CBSE > Class 08 > Science | CBSE Board | Homework Help

Ask questions which are clear, concise and easy to understand.

Ask Question

What is energy

Posted by Jatinder Kumar 5 years, 1 month ago

2 answers

Ritika Bai 5 years, 1 month ago

Energy, in physics, the capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. There are, moreover, heat and work—i.e., energy in the process of transfer from one body to another.

3Thank You

Jatinder Kumar 5 years, 1 month ago

What is energy

2Thank You

ANSWER

Meaning of puberty

Posted by Pydipati Ananyaachyuth 5 years, 1 month ago

CBSE > Class 08 > Science

5 answers

Pragya Bharti 5 years, 1 month ago

The time when some physical changes comes in both girls and boys

1Thank You

Baby Singh 5 years, 1 month ago

The age at which girls and boys become reproductive mature

1Thank You

Shivam Mahaseth 5 years, 1 month ago

A time of adolescence in which body undergoes several changes is called puberty

1Thank You

Nidhi Meena 5 years, 1 month ago

The time period in wgich mind become more understanding or mature

2Thank You

Ritika Bai 5 years, 1 month ago

the time when a child’s body is changing and becoming physically like that of an adult

4Thank You

ANSWER

Posted by Mr.Govind Jatav 5 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Ritika Bai 5 years, 1 month ago

Chemical effect of the electric current: The passage of an electric current through a conducting solution causes chemical reaction. That may cause formation of bubbles of a gas on the electrodes, deposites of metal on electrodes, changes of colour of solutions etc.

2Thank You

Ruchi Patel 5 years, 1 month ago

Explain the chemical effect of electric current

1Thank You

ANSWER

Please give me a long note on Animal cell

Posted by Shreyasi Sharma 5 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Raghuveer Singh Yadav 5 years, 1 month ago

You are rite

0Thank You

ANSWER

Which of the following is not a Rabi crop?1 soyabean 2 wheat 3 peas 4 linseed

Posted by Rashmi Rani Bhoi 5 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Xxx Boy 5 years, 1 month ago

Sir please help

0Thank You

ANSWER

How many nucleus does ovum consists

Posted by Mr. King 5 years, 1 month ago

CBSE > Class 08 > Science

5 answers

Pragya Bharti 5 years, 1 month ago

0Thank You

Jiah Jinan? 5 years, 1 month ago

Just 1

0Thank You

Bhoomika Ananya Prudhivi 5 years, 1 month ago

0Thank You

Shreyasi Sharma 5 years, 1 month ago

Only one

0Thank You

Keshav Pareek 5 years, 1 month ago

Only one

0Thank You

ANSWER

Give two different between a zygote and a foetus

Posted by Tamanna Chhillar 5 years, 1 month ago

CBSE > Class 08 > Science

3 answers

Pragya Bharti 5 years, 1 month ago

Zygote-i.)A zygote is the beginning of the formation of a baby. ii.)A zygote is a single cell. It is smaller than a full stop(.) Foetus-i.)A foetus is a unborn baby in the later stages of development (after 8 weeks till birth) ii.)A foetus is a multicellular cell.The body like(hand,legs,ears,eyes,nose and etc can be identified.) (Hope my answer helps you)??

0Thank You

Soumya Rãñjãñ Khuntia 5 years, 1 month ago

Zygote is the fertilised egg And the foetus is the stage of zygote when all the body parts can be recognised perfectly

0Thank You

Rashi Saharan 5 years, 1 month ago

Zygote ~ Internal stage of development of a baby ~ single cell Foetus ~ final stage of development of a baby ~ multicellular

1Thank You

ANSWER

In which part of the sky can you find venues if it is visible as an evening star

Posted by Atharv Aswale 5 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Shreyasi Sharma 5 years, 1 month ago

In the west part of the sky after sunset...

0Thank You

Samarth Misale 5 years, 1 month ago

Don't know

2Thank You

ANSWER

The process of separating various constituents /frictions of petroleum is known as : a) resourcing b) purification c) refining?

Posted by Pearl ? 5 years, 1 month ago

CBSE > Class 08 > Science

3 answers

Rashi Saharan 5 years, 1 month ago

Refining

0Thank You

Shruti ? 5 years, 1 month ago

Refining

3Thank You

Pearl ? 5 years, 1 month ago

Answer please

0Thank You

ANSWER

with the help of a ray diagrams show where the images will be formed if the object is placed at a) beyond 2F b) between F and 2F.

Posted by Neelesh V 5 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Rukaiya Majid 5 years, 1 month ago

When an object is placed beyond 2f in front of a convex lens , then the image formed is between f and 2f on the other side of the lens , it is real , inverted and smaller than the object

0Thank You

ANSWER

The raw material for making Rayon is :a) wood pulp b) ethane c) ester?

Posted by Pearl ? 5 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Shreyasi Sharma 5 years, 1 month ago

Wood pulp is treated with chemicals to produce rayon...

1Thank You

Shivasree P 5 years, 1 month ago

Wood pulp

3Thank You

ANSWER

What is the importance of sound?

