CBSE > Class 09 > Science | CBSE Board | Homework Help

This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

Few rules to keep homework help section safe, clean and informative.

Don't post personal information, mobile numbers and other details.
Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
Ask specific question which are clear and concise.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

1Thank You

ANSWER

ए बैटरी लाइट्स अरे बल्ब डिस्क्राइब द एनर्जी चेंज इंवॉल्वड इन द प्रोसेस

Posted by Adarsh Negi 4 months, 2 weeks ago

CBSE > Class 09 > Science

0 answers

ANSWER

An object mass 20 kg it moving with a velocity of 4 m/s what is the momentum produced

Posted by Prem Kumar 4 months, 2 weeks ago

CBSE > Class 09 > Science

5 answers

Avi Pranjali 4 months, 1 week ago

P = m×v P = 20×4 P = 80

0Thank You

Samraddhi Bihaniya 4 months, 1 week ago

Momentum = Mass × velocity Aq = 20 × 4 = 80

2Thank You

Shashank Shekhar 4 months, 1 week ago

1Thank You

Prem Kumar 4 months, 2 weeks ago

P=20*4=80

2Thank You

Prem Kumar 4 months, 2 weeks ago

Momentum=Mass * Velocity

1Thank You

ANSWER

Naphthalene balls disappear with time without leaving any solid. why

Posted by Harsh Mundada 4 months, 2 weeks ago

CBSE > Class 09 > Science

5 answers

Kafhi Malik 4 months ago

Because it is a volatile solid and it has a tendency to sublime.

0Thank You

Sakshi Tiwari 4 months, 1 week ago

It is because naphthalene balls is a sublime substance

0Thank You

Ambika Sharma 4 months, 1 week ago

Naphthalene balls disappear with time without leaving any solid, because naphthalene balls sublime and directly changes into vapour state without leaving any solid.

0Thank You

Class 9 4 months, 2 weeks ago

Because it have very low boiling point.

1Thank You

Ashmita Mishra 4 months, 2 weeks ago

Because they undergo sublimation. They directly change into solid to gaseous

1Thank You

ANSWER

A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight.

Posted by Kartik Kumar 4 months, 2 weeks ago

CBSE > Class 09 > Science

0 answers

ANSWER

A method of irrigation through lifting water by electricity or diesel

Posted by Ambika Sharma 4 months, 2 weeks ago

CBSE > Class 09 > Science

1 answers

Shashank Shekhar 4 months, 1 week ago

Tubwell

1Thank You

ANSWER

Local name for river lift system

Posted by Ambika Sharma 4 months, 2 weeks ago

CBSE > Class 09 > Science

0 answers

ANSWER

Give reason A gas fills completly the vessels in which its kept

Posted by Mohd Zubair 4 months, 2 weeks ago

CBSE > Class 09 > Science

4 answers

Mounika Ghosh 4 months, 1 week ago

Because gas molecules are loosely packed and have the property of fluidity due to which it completely fills up the vessel

0Thank You

Piyush Lakshay 4 months, 2 weeks ago

Zeabear

0Thank You

Piyush Lakshay 4 months, 2 weeks ago

Skckjgu auditorium id

0Thank You

Raman Sehgal 4 months, 2 weeks ago

Because gas molecules are very loosely packed so they fill the container completely

3Thank You

ANSWER

What mole

Posted by Sanjiv Aswin 4 months, 2 weeks ago

CBSE > Class 09 > Science

2 answers

Ananya Agrawal 4 months, 2 weeks ago

This concept is deleted in updated syllabus this year pls check the syllabus

0Thank You

Other My Family 4 months, 2 weeks ago

The mole is the unit of measurement for amount of substance, a quantity proportional to the number of elementary entities of a substance. It is a base unit in the International System of Units. One mole contains exactly 6.02214076×10²³ elementary entities, which can be atoms,

0Thank You

ANSWER

Name the various components of the blood RBC and WBC

Posted by Pallavi S Pallavi S 4 months, 2 weeks ago

CBSE > Class 09 > Science

2 answers

Abhay Kumar Sethi 4 months, 2 weeks ago

1)RBC- It is responsible for the carrying of oxygen from lungs to different parts of the body and the transport of carbon dioxide back to lungs. 2)WBC- It gives immunity to the body

