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

The French Revolution was a period of time in France when the people overthrew the monarchy and took control of the government. When did it take place? The French Revolution lasted 10 years from 1789 to 1799. It began on July 14, 1789 when revolutionaries stormed a prison called the Bastille.

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What is name of stone in science

Posted by Amrita Shah 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Sonu Yadav 4 years, 5 months ago

Throne

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Define compression chapter1

Posted by Sahil Sain 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 5 months ago

Compression: A compression is defined as the region in a longitudinal wave where the particles are cloest together.

Rarefraction: A rarefaction is defined as the region in a longitudinal wave where the particles are apart from each other.

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On a hot sunny day why do people sprinkle water on the roof or open ea ground

Posted by Shreshth Sundriyal 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Ayush Tyagi 4 years, 5 months ago

Because on hot dry Day water will evaporate and cause roof become cooler

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Charge acquired by a glass rod when rubbed with silk in_________ a) nagative b) positive c)neutral d)non of these

Posted by Lakshay Popli 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 4 years, 5 months ago

When glass rod is rubbed with silk, glass happens to lose electrons easily and silk grabs them away from the glass atoms. So after rubbing, the glass becomes positively charged and the silk becomes negatively charged.
Thus equal but opposite charge are produced on the both.

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What is Bacteria

Posted by Pratyaksh Rana 4 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Vaibhav Kumar 4 years, 5 months ago

Bacteria is a microscope organism it can't be seen with our naked eyes it is it is unicellular organism it is found everywhere like on soil human body any surfaces it need a better moisture temperature for its survival and does not have any shape size

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Shraddha Pal 4 years, 5 months ago

Bacteria is a unicellular Organism. It is found in soil, air, water. It is also found in human body. It has no shape.(eg.- amoeba)

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Abhishek Mishra 4 years, 5 months ago

Bacteria is a unicellular organism.it is mostly found in soil, air ,water etc.it has no definite shape.

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State the joules law and write its mathematical formula

Posted by Mrunalini Tavadare 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 5 months ago

Joule's law of heating states that when a current 'i' passes through a conductor of resistance 'r' for time 't' then the heat developed in the conductor is equal to the product of the square of the current, the resistance and time.

Power = electric energy

time

Power×time=electric energy

electric energy =P ×t

H=IR×It

H=I² Rt

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Matter is made up of small

Posted by Suman Yadav 4 years, 5 months ago

CBSE > Class 09 > Science

4 answers

Satinder Prashar 4 years, 5 months ago

Particles

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Vaibhav Kumar 4 years, 5 months ago

Matter are made up of small particles which can be called as element or atoms

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Rajesh Triapathi 4 years, 5 months ago

Particles

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Sunil Kumar 4 years, 5 months ago

Particle and atoms

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How to make notes of bio(fundamental unit of life

Posted by Manjoor Ahmed 4 years, 5 months ago

CBSE > Class 09 > Science

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That every object if it has less weight and

Posted by Hari Shankar Shekhar 4 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Hari Shankar Shekhar 4 years, 5 months ago

What ¿??????????????¿

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Distance and displacement define

Posted by Sudhir Singh 4 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Shaury Bharti 4 years, 5 months ago

The total movement of an object or a body without any regards to direction.

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Yogita Ingle 4 years, 5 months ago

Distance is the total movement of an object without any regard to direction. We can define distance as to how much ground an object has covered despite its starting or ending point.

Displacement is defined as the change in position of an object. It is a vector quantity and has a direction and magnitude. It is represented as an arrow that points from the starting position to the final position. For Example- If an object moves from A position to B, then the object’s position changes. This change in position of an object is known as Displacement.

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How do substance like carbon dioxide and water move in and out of the cell?

Posted by Manjiri Awchar 4 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Sanjay Sahani 4 years, 5 months ago

Here diffusion don't occur

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Sanjay Sahani 4 years, 5 months ago

By the process of osmosis

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Pranali Kulkarni 4 years, 5 months ago

By the process of diffusion

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Sandip Tamang 4 years, 5 months ago

Gyuuuu

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Differenciate between 1-scalar and vector quantity 2-reference point and position

Posted by Siya Sharma 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Ritik Varshney 4 years, 6 months ago

1- scaler quantity depends upon magnitude only but vector quantity depends upon magnitude and direction both.scaler quantity is always positive and vector positive or negative both

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Why is cell called the structural and functional unit of life ?