Posted by Pearl ? 5 years, 1 month ago

CBSE > Class 08 > Science

3 answers

Pragya Bharti 5 years, 1 month ago

Sound is very important. Sound is important in many of the ways to talk with anyone,to tell someone something, Means sound is very important see if you are not able to talk tell someone something or the other......(imagine then) I think you are able to understand what I mean to say...?

0Thank You

Shivam Mahaseth 5 years, 1 month ago

Sound is important to understand someone language

0Thank You

Nikam Aryan Savita 5 years, 1 month ago

Sound is important because it engages audiences: it helps deliver information, it increases the production value, it evokes emotional responses, it emphasises what's on the screen and is used to indicate mood.

0Thank You

ANSWER

Write a short note on melamine

Posted by Tasmiya Dhila 5 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Nikam Aryan Savita 5 years, 1 month ago

Melamine, also called cyanuramide or triaminotriazine, a colourless crystalline substance belonging to the family of heterocyclic organic compounds, which are used principally as a starting material for the manufacture of synthetic resins. Melamine is rich in nitrogen, a property that is similar to protein.

0Thank You

ANSWER

Is cell membrane and plasma membrane the same?

Posted by ʑơɧą ʑąყŋąც 5 years, 1 month ago

CBSE > Class 08 > Science

5 answers

Bhoomika Ananya Prudhivi 5 years, 1 month ago

Yeah

0Thank You

Ishita Bhattacharya 5 years, 1 month ago

Yes they are same

0Thank You

Akshita Gupta 5 years, 1 month ago

Yes , they are same.

0Thank You

Raj Raghuvanshi 5 years, 1 month ago

What is *** ratio?

0Thank You

Mohd Zidaan 5 years, 1 month ago

Yes!

1Thank You

ANSWER

Can you store the lemon pickle in an aluminum utensils ? Explain

Posted by Kanha Singh 5 years, 1 month ago

CBSE > Class 08 > Science

3 answers

Akshita Gupta 5 years, 1 month ago

No , as it can spoil pickle

0Thank You

Mohd Zidaan 5 years, 1 month ago

No, as aluminium is a highly reactive metal, it can react with lemon juice and causing the metal leach into it or can destroy the food quality!

0Thank You

Pearl ? 5 years, 1 month ago

The lemon pickle contains acids. Metals like aluminum readily react with acid to liberate hydrogen gas. This can lead to spoiling of the pickle.

0Thank You

ANSWER

What is gravitational force ?

Posted by Shruti ? 5 years, 1 month ago

CBSE > Class 08 > Science

3 answers

Shruti ? 5 years, 1 month ago

Thank you

0Thank You

Shreya Jha 5 years, 1 month ago

It is a type of non contact force which attracts other things towards it . Earth also have it's gravitational force.

1Thank You

Ishneet Kaur 5 years, 1 month ago

Every object in universe exerts a force on every other object. This force is known as gravitational force

2Thank You

ANSWER

What is humus ?

Posted by Pearl ? 5 years, 1 month ago

CBSE > Class 08 > Science

3 answers

Ramu Nishad 5 years ago

Dead and decaying matter of plant and animals

0Thank You

Akshita Gupta 5 years, 1 month ago

The dead remians of plants and animals

0Thank You

Sohan Ts 5 years, 1 month ago

The dead and decaying

1Thank You

ANSWER

What is an Earthquake?

Posted by Pearl ? 5 years, 1 month ago

CBSE > Class 08 > Science

4 answers

Pydipati Ananyaachyuth 5 years, 1 month ago

Earthquake is a sudden shaking of Earth it is caused by tectonic plates of Earth

0Thank You

Samarth Misale 5 years, 1 month ago

Earthquake is a sudden shaking of the earth ??

0Thank You

Shreya Jha 5 years, 1 month ago

Earthquake is a sudden shaking or trembling on earth surface due to tectonic plates collission this can also happen because of volcanic eruptions, meteor strikes earth, etc.

0Thank You

Latha M S 5 years, 1 month ago

Earthquake is a shock or series of shocks or tremors due to a sudden movement of crustal rocks generated within the crust or mantel

1Thank You

ANSWER

How can blind people read?

Posted by Sana Ansari 5 years, 1 month ago

CBSE > Class 08 > Science

5 answers

Shreyasi Sharma 5 years, 1 month ago

By braille system invented by Louis Braille.....

0Thank You

Shivam Mahaseth 5 years, 1 month ago

They have a special book and the words are out ward so they recognise by touching it

0Thank You

Om Subham Seth Seth 5 years, 1 month ago

By braille systeam

0Thank You

Samiksha Sawant 5 years, 1 month ago

Through Braille System

1Thank You

Raj Chaturvedi 5 years, 1 month ago

I don't know

0Thank You

ANSWER

What is mean by luminous and non luminous flame

Posted by Ashish Singh 5 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Om Subham Seth Seth 5 years, 1 month ago

Luminous : the object which emits there own light Non luminous : the object which shines by the other reflection Example is the moon is non luminous and sun is luminous

1Thank You

Samiksha Sawant 5 years, 1 month ago

Luminous : the object which emits there own light Non luminous : the object which shines by the other reflection Example is the moon is non luminous and sun is luminous

1Thank You

ANSWER

Match the following Closed path - good conductor LED. - defection of compass Carbon rod. - positively charged iron Galvanisation- poor conductor of electricity Didtilled water - caoting with zinc Salt solution - electrodes Cation - light emitting diodes Magnetic effect of current - electric circuit Chromium - negatively charged ion Anion - electropleting

Posted by Krinaaa Nayak 5 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Shital Karwa 4 years, 10 months ago

don't know

2Thank You

ANSWER

What is thermoset plastic?