0Thank You

Sanjiv Aswin 4 months, 2 weeks ago

Certainly! Blood consists of several components, including: 1. **Red Blood Cells (RBCs or erythrocytes):** Responsible for carrying oxygen from the lungs to the rest of the body and transporting carbon dioxide back to the lungs to be exhaled. 2. **White Blood Cells (WBCs or leukocytes):** These cells are part of the immune system and help in fighting infections and diseases. There are different types of WBCs, such as neutrophils, lymphocytes, monocytes, eosinophils, and basophils, each with its specific role in defending the body. These two types of cells are the primary cellular components of blood, along with platelets, plasma, and various proteins, ions, and nutrients essential for bodily functions.

0Thank You

ANSWER

Some questions on mass fraction

Posted by Pratham Shrivastava 4 months, 3 weeks ago

CBSE > Class 09 > Science

3 answers

Ananya Agrawal 4 months, 2 weeks ago

To solve the numerical you can take questions from magnet brain' channel vibhuti khare's video lectures are available and from there you can do in number of questions easily with solutions

0Thank You

Vicky Gaming 1Fan Tanveer 4 months, 2 weeks ago

Matter around us

0Thank You

Chandramohan Chaudhary 4 months, 2 weeks ago

Question ?

1Thank You

ANSWER

Calculate the number of aluminium ions present in 0.051g of aluminium oxide

Posted by Nandini Kushwaha 4 months, 3 weeks ago

CBSE > Class 09 > Science

0 answers

ANSWER

Frequency of 2K hertz and wavelength 35 cm how long will it take to travel 1.5 km

Posted by K P 4 months, 3 weeks ago

CBSE > Class 09 > Science

0 answers

ANSWER

Gases contain large number of tiny particles called -------------

Posted by Mahitha M. K. 4 months, 3 weeks ago

CBSE > Class 09 > Science

1 answers

Sanjiv Aswin 4 months, 2 weeks ago

Gases contain a large number of tiny particles called **molecules** or **atoms**. These particles move freely within the space they occupy, constantly colliding with each other and the walls of their container, giving gases their unique properties.

1Thank You

ANSWER

Don't post personal information, mobile numbers and other details.
Don't use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.
Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.
Ask specific question which are clear and concise.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Posted by Omkar Shinde 4 months, 3 weeks ago

CBSE > Class 09 > Science

0 answers

ANSWER

Properties of a solution, suspension and colloidal

Posted by Gaytri Sharma 4 months, 3 weeks ago

CBSE > Class 09 > Science

1 answers

Diksha Chhukara 4 months, 2 weeks ago

Properties of solution 1. A solution is a homogeneous mixture 2. The particles of solution cannot be even seen with a help of microscope. 3. A true solution does not scatter light Properties of suspension 1. A suspension is a heterogeneous mixture. 2.the size of solute particles are large 3. A suspension scatter a beam of light passing through it Properties of colloidas 1.it is heterogeneous mixture. 2.the size of particles are larger than solution but smaller than suspension. 3. Scatters a beam of light passing through it.

0Thank You

ANSWER

All purpose models of an atom given in the

Posted by Parnika Kanal 4 months, 3 weeks ago

CBSE > Class 09 > Science

3 answers

Diksha Chhukara 4 months, 2 weeks ago

Electron, protons, neutrons

0Thank You

Adarsh Singh 4 months, 3 weeks ago

Electon, proton, and neutron

0Thank You

Aditya Shrivastava 4 months, 3 weeks ago

Name the three sub atomic particles of an atom

3Thank You

ANSWER

State kepler's first law

Posted by Satyam Kumar 4 months, 3 weeks ago

CBSE > Class 09 > Science

2 answers

Ansh Yadav 4 months, 2 weeks ago

The first Kepler law said that planet revolves around the sun in elepthical path and there was distance is equal but one force greater than another forces

0Thank You

Aaliya Jena 4 months, 3 weeks ago

All the planets revolve around the sun in a fixed orbit..

0Thank You

ANSWER

How many reproduction

Posted by Irfan Qureshi 4 months, 4 weeks ago

CBSE > Class 09 > Science