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Yogita Ingle 6 years, 1 month ago
length= 34m
Perimeter of square = 4(side)
= 4 (34)
= 136 m
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Yogita Ingle 6 years, 1 month ago
|
Square |
Rhombus |
|
The lengths of Diagonals of a square are of equal lengths. |
The lengths of Diagonals are of unequal length. |
|
All angles of Square are of 90 degrees each i.e. right-angled at each Vertex |
Only opposite angles of a Rhombus are of equal measure |
Posted by Jasmine Lalotra 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
Scratch is a block-based visual programming language and online community targeted primarily at children. Users of the site can create online projects using a block-like interface. The service is developed by the MIT Media Lab, has been translated into 70+ languages, and is used in most parts of the world.
Posted by Jasmine Lalotra 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
The cyclic movement of water from the atmosphere to the Earth and back to the atmosphere through various processes is called as water cycle.
Different steps of water cycle include evaporation, transpiration, condensation, precipitation and surface run-off.
a) Evaporation - The water present on the surface of oceans evaporates by the sun’s heat. This process of conversion of water from liquid state to vapour state is called evaporation. Evaporation also takes place from wet clothes, fields, ponds, lakes and rivers.
b)Transpiration - Plants take in water from the soil to prepare their own food and also for other life processes. They release excess water into air in the form of water vapour by the process of transpiration.
c) Condensation - The evaporated water is carried away by warm air. As the warm air moves higher from the surface of the Earth, it starts to cool down. This water vapour condenses to form tiny water droplets which float in air to form clouds or fog.
d) Precipitation - All these droplets collect to form bigger drops of water. Bigger water drops come down ads rain by the process of precipitation. If the air is too cold, the water drops can become snow or hail and may settle on the top of a mountain. When these snow or hail melts, they can become part of a river or a stream.
e) Surface run-off – Some amount of rain water is absorbed by the soil and settles down as ground water. Most of the rain water flows down the hills and mountains to collect into rivers, lakes or streams. Rain also washes away the topmost layer of the soil into water bodies.
This circulation of water through all these different factors is called as water cycle.
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Yogita Ingle 6 years, 1 month ago
A closed path through which the electric current flows is called an electric circuit. The direction of electric current in an electric circuit is from the positive terminal to the negative terminal. This is opposite to the direction of flow of electrons; which is from the negative terminal to the positive terminal.
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Yogita Ingle 6 years, 1 month ago
- Magnets are used inside TVs, Sound speakers and radios. The small coil of wire and a magnet inside a speaker transforms the electronic signal to sound vibrations.
- Magnets are used inside a generator to transform mechanical energy to electrical energy where there are other kinds of motors which use magnets to change electrical energy to mechanical energy.
- Electrically charged magnets can help cranes to move large metal pieces.
- Magnets are used in filtering machines which separates metallic ores from crushed rocks.
- It is also used in food processing industries for separating small metallic pieces from grains etc.
- Magnets are used in MRI machines which are used to create an image of the bone structure, organs, and tissues. Even magnets are used to cure cancer.
- At home, you use magnets when you stick a paper on the refrigerator in order to remember something. Attaching a magnetic bottle opener to the fridge can come in handy.
Posted by Rajpal Kaur 6 years, 1 month ago
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Yogita Ingle 6 years, 1 month ago
| Reversible changes | Irreversible changes |
| A substance can return to its original state. | A substance cannot return to its original state. |
| The chemical properties of the substance do not change. | The chemical properties of the substance change. |
| Most physical changes are reversible changes. | All chemical changes are irreversible changes. |
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Mr Cricket Man 6 years, 1 month ago
2Thank You