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Meghna Thapar 5 years, 10 months ago
Effects of Force:
- A force can move a stationary body. For example if we kick a football kept on the ground with our foot, then the football starts moving.
- A force can stop a moving body. For example the football moving on the ground stops after sometime due to force of friction of ground.
- A force can change the speed of a moving body. For example if someone pushes the moving bicycle from behind then the speed of the bicycle increases and it will move faster.
- A force can change the direction of a moving body. For example in a cricket match, when a cricket ball is hit by a bat, then the direction of the cricket ball changes and it goes in another direction.
- A force can change the shape and size of a moving body. For example if we take a light spring and pull it at both the ends with our hands, then the shape and size of the spring changes.
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Gaurav Seth 6 years, 3 months ago
definition of chemical contamination is as follows:
Presence of unwanted substances that make air, water, soil, or food unfit for consumption or use.
Posted by Kunwar Veer Singh 6 years, 3 months ago
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Gaurav Seth 6 years, 3 months ago
No, diffused reflection is not the failure of laws of reflection
Diffused reflection is not due to the failure of the laws of reflection. It is caused by the irregularities in the reflecting surface.
Posted by Nikhil Gowda 6 years, 3 months ago
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Meghna Thapar 5 years, 10 months ago
- A medicine which stops the growth of, or kills the disease-causing microorganisms is called an antibiotic. The source of antibiotic medicines are microorganisms. These days a large number of antibiotics are produced from microorganisms such as fungi and bacteria. Some of the common antibiotics which are made from fungi and bacteria are Penicillin, Streptomycein, Erythromycein and Tetracycline. Antibiotics kill the disease-causing microorganisms but usually do not damage human body cells.
Antibiotics are used to treat many bacterial diseases in humans but are not effective against the diseases caused by viruses.
Posted by Nikhil Gowda 6 years, 3 months ago
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Gaurav Seth 6 years, 3 months ago
1.Milk is turned into curd by bacteria.
2. To make milk as curd , we need to add little pre -made curd into Luke warm milk.
3. Curd contains several micro organisms including Lactobacillus bacterium .
4. Lactobacilli bacteria promote the formation of curd from milk.
5.When little pre-made curd is added to warm milk, the Lactobacilli bacteria present in curd multiply and convert into curd.
6.Lacto bacillus bacteria convert the lactose sugar into lactic acid. This lactic acid converts milk into acid.
8.The optimum temperature for the Lacto Bacillus bacteria to convert milk into curd is 40⁰C.
9.If the milk is too hot bacteria can die and if it is too cold the bacteria cannot multiply.
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Meghna Thapar 5 years, 10 months ago
Measures which can be taken to conserve forests and wildlife are:
- The unauthorized cutting of forest trees for timber trade and fire-wood should be stopped immediately.
- In case of Government authorized felling of trees, for every acre of forest cut down, an equal area of land should be planted with saplings of trees to make up for the loss in long run.
- The natural habitats of wild animals should be preserved by establishing conservation areas such as Biosphere Reserves, Wildlife Sanctuaries and National Parks.
- A total ban should be imposed on the poaching or capturing of any wild animal or bird.
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Khilander Kumar 6 years, 2 months ago
2Thank You