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

yes it is possible a body velocity can zero an acceleration is constant but it will be negative will be negative because when we throw a ball at a point the ball will stop and that time The velocity is zero but the acceleration of the gravity of the earth will be always negative and it will be 9.8 Newton

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Madhur Sahay 4 years, 6 months ago

a) not possible. Acceleration is v/t. So if v=0 , then acceleration is also 0 b) This is possible in circular motion where velocity is perpendicular to acceleration. c) Every object starts from 0 and accelerates to a particular speed remaining it at constant

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ANSWER

What is balanced and unbalanced force ?

Posted by Pratik Kanungo 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Fear Fighter 4 years, 6 months ago

A equation is said to be balanced if there are an equal no. Of atoms of elements in both sides of reactants and product. While unbalanced equation has an unequal no. Of atoms of elements in reactants and products

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what is deposation

Posted by V Das Das 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

Changing of gas into solid it is also known as sublimation

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What is metamorphosis ?

Posted by Khushi Singh 4 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Jiten Singh 4 years, 6 months ago

Changing the shape of oviparous organisms are called metamorphosis

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Yogita Ingle 4 years, 6 months ago

The transformation of the larva into adult through drastic changes is called metamorphosis. Frogs and insects are examples of organisms showing metamorphosis.

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Aditya Kumar 4 years, 6 months ago

Wrong

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Subhankar Patra 4 years, 6 months ago

The sudden change in the body structure of an organism in its developing days is known as metamorphosis. Ex-tadepole to adult frog

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ANSWER

Why are we able to sip hot tea or milk faster from a sacurer rather than a cup?

Posted by Rakesh Pandey 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Tarushi Jaipuria 4 years, 6 months ago

We are able to sip hot tea or milk faster from a saucer rather than a cup because a saucer has increased surface area than a cup . Since as the surface area increases , the rate of evaporation also increases. So we are able to easily sip our tea faster in saucer.

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ANSWER

Convert 300 kelvin into celsius

Posted by Priyanshu Keshari 4 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Prabhat Garg 4 years, 6 months ago

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Rakesh Pandey 4 years, 6 months ago

300k-273k=27degree celcius

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Jay Kishan 4 years, 6 months ago

0 degree celsius equal to 273k

300k-273k=27degree celsius

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Pratham Narang 4 years, 6 months ago

300°C

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ANSWER

What is Matter ?

Posted by Palak Shahi 4 years, 6 months ago

CBSE > Class 09 > Science

6 answers

Hari Shankar Shekhar 4 years, 6 months ago

Anything which is made up of particle is known as matter and Mattar will occupy space volume and and some of the matter has fixed shape and some did not it is according to the state of matter

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Jiten Singh 4 years, 6 months ago

Any materials which has weight and contains space are called matter

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Palak Burman 4 years, 6 months ago

It is the substance which have mass and occupies space.

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Prabhat Garg 4 years, 6 months ago

Any thing which is made up of particles is known as matter.

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Rakesh Pandey 4 years, 6 months ago

Any thing that has mass and occupy space is called matter

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Priyanshu Keshari 4 years, 6 months ago

Any thing that has mass and occupies space is m atter

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ANSWER

Explain why the temperature remains constant during interconversion of state of matter

Posted by Raman Sandhu 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Eram Naaz 4 years, 6 months ago

what is distimination

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Yogita Ingle 4 years, 6 months ago

The temperature remains constant because the heat produced gets used up in changing the state of matter by overcoming the forces of attraction present between the particles.

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Why we can not see the sun light at night

Posted by Ranjan Kumar 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Jiten Singh 4 years, 6 months ago

We cannot see sunlight at night because our earth rotate in our axis

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Anshul Yadav 4 years, 6 months ago

Because our earth is rotate

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ANSWER

What is speedometer

Posted by Palak Kesharwani 4 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Hari Shankar Shekhar 4 years, 6 months ago

Speedometer is fitted in all the vehicles it measures the speed and velocity of the vehicle in which it is going and its change it rate changes it will decrease the speed and it changes according to the velocity and by this the acceleration will change

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Jiten Singh 4 years, 5 months ago

Hsjkakssk

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Anshul Yadav 4 years, 6 months ago

It is used in bike car

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Yogita Ingle 4 years, 6 months ago

Speedometer: Measures and displays instantaneous speed of the vehicle.

