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There are some uses of ultrasonic waves: 1. In sonography. 2. In ultrasound in hospitals. 3. To see the growth of foetus in mother's womb. 4. To see the things underwater.

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Name any cell organelle which is nonmembranus.

Posted by Vivek Mishra 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sirsti Sngm 7 years, 1 month ago

Ribosome

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Define composite fish culture, write its merits and demerits?

Posted by G D 7 years, 1 month ago

CBSE > Class 09 > Science

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Explain why bats use ultrasound waves to catch a pray

Posted by Rajneesh Sharma 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Khiladi Bhai 7 years, 1 month ago

They cannot see

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On what factors the weight of body depend . Can a body have mass but no weight

Posted by Dev Barella 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sk Kumar 7 years, 1 month ago

Weight of a body depends on both mass and acceleration due to gravity (W=mg). Yes a body have mass but no weight.

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Define the term diversity

Posted by Akhilesh Guleria 5 years, 11 months ago

CBSE > Class 09 > Science

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Kishan Kumar 7 years, 1 month ago

Diversity means the variety of living organisms present on a particular region. There are about 20 lac organisms known on the earth which differ from one another in external form,internal structure,mode of nutriton,habitat,etc.

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sound waves of wavelength X travel from a medium in which velocity is being metre per second into another medium and its velocity is 3 metre per second with what is the wavelength of sound lambra in the second medium

Posted by Piyush Sharma2409 7 years, 1 month ago

CBSE > Class 09 > Science

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Write adaptive feature of reptiles aves and amphibians

Posted by Sujal Gupta 7 years, 1 month ago

CBSE > Class 09 > Science

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What is the relation between small g and capital g?

Posted by Shekhar Sindhu 7 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Pranaw Kumar 7 years, 1 month ago

G stands for Newton's universal gravitational constant, whereas g stands for the acceleration due to gravity at a certain point. G = 6.67300 × 10-11 N.m2.kg-2, G is a constant throughout space and time and it is a scalar quantity. g = 9.8 m.s-2, g is acceleration due to gravity which is a variable quantity and a vector qualtity. According to Newton's law of universal gravitation the force of attraction between two bodies is given by F = GMm/r2 ---------- (i) From Newton's second law of motion the weight of a body of mass m is F = mg -----------------(ii) From (i) and (ii) mg = GMm/r2 or g = GM/r2 Note: g is a constant at a given location, which depends upon M and r.

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Student Student 7 years, 1 month ago

G is gravitational constant it's value is 6.67 × 10 to the power-11. Small g is acceleration due to gravity of earth. it's value is 9.8 m/s^2.

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Sneha Yadav 7 years, 1 month ago

g = Gm/d square

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Kanak Dulwani 7 years, 1 month ago

Capital G is the gravitational constant but small g is the earth's gravitational force

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Whay whale are group of fish

Posted by Udayan Singh 5 years, 11 months ago

CBSE > Class 09 > Science

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Anashuman Singh 7 years, 1 month ago

Whales though swim in water, are grouped in mammalia and not picses because they have mammary gland, and give birth to babies.

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Which cause more cooling ,100c water , 100c steam

Posted by Himanshu Choudhary 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Pranaw Kumar 7 years, 1 month ago

Yes absolutely 100cwater

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Shekhar Sindhu 7 years, 1 month ago

100cwater

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What is straited muscle

Posted by Savitri Pandey 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

Striated Tissue: Voluntary musclesare also called striated tissues. Thesemuscles are also called skeletal muscles as they are mostly attached to bones and help in body movement. Under the microscope, these musclesshow alternate light and dark bands orstriations when stained appropriately.

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Sexual reproduction

Posted by Ashutosh Chaturvedi 7 years, 1 month ago

CBSE > Class 09 > Science

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Sehrawat Sahab 7 years, 1 month ago

The process in which both individuals of opposite gender are involved is called sexual reproduction

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List three charcterstice feature of fungi

Posted by Md Gulzar 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Fungi are eukaryotic, non-vascular, non-motile and heterotrophic organisms.
They reproduce by means of spores.
Fungi exhibit the phenomenon of alteration of generation.
Fungi store their food in the form of starch.
Biosynthesis of chitin occurs in fungi.
The nuclei of the fungi are very small.
During mitosis, the nuclear envelope is not dissolved.

