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?????? ???????? :- 1) They have only magnitude not direction. 2) This quantity can be a number and unit. 3) Scalar can divide another scalar. ?????? ???????? :- 1) They have both magnitude and direction. 2) This quantity must need specify the direction along with the magnitude. 3) Vectors cannot divide each other.

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Nikhil Raj 4 years, 4 months ago

Scalar quantity are those quantity in which it has only magnitude and vector quantity are those those quantity in which direction and magnitude both involved

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Manan Gulati 4 years, 4 months ago

Scaler quantities are the quantities which have magnitude not direction . Vector quantities are the quantities which have both magnitude and direction .

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Abhishek Chaudhary 4 years, 4 months ago

Scaler quantities are the quantities which have only magnitude not direction . Vector quantities are the quantities which have both magnitude and direction .

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Girdhar Arora 4 years, 4 months ago

Scalar means that quantity that have only magnitude not a specific directions whereas vector quantity have both magnitude and specific direction. E.g= distance is scalar quantity while displacement is a vector quantity .

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ANSWER

What is the advantage of having deeply folded membrane in mitochondria?

Posted by Saumya Rwt 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Priyanka Kushwaha 4 years, 4 months ago

It increases the space for atp generation

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ANSWER

What will happen when a plant cell is kept in different kind of solution. explain in detail?

Posted by Vraj Patel 4 years, 4 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Why Chromatin material condenses to form chromosomes when the cell is about to divide?

Posted by Sahitya Rathore 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Eva Nayak 4 years, 4 months ago

In mitotic phase it divides

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ANSWER

I want the notes of second chapter

Posted by Suryansh Pratap Singh 4 years, 4 months ago

CBSE > Class 09 > Science

3 answers

Taneesha D Patel 4 years, 4 months ago

Which subject tell me I will send

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Tausif Khan 4 years, 4 months ago

Kon se sub ka

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Saumya Rwt 4 years, 4 months ago

Which subject??

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ANSWER

Make a mind maps of the following chapter first matter in our surrounding

Posted by Pandya Urvashi 4 years, 4 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What are the functions of cell membrane

Posted by Gorika Mahajan 4 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Abhishek Chaudhary 4 years, 4 months ago

It is the slectevely permeable membrane

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Girdhar Arora 4 years, 4 months ago

1)Outermost coving 2)Facilities movement of some materials because it is selective permeable 3 )it is thin and flexible 4) flexibility enables the cell to energy 5) hold the contents of cell 6 )composed of organic molecules(lipid +protein ) 7) living 8) usually present in all cells {including eukaryotic and prokaryotic } 9) provides a definate shape to cell

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ANSWER

How gases and liquids are compressible substances ?

Posted by Riti Mehta 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Nibir Mahanta 4 years, 4 months ago

Gases are compressible because the intermolecular space is very large in gases, whereas liquids are not compressible because in liquids, the intermolecular space is less.

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ANSWER

The rate of evaporation of a liquid increase on heating . Explain

Posted by Rupsa Mal 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 4 months ago

Evaporation basically means the surface liquid gets enough kinetic energy to change into gaseous state. Definition: when the surface pressure of a liquid is equal to the vapour pressure of the atmosphere, it evaporates.
When we heat a liquid, we give it energy, n hence, the (kinetic) energy of the liquid increases, (so consequently the kinetic energy of the surface liquid also increases.

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ANSWER

Which characteristic of a gas is used in supplying oxygen cylinders to hospital??

Posted by Saumya Rwt 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 4 months ago

High compressibility is used in supplying oxygen cylinders to hospitals . Gases have large intermolecular spaces between them and can be easily compressed. The gases can be compressed to liquids and can be stored & transported in cylinders.

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ANSWER

Differentiate between mass and weight And what is magnitude?

Posted by Priyanka Kushwaha 4 years, 4 months ago

CBSE > Class 09 > Science

3 answers

Priyanka Kushwaha 4 years, 4 months ago

What is gravitational pull can anyone explain this once more

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Aryan Yadav 4 years, 4 months ago

Mass is the material contained in the body. Weight is the gravitational pull acting on the body.

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Riti Mehta 4 years, 4 months ago

Mass :- Occupying space Weight :- Volume or vajan or bhar

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ANSWER

What happens when a liquid is heated?

