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A substance has no mass. Can we consider it as matter?

Posted by Parth Dariyani 5 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Akshat Holland Minettee 5 years, 1 month ago

No because anything that has mass and occupies space is only call matter.

Shweta Singh 5 years, 1 month ago

First of all it is not possible because everything in world has their own mass. But otherwise it happens then it will not come in the category of matter

Yogita Ingle 5 years, 1 month ago

Matter is defined as a substance or entity which has mass and occupy some space. So if a substance has no mass we cannot regard it as matter.

ANSWER

Suppose you want to convert a gas into a liquid. Which two methods can you apply

Posted by Parth Dariyani 5 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Suzanne Smitha 5 years, 1 month ago

1.condensation 2.increase temperature and decrease pressure

Yogita Ingle 5 years, 1 month ago

In order to convert a gas into a liquid, following methods can be chosen.

• Condensation or liquefying of the gases which is the process of converting gases into liquids.

• When you increase the temperature and decrease the pressure, the gaseous state is converted into liquid state on this impact.

ANSWER

Very short questions Which will have more density – a solid or a liquid give reason

Posted by Parth Dariyani 5 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Bhagyesh Kame 5 years, 1 month ago

Density is mass/volume. Since the solid have a compressed state it will have less volume resulting in more density. Where as in fluid the volume will be depending upon the shape of the container in which it is stored.

Anamika Gangurde 5 years, 1 month ago

Solid because liquid are tend to flow, they take the shape of the container on which they are kept. They do not have a definite shape, but solids molecules are very to each other ,and they Attract each other ( attract each molecules)toward them. Solid have a definite shape

Bangtan Army Forever 5 years, 1 month ago

Solid has more density because in solid, particles are more tightly packed with each other we take great interparticle force as compared to liquid which particles are less tightly packed with each other than solid .

ANSWER

Four examples of connective tissue in humans

Posted by Swarali Kadam 5 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Aarti Balu 5 years, 1 month ago

Four examples of connective tissues are tendon, cartilage, bone and Areolar.

Yogita Ingle 5 years, 1 month ago

Connective tissues, as the name implies, support and connect different tissues and organs of the body. They are widely distributed in every part of the body. They originate from the mesoderm (the middle germinal layer of the embryo)
It includes fibrous tissues, fat, cartilage, bone, bone marrow, and blood. As the name implies, connective tissues often bind other organs together, hold organs in place, cushion them, and fill space.

Read more: <a href="http://www.biologyreference.com/Ce-Co/Connective-Tissue.html#ixzz6SXpqSyPk">http://www.biologyreference.com/Ce-Co/Connective-Tissue.html#ixzz6SXpqSyPk</a>

ANSWER

Factor which is inversely proportional to the rate of evaporation

Posted by Parth Dariyani 5 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Bhagyesh Kame 5 years, 1 month ago

The factor inversely proportional to rate of evaporation is humidity. As humidity increases the rate of evaporation decrease. This is why it takes longer time for clothes to dry in rainy season as humidity is high in rainy season.

Yogita Ingle 5 years, 1 month ago

Factors That Affect the Evaporation

Temperature: As the temperature increases, the rate of evaporation also increases. Temperature and rate of evaporation are proportional to each other
Surface area: As the surface area increases, the rate of evaporation increases. The surface area and rate of evaporation are proportional to each other.
Humidity: The rate of evaporation decreases with an increase in humidity. Humidity and the rate of evaporation are inversely proportional to each other.
Wind speed: Increase in wind speed results in increased evaporation. Wind speed and rate of evaporation are proportional to each other.

ANSWER

What is the boiling point of water on Kelvin scale

Posted by Parth Dariyani 5 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Shree Kushwaha 5 years, 1 month ago

373.15 k

Divya Gupta 5 years, 1 month ago

373.15k

Piyushi Sharma 5 years, 1 month ago

373.15K

Yogita Ingle 5 years, 1 month ago

As boiling point of water in celcius scale is 100 degree celcius.
So as per formula K=273.15+c . As value of c is 100 degree celcius so its value be 373.15 K.

