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

When the plant cell absorbs a lot of water, then it doesn't burst due to the rigidity of the cell wall. Due to the swelling up of cell(extreme), it produces a force on the cell wall but the rigid cell wall pushes it back with an equivalent force.

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Krisha Shah 4 years, 6 months ago

It helps to maintain the turgidity of the cell and gives the cell a proper definite shape.

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ANSWER

Newton's second law of motion give us the measure of______

Posted by Karthik Aravind 4 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Mansi Yadav 4 years, 6 months ago

F= ma

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Aditya Thakur 4 years, 6 months ago

F=ma

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Krisha Shah 4 years, 6 months ago

Force F=ma

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Hariom Sirota 4 years, 6 months ago

F-m.a

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ANSWER

If the object has mass of 5kg. Find its weight?

Posted by Karthik Aravind 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Krisha Shah 4 years, 6 months ago

W=mg W=5×9.8 W=59N/ kg m per second

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ANSWER

Define negative work with the example

Posted by Karthik Aravind 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Reena Baghel 4 years, 6 months ago

Negative work is performed if the displacement is opposite to the direction of the force applied Example :- work was done the gravity on a rocket going perpengicular upwards

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ANSWER

Write the dispersed phase and dispersion medium of emulsion

Posted by Karthik Aravind 4 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

How to find valency and molecular mass

Posted by Bharti Rani 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Ayush Sharma 4 years, 6 months ago

The valency can be calcualted by electronic configuration- 1s²,2s²,2p⁶, 3s²,3p⁶,4s²,3d¹⁰,,..... For ex ample in the case of oxygen it has atomic no.-8, So from the above formula(electronic configuration) Oxygen-8(atomic no.) 1s²,2s²,2p⁴ 2,2+4=2,6 Thus ,no. Of eletrons in the last shell is called valency so, 6 is valency

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Krisha Shah 4 years, 6 months ago

The maximum no. Of electrons an element can either gain, loose or share as per its energy is called valence. Molecular mass is simple. It is the mass(atomic mass) of all the molecules of an element .

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Naman Singh 4 years, 6 months ago

Given the valence of two elements, find the least common multiple of the absolute value of the valence. Then divide the least common multiple by the absolute value of the valence to find the number of atoms in the molecule. (2) The oxygen element usually shows -2 valence.29-Jan-2020

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Two balls A and B of masses 40 gram and 50 gram are moving at speed of 40 metre per second and 30 metre per second respectively if after colliding B start moving with a velocity of 25 metre per second what is the velocity of A

Posted by Vansh Jangra 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Hariom Sirota 4 years, 6 months ago

Velocity will be 25 meter per second

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ANSWER

A girl having a mass of 35 kg sits on the trolley of mass 5kg . The trolley is given and initial velocity of 4 metre per second by applying the force . The trolley comes to rest after covering a distance of 16 metre. (a) How much work is done on the trolley ? (b) How much work is done by the girl?

Posted by Arnav Yadav 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Krishna Pal Charan 4 years, 6 months ago

I don't know

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ANSWER

What is the difference between force and weight

Posted by Anushka Chaudhary 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Himanshi Chauhan 4 years, 6 months ago

F=ma and W=mg

1Thank You

Eshaan S 4 years, 6 months ago

I hope this helps you

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Eshaan S 4 years, 6 months ago

Force is any interaction that alters the motion of an object. It is a 'push' or 'pull' action upon an object, resulting from the object's interaction with another object. Weight is the force of gravity, which is the pull of the Earth on an object. The direction of the force of gravity is downwards towards the centre of the Earth. As mentioned earlier when two objects interact they exert equal and opposite forces.

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What is the difference between mass and momentum

Posted by Anushka Chaudhary 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Pravin Kumar 4 years, 6 months ago

Mass :- It is the quantity of matters in our body. It is denoted by m. It didn't vary from place to place. Momentum:- It is the product of mass and velocity.... P=m*a . . PlZz Like

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ANSWER

A girl moves along the boundary of square field of side 20 min in 80 sec.what will be the magnitude of displacement of the end of 200sec ?also Calculate average velocity?

Posted by Deepika Sharma 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Deepika Sharma 4 years, 6 months ago

Questions is right

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Taman Bhatnagar 4 years, 6 months ago

I don't know

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Moksh Yadav 4 years, 6 months ago

Side of square field = 20m Perimeter =20*4=80m Time=80sec Means she complete 1 lap in 80 second, therefore 2 laps in 160 sec then half in 40 seconds... So the displacement is the diagonal of square = root side Average velocity is eaual to total time taken upon total distance travelled = 200/200= 1m/s

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Ranjeet Kumar Pandit?? 4 years, 6 months ago

Yes please type with a correct unit and in fair manner

1Thank You

Vivek Roy 4 years, 6 months ago

Question ❓ is wrong please type carefully on units

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ANSWER

Differences between RBC and WBC

Posted by 9B-19 Meet Vaghela Jnv Rajkot 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Marvel 007 4 years, 6 months ago

Actually your description is not convinent for exam point of view

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Vishal Prajapat 4 years, 6 months ago

What is your name where are you live I live in Chaksu I am khushi

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Marvel 007 4 years, 6 months ago

RBC are those cells which helps to transport the nutrients, oxygen and other important minerals through blood. Whereas WBC protects the body from foreign substances which must be killed like bacteria, pathogens, etc.

