 5 years, 11 months ago

Copperixide

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Diksha? Gupta 5 years, 11 months ago

Copper oxide is grean layer of copper metal is kwon as corrosion

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Diksha? 5 years, 11 months ago

Copper vessels lose their shine due to the formation of green coating of copper carbonate

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Harman Khattra 5 years, 11 months ago

Product formed is jark

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ANSWER

What is the example of solar energy?

Posted by Rashi Srivastava 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Manvi? Manvi 5 years, 11 months ago

Solar panel

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Dr. Jasmine Kaur ?? 5 years, 11 months ago

Solar cooker

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ANSWER

Eco-what are its components?

Posted by Dinesh Kumar 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Jiya 08 5 years, 11 months ago

Abiotic and biotic things are compinent of ecosystem

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Dr. Shreyas Samarth 5 years, 11 months ago

Environment

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What is the equivalent resistance between the points x and y for the circuits?

Posted by Lakshmi Somu 5 years, 11 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Iupac nomenclature

Posted by Binod Kumar Singh 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Rajat Dubey 5 years, 11 months ago

Write whole question.

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Zeeshan Khan 5 years, 11 months ago

Not understanding what you are asking

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ANSWER

Define one ampere of current

Posted by Natasha Yadav 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

A D 5 years, 11 months ago

When 1 columb charger flows in 1 second current is said to be 1 ampere

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Yogita Ingle 5 years, 11 months ago

The constant current which flowing in two infinetely long straight parallel conductors of negligible circular cross-section, placed in vacuum one metre apart, produces between them a force of 2× 10^-7 N per metre of their length.

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Difference between soaps ? and detergents

Posted by ?‍⚕️?‍⚕️ ?‍⚕️ 5 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Yogita Ingle 5 years, 11 months ago

Soaps :

Soaps are sodium or potassium salts of long chain carboxylic acids.
Soaps have lesser cleansing action or quality as compared to detergents.
Soaps are made from animal or plant fats.
Soaps are more biodegradable.

Detergents :

Detergents are ammonium or solphonate salts of long chain carboxylic acids.
Detergents have better cleansing action as compared to soaps.
Detergents are made from petrochemicals.
Detergents are less biodegradable.

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Miss. 1234 5 years, 11 months ago

Next point mein koi bhi example likh lo??

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Miss. 1234 5 years, 11 months ago

Soaps are effective only in soft water while Detergents are effective in both hard and soft water.

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Miss. 1234 5 years, 11 months ago

Soap is Sodium / Potassium salt of long chain of carboxylic acid while Detergents are ammonium / sulphonate salt of long chain of carboxylic acid

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ANSWER

Why are white blood corpuscle called soldier of the body?

Posted by Aryan Malik 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 11 months ago

White blood corpuscles engulf (phagocytose) the foreign matter (bacteria, dust and other foreign material) entering the body, and are hence called soldiers. They produce anubodies against antigens, and antitoxins against toxins.

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Diksha? 5 years, 11 months ago

Coz they protect the body from pathogens by killing them

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ANSWER

On which side of the periodic table will you find none metal

Posted by ?‍⚕️?‍⚕️ ?‍⚕️ 5 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Santhosh Thegreat 5 years, 11 months ago

Right side

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Arman Brar 5 years, 11 months ago

Right side

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??????? ? 5 years, 11 months ago

Right side

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Miss. 1234 5 years, 11 months ago

Right side

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ANSWER

Ocean thermal energy is due to

Posted by Bikash Prasad 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Aviral Goyal 5 years, 11 months ago

Difference in the temperatures of upper and lower layers of oceans

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Yash Preet 5 years, 11 months ago

Water temperature distance

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ANSWER

How do organisms produce?

