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

The United Nations International Children's Emergency Fund (UNICEF) was created by the United Nations in 1946 to provide food, clothing, and healthcare to the children of post-World War II Europe. In 1953, UNICEF became a permanent part of the United Nations. While its name was shortened to United Nations Children Fund at that time, it is still is referred to as UNICEF.

0Thank You

Sairaj Patil 6 years ago

United Uations International Children's Emergency Fund

2Thank You

ANSWER

A small electric lamp is placed at focus of a convex lens when the lamp is switched on the lens will produce

Posted by Anjana Thakur 6 years ago

CBSE > Class 10 > Science

1 answers

Abhishek Ahir 6 years ago

Rays of small lamp rays passed through the lens after this ray parallels to principal axics

0Thank You

ANSWER

What is skeleton equation???

Posted by Priyanshu Sharma 6 years ago

CBSE > Class 10 > Science

3 answers

Shalu Kumari 6 years ago

Achemical equation expressed a symbol and formulae such that number of atoms of defferent element in reactant and product sides are unequal is called skeletal equation

0Thank You

Tunni Kumari 6 years ago

The unbalanced equation is called as skeleton equation

0Thank You

? ... 6 years ago

It is unbalanced equation.

2Thank You

ANSWER

What is focus length

Posted by Priyanshi Rana 6 years ago

CBSE > Class 10 > Science

5 answers

Alok Ojha 6 years ago

The distance between pole and focus on the principle axis is called focal length

0Thank You

Tunni Kumari 6 years ago

Distance between pole and the focus is called focal length

0Thank You

? ... 6 years ago

The distance between the pole and focus is called focal length

2Thank You

Secret Girl...? 6 years ago

Length *

1Thank You

Secret Girl...? 6 years ago

It's focal *lenth

0Thank You

ANSWER

Full form of LUCK and AIDS

Posted by Bheemu Ani 6 years ago

CBSE > Class 10 > Science

1 answers

Aryan Chandra 6 years ago

AIDS- Aquired Immuno Deficiency Syndrome

3Thank You

ANSWER

Define electron ?

Posted by ? ... 6 years ago

CBSE > Class 10 > Science

5 answers

Alok Ojha 6 years ago

Electron is an negatively charged particle which revolve around the nucleus in the atom

1Thank You

Priyanshu Kumar ????? 6 years ago

It is an elementary particle which has negative charge and it revolve around the nucleus ???

2Thank You

Tunni Kumari 6 years ago

Negatively charged particle of an atom

1Thank You

Secret Girl...? 6 years ago

Ryt aadya

2Thank You

Aadya Singh ? 6 years ago

It is a negatively charged particles...

4Thank You

ANSWER

Who is the first person in the world

Posted by Mr . Naved Siddiqui 6 years ago

CBSE > Class 10 > Science

1 answers

Tunni Kumari 6 years ago

Homosapiens

0Thank You

ANSWER

Draw the isomers of butane , C4H10.

Posted by ❤ Suhani ❤ 6 years ago

CBSE > Class 10 > Science

5 answers

Alok Ojha 6 years ago

Ch3-ch-ch3-ch3

0Thank You

Aadya Singh ? 6 years ago

2Thank You

❤ Suhani ❤ 6 years ago

Its ok @ashish raushan....

0Thank You

𝕽𝖆𝖚𝖘𝖍𝖆𝖓 委 6 years ago

Not an idea about how to share the image Can have another way to recive the image or ans

2Thank You

Bheemu Ani 6 years ago

CH4-CH3-CH3-CH3

1Thank You

ANSWER

Under what condition permanent electromagnet is obtained if a current carrying solenoid is used

Posted by Ankit Sharma 6 years ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 10 months ago

The conditions required to obtain permanent electromagnet when a current carrying solenoid is used are:

● The rod inside solenoid should be made of a magnetic material like steel, soft iron etc. This type of material can retain the magnetic properties for a long time after magnetization.

● Direct current should be used for solenoid.

