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

For example, carbon would be denoted as C and oxygen as O. If elements had the same first letter, such as gold ( aurum ) and silver ( argentum ), Berzelius decided that the symbol would be the first two letters of the name: Thus, gold would be known as Au and silver as Ag.

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What is the difference between infectious and non infectious diseases?

Posted by Shatakshi Roy 7 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Deepanshi Joshi 7 years, 5 months ago

The disease which spread by contact or someone like cough,cold is called infectious disease .The disease which does not spread to each other is called non infectious disease .Example are AIDS etc

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Deepanshi Joshi 7 years, 5 months ago

Infectious diseases is from cough

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Samya Mukherjee 7 years, 5 months ago

The disease which spreads by contact with each other is called infectious disease. The disease which does not spread is called non infectious disease.

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Please please please give me ans. Very imp. for me = Explain how animals in vertebrate are classified into further subgroups?

Posted by Neha Panwar 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Palak ?? 7 years, 5 months ago

On the basis of their skin structure,hot or cold blooded,chambers in heart, respiration Through gills or lungs, reproduction pattern having mammary glands etc.

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Mention the values shows by nita

Posted by Vikash Chauhan 7 years, 5 months ago

CBSE > Class 09 > Science

0 answers

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If 3 ml of aceton is dissolve in 147 ml of water. What is its concentration (v/v).

Posted by Rahul Kumar 7 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Palak Genius 7 years, 5 months ago

2% ans

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Antima Garg 7 years, 5 months ago

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From which jelly like material does the ribosome get attached to the rough endoplasmic reticulum.

Posted by Rahul Kumar 7 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Rahul Kumar 7 years, 5 months ago

The right answer of these question is ribophorin.

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Neymar Jr 7 years, 5 months ago

Cytoplasm

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The radius of the earth is about 6400 km and that of mars is 3200 km and the mass of the earth is ten times the mass of the mars. An object weigh 200N on the surface of the earth then what is the weight of the same object on the suface of the mars

Posted by Rahul Kumar 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Shivam Singh 7 years, 5 months ago

I think near about 80N

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Name some edible fingies

Posted by Afreen Dudekula 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Samya Mukherjee 7 years, 5 months ago

Mushrooms.

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What is difference between maleria and dengu?

Posted by Ravishankar Kumar Sharma 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Rahul Kumar 7 years, 5 months ago

The first difference is that malaria is caused by female anelopheles mosquito while dengu is caused by Ades mosquito. The second one is that the casual organism of malaria is plasmodium while the casual organism of dengu is dengu virud

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Why do we fall ill (science)

Posted by Twinkle Mansi 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Miss Angel Barsha 7 years, 5 months ago

1st read the chapter, then only u can understand

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is pine example of gymnosperms

Posted by Sanjay Mehta 7 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 5 months ago

Gymnosperms

(i) The term gymnosperm is derived from two different words. They are

gymno– means naked and
sperma– means seed

(ii) The plants belonging to this group have naked seeds.
(iii) The plants of this group are generally perennial, evergreen and woody.
(iv) Examples of plants belonging to this group are pines and cycas.

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G B 7 years, 5 months ago

yes

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Define the term tissu

Posted by Nageshwar Chaurasiya 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 5 months ago

A tissue is a group of cells that have a similar structure and act together to perform a specific function.

Different types of tissues can be found in different organs. In humans, there are four basic types of tissues:

Epithelial tissues
Connective tissues
Muscular tissues
Nervous tissue tissues

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Prepare a frequency chart on types of sound waves. ( in the tabular form ) Types of sound, frequency, audible to

Posted by Rajeshwari Sonu 7 years, 5 months ago

CBSE > Class 09 > Science

0 answers

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Describe the relative density

Posted by Anand Verma 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Priyanshu Sahu 7 years, 5 months ago

Relative density means that density is more when object's mass is more and density is less of object when object's mass is less.

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State the function of melanine

Posted by Shivam Singh 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

An informal survey of my colleagues revealed that most dermatologists believe the primary function of melanin in humans is to act as a sunscreen to protect us from ultraviolet (UV) radiation in sunlight

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Flotation chapter note

Posted by Aditya Prakash 7 years, 5 months ago

CBSE > Class 09 > Science

0 answers

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Difference between g and G (ch-gravitation)

Posted by Kannupreet Kaur 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Rahul Kumar 7 years, 5 months ago

The difference between 'g' and 'G' are as follows: 1. G is always constant every where but 'g' is not costant 2.G is scalar quantity but 'g' is vector quantity.

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What is an average power ?

