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The law of conservation of Mass states that Mass can neither be created nor destroyed in a chemical reaction but can be changed from one form to another.

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विद्युत का सबसे अच्छा चालक कौन सी धातु है

Posted by Mahendra Yadav 3 years, 10 months ago

CBSE > Class 09 > Science

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Sia ? 3 years, 10 months ago

विद्युत चालक (electrical conductors) वे पदार्थ है जिनसे होकर विद्युत धारा सरलता से प्रवाहित होती हैं। ताँबा, अलुमिनियम, जस्ता, सोना, चाँदी आदि विद्युत चालक हैं।

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Fun function of plastid

Posted by Amit Kumar Rai 3 years, 10 months ago

CBSE > Class 09 > Science

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M.C.Q of history Events and processes

Posted by Divya Chouhan 3 years, 10 months ago

CBSE > Class 09 > Science

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which of the following statement is not true about the compound? a)element are combined chemically to form a compound b)the constituents lose their properties c) the constituents can be separated by simple physical methods d) a compound is always homogeneous in nature

Posted by Kanika B Dudy 3 years, 10 months ago

CBSE > Class 09 > Science

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Sia ? 3 years, 10 months ago

a compound is always homogeneous in nature

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What is the atomic no of chloride?

Posted by Nikhil Gurjar 3 years, 10 months ago

CBSE > Class 09 > Science

5 answers

Yuktii Sharma 3 years, 10 months ago

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Dakshata K 3 years, 10 months ago

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Nitish Yadav Nitish Yadav 3 years, 10 months ago

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Deepanjali Deepanjali 3 years, 10 months ago

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Shalini Chouhan 3 years, 10 months ago

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A ball is thrown up with a velocity of 20m/s^-1 what is the time taken of the flight, neglecting the air resistance

Posted by Raj Shree 3 years, 10 months ago

CBSE > Class 09 > Science

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Sia ? 3 years, 10 months ago

Given:-

Velocity of the ball through which it is thrown

Acceleration due to gravity (g)

To find:-

The time of the flight, neglecting the air resistance.

Solution:-

When the body comes back to the initial position, the displacement s = 0

We know that,

s = ut – 1/2gt

s = ut – 1/2gt 0 = ut – 1/2gt ut = 1/2gt

t = 2u/g. Here ‘t’ is the time of flight, i.e.,

Therefore, Time of flight, t =

Thus, time of flight neglecting the air resistance=4s

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What do you mean by free fall ?

Posted by Ganesh P 3 years, 10 months ago

CBSE > Class 09 > Science

3 answers

Ganesh P 3 years, 10 months ago

When an object fall from high.there should act only one type of force that is gravitation force of earth.except gravitation force of earth no other force should have applied on the object

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Ganesh P 3 years, 10 months ago

It is the object falling towards earth under the influence of attraction force of earth or gravity.

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Ganesh P 3 years, 10 months ago

Gravity of the earth attracts every object towards its center. When an object is dropped from a certain height,it begins to fall towards earth's surface under the influence of gravitational force.such a motion of object is called free fall

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How I make project file on topic animal and plant cell ??

Posted by Sayli Mane 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Ganesh P 3 years, 10 months ago

Take a chart make like a file ,Take two a4 sheet and draw the cell diagram make it colorfully and submit (don't forget to design)

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Cell is a dynamic place justify

Posted by Janvi Tyagi 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Param Sidhu 3 years, 10 months ago

Cell is a dynamic place because one or other activity inside the cell is happening they move from one place to place undergoes repairs and so on

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Jyotishna Rajawat 3 years, 10 months ago

The living cell can be considered as a dynamic state because it interacts with the outer living world. Cell consists of many organelles like ribosome, mitochondria, golgi apparatus, lysosome, endoplasmic reticulum, etc. These organelles have their own functions.

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MCQ want

Posted by Sunny Singh Sunny Singh 3 years, 11 months ago

CBSE > Class 09 > Science

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Bowman, s capsule

Posted by Manju Kanwar 3 years, 10 months ago

CBSE > Class 09 > Science

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Preeti Dabral 3 years, 10 months ago

Bowman's capsule is a part of the nephron that forms a cup-like sack surrounding the glomerulus. Bowman's capsule encloses a space called “Bowman's space,” which represents the beginning of the urinary space and is contiguous with the proximal convoluted tubule of the nephron.

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60mcqs questions of physics

Posted by Pinki Kumari 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Sahil Singh Rajput 3 years, 11 months ago

Maam

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Define Endoplasmic Reticulum.

