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

We can classify on the basis on their properties. - physical change = reversible change or no new substance formed. - chemical change = irrversible change or new substance formed.

0Thank You

ANSWER

Find which would weight more,2 mole of CaCO3 or 10 mole of H2O

Posted by Sangeeta J 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Animesh Sameer 7 years, 1 month ago

2 mole of CaCo3

2Thank You

ANSWER

Whose girl have largest breast in world ? How to make a sperm out ?

Posted by Divesh Sharma 5 years, 11 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Two bodies having mass m and M resp. Placed near each other at a distance . The gravitational force acting on this body is 200N . Then their position changed . Now the force is 400N. Find distance

Posted by Shubham Mahapatra 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sk Kumar 7 years, 1 month ago

Distance becomes half

0Thank You

ANSWER

Explain Gold Foil experiment?

Posted by Rinki Barnwal 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Harsh Thapar Thapar 7 years, 1 month ago

Rutherford's experiment = - alpha particle pass straight to gold foil. - some of alpha particles move to small angles and some to large angles. - some aplha particle rebonding on striking the gold foil

1Thank You

ANSWER

What are congenital diseee?

Posted by Avi Kapoor 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

Congenital diseases:These diseases are present since birth.They are caused due to genetic abnormality or due to metabolic disorders or malfunctioning of any order.

3Thank You

ANSWER

Trees take oxygen at night and give carbon dioxide the birds sleep on the tree so why they don't die

Posted by Arsh Pathan 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Arsh Pathan 7 years, 1 month ago

Tu cylinder bechta hai birds ko K shanmukh

0Thank You

K Shanmukh 7 years, 1 month ago

Because birds already have oxygen cylinders with them.

1Thank You

ANSWER

What is water vascular system

Posted by Ajay Kumar Singh 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Anchal Mishra 7 years, 1 month ago

Xylem- which conducts water in plants

1Thank You

ANSWER

Is sound have weight

Posted by Rudra Thonte 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Anchal Mishra 7 years, 1 month ago

0Thank You

ANSWER

What is a compond

Posted by Swastik Ghosh 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Chidambaram Rathna 7 years, 1 month ago

A compound is a substance composed of 2 or more different types of elements, chemically combined in a fixed proportion.

0Thank You

Gopal Paladi 7 years, 1 month ago

When two or more elements chemically combined then we call it compound

0Thank You

Yogita Ingle 7 years, 1 month ago

When two or more elements chemically combine in a fixed ratio by mass, the obtained product is known as a compound. Compounds can be defined as substances consisting of 2 or more different types of elements in a fixed ratio of its atoms. When the elements combine, some of the individual property of the elements is lost and the newly formed compound has new properties.

0Thank You

ANSWER

What is the fullform of sonar

Posted by Dilip Singh 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

K Shanmukh 7 years, 1 month ago

100 sonar ki 1 lohar ki

0Thank You

Sneha Yadav 5 years, 11 months ago

Sound Navigation and Ranging?

2Thank You

ANSWER

Rate of change of velocity acceleration

Posted by Surendra Kain 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

Animal tissue defination and type defination

Posted by Sartaj Ansari 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Simarjot Kaur 7 years, 1 month ago

Animal tissue have living cells

0Thank You

ANSWER

How to calculate molecular mass

Posted by Dhanushri Dhanushri 7 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Chidambaram Rathna 7 years, 1 month ago

Example; Molecular mass of HCL Molecular mass=Atomic mass of H + Atomic mass of cl . = 1+35.5u (u=unified mass) =36.5u Molecular mass; Is the sum of atomic masses of all atoms in the molecule.

0Thank You

Dhanushri Dhanushri 7 years, 1 month ago

What is rador and is feature?

0Thank You

Simarjot Kaur 7 years, 1 month ago

It is the sum masses of atoms in a molecule

2Thank You

Ajay Pandey 7 years, 1 month ago

Sum of all the mases of element

2Thank You

Raaj Singh 5 years, 11 months ago

please read the chapter do not waste my and ur time?

3Thank You

ANSWER

What are complex Tissues

Posted by Ansh Solanki09 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Chidambaram Rathna 7 years, 1 month ago

Parenchyma , collenchyma and ssclerenchyma are three types of simple tissues. Xylem and phloem are types of complex tissues.

0Thank You

Simarjot Kaur 7 years, 1 month ago

These tissue made from diff types of cells and its constituents are parenchyma sclerenchyma trachieds and vessels

0Thank You

ANSWER

Can sound travel through vacuum

Posted by Dilip Singh 7 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Rahul Ostwal 7 years, 1 month ago

0Thank You

Durgesh Kumar Singh 7 years, 1 month ago

1Thank You

Avi Kapoor 7 years, 1 month ago

Are you crazy haven't you no? really?

0Thank You

Gaurav Seth 7 years, 1 month ago

No, sound cannot travel in vacuum. Sound requires a medium for its propagation. Large obstacles are required for the reflection of sound waves.

1Thank You

Reema Pandey 7 years, 1 month ago

No sound cannot through vacuum because sound can always travel through the medium in their is no medium and air particles.

1Thank You

ANSWER

Where are protein's and energy synthesized

Posted by Ram Sharma 7 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Durgesh Kumar Singh 7 years, 1 month ago

Energy is realised in mitochondria during respiration

1Thank You

Durgesh Kumar Singh 7 years, 1 month ago

Protein is synthesized in ribosome. Energy is formed in mitochondria.

