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Put an unlit incense stick in a corner of your room. How close so you have to go near it so as to get its smell? Now light get incense stick . What happens? Do you get the smell sitting at a distance. Record your observations.

Posted by Saumya Rwt 4 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 7 months ago

You need to get really close to get to smell the unlit incense stick whereas when we light the incense stick we can get the smell even from a distance.
The reason is simple. When we light the incense stick the kinetic energy increases. Due to the increase in kinetic energy the particles vibrate more quickly. the particles of the aroma of the lit incense stick thus diffuse faster in the air and reach us far away.

ANSWER

Open a tap, try breaking the stream of water with your fingers. Were you able to cut the stream of the water? What could be the reason behind the stream of water remaining together? Record your observations.

Posted by Saumya Rwt 4 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 7 months ago

No, it isn't possible to break a stream of water with fingers.
The reason for this is that water is a liquid and its atoms are bonded together by attractive forces. Although the inter molecular attraction forces in water (liquids) is a bit lesser than solids so the molecules can move around freely, but these forces are strong enough to bind the water molecules with considerable force so that they don't break apart.

ANSWER

Find six rational number b/w 3 and 4

Posted by Mohit Rathore 4 years, 7 months ago

CBSE > Class 09 > Mathematics

4 answers

Sia ? 4 years, 7 months ago

3.1, 3.2, 3.3, 3.4, 3.5 and 3.6

Jasmeet Kaur 4 years, 7 months ago

3=21 , 4=28 7 7

Mahesh Kumar 4 years, 7 months ago

3.1,3.2,3.3,3.4,3.5,3.6

Versni V 4 years, 7 months ago

The six rational numbers between 3 and 4 are : (31/10, 32/10 , 33/10 , 34/10 , 35/10, 36/10).

ANSWER

Poetic Devices of Wind

Posted by Lakshya Gupta 4 years, 7 months ago

CBSE > Class 09 > English Lang & Lit. (184)

1 answers

Harshita Sarda 4 years, 6 months ago

Anaphora Repeatation Symbolism So,these are some poetic devices of wind chapter.

ANSWER

A rational number betwen 1/7 and 2/7 is

Posted by Harsha Yadav 4 years, 7 months ago

CBSE > Class 09 > Mathematics

2 answers

Mahesh Kumar 4 years, 7 months ago

3/14

Sia ? 4 years, 7 months ago

3/14

ANSWER

What is the rise and fall of Napolean

Posted by 505 Sree Krishna Kottam 4 years, 7 months ago

CBSE > Class 09 > Social Science

2 answers

Sia ? 4 years, 7 months ago

1804 - 1814

Sia ? 4 years, 7 months ago

Born on the island of Corsica, Napoleon rapidly rose through the ranks of the military during the French Revolution (1789-1799). After seizing political power in France in a 1799 coup d'état, he crowned himself emperor in 1804.

ANSWER

What is the rise and fall of Napolean

Posted by 505 Sree Krishna Kottam 4 years, 7 months ago

CBSE > Class 09 > Social Science

1 answers

Sia ? 4 years, 7 months ago

1804 - 1814

ANSWER

Summary of the gift of the magi

Posted by Pallavi Pallavi 4 years, 7 months ago

CBSE > Class 09 > English Lang & Lit. (184)

2 answers

Sia ? 4 years, 7 months ago

The Gift of the Magi is a short story by the American writer O. Henry, written and published in 1905. It takes place at Christmas time and tells the story of Jim and Della Dillingham, a poor, young married couple who don't have enough money to buy each other Christmas gifts.

Pallavi Pallavi 4 years, 7 months ago

Thankyou dear ?

ANSWER

Why did the poet name his poem 'the road not taken' instead he could name his poem as 'the road taken'?

Posted by Lavanya Prakash 4 years, 7 months ago

CBSE > Class 09 > English Lang & Lit. (184)

1 answers

Girdhar Arora 4 years, 7 months ago

I think he regret his choice that he chose the road which is less travelled buy so he name the poem that he talking about road which is not taken .