The boiling point of water in kelvin scale is 373.15 K.

ANSWER

What is dehyrogen monoxide

Posted by Dakshal Chauhan 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 5 years, 1 month ago

Dihydrogen monoxide (DHMO) is the scientific name for water, though it is almost never used. But the name is technically correct for water. It is a colourless, odourless, tasteless chemical compound and the major component of acid rain which is also known as hydroxyl acid. It also contributed to the greenhouse effect. It accelerates corrosion of many metals. Water is covalent compound, but dihydrogen monoxide is ionic so both are not the same.

ANSWER

A body started from a height of 10m with initial velocity 0. find out kinetic energy of body with out the formula (m=20 kg)

Posted by Dhanush M 5 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is the formula of angular velocity and momentum

Posted by Vedansh Bajaj 5 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Ekta Ekta 5 years, 1 month ago

Above answer are sufficient

Yogita Ingle 5 years, 1 month ago

Definition: The degree to which a body rotates, gives its angular momentum. It is defined as the product of the moment of inertia “I” and the angular velocity “ω”

L =Iω

Angular momentum in terms of Linear momentum can be written as

$L=r\times p$

where,

r = length vector

p = linear momentum

Ritika Sharma 5 years, 1 month ago

Angular velocity=wr(w means omega) Momentum=mv

ANSWER

Define diffrentiation

Posted by Rehyaa Arjun 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 5 years, 1 month ago

In reference to biology, Differentiation is a process in which cells, tissues, organs acquire certain characteristics and features which makes them specialized in the function they perform.

For example, differentiation of meristem into specialized cells and tissues like plants and stems.

ANSWER

A body travels with a uniform speed of 8m/s for 10s and then with a speed of 12m/s for 15s. Calculate its average speed.

Posted by Priyanshu Parate 5 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Aarti Balu 5 years, 1 month ago

Isn't 0.8m/s the right answer?

Ritika Sharma 5 years, 1 month ago

Speed=total distance/total time =10×8 + 12×15/10+15 =260/25 =10.4 m/s

ANSWER

Difference between RERand SER?

Posted by Jiya Pasare 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 5 years, 1 month ago

ROUGH ENDOPLASMIC RETICULUM	SMOOTH ENDOPLASMIC RETICULUM
These are rough at surface and are associated with ribosomes.	These are smooth at surface and are associated with Golgi bodies.
These are responsible for the synthesis of proteins and enzymes.	These are responsible for the synthesis of glycogen, lipids etc.
These provide structural framework for the cell.	These take part in the synthesis of fats in adipose cells.
These also act as channels for quick transport.	These can also detoxify drugs and some poisons.
These help in the synthesis of membranes.	These help in the formation of rhodopsin from vitamin A.

ANSWER

A body starts from rest and undergoes a uniform acceleration of 5m/s for 6 seconds. Calculate its final velocity and the distance travelled.

Posted by Priyanshu Parate 5 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Dakshal Chauhan 5 years, 1 month ago

30 m/s (Final velocity)

Ritika Sharma 5 years, 1 month ago

v=u+at =0+5×6(u=0 as body starts from rest) =30m/s(final velocity) v²-u²=2as v²-u²/2a=s (30)²-(0)²/2×5= s 900/10=s 90m=s

ANSWER

Draw a diagram of internal structure of chloroplast along with the explanation of chloroplast.

Posted by Jiya Pasare 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 5 years, 1 month ago

The chloroplast has an inner and outer membrane with an empty intermediate space in between. Inside the chloroplast are stacks of thylakoids, called grana, as well as stroma, the dense fluid inside of the chloroplast. These thylakoids contain the chlorophyll that is necessary for the plant to go through photosynthesis. The structure of the chloroplast is adapted to the function it performs: Thylakoids – flattened discs have a small internal volume to maximise hydrogen gradient upon proton accumulation. ... Photosystems – pigments organised into photosystems in thylakoid membrane to maximise light absorption.