Posted by Bikash Toppo 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

?‍⚕️?‍⚕️ ?‍⚕️ 5 years, 11 months ago

There is no separate tissue for reproduction .So they can reproduce by the process of fission or budding

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ANSWER

A battery connected to a resistor supplies a current of 4A. If another resistor of equal resistance is connected in parallel to the first resistor,then the current supplied by the battery will be (1) 12A (2) 1A (3)2A (4)8A

Posted by Arpit Ujjain 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 11 months ago

suppose the emf/voltage of the battery is V and the resistance connected to it is R

so from V=IR. V=4R

now when another resistor of equal resistance is connected in parallel to the first one the effective resistance becomes R/2

voltage is still V let the new current now be i

so V=iR/2

as V=4R

iR/2=4R

i=8 A

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ANSWER

Reproduction is linked to stability of population of a species . Justify the statement.

Posted by Monika Kumari 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 11 months ago

Populations of organisms with well defined places in the ecosystem use their ability to reproduce. The consistency of DNA copying during reproduction is important for the maintenance of the body design features that allow the organism to use the particular niche. Reproduction is therefore linked to the stability of population of species.

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ANSWER

State the principle behind electric generator.

Posted by ???? ? 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 11 months ago

In an electric generator mechanical energy is used to rotate a conductor in a magnetic field to produce electricity.
Fleming’s right hand rule is used where motion and magnetic field is given and the current is induced.

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Madhavi Nakum 5 years, 11 months ago

Electric generator works on the principal of EMI. When a coil is placed in a magnetic field and it rotates by feeling force then induced current is produced...

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ANSWER

What what is placenta

Posted by Nishant Jaiswal 5 years, 11 months ago

CBSE > Class 10 > Science

1 answers

Madhavi Nakum 5 years, 11 months ago

A disc like tissue embedded in the uterus and connected to the uterine wall.It increases the surface area for the absorption of oxygen and nutrients from mother's blood.

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ANSWER

How does chemical coordination occur in plants

Posted by Om Prakash 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 11 months ago

Chemical coordination in plants are occurred in plants with the help of fluids secreted in plants known as phytohormones or plant hormones. These hormones regulate the growth of the plants. For example auxin responsible for the growth of the plants and the Cytokinin helps in cell division in the fast growing part of the plant such as plant hormones.

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Dr. Shreyas Samarth 5 years, 11 months ago

By hormones

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ANSWER

What is the carbon and it's compound

Posted by Surendra Pratap Singh 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 11 months ago

Two or more elements combine to form compound. There are two types of compounds- Organic Compound and Inorganic Compounds. Organic compounds are the one which are made up of carbon and hydrogen.

The bond formed by sharing a pair of electrons between two atoms are known as Covalent Bond. Carbon forms covalent bond. Carbon exists in two forms- as free state and as combined state. Free form of carbon is found in graphite, diamond and fullerene. In combined state, carbon exists as Carbon-dioxide, Glucose, Sugar etc.

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Arpit Mishra 5 years, 11 months ago

Carbon has the valency 4 do it can make its compound by covlent bond so it has nearly 2 lakh compounds

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ANSWER

Which chemical is used for artificial ripening?

Posted by Shraddha ☺️☺️ 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Shraddha ☺️☺️ 5 years, 11 months ago

Thanks☺

1Thank You

Yogita Ingle 5 years, 11 months ago

Artificial Ripening using ethylene gas

Ethylene is a hormone naturally produced within the fruits and regulates the fruit ripening by initiating and controlling a series of chemical and biochemical activities.

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ANSWER

Write the reaction of lead with heat?????

Posted by Rohit Suthar 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 11 months ago

When lead nitrate [Pb(NO3)2] is heated, it forms lead oxide. The emission of brown fumes is also observed. Thesezbrown fumes are of nitrogen dioxide (NO2).

The reaction that takes place is:

Pb(NO₃)2 + heat → 2PbO + 4NO₂+ O₂

Lead nitrate lead Nitrogen Oxide dioxide

The above reaction is an example of decomposition reaction in which single reactant breaks down to give simpler products.

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⛩️Singh Emperor? (Believe In Study) 5 years, 11 months ago

PbO

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ANSWER

How to calculate solar constant?

Posted by Gautam Garg 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 11 months ago

The amount of energy that normally falls on a unit area of the Earth's atmosphere per second when the Earth is at its mean distance from the Sun is called the Solar Constant. The value of the solar constant is found experimentally to be 1.35 kW m^-2.