● The turns should be closely packed and large in number for producing a uniform strong magnetic field

0Thank You

ANSWER

What is foxal length

Posted by News Tv 58 Prime 6 years ago

CBSE > Class 10 > Science

2 answers

Lucifer ? Morningstar? 6 years ago

The length from the optical centre to focus is known as focal length.

1Thank You

Diksha ? 6 years ago

The distance between the focus (F) and pole( P) is called focal length...

1Thank You

ANSWER

Write the name which is liquid at room temperature is non metal ?

Posted by Agrim Jain 6 years ago

CBSE > Class 10 > Science

2 answers

Diksha ? 6 years ago

Bromine ( Br)

0Thank You

Lucifer ? Morningstar? 6 years ago

Bromine

1Thank You

ANSWER

Character sketch of lomov

Posted by Mahima Yadav 6 years ago

CBSE > Class 10 > Science

0 answers

ANSWER

What do u mean by drift speed?

Posted by Lucifer ? Morningstar? 6 years ago

CBSE > Class 10 > Science

1 answers

Lucifer ? Morningstar? 5 years, 6 months ago

<font color=light pink> what's ur name

0Thank You

ANSWER

How can we see the sun for few minutes even after it has actually rises.?

Posted by Lucifer ? Morningstar? 6 years ago

CBSE > Class 10 > Science

1 answers

Gaurav Kandpal 6 years ago

Due to atmospheric refrection

1Thank You

ANSWER

Why are metal reducing agent where as non metal are oxidising agent

Posted by Deepanshu Gupta 6 years ago

CBSE > Class 10 > Science

1 answers

Bheemu Ani 6 years ago

Because metals are electro positive means thy are electron dinners. Non metals are electro negative measurement thy are electron Esepters.

0Thank You

ANSWER

Differentiate b/w oxygenated blood and deoxygenated blood.

Posted by . Ansari 6 years ago

CBSE > Class 10 > Science

1 answers

Lucifer ? Morningstar? 6 years ago

The blood which carry oxygen is known as oxygenated blood. The blood which carry carbon dioxide is known as deoxygenated blood.

1Thank You

ANSWER

Grand trunk road

Posted by Purnendu Pati 6 years ago

CBSE > Class 10 > Science

1 answers

❤ Suhani ❤ 6 years ago

Sher shah suri marg... Is also known as grand trunk road (gtr) The national highway no.1

0Thank You

ANSWER

What is Speciation? 5 marks

Posted by Nainil Jariwala 6 years ago

CBSE > Class 10 > Science

1 answers

Lucifer ? Morningstar? 6 years ago

Speciation, the formation of new and distinct species in the course of evolution. Speciation involves the splitting of a single evolutionary lineage into two or more genetically independent lineages

0Thank You

ANSWER

What is the cromozon

Posted by Manmohan Yadav 6 years ago

CBSE > Class 10 > Science

4 answers

Niharika Sharma 6 years ago

Chromosome are the thread like structures which contains information of our heridetary genes

0Thank You

Yogita Ingle 6 years ago

A chromosome is an organized structure of DNA and protein found in the nucleus of cells. It is a single piece of coiled DNA containing many genes. These are considered to be the vehicles of heredity as they carry genes. Genes are small points on the chromosome responsible for one character of an individual.

1Thank You

Priyanshu Keshri 6 years ago

It is a thread like structur inside the cell

1Thank You

Aadya Singh ? 6 years ago

Chromosome is a thread like structure in the nucleus of a cell formed of DNA which carries the genes...

5Thank You

ANSWER

Which one of the following types of medicines is used for treating indigestion?

Posted by Vimlesh Kumari 6 years ago

CBSE > Class 10 > Science

3 answers

Diksha ? 6 years ago

Antacids like milk of magnasia

0Thank You

Yogita Ingle 6 years ago

The indigestion is due to excess of acid produced in the stomach. The medicine used to neutralise it is called antacid

1Thank You

Aadya Singh ? 6 years ago

Antacids..