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Compare the properties of electron protrons and neutrons

Posted by Md Gulzar 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Siya Sharma 7 years, 1 month ago

Electron:- They have negatively charged ion. They embedded in an atom in small amount then protons Proton:- They have a positively charged ion. They embedded in a large amount in an atom than an electron. Neutron:- They have no charge. So, it is neutral They are present in the nucleus in very small amount.

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Final term sample paper

Posted by Mohd Shuhaib 7 years, 1 month ago

CBSE > Class 09 > Science

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Mitchocondrio

Posted by Shantanu Singh 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Account Deleted 7 years, 1 month ago

Mitochondria is known as the power house of the cell it stores the energy in the form of ATP

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Palak Gaba 7 years, 1 month ago

Mitochondria is known as powerhouse of cell brcause it generates energy to every part of cell.

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What is neagative work

Posted by Md Gulzar 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

If the force and the displacement are in opposite directions, then the work is said to be negative. For example if a ball is thrown in upwards direction, its displacement would be in upwards direction but the force due to earth’s gravity is in the downward direction.

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Anashuman Singh 7 years, 1 month ago

When the force and displacemt both are in the opposite direction, negative work is said to be done.

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Which postulate og dalton theory is result of law of constantproportion

Posted by Aashiq Sheikh 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

The law of definite proportion is also known as the law of constant proportion. This law states that in a compound, the elements are always present in definite proportions by mass’.
The postulates of Dalton’s atomic theory are as follows.

All matter is made up of very tiny particles. These particles are called atoms.
An atom cannot be divided further i.e., atoms are indivisible.
Atoms can neither be created nor destroyed in a chemical reaction.
All atoms of an element are identical in all respects, including the mass, chemical properties, etc.
Atoms of different elements have different masses and chemical properties.

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Why is the division Bryophyta known as the amphibians of Kingdom plantae?

Posted by Akanksha Kumari? 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

Amphibians are those organisms which live on both land and in water. Bryophytes are called amphibians of the plant kingdom because these plants though live in soil but they need water for sexual reproduction. The sperm of bryophyte (antherozoids) are flagellate and need water to swim to the eggs. In other words, as these plants need water for reproduction unlike other plants, they are called as amphibians.

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Anirudh Bhardwaj 7 years, 1 month ago

Because these plants can live both on land and water.

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Cells any part dicovered name with date and year

Posted by Ab Devillers 7 years, 1 month ago

CBSE > Class 09 > Science

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Derivation of F=ma

Posted by Atharva Pachpande 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sehrawat Sahab 7 years, 1 month ago

F = change in momentum /time F = m (v-u) /t. M-v/t =a (acceleration) F = ma

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How do annelid animals differ from arthro

Posted by Pushpam Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Annelids	Arthropods
The body is segmented, lined up one after the other from head to tall. This is called metameric segmentation.	Their body also have segments but lack complete metameric segmentation.
The true body cavity called ‘coelom’ is present.	The body cavity is present. It contains blood, so called ‘haemocoel’.
These are also called segmented worms.	These are commonly called ‘animals with jointed legs’.
Breathing occurs through the skin.	Breathing by gill, trachea, book lungs, etc.

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10 mole of sodium sulphite

Posted by K. Shakya 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sayoni Debnath 7 years, 1 month ago

780

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Who is the discover for proton

Posted by Ab Devillers 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

Ernest Rutherford is credited with the discovery of proton in 1920. The experiments that led to the discovery of protons were based on electrical discharge in modified cathode ray tubes. The observations revealed that these particles (protons) were positively charged. The rays carrying positively charged particles are also known as canal rays.

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Atharva Pachpande 7 years, 1 month ago

E Goldstein

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How to separate the mixture of sugar and water

Posted by Anish Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

The sugar would dissolve in water. You could then pour off the solution and wash the remaining sand with a bit more water. Heat the water to evaporate it from the sugar, and the two are separated.

Because you have not altered the sand or the sugar in a chemical way (the sugar always remains as sugar, and is reclaimed in the same form), these were physical changes.

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Midhun Das 7 years, 1 month ago

Evaporation

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Explain How sound is produce How from a school ball ?

Posted by Dinesh Sahu 7 years, 1 month ago

CBSE > Class 09 > Science