ANSWER

I want to ask how to write "good evening" in french. ?

Posted by Hansika Baghel 4 years, 7 months ago

CBSE > Class 09 > French

5 answers

Sia ? 4 years, 6 months ago

bonne soirée

Yashi Vijay 2 years, 10 months ago

Bonne soirée!

Janvi Chum 4 years, 4 months ago

bon soir!

Paarvi Parashar 4 years, 6 months ago

Bonsoir!

Dark Gamer 4 years, 6 months ago

Bonne soirée

ANSWER

Which of the following is quotient obtained on dividing -18xyz² by -3xz ?

Posted by Prathamesh Kharade 4 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Mahesh Kumar 4 years, 7 months ago

6yz is the answer

ANSWER

( x²-3x+2 ) ÷ ( x-2 )

Posted by Prathamesh Kharade 4 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Mahesh Kumar 4 years, 7 months ago

X=2 X²=4,3x=6,2 4-6+2 Remainder=0

ANSWER

Divide ( x²+5x-8 ) by ( x+3 ). What is the remainder ?

Posted by Prathamesh Kharade 4 years, 7 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

( 2x³+5x²+9 ) ÷ ( x+3 )

Posted by Prathamesh Kharade 4 years, 7 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

A gas can exert pressure on the walls of the container.assign reason

Posted by Uttam Prasad 4 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 7 months ago

The molecules are continually colliding with each other and with the walls of the container. When a molecule collides with the wall, they exert small force on the wall The pressure exerted by the gas is due to the sum of all these collision forces.

ANSWER

What is AI

Posted by Chetan Charnawat 4 years, 7 months ago

CBSE > Class 09 > Information Technology (402)

4 answers

Amrit Gupta 4 years, 7 months ago

AI Means Artificial Technology It is used in robots and in some devices for automation purposes also for relevance. Some examples of AI used are - GOGGLE AND TESLA

Shruti Kumari 4 years, 7 months ago

AI is artificial intelligence

Mahesh Kumar 4 years, 7 months ago

AI is artificial intelligence

Divyansh Jain 4 years, 7 months ago

AI is Artificial Intelligence.

ANSWER

Find the value of the polynomial 5x-4x^2+3

Posted by Tausif Khan 4 years, 7 months ago

CBSE > Class 09 > Mathematics

2 answers

Tausif Khan 4 years, 5 months ago

Answer

Shatakshi Pandit 4 years, 7 months ago

2

ANSWER

Air is homogeneous or heterogeneous mixture ?

Posted by Sakshi Bharadwaj 4 years, 7 months ago

CBSE > Class 09 > Science

4 answers

Varun Gupta 4 years, 7 months ago

Heterogeneous mixture

Mahesh Kumar 4 years, 7 months ago

Homogeneous mixture

Ayushi Dhyani 4 years, 7 months ago

Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Salt, sugar, and many other substances dissolve in water to form homogeneous mixtures.

Darshan Kishor 4 years, 7 months ago

Darshan

ANSWER

Find the decimal expansion of 10/3

Posted by Vishwa Vishwa.S 4 years, 7 months ago

CBSE > Class 09 > Mathematics

2 answers

Samriddhi Srivastav 4 years, 6 months ago

3.33

Neha Bohra 4 years, 7 months ago

10/3 = 3.33333........

ANSWER

Write a letter to your brother suggesting him how he can keep himself from the worldwide pandemic covid-19

Posted by 👵👧🏽🤶👱 🙀😽 4 years, 7 months ago

CBSE > Class 09 > English Lang & Lit. (184)

1 answers

Raju Mehta 4 years, 5 months ago

I dont know it

ANSWER

Please send notes of the fundamental unit of life

Posted by Rohit Saini 4 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Anushka Singh 4 years, 7 months ago

