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

Health is described as the state of complete physical, mental and social well being. Thus, being healthy means that one feels good physically, has a positive outlook and is able to cope with social and mental pressures without much difficulty.

We need to be happy in order to be truly healthy, and if we mistreat each other and are afraid of each other, we cannot be happy or healthy. Social equality and harmony are therefore necessary for individual health.

Thus the conditions necessary for good health are:

Steps to ensure sanitation.
Availability of clean drinking water.
Availability of adequate, nutritious food.
Social equality and harmony.

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What is fat of nitrogen

Posted by Sahil Khan 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Ayus Agarwal 7 years, 1 month ago

It has 7 electrons and 7 protons,because its atomic mass is 7

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Can reverberation be avoided by removing obstacles so that the sound waves get enough way to travel?

Posted by Jyoti Yadav 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Sonu Raj Bhaskar 7 years, 1 month ago

Yes , reverberation can be avoided by placing soft and shock absorbing objects so that wave travels longer distance and can not reverberate

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Shreyansh Sharma 7 years, 1 month ago

No because it can be reflected from any hard surfaces..in day to day actiitives,when we go to a large hall we heard the repeated sound many a times When we produce any sound

1Thank You

Avneet Bhatia 7 years, 1 month ago

1Thank You

ANSWER

How can we avoid reverberation?

Posted by Jyoti Yadav 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Ramsha Khan 7 years, 1 month ago

We can avoid reverberation by using absorbing material like plants, heavy curtains,cushions seat and carpets in auditorium..

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K Shanmukh 7 years, 1 month ago

By taking rough uneven surface

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ANSWER

Drawbacks of neil bohr theory

Posted by Hanuman Singh 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Ramsha Khan 7 years, 1 month ago

Drawbacks of Rutherford either Thomsan ke ho sakte h bohr ki drawbacks nhi h humare chapter

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Shreeya Gupta 7 years, 1 month ago

there are no drawbacks of Neil bohr model sorry I can give answer its wrong question

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ANSWER

Is heil bohr theory of atom is coreeect?

Posted by Hanuman Singh 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Avneet Bhatia 7 years, 1 month ago

Yeah sure

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Shreeya Gupta 7 years, 1 month ago

yes Neil bohr theory of atom is correct

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Write a method to separate different gases from air

Posted by Mithilesh Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Chiraju Goyal 7 years, 1 month ago

Fractional distillation

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Tanmay Sharma 7 years, 1 month ago

Fractional dustillation

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Ramsha Khan 7 years, 1 month ago

Distillation

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Lakshita Singh 7 years, 1 month ago

Fractional distillation

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ANSWER

Change k - c

Posted by Sonu Pal 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Senthil Kumaran A.Balakrishnan 7 years, 1 month ago

By giving more prrssure to air and supply the cold freezing water to pass throught it and the nitrogen argon will be seperated at -186.C and at last Oxygen will be separated and it is in the form of liquid oxygen

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ANSWER

Give me the nitrogen cycle

Posted by Vilas S D 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

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What is net accelerating force

Posted by Manoj Kumar Singh 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is er

Posted by Aditya Mishra 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Aditya Raghav 7 years, 1 month ago

It is the only organalle which serve as a channel for the transport of materials between various regions of cytoplasm and between cytoplasm and nucleus * it forms endoskeleton of cells . * it helps in synthesis of fats, proteins, steroids etc.

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Senthil Kumaran A.Balakrishnan 7 years, 1 month ago

Er stands for Endoplasmic reticulum

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Ankit ?? Kumar 7 years, 1 month ago

It is large network of membrane bound tubes and sheets

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ANSWER

Why is the weight of an object on the moon 1/6th its weight on the earth

Posted by Krishan Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

Mass of the moon is 1/100 times and radius of moon is 1/4 times that of the earth.
Therefore, the gravitational attraction on the moon is about one sixth of that on the earth. Hence, the weight of an object
on the moon is 1/6 th of the weight on the earth.

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ANSWER

Why striated muscles are also known as skeletal or voluntary muscles

Posted by Shoaib Idrishi 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Avneet Bhatia 7 years, 1 month ago

Because striated muscles are attached to the bones and responsible for the body movement that's why it is also called skeletal muscles. Striated muscles work according to their will that's why it is called voluntary muscles

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What is oscillation?

Posted by Sweety Beauty Queen 7 years, 1 month ago

CBSE > Class 09 > Science

5 answers

Aditya Raghav 7 years, 1 month ago

To and fro motion of an object.

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Paras Sharma 7 years, 1 month ago

The movement of an object in back and forth direction is called o e oscillation

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Aditya Sharma 7 years, 1 month ago

The movement of a object from A to B then B to C and then again C to A

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Krishan Kumar 7 years, 1 month ago

The move ment of molecule through a region of high concentration to a low concentration area

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The Ultimate One 7 years, 1 month ago

A complete to and fro motion is called oscillation

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ANSWER

What is ozone and how is it different foams o²

Posted by Debanjan Paul 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Viren Tyagi 7 years, 1 month ago

Ozone is made by o3 and it is help to protect sun harmful light

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Sweety Beauty Queen 7 years, 1 month ago

The molecule containing three atoms of oxygen is ozone

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ANSWER

What is the work of plasma membrane

Posted by Mayank Mathur 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Ankit ?? Kumar 7 years, 1 month ago

It regulates the movement of substances in and out of the cell 2. It separate the contents of the cell from external environments

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The Ultimate One 7 years, 1 month ago

Also known as cell membrane it is the floor at which all the organelles are situated

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Tushnik Patra 7 years, 1 month ago

In carrying the process of diffusion and osmosis.

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What is positive work

Posted by Ayushi Pandey 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sweety Beauty Queen 7 years, 1 month ago

if the object moves in the direction of force applied then the work done is said to be positive

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Define endoosmosis

Posted by Ayushi Pandey 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Ankit ?? Kumar 7 years, 1 month ago

In this process, cell engulf food and other materials from its external environment due to flexibility of cell membrane

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Anshika Singh 7 years, 1 month ago

Endosmosis is the osmotic entry of water into a cell or system due to presence of hypotonic solution on the outside

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Differentiate b/w smooth and started muscle

Posted by Ayushi Pandey 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Ayushi Pandey 7 years, 1 month ago

Incorrect

1Thank You

Sarika Kapur 7 years, 1 month ago

It is smooth and straited muscle

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Sarika Kapur 7 years, 1 month ago

Your question is wrong

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Vilyan kise kehte hai

Posted by Ayushi 07 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

Explain mole number.

Posted by Kaustav Borah 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Chiraju Goyal 7 years, 1 month ago

1 mole =6.022×10^23

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Sharukh Surf 7 years, 1 month ago

The mole (abbreviated mol) is the SI measure of quantity of a “chemical entity,” such as atoms, electrons, or protons. It is defined as the amount of a substance that contains as many particles as there are atoms in 12 grams of pure carbon-12. So, 1 mol contains 6.022×1023 elementary entities of the substance.

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What is rutherford sir j.j Thomson

Posted by Neeraj Soni 7 years, 1 month ago

CBSE > Class 09 > Science