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Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

Dv/Dx?can you explain how this formula is arrived ?

N.Vishal Rao 5 years, 5 months ago

It's the work done to move a test charge or you can say a point charge from a reference point to another point without producing any acceleration. Dv/DX is it's formula or Kq/r.. where k = 9*10^9.....I hope it may help you

ANSWER

What is the role of sense organs in control and coordination?

Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

CBSE > Class 10 > Science

4 answers

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

but thanks for the reply ?

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

Actually you have tell the role of sense organs in control and coordination

Anil Tharkar 5 years, 5 months ago

Its nervous system

Anil Tharkar 5 years, 5 months ago

Brain

ANSWER

Are allel and trait same ?

Posted by Gautam Iyer 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

Traits are basically your phenotype. They include things like hair color, height, and eye color. Alleles are versions of genes. They are what directly specify what traits you have. For instance, in your hair gene, if you have the allele for brown hair, then you will have brown hair. This is a pretty basic idea of how traits and alleles are related.

ANSWER

Name the sense organs of our body and the receptors associated with them.

Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

CBSE > Class 10 > Science

2 answers

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

thanks Robin... ya it's helpful... but I think skin has thermoreceptor not thigmoreceptor?

Robins Kumar 5 years, 5 months ago

Your answer is just below, Receptor-: Located in sense organ which are specialised tips of nerve cells. 1) Eye - light-Photo receptor 2) Ear - sound-Auditory receptor 3) Nose - smell- Olfactory receptor 4) Tongue - taste- Gustatory receptor 5) Skin - touch-Thigmo receptor I hope so.... It will help you Priya...

ANSWER

Why is a normal eye not able to see clearly the objects placed closer than 25cm?

Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

CBSE > Class 10 > Science

4 answers

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

thnks honey for your answer?

Honey Jain 5 years, 5 months ago

Because our convex len in eye is adjusted to see objects beyond 25 cm

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

ok thanks for your answer??

Disha Macwan 5 years, 5 months ago

Cuz the near point of eye is 25 cm. The lens cant be adjusted to see objects beyond 25 cm without strain

ANSWER

Why does sky appear dark instead of blue to an astronaut?

Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

CBSE > Class 10 > Science

4 answers

Ankita Pal 5 years, 5 months ago

Sky colour seen blue because of reflection of light

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

ok thanx for your answer??

Akshay . 5 years, 5 months ago

Light dispers in medium , space there is no medium (vacum ) on earth where sky appears blue there is medium air and dark light dispers into blue colour

Priyanshu ?✌??? 5 years, 5 months ago

Because there is no atmosphere in the outer space that can scatter the sunlight.

ANSWER

Explain the meanings of malleable and ductile.

Posted by ༄ᶦᶰᵈ᭄༒ツⓋⓘⓝⓔⓔⓣ Ｋｕｍａｒ༒ 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Priyanshu ?✌??? 5 years, 5 months ago

What do you mean by mtlb

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

kya matlab ?

Priyanshu ?✌??? 5 years, 5 months ago

Answer mila

Priyanshu ?✌??? 5 years, 5 months ago

A substance which can be hammer to convert into sheets are said to be malleable . Ductility is the property of being drawn into wire.

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

A substance which can be beaten to convert into sheets are said to be malleable. A substance which can be drawn into wires are said to be ductile.

ANSWER

Give reason : Most metals conduct electricity well.

Posted by ༄ᶦᶰᵈ᭄༒ツⓋⓘⓝⓔⓔⓣ Ｋｕｍａｒ༒ 5 years, 5 months ago

CBSE > Class 10 > Science

3 answers

Aman Gupta 5 years, 5 months ago

As metals are good conductors of heat thus when electrons passes through the metals then the kinetic energy becomes stronger and thus it helps the electrons to move more fastly in the metals and thus metals are known as good conductor of electricity..

Priyanshu ?✌??? 5 years, 5 months ago

Most metal conduct electricity well because electron inside the metal are relatively free to move . So when electricity is pass through metals ,electron carry electricity and spread it all over the metal

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

Metals conduct electricity because they have electrons which are free to move. They offer little resistance to the flow of current. Silver and copper are the best conductors of electricity

ANSWER

Na+O2 —————→→?

Posted by ༄ᶦᶰᵈ᭄༒ツⓋⓘⓝⓔⓔⓣ Ｋｕｍａｒ༒ 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Mukta Srivastava 5 years, 5 months ago

Na2O

Disha Macwan 5 years, 5 months ago

Na2O

Honey Jain 5 years, 5 months ago

Na2o

Priyanshu ?✌??? 5 years, 5 months ago

Na2O

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

NaO2

ANSWER

Why magnesium ribbon be cleaned before burning?