Posted by Sandhiya Suresh Sandhiya Suresh 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 4 months ago

Average power of a body is defined as the ratio of the total work done by the body to the total time taken.
Power = Energy consumed/ Time taken = work done / Time

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What is si unit ofgravity

Posted by Bambhaniya Jay Jay 7 years, 5 months ago

CBSE > Class 09 > Science

7 answers

Samya Mukherjee 7 years, 5 months ago

The unit of gravitational force between two objects is Newton

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Samya Mukherjee 7 years, 5 months ago

There is no exact unit of gravity. The unit of gravitational acceleration is m/s square

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Bambhaniya Jay Jay 7 years, 5 months ago

I know what is rightunit

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Bambhaniya Jay Jay 7 years, 5 months ago

Newton is a unit of force

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Aditya Prakash 7 years, 5 months ago

Newton

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Sandhiya Suresh Sandhiya Suresh 5 years, 11 months ago

Newtoh

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Om Shankar 7 years, 5 months ago

Newton

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Is there anybody from hansraj public school in panchkula

Posted by Aditya Sharma 7 years, 5 months ago

CBSE > Class 09 > Science

0 answers

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What is the si unit of kinetic and potential energy

Posted by Bambhaniya Jay Jay 7 years, 5 months ago

CBSE > Class 09 > Science

5 answers

Jaismeen Kaur 7 years, 5 months ago

Hey user!! Here is your answer... 1 joule Hope this will help you Thanqu

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Shravan Kumar 7 years, 5 months ago

Joule

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Sandhiya Suresh Sandhiya Suresh 7 years, 5 months ago

Joule

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Aditya Sharma 7 years, 5 months ago

Kinetic energy ka joules hai

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Bambhaniya Jay Jay 7 years, 5 months ago

1 JOULe

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Ozone layer found in which ĺayer of earth....

Posted by Siddharth Gautam 7 years, 5 months ago

CBSE > Class 09 > Science

3 answers

Miss Angel Barsha 7 years, 5 months ago

Stratosphere

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Samya Mukherjee 7 years, 5 months ago

Previous answer is wrong. The answer is stratosphere.

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Aditya Sharma 7 years, 5 months ago

Trophosphere

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What is the slowest animal in the world?

Posted by Josuva Anand 7 years, 5 months ago

CBSE > Class 09 > Science

5 answers

Josuva Anand 7 years, 5 months ago

Sloth

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Sudeepti Sharma 7 years, 5 months ago

Bumblebee bat

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Soupati Bhanuja 7 years, 5 months ago

Snail

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Ashutosh Chaurasia 7 years, 5 months ago

Snail

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Aditya Sharma 7 years, 5 months ago

Turtle

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What is "G" and "g" in gravitation chapter physics

Posted by Shriti Gangil 7 years, 5 months ago

CBSE > Class 09 > Science

5 answers

Shikhar Pandey 7 years, 5 months ago

G is a constant known as gravitational constant

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Soupati Bhanuja 7 years, 5 months ago

"G" means the gravity of bigger object that is earth ."g" refers to the gravity of smaller object on earth

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Aditya Sharma 7 years, 5 months ago

Sorry 9.8 m/s square...but u can also write 10 to make calculation easy....it is not wrong

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Aditya Sharma 7 years, 5 months ago

G is 6.67x10 raise to power -11.....and g is 9.7m/s square

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Josuva Anand 7 years, 5 months ago

G-gravity of earth g-gravitational force

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How to calculate value of g

Posted by Akshat Burnwal 7 years, 5 months ago

CBSE > Class 09 > Science

1 answers

Aditya Sharma 7 years, 5 months ago

To calculate the value of g ....u have to put the value of G...R...and M....in g=GxM/R square.......it will come out 9.8 m/s square

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Define. HIERARCHY

Posted by Aditya Chandel 7 years, 5 months ago

CBSE > Class 09 > Science

0 answers

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Its TACHYON particle which was discovered by an indian scientist.He also disproved EINSTEINs theory by doing this dicoverry?

Posted by Amidhi Jain 7 years, 5 months ago

CBSE > Class 09 > Science

0 answers

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Explain 3 kepler's law

Posted by Rajeshwari Sonu 7 years, 5 months ago

CBSE > Class 09 > Science

2 answers

Miss Angel Barsha 7 years, 5 months ago

What do you mean kepler's 3 laws or kepler's 3rd law

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Yogita Ingle 7 years, 5 months ago

Kepler’s third law
Kepler’s third law, the law of periods, defines the relationship between the orbital period of a planet and the average radius of its orbit. The orbital period of a planet, denoted by T, is the time taken by the planet to make a complete revolution around the sun along its orbit.
The average radius of the orbit of a planet is also the mean distance of the planet from the sun.
The law of periods states that the square of orbital period, T, of a planet is proportional to the cube of its mean distance, R, from the sun.
The law of periods can be expressed as T² α R³.

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an element a has a valency 4 what will be the formula of its chloride what will be the formula of sulphide state the formula of an oxide of an element e when its valency is 3

Posted by Zainab Kheraj 7 years, 5 months ago

CBSE > Class 09 > Science