Posted by Tanya Rajput 5 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Abhinav Anand 5 years, 1 month ago

Thermosetting plastic is plastic which melts when heated.I love you, from Abhinav❤

1Thank You

ANSWER

What is prokarotic and eukarotic?

Posted by Tanya Rajput 5 years, 1 month ago

CBSE > Class 08 > Science

3 answers

Tanya Rajput 5 years, 1 month ago

Maine question ke answer ke liye thanks bola tah last ma jo tune likha tah uo toh padha he nhi tah varne thanks nhi kahti samje brother

0Thank You

Tanya Rajput 5 years, 1 month ago

Thanks

3Thank You

Abhinav Anand 5 years, 1 month ago

Prokaryote - organisms which contains prokaryotic cells are called prokaryotes Eukaryote- organisms which contains eukaryotic cells . Prokaryotic cell- cell which have nucleas without nucleas membrane Eukaryotic cell- cell which have proper order of nucleas with nucleas membrane Love you from Abhinav❤

3Thank You

ANSWER

What are the common source of noise pollution ? what are their harmful effects?

Posted by Ishita Ishita 5 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Tanya Rajput 5 years, 1 month ago

Traffic, unpleasant song, machine are the common source of noise pollution. It cause health disorder , hypertension, anxiety etc.

2Thank You

Kuldeep Barot 5 years, 1 month ago

Kuldeep

2Thank You

ANSWER

Shrillness of a sound is determined by the ___________of vibration.

Posted by Swara Dekate 5 years, 1 month ago

CBSE > Class 08 > Science

5 answers

Dev Dabas 5 years, 1 month ago

frequency

0Thank You

Shivam Mahaseth 5 years, 1 month ago

Frequency

1Thank You

Samiksha Sawant 5 years, 1 month ago

Pitch

0Thank You

Kinjal Shah 5 years, 1 month ago

Frequency

1Thank You

Tanya Rajput 5 years, 1 month ago

Frequency

0Thank You

ANSWER

What is the defination of terylene ?

Posted by Anshu Rani 5 years, 1 month ago

CBSE > Class 08 > Science

2 answers

Tanya Rajput 5 years, 1 month ago

Tereylen is popular polyester. It can be drawn into fine dress that can be woven like yarn.

0Thank You

Shivansh Yadav 5 years, 1 month ago

What is Adobe phoneshop ? Describe any two features of Adobe photoshop

0Thank You

ANSWER

Cholera is caused by -------------

Posted by Mariyam Sameena 5 years, 1 month ago

CBSE > Class 08 > Science

5 answers

Shreya Jha 5 years, 1 month ago

It is a water borne disease cause by dirty water.

0Thank You

Samiksha Sawant 5 years, 1 month ago

Due to water pollution

0Thank You

Tanya Rajput 5 years, 1 month ago

Bacteria

0Thank You

Pydipati Ananyaachyuth 5 years, 1 month ago

Cholerae bacteria

0Thank You

Sachin Kumar 5 years, 1 month ago

Bacteria

0Thank You

ANSWER

Give a brief summary of Ch Sound

Posted by Manya ? 5 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Shreya Jha 5 years, 1 month ago

Ch Sound in class 8 talks about sound is produced by vibration and in humans by larynx the vocal cords vibrates and sound is produced. Then next sound needs medium to propagate or move that is liquid, solid, gas. It propagate fastest in solids and slowest in gases and cannot propagate or move in vaccum. Then it talks about infrasonic and ultrasonic waves. That infrasonic Waves are less than 20Hertz and ultrasonic waves are more than 20,000 Hertz. Human ear can hear through 20Hertz-20,000 Hertz.The stricture of Human ear consists of outer ear pinna , middle ear stirrup, hammer, anvil (three bones of ear) , inner ear cochlea.

1Thank You

ANSWER

Distinguish between inexhaustible natural resources and exhaustible natural resources on the basis of following parameters: (i) availability (ii) effe ts of human activities.

Posted by Manya ? 5 years, 1 month ago

CBSE > Class 08 > Science

1 answers

Diksha Laniya 5 years, 1 month ago

Answer. Answer: *inexhaustible* these resources are present in unlimited quantity in nature and are not likely to be exhausted by human activities. ... * Exhaustible* these resources are present in limited quantity in nature and are likely to be exhausted by human activities over a certain period of time.

3Thank You

ANSWER

Is law of reflection is in all types of reflection

Posted by Sarang Laiju 5 years, 1 month ago

CBSE > Class 08 > Science