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Ask QuestionPosted by Bptilani Bptilani 7 years, 3 months ago
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Posted by Bptilani Bptilani 7 years, 3 months ago
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Meghna Thapar 5 years, 9 months ago
When petrol is dropped on the road during a rainy day, a thin layer of oil will appear on the water surface. Both the top and bottom surfaces of this oil film can reflect light. The wavelength corresponding to the constructive interference also differs and this causes the reflected light to have various colours. When a thin film of oil spreads over the surface of water and it is seen in broad day light, brilliant colours are seen. There colours arise due to interference of sun-light reflected from the upper and lower surfaces of the film. While bending of light rays at curvatures of obstacles, is called diffraction.
Posted by Bptilani Bptilani 7 years, 3 months ago
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Posted by Bobby Kataria 7 years, 3 months ago
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Nikita Maurya 7 years, 3 months ago
Posted by Ramchandra Patel 7 years, 3 months ago
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Posted by Bikash Pandey 7 years, 3 months ago
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Murugesan Anish 7 years, 3 months ago
Nitish Shukla 7 years, 3 months ago
Nikita Maurya 7 years, 3 months ago
Posted by Uour Wish 7 years, 3 months ago
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Posted by Prince Chauhan 7 years, 3 months ago
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Prince Chauhan 7 years, 3 months ago
Posted by Saourabh Singh 7 years, 3 months ago
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Nikita Maurya 7 years, 3 months ago
Posted by Sridharan.S Sridharan 7 years, 3 months ago
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Meghna Thapar 6 years, 1 month ago
There are three main types of combustion - rapid combustion, spontaneous combustion and explosive combustion.
- Rapid combustion: The combustion reaction in which a large amount of heat and light are produced in a short time is called rapid combustion. The immediate burning of cooking gas (LPG) in a gas stove to give heat and light is an example of rapid combustion.
- Spontaneous combustion: The type of combustion in which a material suddenly bursts into flames, without the application of any apparent cause is called spontaneous combustion. The spontaneous combustion reactions which take place in nature are very dangerous. Forest fires can be started by spontaneous combustion reaction.
- Explosive combustion: A very fast combustion reaction in which a large amount of heat, light and sound are produced, is called explosive combustion or explosion. The fireworks (crackers, etc.) which we explode during festivals work on the explosive combustion of substances.
Posted by Ankur Kumar 7 years, 3 months ago
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Posted by Ripudaman Jadoun 7 years, 3 months ago
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Hardik Agarwal 7 years, 3 months ago
Posted by Sachin Kumar 7 years, 3 months ago
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Posted by Kumud Kandpal 7 years, 3 months ago
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Posted by Sahil Khan 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
| Milk teeth | Permanent teeth |
| Start erupting after 6 months of birth and appear between 6 to 24 months | Begin to replace milk teeth in the 6 th year of age and usually completed by 24 years |
| Smaller, weaker and temporary | Stronger and permanent |
| 3 types (incisor, canine and molars) 8 incisors + 4 canines + 8 molars |
4 types (incisor, canine premolars and molars) 8 incisor+ 4 canine+ 8 premolars + 12 molars |
Posted by Tejashvi Pathak 7 years, 3 months ago
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Posted by Tejashvi Pathak 7 years, 3 months ago
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Posted by Shobha Vasu 7 years, 3 months ago
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Hardik Agarwal 7 years, 3 months ago
Posted by Harsh Gupta 7 years, 3 months ago
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Anamika Singh 7 years, 3 months ago
Posted by Pritam Kumar 7 years, 3 months ago
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Hardik Agarwal 7 years, 3 months ago
Posted by Elius Ahmed 7 years, 3 months ago
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Ripudaman Jadoun 7 years, 3 months ago
Posted by Ripudaman Jadoun 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
When electric current is passed through a conducting solution, some chemical reaction takes place. The resulting effects are called chemical effects of electric current.
Examples:
(i) When electric current is passed through water, water dissociates into hydrogen and oxygen.
(ii) When electric current is passed through the solution of a metal salt, such as solution of copper sulphate, metal gets deposited at the negative electrode, because metal is positively charged.
(iii) Sometimes, the colour of solution also changes when electric current passes through it.
Posted by Ripudaman Jadoun 7 years, 3 months ago
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Hardik Agarwal 7 years, 3 months ago
Posted by Gulshan Kumar 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Generally, adolescence begins at the age of 11 and lasts upto 18 or 19 years of age. Adolescents are also called teenagers because they cover the period of the 'teens' i.e. 13 to 18 or 19 years of age. or The years during adolescence period are counted as ‘teen’, .e.g. thirteen, fourteen and fifteen. Hence, this period is also called teenage.
Posted by Sitara Bano 7 years, 3 months ago
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Nitish Shukla 7 years, 3 months ago
Yogita Ingle 7 years, 3 months ago
Organisms that are so small that they can only be seen through a microscope are called microorganisms or microbes.
The study of microorganisms is known as microbiology. Microbiology is the study of a great variety of living organisms which are invisible to the naked eye like bacteria and fungi and many other microscopic organisms.
Posted by Ashutosh Mishra 7 years, 3 months ago
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Ripudaman Jadoun 7 years, 3 months ago
Posted by Sriram Kiran 7 years, 3 months ago
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Nitish Shukla 7 years, 3 months ago
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Hardik Agarwal 7 years, 3 months ago
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Posted by Manan Rawat 7 years, 3 months ago
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Hardik Agarwal 7 years, 3 months ago
Hardik Agarwal 7 years, 3 months ago
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Himani Kashyap 7 years, 3 months ago
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