1. All the living organisms are made up of fundamental unit of life called “ cell”. 2. The cell is a Latin word for “a little room”. 3. The scientist Robert Hooke saw a little room in the cork (the bark of a tree) resembled the structure of a honeycomb. The use of the word “Cell” to describe these units is used till this day in Biology as” Cell Biology”. 4. The Compound Microscope consist eye piece,objective lens and condenser to observe a cell after putting a drop of Safranin (for plant cell) and methylene blue (for animal cell). 5. The scientist Leeuwenhoek saw free living cells in the pond water for the first time. (father of microbiology) 6. The scientist Robert Brown discovered the nucleus in the cell. 7. The cell theory states that all the plants and animals are composed of cells, it was proposed by Schleiden and Schwann. 8. The cell theory was further expanded by Virchow by suggesting that “all cells arise from the pre-existing cells”. 9. The cells differ in size, shape, structure (Please refer to Fig. 5.2/5.3: Onion peel/Various cells in Human body, NCERT Book Page-57/58): Types of cells: Onion cells, Smooth muscle cell, Blood cells, Bone cell, Fat cell, Nerve cell, Ovum, Sperm etc. Each kind of cell performs specific function. 10. A single cell may constitute a whole organism as in Amoeba, Chlamydomonas, Paramecium and Bacteria; these are called as unicellular organisms. Whereas in multi-cellular organisms (Human beings) division of labor is seen. 11. The feature in almost every cell is same: Plasma membrane, nucleus and cytoplasm. 12. Plasma membrane: It is the outermost covering of the cell. It is called as selective permeable membrane (because it prevents movement of some materials). It helps in diffusion and osmosis Diffusion: movement of substance from high concentration to low concentration. Eg; exchange of carbon dioxide or oxygen with external environment. Osmosis: it is the passage of water from the region of high water concentration to a region of low water concentration through a selective permeable membrane. a) The cell gains water, if the medium surrounding the cell has a higher water concentration (Hypotonic solution) than the cell. b) The cell maintains the same water concentration as the cell (Isotonic solution), water crosses the cell membrane in both directions. c) The cell loses water, if the medium has lower water concentration (Hypertonic solution) than the cell. Note - The cell drinking is endosmosis; omission of water is called ex-osmosis. 13. The cell engulfs food is called endocytosis and ejects solid is called exocytosis. Amoeba acquires food through endocytosis and excretion of solid is called exocytosis. 14. The cell wall is a rigid outer covering composed of cellulose. It provides structural strength to plant cells. When a living cell loses water, there is shrinkage of contents of a cell away from the cell wall. This phenomenon is called as plasmolysis. The cell walls permit the cells of plants, fungi and bacteria to withstand very dilute (Hypotonic) external media without bursting. 15. The Nucleus: It is a dark colored, spherical or oval, dot-like structure near the center of a cell called Nucleus. The nucleus plays a central role in cellular activities/reproduction. The chromatin material gets organized into chromosomes. The chromosomes containinformation for inheritance of features from parents to next generations in the form of DNA (Deoxyribo Nucleic Acid ) and protein molecules. The functional segments of DNA are called genes. 16. In some organisms like Bacteria nucleus is not covered by nuclear membrane. Hence it is called as prokaryote. (Pro= primitive; karyote = karyon = nucleus.) The organisms with cells having a nuclear membrane are called eukaryotes. 17. Differences between prokaryotes and eukaryotes Prokaryotes Eukaryotes Size: generally small (1-10 µm) Size: generally large. (5-500 µm) Nuclear region: Not well defined and not surrounded by a nuclear membrane & known as nucleoids. Nuclear region: Well defined and surrounded by a nuclear membrane Chromosome: Single Chromosome: More than one Chromosome Membrane-bound cell organellesAbsent Membrane-bound cell organellespresent Eg- bacteria, blue green algae Eg fungi, plant cell and animal cell. 18. Cell organelles: Every cell has fluid matrix (other than nucleus) is called cytoplasm. The nucleus and cytoplasm is together called as protoplasm. The protoplasm term was coined by Purkinje. It has important cell organelles: Endoplasmic Reticulum (ER), Golgi apparatus, Lysosomes, Mitochondria, Plastids, and vacuoles. 19. Endoplasmic Reticulum (ER): It is a large network of membrane –bound tubules and vesicles. There are two types of Endoplasmic Reticulum Rough Endoplasmic Reticulum (RER) (It looks rough because Ribosome’s are attached to its surface. They are the sites of protein synthesis). Smooth Endoplasmic Reticulum (SER) (It looks smooth because Ribosome’s are not attached to its surface. They are the sites of fat molecules synthesis). 1. SER; help in the functioning of enzymes and hormones to carryout biochemical activities. 2. SER detoxifies many poisons and drugs from the cell. 3. ER serves as channel for the transport of material between various regions of the cytoplasm and the nucleus. 4. Proteins and fat molecules produced by ER helps in membrane biogenesis. 21. Lysosomes: They contain membrane-bound sacs with powerful digestive enzymes (enzymes are made by RER) to digest the worn-out cell organelles. When the cell gets damaged, lysosomes may burst and the enzymes digest their own cell, hence called as “Suicidal bags of a cell”. It is a waste disposal system of the cell. 22. Mitochondria: It is covered by a double membrane. Outer membrane is very porous and the inner membrane is deeply folded. These folds create a large surface area for ATP (Adenosine Triphosphate) molecule synthesis. ATP is the energy currency of a cell; hence the Mitochondria are called as Power House of a Cell. Mitochondria have their own DNA and Ribosome’s; therefore they can make their own proteins. 23. Plastids: They are present only in plant cells. They are of two types. 1. Chromoplasts (Colored Plastids: Chloroplasts – Green pigmented and useful in Photosynthesis and also contains various other pigments like yellow or orange) 2. Leucoplasts (White or colorless plastids; stores materials such as oils, proteins, fats etc. ) Plastids are also covered by a double membrane. The matrix is called Stroma, seat for enzymatic actions. Plastids have their own DNA and Ribosome’s; therefore they can make their own proteins. 24. Vacuoles: Storage sacs for solid or liquid contents. They are small in size in animals while plants have large, may occupy 50-90 % of the cell volume. Helps to provide turgidity and rigidity to the cell. Many substances like amino acids, sugars, organi acids and proteins are stored in vacuoles. In Amoeba food vacuole is specialized to play an important role. 25. Cell: It is the fundamental structural unit of living organisms, helps in respiration, obtaining nutrition and clearing waste material or forming a new protein. Differences between Plant cell and Animal Cell ANIMAL CELL PLANT CELL Cell wall absent Cell wall present Plasma membrane is the outer layer which provides turgidity to the cell Cell wall is the outer layer which gives rigidity and turgidity to the cell Vacuoles are small in size Vacuoles are big in size Plastids are absent Plastids are present Nucleus lies in the centre. Nucleus lies on one side