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⛩️Singh Emperor? (Believe In Study) 5 years, 11 months ago

By multiplying the total area over which the energy lit with insolation.

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ANSWER

Why is the normal eye unable to focus on an object placed within 10cm from the eye

Posted by Patrick Kennedy 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Anmol Negi 5 years, 11 months ago

Yes this is possibal to see the object placed 10 cm from eye but by doing this we feel some pain or strain on our eye or the object is seen little blur

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Gautam Garg 5 years, 11 months ago

Because near point of eye is 25 cm.

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ANSWER

The ph of a salt used to make testy 4 and crispy pakoras is 14.identify the salt and write the chemical equation for its formation.list its two uses

Posted by Jitu Yadav 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Sanket Arjun 5 years, 11 months ago

Used in making soda acid fire extinguisher

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Shreya ... 5 years, 11 months ago

The salt is sodium bicarbonate, NaHCO3.
reaction= 2NaHCO3----->Na2CO3+H20+CO2
Uses= ◆used in antacids. ◆used in making baking powder.

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ANSWER

What are indicator

Posted by Jitu Yadav 5 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Anmol Negi 5 years, 11 months ago

Indicator is defiend as:- indicator is a dye that changes its colour when put it into acid or an base Indicator tell us wether the substance is acid or an base by change its colour

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Jiya 08 5 years, 11 months ago

Indicators are those. Substances which indicates whether the solution is acidic, basic or neutral It can be artificial(phenolphthalein), natural(litmus) or olfactory indicators(onion)

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Sanket Arjun 5 years, 11 months ago

The indicator is a substance which examined that something is acidic or basic.

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Shreya ... 5 years, 11 months ago

An indicator is a dye that changes colour when it is put into an acid or a base. Ex. Litmus, methyl orange etc.

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ANSWER

What is litmus solution

Posted by Jitu Yadav 5 years, 11 months ago

CBSE > Class 10 > Science

2 answers

Sanket Arjun 5 years, 11 months ago

Litmus solution is a solution of natural indicator

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Shreya ... 5 years, 11 months ago

Litmus is a water-soluble mixture of different dyes extracted from lichens.

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ANSWER

Is toothpaste acidic or alkaline

Posted by Jitu Yadav 5 years, 11 months ago

CBSE > Class 10 > Science

5 answers

Rani Mishra ??? 5 years, 11 months ago

Alkaline

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Ashutosh Kumar Singh 5 years, 11 months ago

Basic

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Shraddha ☺️☺️ 5 years, 11 months ago

Its alkaline

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Sanket Arjun 5 years, 11 months ago

Alkaline

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Shreya ... 5 years, 11 months ago

Alkaline

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ANSWER

Difference between blood and lymph. Write three points.

Posted by Sanket Arjun 5 years, 11 months ago

CBSE > Class 10 > Science

3 answers

Shraddha ☺️☺️ 5 years, 11 months ago

And also, blood has high amount of plasma and protein but in lymph the amount of plasma and protein is less.

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Jiya 08 5 years, 11 months ago

Lymph- yellow/colourless in colour - lack fibronogen - slower than blood Blood - red in colour Carry All type of protein Flow of blood is faster

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Sahil Singh 5 years, 11 months ago

Pta nahi

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ANSWER

What are the main functions of lymph??

Posted by Sanket Arjun 5 years, 11 months ago

CBSE > Class 10 > Science

4 answers

Jiya 08 5 years, 11 months ago

Transport fat.by using lacteal Provide imunity And also it delevers extra cellular fluid back into the blood

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Sahil Singh 5 years, 11 months ago

Kya baat ha full preparation board k liya

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Shreya ... 5 years, 11 months ago

◆Lymph supplies nutrition and oxygen to those parts of the body where blood can't reach. ◆Removes excess tissue fluids. ◆Lymph returns proteins to the blood from the tissue spaces.◆ It also absorbs fats from the intestine.

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Sahil Singh 5 years, 11 months ago

Pta nahi

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ANSWER