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

1.which of the following are matter? Chair, air ,love, smell ,hate, almond, thought ,cold ,lemon water ,smell of perfume Ans. Chair, air, almonds, lemon water 2.Give reason for the following observation a. A smell of hot sizzling food reaches you several metres away but to get the smell from cold food you have to go close a. It is because on increasing temperature the kinetic energy of particle increasing and hence the rate of diffusion decreases. 3.A driver is able to cut through water in swimming pool which property of matter does this observation show Ans. This observation show the particle of water has space between them and their having less forces of attraction that is why the diver is able to cut through water. 4.What are the characteristics of the particles of matter Ans following are the characteristic of particles of matter:- 1. matter are made up of small particles 2. particles of matter have space between them 3. these particles are continuously moving 4.particles of matter attract each other

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How are sol , solution and so suspension different from each other

Posted by Shreya Choudhary 2 years, 4 months ago

CBSE > Class 09 > Science

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Deduce the following equations of motion: (i) s = ut + 1/2at2 (ii) v2 = u2 + 2as

Posted by No Name 2 years, 4 months ago

CBSE > Class 09 > Science

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What is osmosis ? What will happen if we put an animal on a plant cell into a solution of sugar or salt in water

Posted by Drishya Mourya 2 years, 4 months ago

CBSE > Class 09 > Science

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Do all cells look alike in terms of shape and size

Posted by Prajin E 2 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Navya Agarwal 2 years, 5 months ago

No the the cells of different body parts are not similar we can consider the example of nerve cell and muscle cell they are different From each other in shape

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Short note on Nucleus

Posted by Lavanshika Sankhla 2 years, 5 months ago

CBSE > Class 09 > Science

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Aditya Singh Rathore 2 years, 5 months ago

The nucleus is a double-membraned organelle that contains the genetic material and other instructions required for cellular processes. It is exclusively found in eukaryotic cells and is also one of the largest organelles

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Activity 1.7 chemistry

Posted by Arshiya Lohia 2 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Aditya Singh Rathore 2 years, 5 months ago

Observation: Hammering a piece of the iron nail does not break the nail but flatten its surface. Hammering chalk breaks the chalk and gives us powdered chalk. We can stretch the rubber band to a large length without any break. Inference: Force of attraction between molecules of different substances is different. Explanation: In activity 1.6 we saw that force of attraction between solid, liquid and gases is different. This experiment focuses on the force of attraction between different solids. Here all the particles are solid, but the force of attraction between their molecule is different. In iron nail force of attraction is the highest. The force of attraction in chalk is lower, so breaking them into pieces is easy. Rubber contains a long chain of molecules linked to each other by covalent bonds. This long chain structure gives them high elasticity.

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In detergent solution while washing clothes what happen to our finger

Posted by Utsav Kumar Hars 2 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Utsav Kumar Hars 2 years, 5 months ago

It is hypotonic solution

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Hardest metal in the world

Posted by Aditya Mishra 2 years, 5 months ago

CBSE > Class 09 > Science

4 answers

Ritika Singh 2 years, 4 months ago

Tungsten is the hardest metal in the world

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Tanisha Adhikari 2 years, 5 months ago

Tungsten

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Mahi Patel 2 years, 5 months ago

Tungsten

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Diya Sree 2 years, 5 months ago

Tungsten

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What happen when the temperature of solid increase s ?

Posted by Aarush Negi 2 years, 5 months ago

CBSE > Class 09 > Science

5 answers

Tanisha Adhikari 2 years, 5 months ago

It turns into liquid ex - ice is solid and when it melt it turn into liquid state

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Mahi Patel 2 years, 5 months ago

It will become liquid

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Krishna Agrawal 2 years, 5 months ago

If the temperature of solid increases it will melt down and become liquid

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Kanishka Bhaskar 2 years, 5 months ago

It melts down

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Saurabh Yadav 2 years, 5 months ago

That substance change into liquid

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What is rigidity compressibility fluidity filling the gas container shape kinetic energy and density?

Posted by Shantanu Kumar 2 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Rashmi Chandola 2 years, 5 months ago

Rigidity = the hardness of the matter.

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What will happen to the RBC when we keep it in concentrated solution of salt?

Posted by Minu Bala 2 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Rashmi Chandola 2 years, 5 months ago

The RBC cells get shrink.

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Shreyansh Ravi 2 years, 5 months ago

The rcb will shrink as it loose water by osmosis

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Why does the raisin swell when we keep it in plain water?

Posted by Minu Bala 2 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Pratha Sharma 2 years, 5 months ago

What is the meant of substance

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Pratha Sharma 2 years, 5 months ago

Chapter 2nd

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Minu Bala 2 years, 5 months ago

When we keep raisin in water the water present inside the raisin is low .So,by the process of osmosis the water from high concentration moves to the water with low concentration i.e this is a form of hypotonic medium.

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Why does the reasons well when we keep it in plain water?

Posted by Minu Bala 2 years, 5 months ago

CBSE > Class 09 > Science

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Write any four difference between distance and displacement

Posted by Md Barik 2 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Shreyansh Ravi 2 years, 5 months ago

Displacement is equal to or less than the distance

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Shreyansh Ravi 2 years, 5 months ago

Distance never be 0 or negative but displacement can

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Saurabh Yadav 2 years, 5 months ago

Distance is scalar quantity and displacement is vector quantity

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Some quantity of sugar can be transferred to container of different shapes and can take the shape of container. but still it is called solid. explain why?

Posted by Manpreet Kaur 2 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Minu Bala 2 years, 5 months ago

as the sugar crystals are of the same size, and shape they are considered solid (they are small and in large numbers that is the reason they take shape of the container in which they are kept.)

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What are nucleas

Posted by Jagu R 2 years, 5 months ago

CBSE > Class 09 > Science