Posted by Abhinay Badal 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Ritik Varshney 4 years, 6 months ago

Because it is the special building block of all living beings.

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Alauddin Mollah 4 years, 6 months ago

because all the body of living is made up by cell so, there is why is called the structural unit of life and it's called the functional unit of life because all physological and biological chemical path way lead by cell so ,there is why is called functionul unit alsoo.

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WhaT is neutralising

Posted by Sameer Kumar Pal 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

When acids and bases react, they result in the formation of salt and water as product and this reaction is called neutralization reaction. In our everyday life we come across many situations which involve neutralization reactions. The following examples will illustrate common neutralization reactions that occur around us.

During indigestion, too much of acid is produced inside the stomach resulting in stomach disorder or acidity. In order to retrieve the pain we take bases such as milk of magnesia which contains magnesium hydroxide. Taking a base neutralizes the effect of excess acid.

Second is the effect of ant sting which is caused by formic acid which is neutralized by rubbing moist baking soda (basic in nature) which contains zinc carbonate.

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What are physical and chemical changes mean . Write five example of each

Posted by Nitika Sharma 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

In a physical change, the molecules are rearranged while their actual composition remains same

Some example of physical change are freezing of water, melting of wax, boiling of water, etc.

In a chemical change, the molecular composition of a substance completely changes and a new substance is formed.

A few examples of chemical change are digestion of food, burning of coal, rusting, etc.

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The position of an object can be described in terms of _and_

Posted by Gursimran Singh Chahalsaab 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Gursimran Singh Chahalsaab 4 years, 6 months ago

Answer

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Periodic test Page 74 answers

Posted by Gursimran Singh Chahalsaab 4 years, 6 months ago

CBSE > Class 09 > Science

0 answers

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26 degree convert at kelvin

Posted by Lucky Meher 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Alauddin Mollah 4 years, 6 months ago

Result in celcius scale = 26. And value of Kelvin scale = 273 by adding both value 26 + 273 = 299

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Alauddin Mollah 4 years, 6 months ago

For converting degree Celsius scale to kelvin scale you have need to add 273 to your celcius result and the result you get in kelvin like that ,;-)

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Jhunu Patra 4 years, 6 months ago

269

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Name the physical quantity which changes during uniform circular motion.

Posted by Ragini Amrutkar 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

B. Gowtham 4 years, 6 months ago

Velocity changes continuously during circular motion

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Yogita Ingle 4 years, 6 months ago

Velocity is the physical quantity which changes continuously during uniform circular motion and speed remains constant.

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Name the physical quantity which remains constant during uniform circular motion.

Posted by Ragini Amrutkar 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

Velocity is the physical quantity which changes continuously during uniform circular motion and speed remains constant.

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The smell of hot sizzling food reaches you several meters away,but to smell cold food we have to go close. Why?

Posted by Amritangshu Das 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 6 months ago

The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close because the kinetic energy of the particles of matter increases with the increase in temperature.

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what is space of molecule of dye colour

Posted by Om Vijay Walunj 4 years, 6 months ago

CBSE > Class 09 > Science

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Write the compsition of cell wall.

Posted by Jasjeet Singh Dhillon 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Sneh Anand 4 years, 6 months ago

cell wall is composed of protein ,pectin, cellulose

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Hari Shankar Shekhar 4 years, 6 months ago

Is mainly composed of cellulose and lignin it provides the cell cell which strength and rigidity

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What is the physical properties of metal?

Posted by Sachin Prasad 4 years, 6 months ago

CBSE > Class 09 > Science

6 answers

Sneh Anand 4 years, 6 months ago

metals are lustrous, ductile ( which can be transformed into wire, mellable ( which can transform into thin sheet)

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Hari Shankar Shekhar 4 years, 6 months ago

But diamond is non metal and it is harder than every other metal

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Hari Shankar Shekhar 4 years, 6 months ago

The physical property of metal is that their lustrous , Mellability ,ductility, sorrowness hardness and good conductors of heat and electricity

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Aryan Paramhans 4 years, 6 months ago

Solid in room temperature

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Anish Menghani 4 years, 6 months ago

They are sonorous also

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Palak Gupta 4 years, 6 months ago

The physical properties of metal are-: They are malleable They are ductile They are lustrous They are harder than non metals They are good conductors of heat and electricity, etc.

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What do the following measure in a car.

Posted by Joyati Rawat 4 years, 6 months ago

CBSE > Class 09 > Science