0Thank You

Jatin Singh Negi 7 years, 1 month ago

Because they use oxygen as a food and give co2 as a product

0Thank You

Ram Sharma 7 years, 1 month ago

Why are mitrochondria power house of the cell

1Thank You

ANSWER

What are the important question in the science chemistry please

Posted by Umesh Lohith 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Durgesh Kumar Singh 7 years, 1 month ago

Chapter 3and 4 see questions

2Thank You

ANSWER

A train starting from rest moves in the acceleration of 0.2m/s for 5.minutes .calculate the final velocity and the distance travelled in his time ?answer

Posted by Umesh Lohith 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Durgesh Kumar Singh 7 years, 1 month ago

Acceleration will be 0.2m/s²....Then v=60m/s. And s=9000m.?️?️?️?️?️

2Thank You

ANSWER

Pleas explain me newton's sceond law

Posted by Tapas Samanta 7 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Sk Kumar 7 years, 1 month ago

The rate of change of momentum is directly proportional to the applied force and moves in the direction in which the force act

0Thank You

Durgesh Kumar Singh 7 years, 1 month ago

Rate of change of momentum is directly proportional to applied unbalanced force.

1Thank You

Navya Chitturi 7 years, 1 month ago

The rate of change in the momentum of a body is directly proposeul to upplied force

1Thank You

Sonu Kumar 7 years, 1 month ago

the rate of change of momentum is dirctly perpotinal to applied unblanced force

1Thank You

ANSWER

What are the gases from which human fart is made of?

Posted by Ansari Khan 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Arsh Pathan 7 years, 1 month ago

Ammonia, nitrate and nitrite gases

1Thank You

Sunita Upadhyay 7 years, 1 month ago

H²O

0Thank You

ANSWER

Describe the structure of neuron.

Posted by Akansha Bhatia 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Dollsi Jain 7 years, 1 month ago

gaurav please tell how u paste these pictures in ans

2Thank You

Gaurav Seth 7 years, 1 month ago

xplain its function.

<hr />

Structure of a neuron

Function: Dendrites of a neuron collect information from the receptors and pass it to the cell body in the form of electrical impulse. From the cell body impulse passes along the axon to its end. At end of the axon, the electrical impulse results in the release of certain chemicals (chemical neurotransmitters). These chemicals cross the gap (synapse) between the endings of the axon and dendrites of the next neuron and start a similar electric impulse in the dendrites. Thus information received travels along the neurons of a nerve to the effector muscles or gland. On reaching to the desired muscle or gland, axon endings from Neuromuscular junction (synapse between axon endings and muscle cells) through which information delivered from neuron to muscles or glands.

1Thank You

ANSWER

Please say me milk is an colodile solution

Posted by Kashif▄︻̷̿┻̿═━一 ?‌?‌?‌?‌?‌?‌ 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Kashif▄︻̷̿┻̿═━一 ?‌?‌?‌?‌?‌?‌ 7 years, 1 month ago

1Thank You

Yogita Ingle 7 years, 1 month ago

Milk is regarded as a mixture and not a pure substance. To be more specific, milk is a colloidal mixture.
In milk, the particles consist of fatty acids, proteins, mineral ions etc in a solvent of water (constituting most of the solvent part).

2Thank You

Shekhar Pandey 7 years, 1 month ago

Yes

3Thank You

ANSWER

Work done by a force is given by equation W=F* costheta * s. Determine and explain the effect of work done due to gradually decreasing angle theta

Posted by Kunjal Kabra 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

The smell of hot sizzling food reaches several meter away but to get the smell of cold food we have to go closer

Posted by Anannya Sarma 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Riya Sharma 7 years, 1 month ago

Since hot sizzling food has temperture higher than cold food and at higher temperture diffusion rate of particles is very fast due to this the smell of hot sizzling food reaches us From serveral metre away& the smell of cold food we have to go closer

2Thank You

Ashish Jaswal 7 years, 1 month ago

It is because the kinetic energy in hot sizzling food is very high thats why it reaches us several metres away where as the cold food have less or least kinetic energy that's why if we have to smell ot we have to go close.

4Thank You

ANSWER

Name two autonomous organelle of cell

Posted by Khush Shaw 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Khushbu Sah 7 years, 1 month ago

Chloroplast and mitochondria

2Thank You

Palak Gambhir 7 years, 1 month ago

Chloroplasts and mitochondria

2Thank You

ANSWER

What is endocytose

Posted by Ansh Jadav 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Dollsi Jain 7 years, 1 month ago

the flexibility of the plasma membrane allows the cell to engulf the food in its surroundings this is known as endocytose

1Thank You

ANSWER

what is dry ice where it is used

Posted by Sakshi Vishnoi 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Palak Gambhir 7 years, 1 month ago

Dry ice is the solid form of carbon dioxide. It is used primarily as a cooling agent. Its advantages include lower temperature than that of water ice and not leaving any residue. The most common use of dry ice is to preserve food, using non-cyclic refrigeration. It is frequently used to package items that must remain cold or frozen, such as ice cream or biological samples.

2Thank You

ANSWER

ರೇಡಿಯೋ ಕಂಡು ಹಿಡಿದ ವಿಜ್ಞಾನಿ ಯಾರು

Posted by Mukesh Oswal 7 years, 1 month ago

CBSE > Class 09 > Science