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एबीसीडी

Posted by Rishav Thakur 4 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Define rigidity

Posted by Krish Diwakar 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Jayanthika Krishnamoorthy 4 years, 6 months ago

Rigid means unbendable or inflexible The matter which undergoes rigid's property is called rigidity

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What is democracy

Posted by Jai Prakash Gupta 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Ayush Tyagi 4 years, 5 months ago

Democracy as a form of government in which rulers are elected by peoples and can change by peoples if they wish so

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Jiten Singh 4 years, 6 months ago

Democracy means that people can live freed omly

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Anshul Yadav 4 years, 6 months ago

Democracy is a form of government which is elected by people

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ANSWER

Who has discovered the nucleus

Posted by Chanakyakumar Hinge 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Jiten Singh 4 years, 6 months ago

Robert brown

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Anshul Yadav 4 years, 6 months ago

Robert brown was discovered the nucleus in the cell

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Khushi Verma Verma 4 years, 6 months ago

Ernest Rutherford discovered the nucleus

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ANSWER

Convert following temperature into Kelvin

Posted by Chirag Balayan 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 6 months ago

You can convert between Celsius and Kelvin like this: Kelvin = Celsius + 273.15. Often, the value of 273 is used instead of 273.15. Check with your teacher on this point. All examples to follow will use 273.

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Difference between parynchyma and collenchyma.

Posted by All Rounder Adarsh 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 6 months ago

Parenchyma has a thin cell wall of their cells, and are made up of cellulose. Whereas collenchyma cells have an uneven cell wall made up of pectin and hemicellulose. There is a hard and thick cell wall present of the sclerenchyma cells, which is made up of the lignin.

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Difference between the loudness and a pitch.

Posted by All Rounder Adarsh 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Shubham Saini 4 years, 6 months ago

Loudness: Loudness is a characteristic of a sound by which a loud sound can be distinguished from a faint sound even though both have the same pitch. Pitch: Pitch is the characteristic of sound by which you can distinguish a shrill sound from a grave (hoarse) sound even though the two sounds have the same loudness.

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Average speed and average velocity ?

Posted by Vaibhav Gavande 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Ayush Tyagi 4 years, 5 months ago

Average speed of a body is known as the total distance covered by a body upon the total time taken to cover the distance and average velocity is known as the total displacement of a body upon total time taken

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Meghna Thapar 4 years, 6 months ago

The average speed of an object is defined as the distance traveled divided by the time elapsed. Velocity is a vector quantity, and average velocity can be defined as the displacement divided by the time.

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ANSWER

What is lear diffusion

Posted by Jahanvi Sharma 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

Diffusion is the net movement of molecules of a substance from a region of their higher concentration to a region of their lower concentration. Net movement means there are more molecules moving in one direction than in the opposite direction.

Example: Opening a bottle of perfume in a room will result in the gradual diffusion of the perfume from the region of higher concentration (the bottle) out into the room. Diffusion will continue until the perfume has a more or less uniform concentration throughout the bottle and room.

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Properties of diffusion

Posted by Jahanvi Sharma 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 6 months ago

Diffusion is a result of the kinetic properties of particles of matter. The particles will mix until they are evenly distributed. Diffusion may also be thought of as the movement of particles down a concentration gradient. The term "diffusion" comes from the Latin word diffundere, which means "to spread out."

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Write the equation of motion and meaning of their symbol

Posted by Shruti Patidar Patidar 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Hari Shankar Shekhar 4 years, 6 months ago

There are three equation of motion first equation is according to the velocity time graph ,v= u+at in this equation v stands for final velocity U stands for initial velocity and a stands for acceleration and t stands for time taken the second equation of motion is according to distance time graph, s= ut+1/2at*t in this s stands distance u stands for initial velocity t stands for time taken t*t stands for t square and a stands for acceleration the third equation of motion is according to velocity distance graph, 2as= v*v-u*in this a stands for acceleration s stands for distance covered v*v stands for v square which is final velocity and U*U stands for u square which is initial velocity

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In a class, a teacher discussed the concept of division of labour in the cells of living organisms and wanted the students to give reasons for the cells to show this property a. Why is division of labour desirable in a cell ? b. How can we apply this in our daily lives?