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Vishal Prajapat 4 years, 6 months ago

Isme thanks ki kya bat h mujhe Aya to Mene bra diya

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Vishal Prajapat 4 years, 6 months ago

RBC is the nerves which has hemoglobin but WBC is not have hemoglobin

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ANSWER

What is vaporization

Posted by Varsha Sharma 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Varsha Sharma 4 years, 6 months ago

Thanks

1Thank You

Sania . 4 years, 6 months ago

The process in which a liquid change into gaseous state by absorbing heat at constant temperature.

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Purva Ghule 4 years, 6 months ago

Vapourization is a process in which the water boils till its boiling point and then after it gets evaporating in which the vapours are formed. This process is called as vapourization

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ANSWER

1. You are standing on the terrace of your house and suddenly the force ofgravity vanishes. What will happen? 2. Define the term acceleration due to gravity. 3. Is freely falling body a case of uniform motion?

Posted by Santhwana Johnson 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Vivek Roy 4 years, 6 months ago

value ofAcceleration due to gravitywill 9.8m/s"2

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ANSWER

What are the agents causing a force?

Posted by Yuvraj Singh 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Krisha Shah 4 years, 6 months ago

Multiple agents are responsible for a force like mass and acceleration.

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Deepika Sharma 4 years, 6 months ago

No agent can exert a force on an object without being in contact with the object.

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ANSWER

Tissue that form the inner lining of out mouth ..tell ans...plz fast

Posted by Jagannath Kashyap 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Himanshi Chauhan 4 years, 6 months ago

Squamous tissue

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Bharti Yadav 4 years, 6 months ago

Simple squamous epithelial tissue

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Athokpam Abhijeet 4 years, 6 months ago

Simple Squamous

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ANSWER

Explain the process of sublimation

Posted by Prathiksha Shetty 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Sania . 4 years, 6 months ago

Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state for example:- dry ice

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ANSWER

Its magnitude is greater than the distance travelled by the object. This is true or not for displacement and why?

Posted by Anshu Kumari 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Sania . 4 years, 6 months ago

Not true, because if the initial and final position of the object is the same displacement can become zero.This happens when a body is moving in a circular path.

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ANSWER

Which facter contributes to the carbon cycle

Posted by Aprilso Mitti 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Aprilso Mitti 4 years, 6 months ago

A) fossil fuel combustion b) respiration c) photosynthesis d) all of these

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ANSWER

What is motiom

Posted by Raj Barchhav 4 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Abhinit Jha 4 years, 6 months ago

When a stationary body move from one place to another by applying force is called motion

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Ranjeet Kumar Pandit?? 4 years, 6 months ago

When a stationary body move from one place to another by applying force then we can say that the body in motion

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Pranav Saraff 4 years, 6 months ago

Movement of any object from one position to another position with respect to the observer is called as Motion

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Ridhima Ridhima 4 years, 6 months ago

What is the commercial unit of energy and state its equivalent value in joules

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ANSWER

Application and principle of various separation techniqe

Posted by Divya Kumari 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Sivasudan Tanot 4 years, 6 months ago