ANSWER

What are the two components of biosphere

Posted by Vedika Bhatt 5 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Vedika Bhatt 5 years, 1 month ago

Thanks

Gaurav Seth 5 years, 1 month ago

The region on earth comprising of both biotic and abiotic components is called as biosphere.

1. Biotic components include all the living organisms. Living organisms comprise of plants, animals and microorganisms.

2. Abiotic components include air, water and the soil. Biotic components interact with all the abiotic components such as air, water and soil to sustain their life.

ANSWER

the rate of evaporation depends upon the surface area exposed to the atmosphere the temperature the humidity and the wind speed

Posted by Murtiram Joshi 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 5 years, 1 month ago

rate of evaporationdoes depend on surface area because if the surface area is more then their will be more contact to the environment so the bonds between the molecules would take lesser time to break but it also depends on nature of liquid,wind speed, humidity and temperature

ANSWER

Or

Posted by Rahul?⚾ Dhaka 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Farzaan Khan 5 years, 1 month ago

Bhai questions puchna hai toh puchna.

ANSWER

give some example of deposition process

Posted by Diyanshu Baghel 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 5 years, 1 month ago

Water vapor to ice - Water vapor transforms directly into ice without becoming a liquid, a process that often occurs on windows during the winter months.
Physical vapor to film - Thin layers of material known as "film" are deposited onto a surface using a vaporized form of the film.

ANSWER

What does the path of an object look like when it is in uniform motion?

Posted by Shourya Rajput 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 5 years, 1 month ago

q : What does the path of an object look like when it is in uniform motion?

A N S W E R :

An object is said to be in uniform motion if it moves with constant velocity i.e. the object must be moving in a straight line.

ANSWER

Why does space looks blue during day fromnp earth if it is because of reflection then image need screen to form but space is not any screen?

Posted by Harsh Vardhan 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Hanshika (Honey) 5 years, 1 month ago

I think because of Tyndall effect

ANSWER

Where are protien synthesized inside the cell?

Posted by Siddhi Vinayak 5 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Shree Kushwaha 5 years, 1 month ago

Ribosome

Aarti Balu 5 years, 1 month ago

In the ribosome

Ritika Sharma 5 years, 1 month ago

Ribosomes

Divya Gupta 5 years, 1 month ago

RNA is present in Ribosomes play a significant role in synthesizesing protein

Shabd Kumar 5 years, 1 month ago

In ribosomes

ANSWER

What are atoms ....defination please

Posted by Debasmita Deb 5 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Sumana Banerjee 5 years, 1 month ago

An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across. They are so small that accurately predicting their behavior using classical physics – as if they were billiard balls, for example – is not possible due to quantum effects. Current atomic models use quantum principles to better explain and predict this behavior.

Rd Campus 5 years, 1 month ago

Atoms are defined as “the basic building blocks of matter”. It is the smallest constituent unit of matter that posses the properties of the chemical element. Atoms don’t exist independently, instead, they form ions and molecules which further combine in large numbers to form matter that we see, feel and touch. Atoms are much too small to be seen; hence experiments to find out their structure and behavior have to be conducted with large numbers of them. From the results of these experiments we may attempt to construct a hypothetical model of an atom that behaves like the true atom.

Vallabh Pawar 5 years, 1 month ago

The spreading of fragrance of incense stick from a corner to the whole room indicates that particles of matter keep moving from higher to lower concentration.

Siddhi Vinayak 5 years, 1 month ago

Atoms is the smallest components of an element, characterized by a sharing of the chemical properties of the elements and a nucleus with neutrons protons and electrons.

ANSWER

Which of the following component added to water followed by vigorous stirring form a true solution, suspension or a collid -soap,femous sulphate,calcium carbonate,sodium chloride,starch and wheat flour.