Posted by Uttam Prasad 4 years, 4 months ago

CBSE > Class 09 > Science

5 answers

Abhishek Verma 4 years, 4 months ago

When liquid is heated it evaporatesin form of gases

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Riti Mehta 4 years, 4 months ago

When a liquid is heated , it changes its state from liquid to gaseous

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Srishty Kumari 4 years, 4 months ago

When a liquid is heated , it change its state from liquid to gas .

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Priyanka Kushwaha 4 years, 4 months ago

When a liquid is heated Its vaporate

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Nancy Maurya 4 years, 4 months ago

It evaporated to form of gas

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ANSWER

Name the three states of matter?

Posted by Uttam Prasad 4 years, 4 months ago

CBSE > Class 09 > Science

5 answers

Bhagyashri Patkari 4 years, 4 months ago

Solid, liquid, gas

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Saumya Rwt 4 years, 4 months ago

Solid, liquid and gas

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Riya Singh 4 years, 4 months ago

Solid, liquid, gas

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Srishty Kumari 4 years, 4 months ago

The three states of matter is solid , liquid,gas. Another two is plasma and Bose Einstein Condensate.

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Nancy Maurya 4 years, 4 months ago

Solid liquid and gas

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Pressure on the surface of a gas is increased.what will happen to the inter particle forces

Posted by Uttam Prasad 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 4 months ago

As pressure is increased the intermolecular forces between the gas molecules are increased. Explanation: Intermolecular forces are the forces of attraction between the molecules of a gas. As the pressure increases the molecules of the gas come closer together and finally form a liquid.

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ANSWER

What are the difference between Prokaryotic and Eukaryotic cells

Posted by Sahitya Rathore 4 years, 4 months ago

CBSE > Class 09 > Science

5 answers

Anmol Preet 4 years, 4 months ago

??????????? ???? :- 1) Small in size. 2) Contain single chromosome. 3) Organelles absent. 4) Nucleolus absent. 5) Cell division by fission etc. Examples - bacteria blue green algae etc. ?????????? ???? :- 1) Large in size. 2) Contain more than one chromosome. 3) Organelles present. 4) Nucleolus present. 5) Cell division by mitosis or meiosis. Examples - man etc.

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Priyanka Kushwaha 4 years, 4 months ago

We can classify the cell on the basis of their nuclear membrane which is prokaryotic and eukaryotic and prokaryotic cell there is no nucleus and in eukaryotic cell that is a nucleus this is the major difference between prokaryotic cell and eukaryotic cell

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Savita Singh 4 years, 4 months ago

Prokaryotic Cells: In some organisms like bacteria, the nuclear material is not enclosed by nuclear membrane and membrane bound cell organelle are absent.Such nucleus is called nucleotid and such cells are known as prokaryotic cell. such cells have single chromosome. Eukaryotic Cells: Cells having well defined nucleus and having membrane bound cell organelle is termed as eukaryotic cell.Such cells have more than one chromosomes.

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Priyanshi Maheshwari 4 years, 4 months ago

Sexual reproduction

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Priyanshi Maheshwari 4 years, 4 months ago

*** organ

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ANSWER

The smell of hot sizzling food reaches you several .etres away but to get the smell from cold food you have to go close

Posted by Mansi Bhoyar 4 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Jill Pansuriya 4 years, 4 months ago

Particles of matter are continuously moving. They possess kinetic energy. Aa the temperature increases, particles move faster. The particles of aroma diffuse in the air and reach to us several meters away. But to get smell of cold food we need to go closer because the particles of aroma move slowly.

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Srishty Kumari 4 years, 4 months ago

At higher temperature molecules diffuse into air at a faster rate and reach longer distances. Hence,the smell of hot sizzling food reaches as quickly even when we are several metres away,but to get the smell of cold food,we have to go close to it.

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ANSWER

I can't understand what is inertia

Posted by Hrishi Singh 4 years, 4 months ago

CBSE > Class 09 > Science

3 answers

Anmol Preet 4 years, 4 months ago

The inability of a body to change its state of motion by itself.

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Harsh Dubey 4 years, 4 months ago

THE INABILITY TO CHANGE THE STATE OF (REST/MOTION)

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Yogendra Kumar 4 years, 4 months ago

Inrtia is pseudo force that act on body , according to Newton second law if a body in rest it will always want to be in its initial condition and same of in motion. If we apply some force on that body which is in rest/motion it opposes the effect of force that's all inertia is .?

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ANSWER

What is the reflection

Posted by Anish Lakra 4 years, 4 months ago

CBSE > Class 09 > Science

3 answers

Riya Singh 4 years, 4 months ago

Reflection is a light image which bounce back from a point to backward.