5Thank You

ANSWER

Formula of resistivity

Posted by Rahul Sharma 6 years ago

CBSE > Class 10 > Science

3 answers

Nainil Jariwala 6 years ago

Rho= Resistance.Area/Length

0Thank You

Yogita Ingle 6 years ago

Resistivity or specific resistance is resistance of a conducting material of unit length and having unit area of cross section. It is a property of material and depends on nature of material.
SI unit is Ohm-m (Ω.m)

0Thank You

Aadya Singh ? 6 years ago

Resistivity = Resistance× length/area..

3Thank You

ANSWER

How to name an organic compound

Posted by Niyathi Shine 6 years ago

CBSE > Class 10 > Science

3 answers

Nainil Jariwala 6 years ago

By nomenclature

0Thank You

Rishabh Singh 6 years ago

According to its no.of bonds and functional group and no. Of carbon on which the functional group has been used

0Thank You

Yogita Ingle 6 years ago

Prefix (alphabetically) root word (alk) primary suffix (ene, yne) secondary suffix (main functional group)

So IUPAC name of any organic compounds essentially consists of two or three parts.

(i) Root word (ii) Suffix (iii) Prefix

(i) Root Words

The basic unit is a series of root words which indicate linear or continuous chains of carbon atoms. Chains containing one to four carbon atoms are known by special root words while chains from C5 onwards are known by Greek number roots.

<div>

Chain Length	Root word	Chain Length	Root word
C1	Meth-	C11	Undec-
C2	Eth-	C12	Dodec-
C2	Prop-	C13	Tridec-
C4	But-	C14	Tetradec-
C5	Pent-	C15	Pentadec-
C6	Hex-	C16	Hexadec-
C7	Hept-	C20	Eicos-
C8	Oct-	C30	Triacont-
C9	Non-	C40	Tetracont-
C10	Dec-	C50	Pentacont-

</div>

In general, the root word for any carbon chain in alk-.

(ii) Primary Suffix

Primary suffix are added to the root words to show saturation or unsaturation in a carbon chain.

<div>

Nature of carbon chain	Primary suffix	Generic name
Saturated (C – C)	-ane	Alkane
Unsaturated (C = C) with one double bond	-ene	Alkene
Unsaturated (C º C) with one triple bond	-yne	Alkyne
Unsaturated with two C = C bonds	-diene	Akladiene
Unsaturated with two C º C bonds	-diyne	Alkadiyne
Unsaturated with three C = C bonds	-triene	Alkatriene

</div>

(iii) Secondary Suffixes

Suffixes added after the primary suffix to indicate the presence of a particular functional group in the carbon chain are known as secondary suffixes.

<div>

Functional Group	Secondary suffix
Alcohol (-OH)	-ol
Aldehyde (-CHO)	-al
Ketone (>CO)	-one-
Carboxylic acid (-COOH)	-oic acid
Sulphonic (-SO3H)	-sulphonic acid
Amine (-NH2)	-amine
Thioalcohol (-SH)	-thiol
Cyanide (-CN)	-nitrile
Ester (-COOR)	-oate
Amide (-CONH2)	-amide
Acid halide (-COX)	-oyl halide

</div>

3Thank You

ANSWER

Difference between electrical energy and electric power

Posted by Rahul Sharma 6 years ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 6 years ago

Sr.no	Energy	Power
1.	Energy is defined as the capacity to do some work. It is power which is integrated over time.	Power is defined as the rate at which a specific work is done, or which the energy is transmitted.
2.	The unit used to measure energy is joules or watt-seconds	The unit used to measure this is watt or joules per second
3.	‘W’ is the symbol which denotes energy	The symbol used to denote power is P.
4.	Energy changes from one form to another	Power cannot be transformed from one type to another
5.	Energy is a time quantity or component	It is an instantaneous quantity
6.	Various types of energy are kinetic, thermal, potential, gravitational, sound, electromagnetic, light, elastic, etc	Different kinds of power are electric power, optical power, human power, etc.
7.	Energy is known to be stored which can be used in future	Power quantity is not storable or cannot be stored