ANSWER

Explain factor of production?

Posted by Vivek Rauta 4 years, 7 months ago

CBSE > Class 09 > Social Science

3 answers

Chhavi Kharb 4 years, 7 months ago

In economics, factors of production, resources, or inputs are what is used in the production process to produce output—that is, finished goods and services. The utilized amounts of the various inputs determine the quantity of output according to the relationship called the production function.

Divyansh Jain 4 years, 7 months ago

The factors of production are land, labour, physical capital and human capital.

Sia ? 4 years, 7 months ago

In economics, factors of production, resources, or inputs are what is used in the production process to produce output—that is, finished goods and services. The utilized amounts of the various inputs determine the quantity of output according to the relationship called the production function.

ANSWER

What do you mean by information technology

Posted by Deepika Jamwal 4 years, 7 months ago

CBSE > Class 09 > Information Technology (402)

2 answers

Sia ? 4 years, 7 months ago

the study or use of systems (especially computers and telecommunications) for storing, retrieving, and sending information.

Ayushi Dhyani 4 years, 7 months ago

It (Information technology) has changed everything over the years. Nowadays, IT refers to use of computer and other resources to create , store, manage and exchange all kinds of information . It is an essential and tightly integrated part of every business today. Benifits of IT are : 1 Helps to reach more potential customers. 2. Provide better service to customers.