Posted by ༄ᶦᶰᵈ᭄༒ツⓋⓘⓝⓔⓔⓣ Ｋｕｍａｒ༒ 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Aman Gupta 5 years, 5 months ago

In order to make the oxidation process more easily as well as effective.

Robins Kumar 5 years, 5 months ago

?????

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

Nhi apni notebook se copy kiya hai?

Disha Macwan 5 years, 5 months ago

Priya aapne google se copy kiya na?

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

The magnesium ribbon should be cleaned before burning in the air because the layer of magnesium oxide (which is formed due to the reaction of magnesium with air ) can be removed in order to get the desired chemical reaction. Also in order to remove the oxide layer, the presence of which slowdowns the oxidation process. So, by cleaning it, the burning process takes place easily.

ANSWER

Find the nature, position,size of the image and magnification when 2cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 10cm. The distance of the object from the lens is 15cm

Posted by Tuhin Dutta 5 years, 5 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Name Halogen family elements.

Posted by ༄ᶦᶰᵈ᭄༒ツⓋⓘⓝⓔⓔⓣ Ｋｕｍａｒ༒ 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

oh yeah I forgot to mention Astatine ??

Robins Kumar 5 years, 5 months ago

And also someone forgotten to write a last halogen that is Astatine( Z = 85)

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

Most welcome ??

Thanks

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

The halogens are the elements that form group 17 of the periodic table. They are reactive nonmetals and include fluorine, chlorine, bromine, and iodine

ANSWER

why compass north pole attractes earth's north pole?

Posted by Chinmay Rathore 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

hii?

The Earth is a magnet that can interact with other magnets in this way, so the north end of a compass magnet is drawn to align with the Earth's magnetic field. Because the Earth's magnetic North Pole attracts the "north" ends of other magnets, it is technically the "South Pole" of our planet's magnetic field.

Hlo

Because of its magnetic properties. ??

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

ANSWER

‘Animals can respond to stimuli in many different ways, but plants in very limited ways’ Why?

Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

CBSE > Class 10 > Science

3 answers

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

but thnx for the help ?

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

Like us means what we are not animals... ??

Disha Macwan 5 years, 5 months ago

Cuz plants dont have a nervous system like us

ANSWER

Why is blue?

Posted by Honey Jain 5 years, 5 months ago

CBSE > Class 10 > Science

5 answers

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

Sunlight reaches Earth's atmosphere and is scattered in all directions by all the gases and particles in the air. Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.

Honey Jain 5 years, 5 months ago

My question is why sky is blue

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

lol ??

?both hard

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

Did you mean what is blue? ? Blue is a colour ?

3Thank You

ANSWER

How is POP chemically different from gypsum? How can they be interconverted?Write two uses of POP.

Posted by Account Deleted 5 years, 5 months ago

CBSE > Class 10 > Science

2 answers

Omprakash Op 5 years, 5 months ago

It is not 380 k it is 373 k (100°C) because if it is heated above 373k so dead burnt plaster (CaSo4) is formed.

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

Plaster of Paris is calcium sulphate hemihydrate (CaSO4. V2H2O) while gypsum is calcium sulphate dihydrate (CaSO4.2H2O). Gypsum, when heated at a temperature of about 380K, changes to Plaster of Paris. Plaster of Paris, when mixed with water, changes into hard mass called gypsum. Plaster of Paris is used in hospitals for setting fractured bones.It is used for making moulds or casts for toys pottery, ceramics etc.

ANSWER

What is stimulus? Give examples.

Posted by Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

CBSE > Class 10 > Science

3 answers

Priya ✧*｡٩(๑˙╰╯˙๑)و✧*｡ 5 years, 5 months ago

thanks for your answer ??

Yogita Ingle 5 years, 5 months ago

A stimulus is any detectable change in the internal or external environment, capable of eliciting a response in the organism.

Priyanshu ?✌??? 5 years, 5 months ago

Stimulus is anything that stimulates the senses of an organism

ANSWER

Give two examples of synthetic indicators

Posted by Damanpreet Singh 5 years, 5 months ago

CBSE > Class 10 > Science

3 answers

Yogita Ingle 5 years, 5 months ago

Indicators: Indicators are those substances which tell us whether a substance is acidic or basic by change in colour. For e.g., litmus solution.

• Olfactory indicators: Those substances whose odour changes in acidic or basic media are called lfactory indicators. For e.g., clove, vanilla, onion.

• Natural indicators: Turmeric, litmus (obtained from lichen)

• Synthetic indicators: Methyl orange, phenolphthalein.

Neha Kumari 5 years, 5 months ago

Phenophythalein,methyl orange

Priyanshu Roy 5 years, 5 months ago

Brain was divided into which parts

ANSWER

Mcq questions of chapter 1

Posted by Chetan Sirwani 5 years, 5 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

Mcq questions

Posted by Chetan Sirwani 5 years, 5 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What is meaning of Chemistry?

