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Ask QuestionPosted by Minku Yadv 5 years, 9 months ago
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Yogita Ingle 7 years, 5 months ago
Silver articles, when exposed to air become black after sometime. This is because the silver metal reacts with sulphur present in the atmosphere and forms silver sulphide. Thus, a layer of silver sulphide is formed on the surface of silver articles, because of which they appear dull and black.
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Bts Army 7 years, 5 months ago
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Sonali Aggarwal 7 years, 5 months ago
It is less reactive, less harmful and causes less pollution.
Posted by Nikhil Sharma 7 years, 5 months ago
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Bts Army 7 years, 5 months ago
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Yogita Ingle 7 years, 5 months ago
Take an emty plastic bottle and make 4 holes at the same heights on different sides.Fill the bottle with water,We can see that water rushes out through all the holes with equal pressure.This simple activity shows that liquid exert equal pressure on the walls of the container at a certain depth.
Posted by Anisha Yadav 7 years, 5 months ago
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Sonali Aggarwal 7 years, 5 months ago
The outer part of tooth is made up off a tissue called enamel, and enamel is made up off calcium.
Posted by Suman Subhadarshani 7 years, 5 months ago
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Posted by Riddhi Agarwal 7 years, 5 months ago
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Yogita Ingle 7 years, 5 months ago
Sometimes we see cooking oil in a frying pan catching fire when the frying pan is kept on the burning gas stove for a long time. This happens because the cooking oil gets heated to its ignition temperature when kept over a burning stove for a long time.
Posted by Aman Mishra 7 years, 5 months ago
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Yogita Ingle 7 years, 5 months ago
Pests:
- Insects that attack crops and damage them are called pests.
- Pests can be controlled by pesticides which are poisonous chemicals. Pesticides kill pests as well as their eggs and larvae but do not affect the plants.
Posted by Mohit Kumar 7 years, 5 months ago
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Yogita Ingle 7 years, 5 months ago
Zygote
- It is a fertilized egg formed after the fusion of the sperm with the egg.
- It is a stage of the embryo that shows all the main recognizable body parts of a mature organism.
- It contain only one cell.
Foetus :
- The zygote divides several times to form an embryo.
- An embryo gradually develops into a foetus.
- It contain many cell.
Posted by Soniya Chopra 7 years, 5 months ago
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Posted by Mukesh Yadav 7 years, 5 months ago
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Yogita Ingle 7 years, 5 months ago
The tribal groups were considered important people, because it is they who controlled their territories. Under the British rule they lose their administrative power and were forced to follow law made by British officials in India. Before the British arrived, tribal chiefs were important people; they had some money and the right to manage their lands and people.
Posted by Vishwa Savaliya 7 years, 5 months ago
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Yogita Ingle 7 years, 5 months ago
Magnifies: the image produced by the objective lens usually by 5x or 10x
Body tube: supports the revolving nose piece and ocular lens allows light to pass from the objective lens up through the ocular lens.
Coarse Focus Knob: moves the stage up and down for clear focusing off the specimen.
Fine Focus Knob: provides a sharper focus specimen under the medium and high power objective lenses.
Revolving Nose Piece: Holds the three objective lenses and rotates them allowing the required lens to be put in position over the specimen.
Arm: Supports the body tube.
Diaphragm: Different sized openings control the amount of light passing through the specimen
Posted by Rishu Mansare 7 years, 5 months ago
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Meghna Thapar 5 years, 7 months ago
A proton is a subatomic particle found in the nucleus of every atom. The particle has a positive electrical charge, equal and opposite to that of the electron. ... Protons need not be confined to the nuclei of atoms. Definition of proton. : an elementary particle that is identical with the nucleus of the hydrogen atom, that along with the neutron is a constituent of all other atomic nuclei, that carries a positive charge numerically equal to the charge of an electron, and that has a mass of 1.673 × 10−27 kilogram.
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