ANSWER

How did revolution outbreak in France ?

Posted by Prathamesh Kharade 4 years, 7 months ago

CBSE > Class 09 > Social Science

3 answers

505 Sree Krishna Kottam 4 years, 7 months ago

It's because of the five factors, they are: 1.Social Inequality 2.Subsistence Crisis 3.Economic Problems 4.Strong Middle Class 5.Immediate Causes

Ayushi Dhyani 4 years, 7 months ago

April 1792, the National Assembly voted to declare war against Prussia and Austria. ... The war resulted in heavy loss for France, causing various crises among people. Many people were of the opinion that the constitution of 1791 gave power to only rich class.

❖Mʀ᭄ ℟ᴜđʀ₳★ᶠᶠ 4 years, 7 months ago

Eighteenth-century France experienced overlapping tensions that erupted in revolution in 1789. ... Economic problems intensified after bad weather doubled the price of bread in 1789. These tensions reached a crisis point in the “prerevolution” from 1787 to 1789.

ANSWER

Write down three basic characteristics of a cell

Posted by Smruti Pradhan 4 years, 7 months ago

CBSE > Class 09 > Science

4 answers

Smruti Pradhan 3 years, 10 months ago

Basic characteristics of a cell are as follows: (i) Cell is structural and functional unit of all living beings. (ii) Cells can replicate independently. (iii) Cells perform all the life sustaining activities by themselves

Anmol Preet 4 years, 7 months ago

1) Cell are the building blocks of all plants and animals. 2) A cell is capable of independent exist and perform all the basic functions of life. 3) The old and worn out cells are continually replaced by new cells.

Neha J H 4 years, 7 months ago

Cell membrane . Cytoplasm . And DNA

Aditya Malik 4 years, 7 months ago

Emsmsn

ANSWER

What was the idea of Rousseau ?

Posted by Prathamesh Kharade 4 years, 7 months ago

CBSE > Class 09 > Social Science

3 answers

Samridhi Gupta 4 years, 6 months ago

The book of social contract written by Rousseau. In his book he described his idea of ruling i.e. there must be contract between the representatives and the citizen.

Srishti Sajal 4 years, 7 months ago

Book written by Roussea is The Social Contract. In his book he describes his idea of rulling i.e. there must be contract between the representatives and the citizens.

Sia ? 4 years, 7 months ago

General will, amour de soi, amour-propre, moral simplicity of humanity, child-centered learning, civil religion, popular sovereignty, positive liberty, public opinion

ANSWER

What produces more serve burns boiling water or steam ?

Posted by Sai Chhavi 4 years, 7 months ago

CBSE > Class 09 > Science

1 answers

Shruti Agarwal 4 years, 7 months ago

Steam has more energy than boiling water. It possesses the additional latent heat of vaporization. ... Steam has more energy than boiling water. Therefore, burns produced by steam are more severe than those produced by boiling water.

ANSWER

Can we add √5 and √2?

Posted by Gaurav Bishaya 4 years, 7 months ago

CBSE > Class 09 > Mathematics

5 answers

Raghul Vijay Sanjay 4 years, 7 months ago

No

Raghul Vijay Sanjay 4 years, 7 months ago

√7

Ashish Srivastava 4 years, 7 months ago

No

Nikhil Raj 4 years, 7 months ago

No we can't add

Jaytri Rajgor 4 years, 7 months ago

Yes

ANSWER

find the value of 2.6- 0.9

Posted by Khushi Harbansi 4 years, 7 months ago

CBSE > Class 09 > Mathematics

3 answers

Neha Bohra 4 years, 7 months ago

1.7

Nikhil Raj 4 years, 7 months ago

1.7

Gaurav Bishaya 4 years, 7 months ago

1.7

ANSWER

A person is moving in a circular path of radius 21m.If the person completes the circular track 4minutes. a)Find the distance covered by the person. b)Find the displacement cover by the person. c)Find the speed of the person. d)Find the velocity of the person.

Posted by Vivek Rauta 4 years, 7 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

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