Posted by Prakarsha Das Roy 4 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Do the crystal look alike

Posted by Divyanshu Raj 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 6 months ago

No crystals are not alike they are like because shape and size of crystals are same and fixed.

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ANSWER

Give demonstration of endosmosis and exusmosis

Posted by Vishav Ghangas 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

Endosmosis	Exosmosis
The solvent moves into the cell. (Endo = inside)	The solvent moves out of the cell. (Exo = outside)
Osmosis towards the inside of a cell.	Osmosis towards the outside of a cell.
Occurs when there is lower osmotic pressure.	Occurs when the osmotic pressure is higher.
Hypotonic solutions induce endosmosis in <a href="https://byjus.com/biology/cells/">cells </a>(distilled water is hypotonic because it contains no solute).	Hypertonic solutions induce exosmosis in cells (Intravenous Fluid is often hypertonic as it has many solutes).
Higher water potential of the surrounding areas when compared to the cytosol (the watery part of cytoplasm in a cell).	Lower water potential of the surrounding areas when compared to the cytosol.
As a result, the cell swells.	As a result, the cell shrinks.
Example: Raisins swell when placed in normal water.	Example: Raisins shrivel when placed in the concentrated salt solution.

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What is comphor

Posted by Bhupinder Singh 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Tarushi Jaipuria 4 years, 6 months ago

Camphor is a volatile substance which has a property to sublime .

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Ankush Dhyani 4 years, 6 months ago

Bhai us ko kapoor bhe bolte ha jo haven me use hota ha

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Meghna Thapar 4 years, 6 months ago

Camphor (Cinnamomum camphora) is a terpene (organic compound) that's commonly used in creams, ointments, and lotions. Camphor oil is the oil extracted from the wood of camphor trees and processed by steam distillation. It can be used topically to relieve pain, irritation, and itching.

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What is meant by the statement `rest and motion are relative terms'? Give example to show it.

Posted by Ragini Amrutkar 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 6 months ago

Rest and motion are the relative terms because they depend on the observer's frame of reference. So if two different observers are not at rest with respect to each other, then they too get different results when they observe the motion or rest of a body.

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Defference between evaporation and boiling

Posted by Bunty Mona 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Ayush Tyagi 4 years, 5 months ago

1 Evaporation is a surface phenomena while boiling is a bulk phenomenon 2 Evaporation can be on any temperature but boiling has its temperature

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Hari Shankar Shekhar 4 years, 6 months ago

Evaporation means changing the state of water means liquid form into gaseous form without reaching the boiling point is known as evaporation but boiling is changing the form of water into gaseous state by reaching the boiling point is known us boiling evaporation give kinetic energy to some of the molecules of the state to convert into another state but boiling give so much kinetic energy to every state to convert into another statesome of the examples of evaporation in drying our cloth which is wet in sunshine and the example of boiling is boiling of water

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Give an example of osmosis

Posted by Rajni Bhola 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Sanjay Sahani 4 years, 5 months ago

In a beaker take water and put some raisins inside it after some time you will notice that the raisins will have water inside it so it means osmosis is the process of movement of water from high concentration to low concentration through semipermeable membrane and in this activity raisin acts like semipermeable membrane of the cell

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Chandeep Singh 4 years, 6 months ago

Absorption of water by plant roots

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Yogita Ingle 4 years, 6 months ago

Osmosis is a process by which the molecules of a solvent pass from a solution of low concentration to a solution of high concentration through a semi-permeable membrane.

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What is the difference between unicellular and multucellular organisms with examples

Posted by Anunay Shreyas 4 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Anunay Shreyas 4 years, 4 months ago

Thanks

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Jiten Singh 4 years, 6 months ago

Unicellular are Those organisms which has single cell whereas multicellular are those organisms which have multiples cell

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Karthik.S Karthik.S 4 years, 6 months ago

Unicellular have one cell Most of them are prokaryotes They can seen thorugh microscope Ex-- amoeba paramecium Euglena Multicellular have more than one cell They are eukaryotes Most of them can see directly (Some exceptions on boyh sides)

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Bunty Mona 4 years, 6 months ago

Unicellular organisms- Organisms which have one cell (2)eg-amoeba Multicellular organisms- Organisms which have more than one cell (2)eg- animals

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