Posted by Riju R 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Sayli Mane 3 years, 11 months ago

Endoplasmic reticulum is a network of membranes inside a cell through which proteins and other molecules move. ✨ There are two type of Endoplasmic reticulum : 1 smooth endoplasmic reticulum 2 rough endoplasmic reticulum

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The cell appear elongated, tapering at ends as observed under a microscope. It is a. sclerenchyma fibre b. striped muscle c. parenchyma d. nerve cell

Posted by Rishika Agawal 3 years, 11 months ago

CBSE > Class 09 > Science

3 answers

Aarya . 3 years, 10 months ago

Nerve cell

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D K 3 years, 11 months ago

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Priyanshu Anand 3 years, 11 months ago

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Explain mass

Posted by Rishipal Singh 3 years, 11 months ago

CBSE > Class 09 > Science

3 answers

Ganesh P 3 years, 10 months ago

Mass is the fundamental attribute of any physical body. All the objects have a matter inside them and the measurement of the matter is the mass. The total mass of the system is assumed to be constant. This means that the mass remains unaffected by the gravitational field strength, regardless of the location, the object or person is in. Mass has a magnitude that is usually measured in kilogram and gram. Therefore, it is a scalar quantity. We are on earth and we measure things on earth with earth's gravity. If your weight is 70 kg which means you weigh 70 kg and the scale would read it 70kg or 154 lbs. Mass Definition Mass is defined as the measure of the matter inside a body. In physics, mass is a quantitative measurement of inertia. Let’s understand the concept of mass by understanding Newton's second law. For example, a body of mass, ‘m’ is moving with an acceleration ‘a.’ The force, ‘F’ is applied to the body given by, F = m . a Here, mass is a measure of its resistance to acceleration when a force is applied on to the body. Therefore, greater the mass of a body, the minimum change produced by an applied force. Mass Meaning Mass is referred to as the amount of matter contained in a body. For example, a human body has bones, muscles, tissues, RBC, WBC. As combined, they form a body’s mass. A person or object may be weightless on the moon because of lack of gravity while he maintains the same mass at all places without considering his location.

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Priyanshu Anand 3 years, 11 months ago

1) The S.I unit of mass is "kg" 2) Mass of any object doesn't change in any condition 3) mass is measured by balance and spring balance .

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Sarthak Gupta 3 years, 11 months ago

Mass is the quantity of matter present in a substance its formula is W/g

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36g of sodium chloride is dissolved in 100g of water at 293k .find its concentration at this temperature

Posted by Anjali Yadav 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Sarthak Gupta 3 years, 11 months ago

36/136 * 100 = 26.4%

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Sanchita Soni 3 years, 11 months ago

36/136×100 =>9/34×100 =>900/34

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Why is chemistry a subject

Posted by Arpit Singh 3 years, 11 months ago

CBSE > Class 09 > Science

3 answers

Ganesh P 3 years, 10 months ago

Chemistry is often referred to as the central science because it joins together physics and mathematics, biology and medicine, and the earth and environmental sciences. Knowledge of the nature of chemicals and chemical processes therefore provides insights into a variety of physical and biological phenomena.

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D K 3 years, 11 months ago

Because in chemistry you are study about properties and behaviors matter

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Rishipal Singh 3 years, 11 months ago

Something which we need to study it becomes a subject

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Bark of tree is made up of which tissue

Posted by Nothing Is Best 3 years, 11 months ago

CBSE > Class 09 > Science

5 answers

Sweety Yadav 3 years, 11 months ago

Cork

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Sweety Yadav 3 years, 11 months ago

Bark (protective tissue )

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01_Aadeet Pataliya_Ix-B 3 years, 11 months ago

Scalernchyma

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Shiva Singh 3 years, 11 months ago

Photosynthesis

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Shivam Kumar 3 years, 11 months ago

Scleranchyma

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What is the difference between 18g of CH4 and 18 g of CO4

Posted by Parineeti Singh 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Param Sidhu 3 years, 10 months ago

There are many differences such as their chemical entities and number of moles number of moles in 18 gram of ch4 are more as compared to 18 g of co4 in chemistry same weight or mass doesn't mean they are are equal

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Vishal Singh 3 years, 11 months ago

No of moles in 18g of CH4 has more than CO2

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What is air ?? Mixture or compound.

Posted by Atharva Dum 3 years, 11 months ago

CBSE > Class 09 > Science

5 answers

Priyanshu Anand 3 years, 11 months ago

Mixture

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Vishal Singh 3 years, 11 months ago

Mixture

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Nitin Sharma 3 years, 11 months ago

Mixture

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Dnyan Khambadkar 3 years, 11 months ago

Mixture

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Rishika Rawat 3 years, 11 months ago

Solution: Air is a mixture and not a compound because: Air does not have a formula like a mixture, while compounds have a fixed formula. When air is formed by gases, there is no energy change. Properties of air are variable and subjective to time and place.

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State law of conservation of momentum. Give examples

Posted by Priyanka Kumari 3 years, 11 months ago

CBSE > Class 09 > Science

4 answers

Vishal Singh 3 years, 11 months ago

Total momentum before collision=total momentum after collision.

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Dnyan Khambadkar 3 years, 11 months ago

Mometum. Before Collision =Momentum After Collision

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Rishika Rawat 3 years, 11 months ago

An example of law of conservation of momentum is Newton's cradle, a device where, when one ball is lifted and then let go, the ball on the other end of a row of balls will push upward. ...

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Naveen Sharma 3 years, 11 months ago

Law of conservation of momentum shows that a object will remain in motion until any external force is not applied example : cradle .

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What is mean by gravitation

Posted by Usha Suresh 3 years, 11 months ago

CBSE > Class 09 > Science