Posted by Vaishu ? 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Gaurav Seth 5 years, 5 months ago

Chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.

ANSWER

What is attires

Posted by Ragini Jha 5 years, 5 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 5 months ago

The process of of dispersing or distributing decision making power to the smaller units is known as Decentralisation.
Taking away the power from the Supreme level and the state level and giving it to the local level is called decentralisation. It once happened in India in the year 1912

Tisha Chhabra 5 years, 5 months ago

What is decentralization

ANSWER

Name the product obtained when common salts solution is electrolysed .mention two uses

Posted by Saba Bano 5 years, 5 months ago

CBSE > Class 10 > Science

3 answers

Saba Bano 4 years, 11 months ago

Thanks

Yogita Ingle 5 years, 5 months ago

The three products of the electrolysis of concentrated sodium chloride solution have important uses in the chemical industry: hydrogen is used as a fuel and for making ammonia. chlorine is used to sterilise water supplies, and to make bleach and hydrochloric acid. sodium hydroxide is used to make soap, paper and bleach.

Samrat Debnath 5 years, 5 months ago

Fygjggbuycvb

ANSWER

What is a generator

Posted by Phani Srikar 5 years, 5 months ago

CBSE > Class 10 > Science

2 answers

Yogita Ingle 5 years, 5 months ago

An electric generator is an electronic appliance that converts mechanical energy into electrical energy. Sources of mechanical energy include steam turbines, gas turbines, wind turbines, and even hand cranks. Electrical generators provide nearly all power that is required for electric power grids.

Nithish Nithish 5 years, 5 months ago

a generator is a device that converts motive power into electrical power for use in an external circuit.

ANSWER

What is prize of new samung galaxy Z Folder

Posted by Md Kaif 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Phani Srikar 5 years, 5 months ago

It may be 500000

ANSWER

Balance the following chemical equations a=HNO3 +Ca(OH)2=Ca(NO3)2+H2O

Posted by Geyin Panggeng 5 years, 5 months ago

CBSE > Class 10 > Science

2 answers

Honey Jain 5 years, 5 months ago

2HNO3+Ca(OH)2=Ca (NO3)2+2H2O

Priyanshi Jadeja 5 years, 5 months ago

2HNO3+Ca(OH)2=Ca (NO3)2+2H2O

ANSWER

What is room temperature?

Posted by Shalini Kumari 5 years, 5 months ago

CBSE > Class 10 > Science

3 answers

Niharika Raj 5 years, 5 months ago

25°C

Priyanshi Jadeja 5 years, 5 months ago

Room temperature is a range of air temperatures that most people prefer for indoor setting which can be comfortable.

Shivam Sharma 5 years, 5 months ago

A comfortable temperature range indoors, usually considered to be 68 to 77(20 to 25c).

3Thank You

ANSWER

Explain earth is treasure of elements

Posted by Mohit Ranpariya 5 years, 5 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 4 months ago

A rare-earth element (REE) or rare-earth metal (REM), as defined by the International Union of Pure and Applied Chemistry, is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides, as well as scandium and yttrium. Scandium and yttrium are considered rare-earth elements because they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties, but have different electronic and magnetic properties. Rarely, a broader definition that includes actinides may be used, since the actinides share some mineralogical, chemical, and physical (especially electron shell configuration) characteristics.

The 17 rare-earth elements are cerium (Ce), dysprosium (Dy), erbium (Er), europium (Eu), gadolinium (Gd), holmium (Ho), lanthanum (La), lutetium (Lu), neodymium (Nd), praseodymium (Pr), promethium (Pm), samarium (Sm), scandium (Sc), terbium (Tb), thulium (Tm), ytterbium (Yb), and yttrium (Y). They are often found in minerals with thorium (Th), and less commonly uranium (U).

Despite their name, rare-earth elements are – with the exception of the radioactive promethium – relatively plentiful in Earth's crust, with cerium being the 25th most abundant element at 68 parts per million, more abundant than copper. However, because of their geochemical properties, rare-earth elements are typically dispersed and not often found concentrated in rare-earth minerals; as a result economically exploitable ore deposits are less common.

ANSWER

One half of a convex lens of focal length 10cm is covered with black paper. Can such lens produced an image of a complete object placed at a distance of 30cm from the lens? Draw a raw diagram to justify your ans

Posted by Vishal Shalu 5 years, 5 months ago

CBSE > Class 10 > Science

2 answers

Thejhasvi Dhanavel 5 years, 5 months ago

A convex lens can produce the complete image of the object even though half of the lens is covered. This is because light coming from the object can be refracted from the other half of the lens. However, the intensity of light will be reduced.