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Sukhandeep Kaur Sukhan 4 years, 4 months ago

It's like a shadow

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Abhay Singh 4 years, 4 months ago

Reflection is a conduct light mirror is called reflection

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ANSWER

Differentiate between perfume and the perfume smell of perfume following based on the characteristics A) shape B)rigity C) interparticular force of attraction

Posted by Naman Pattanaik 4 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Girdhar Arora 4 years, 4 months ago

And the last interarticular force of attraction is more in perfume as it is solid .and it is less in smell as it is gas

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Girdhar Arora 4 years, 4 months ago

Characteristics of smell of perfume is that it is gas and is highly compressible and it doesn't have fixed volume and fixed shape and it's particles are not closely packed and force of attraction is also very less . Speaking about perfume I think it's bottle of perfume so it's a solid and have fixed shape and volume and can't be compressible and it's particles are closely packed and their kinetic energy is less as diffusion is slow . Smell of perfume is gas so it is not rigid and bottle of perfume is rigid

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ANSWER

What is a vector quantity

Posted by Anurag Dubey 4 years, 4 months ago

CBSE > Class 09 > Science

5 answers

Anmol Preet 4 years, 4 months ago

1) They have both magnitude and direction. 2) This quantity must need specify the direction along with the magnitude. 3) Vectors cannot divide each other.

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Harsh Dubey 4 years, 4 months ago

The quantity which has magnitude as well as directio

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Shagunpreet Kaur 4 years, 4 months ago

A quantity that has both Magnitude and direction.

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Saleha Khan 4 years, 4 months ago

The quantity which has (numerical value) magnitude an direction both , is known as vector quantity.

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Anurag Dubey 4 years, 4 months ago

It is a physical quantity having both magnitude as well as direction example velocity displacement

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ANSWER

Convert the temperature to the Kelvin scale 25°C..

Posted by Khushi Choudhary 4 years, 4 months ago

CBSE > Class 09 > Science

4 answers

Saumya Rwt 4 years, 4 months ago

25° +273=298

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Priyanshi Maheshwari 4 years, 4 months ago

298k hottu

2Thank You

₹! &#! _@ ?? 4 years, 4 months ago

Temperature in kelvin =temperature in 0 Celsius +273 so 25 degree Celsius equal to C (25+ 273)k =298k

3Thank You

Anurag Dubey 4 years, 4 months ago

Temperature in kelvin =temperature in 0 Celsius +273 so 25 degree Celsius equal to C (25+ 273)k =298k

2Thank You

ANSWER

What is the defination of pure substance

Posted by Krishna Thakur 4 years, 4 months ago

CBSE > Class 09 > Science

4 answers

₹! &#! _@ ?? 4 years, 4 months ago

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

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Anurag Dubey 4 years, 4 months ago

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

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Abhishek Garg 4 years, 4 months ago

The substance which are pure

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Akshiii ?? 4 years, 4 months ago

A substance that has a fixed chemical composition throughout is called pure substances such as water, air and nitrogen. A pure substance does not have to be of a single element or compound. ~ Hope it helps ?

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ANSWER

Lori moves 4m due east and 3m due west What is the distance covered by lori? What it is displacement?

Posted by Yashvi Shah 4 years, 4 months ago

CBSE > Class 09 > Science

2 answers

Akash Ashwin Baa 4 years, 4 months ago

Distance = 7m / Displacement = 1m

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Akshiii ?? 4 years, 4 months ago

Distance = 7m \ Displacement=1m

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ANSWER

To draw a labelled diagram of a eukaryotic cell and write main function of mitochondria, Golgi apparatus, Lysosomes, plastids.

Posted by Ruby Jha 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Vivek Sharma 4 years, 4 months ago

Ktdptaizoa7 ft dp5dp7yiz dsc upyou datt dp souU ac ot

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ANSWER

To prepare a temporary mount of onion peel cell and study its structures.

Posted by Ruby Jha 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Akshiii ?? 4 years, 4 months ago

Go to the book seller (or burrow )and buy srijan publisher's (A Simple study of biology) in that book page no. 59 and 60.. both the activities are given onion peel also and... Human cheek cells also... Well here's the conclusions :- 1)In onion peel- Onion bulb is format of numerous cells. The cells are plant cells because of the presence of cell wall and large vacuole. 2)In human cheek cells- our body is formed of cells. The cells are animal cells as each cell has only a cell membrane and its outer boundary. Cell wall, central prominent vacuole and plastids are absent.

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