Posted by Abhishek Aryan 5 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

If it takes 10s to round the boundary of square of 40meter how much distance it covers in 2 min and 20seconds

Posted by Monika Pawar 5 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Harsh Vardhan 5 years, 1 month ago

Speed=40/10=4m/sec distance =speed *time=4*140=560m

Vishal Ray 5 years, 1 month ago

10s=40m then 2min20seconds=140sec So 140x40=1600 Hope you like it is very simple

ANSWER

How does a living cell perform these basic functions

Posted by Tarini Sahu 5 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Bablu Kumar Jha 5 years, 1 month ago

Good

Gaurav Seth 5 years, 1 month ago

There is a division of labour in multicellular organisms such as human beings. This means that different parts of the body performs different functions. For eg. the human body has heart to pump the blood a stomach to digest and so on. Similarly the division of labour is also seen with a single cell. Each such cell has got certain specific components within it known as cell organelles. These organelles perform specific function for the cell.

ANSWER

The smell of incense stick spread in the whole room . which characteristic of particles of matter does it indicate.

Posted by Deepanshu Varshney 5 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Harsh Vardhan 5 years, 1 month ago

Diffusion

Akshat Holland Minettee 5 years, 1 month ago

That particles are in continuous motion and hence they possess an energy called kinetic energy. On application of heat the kinetic energy of the particles increases which then move more rapidly. The characteristic of particles of matter which it shows is that particles of matter diffuse

Vallabh Pawar 5 years, 1 month ago

The spreading of fragrance of incense stick from a corner to the whole room indicates that particles of matter keep moving from higher to lower concentration.

Yogita Ingle 5 years, 1 month ago

The spreading of fragrance of incense stick from a corner to the whole room indicates that particles of matter keep moving from higher to lower concentration.

ANSWER

What is proto plasma

Posted by Megha Sharma 5 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Sarita Panda 5 years, 1 month ago

Nucluse+Cytoplasm=Protoplasm

Yogita Ingle 5 years, 1 month ago

Protoplasm is defined as the organic and inorganic substances that constitute the living the nucleus, cytoplasm, plastids and mitochondria of the cell.
Protoplasm is the living part of the cell, which comprises of different cellular organelles. It is a jelly-like, colourless, transparent and viscous living substances present within the cell wall. The term protoplasm was proposed in the year 1835 and is known as the primary substance, as it is responsible for various living processes.

ANSWER

Structural organisation of cell

Posted by Payal Pal 5 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 5 years, 1 month ago

Cells have particular structures that perform specific jobs. These cell structures are called organelles and perform the actual work of the cell. These organelles are formed from many different molecules. Some functions carried out by organelles include the transport of materials, energy capture and release, protein building

Gaurav Seth 5 years, 1 month ago

CELL is the structural and functional unit of living organisms made up of protoplasm containing nucleus surrounded by cytoplasm and bounded by cell membrane.

*cell made up of protein , water ,lipid and carbohydrate.

STRUCTURAL ORGANISATION OF CELL

CELL consist of following structures

cell membrane
cell wall
cytoplasm
nucleus
endoplasmic reticulum
Golgi complex
mitochondria

ANSWER

What is the meaning of protoplasm

Posted by Anshara Tazeen Anshara Tazeen 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 5 years, 1 month ago

Protoplasm is the living contents of a cell that is surrounded by a plasma membrane. It is a general term for the cytoplasm.Protoplasm is composed of a mixture of small molecules such asions, amino acids, monosaccharides and water, and macromolecules such as nucleic acids, proteins, lipids and polysaccharides.

ANSWER

What are hermaphrodites .

Posted by Free Fire Gamer 5 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 5 years, 1 month ago

Hermaphrodites are those organisms in which the sexes are not separate i.e. both male and female reproductive organs occur in the same individual.
Example: Animals of phylum Platyhelminthes, such as liver fluke and blood fluke, are hermaphrodites.

ANSWER

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