Separation of Mixtures Not everyone is out searching for gold (and not many of those searchers is going to get much gold, either). In a chemical reaction, it is important to isolate the component(s) of interest from all the other materials so they can be further characterized. Studies of biochemical systems, environmental analysis, pharmaceutical research – these and many other areas of research require reliable separation methods. Here are a number of common separation techniques: Chromatography Chromatography is the separation of a mixture by passing it in solution or suspension or as a vapor (as in gas chromatography) through a medium in which the components move at different rates. Thin-layer chromatography is a special type of chromatography used for separating and identifying mixtures that are or can be colored, especially pigments. Distillation Distillation is an effective method to separate mixtures comprised of two or more pure liquids. Distillation is a purification process where the components of a liquid mixture are vaporized and then condensed and isolated. In simple distillation, a mixture is heated and the most volatile component vaporizes at the lowest temperature. The vapor passes through a cooled tube (a condenser), where it condenses back into its liquid state. The condensate that is collected is called distillate. Figure 2.11 Distillation apparatus. In the Figure above , we see several important pieces of equipment. There is a heat source, a test tube with a one-hole stopper attached to a glass elbow and rubber tubing. The rubber tubing is placed into a collection tube which is submerged in cold water. There are other more complicated assemblies for distillation that can also be used, especially to separate mixtures, which are comprised of pure liquids with boiling points that are close to one another. Evaporation Evaporation is a technique used to separate out homogenous mixtures where there is one or more dissolved solids. This method drives off the liquid components from the solid components. The process typically involves heating the mixture until no more liquid remains, Prior to using this method, the mixture should only contain one liquid component, unless it is not important to isolate the liquid components. This is because all liquid components will evaporate over time. This method is suitable to separate a soluble solid from a liquid. In many parts of the world, table salt is obtained from the evaporation of sea water. The heat for the process comes from the sun. Figure 2.12 Once the sea water in these evaporation ponds has evaporated, the salt can be harvested. Filtration Filtration is a separation method used to separate out pure substances in mixtures comprised of particles some of which are large enough in size to be captured with a porous material. Particle size can vary considerably, given the type of mixture. For instance, stream water is a mixture that contains naturally occurring biological organisms like bacteria, viruses, and protozoans. Some water filters can filter out bacteria, the length of which is on the order of 1 micron. Other mixtures, like soil, have relatively large particle sizes, which can be filtered through something like a coffee filter. Figure 2.13 Filtration.

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ANSWER

What is meant by pure substance?

Posted by M.S.Mukesh Kumar 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Pranav Saraff 4 years, 6 months ago

A substance that has a fixed chemical composition throughout is called a pure substance

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Kaushal Thakur 4 years, 6 months ago

Substance which are made up of same type of particles that is called pure substance

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Rishi Raj 4 years, 6 months ago

A pure substance is one which is made up of one kind of particle (Atoms and molecules)

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Anand Yadav 4 years, 6 months ago

A pure substance is one which is made up of one kind of particle (Atoms and molecules)

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Nitish Yadav 4 years, 6 months ago

Substances which are made up of same kind of particles are known as pure substances

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ANSWER

Mera 1 March ko science ka final examination ha me Kya kru bhot dar lag rha ha. Bro please give me answer. ????

Posted by Kartik Kumar 4 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Ankit Yadav 4 years, 6 months ago

Do it

1Thank You

Marvel 007 4 years, 6 months ago

Just have confidence and then do it.??

1Thank You

Vishal Prajapat 4 years, 6 months ago

Don't worry did not take any tention in your mind and study at a fresh mind ok and make own notes

1Thank You

Samaira Mehta 4 years, 6 months ago

Stay calm ? and prepare for it

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ANSWER

Give the names of the elements present in the following compounds: A. Quick line B. Hydrogen Bromide C. Baking soda D. Potassium Sulphate

Posted by Harpreet Kaur 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Kartik Kumar 4 years, 6 months ago

A. Calcium and Carbon (CO³) B. Hydrogen and Bromine C. Sodium and Hydrogen and Carbon CO⁴ D. Potassium and Sulphur (SO⁴)

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Hemang Mittal 4 years, 6 months ago

A. Calcium and Carbon (CO³) B. Hydrogen and Bromine C. Sodium and Hydrogen and Carbon CO⁴ D. Potassium and Sulphur (SO⁴)

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ANSWER

What are anode ray

Posted by Sudhanshu Tiwari 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Himanshi Chauhan 4 years, 6 months ago

Positively charged rays

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Shreeja Sasi 4 years, 6 months ago

An anode ray is a beam of positive ions that is created by certain types of gas discharge tubes

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ANSWER

What are cathode ray

Posted by Sudhanshu Tiwari 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Kashish Chauhan 4 years, 6 months ago

a beam of electrons emitted from the cathode of a high-vacuum tube.

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ANSWER

What is the function of nerve impulse

Posted by Aham Raj 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Tanya Saini 4 years, 6 months ago

The function of nerve impulses is to transport blood to different parts of the body.

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ANSWER

Difference Between metal and non metal.

Posted by Dhruv Shrivastava 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Trisha Kumari 4 years, 6 months ago

And metal are good conductor of electricity and heat but non metal are not good conductor of electricity and heat

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Rishi Raj 4 years, 6 months ago

Metal- ☆Malleable ☆Ductile ☆Good conductor of heat and electricity ☆e.g. copper, silver, gold etc Non-metal- ☆Non-malleable ☆ Non-Ductile ☆Bad conductor of heat and electricity ☆e.g. Oxygen, hydrogen, nitrogen etc

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Trisha Kumari 4 years, 6 months ago

Metal are lustre but non metal are not lustre

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ANSWER

Explain unit mass

Posted by Purbanhi Mitra 4 years, 6 months ago

CBSE > Class 09 > Science