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Ask QuestionPosted by Samriti Kv 5 years, 9 months ago
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Posted by Fadhim Njr2003 5 years, 9 months ago
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Vasunthra Pugalenthi 5 years, 9 months ago
Anamika Kumari 5 years, 9 months ago
Posted by Øjä$ Äñåñd 5 years, 9 months ago
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Veena Devaraj 5 years, 9 months ago
Posted by Priya Dua Rajvanshi 5 years, 9 months ago
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Veena Devaraj 5 years, 9 months ago
Posted by Milind Dongre 5 years, 9 months ago
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Gaurav Seth 5 years, 9 months ago
- Aerobic: A respiration process, which requires oxygen and releases lots of energy when the oxygen is used in body.
- Anaerobic:A respiration process which does not require oxygen.
Posted by Gurteg Singh 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
We all must have observed newly bought iron, a silver or copper article appears very shiny but with passage of time they get dull. This is due to the layer of metal oxide that develops on their surface. Rusting of iron, silver jewellery getting tarnished or copper articles getting covered by green layer. Metals react with atmospheric oxygen and produces metal oxides that are basic in nature because they react with water to form bases.
- In case of rusting of iron, the iron reacts with the oxygen present in air and moisture and develops rust (hydrated iron (III) oxide).
4Fe + 3O2 → 2Fe2O3.H2O
Posted by Bodasingi Sai Vaishnavi 5 years, 9 months ago
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Posted by Bodasingi Sai Vaishnavi 5 years, 9 months ago
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Posted by Priya Soni 5 years, 9 months ago
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Veena Devaraj 5 years, 9 months ago
Posted by Bodasingi Sai Vaishnavi 5 years, 9 months ago
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Posted by Aarohi Botre 5 years, 9 months ago
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Fadhim Njr2003 5 years, 9 months ago
Posted by Satyavani Chada 5 years, 9 months ago
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Posted by Bodasingi Sai Vaishnavi 5 years, 9 months ago
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Posted by Rashmi Kumari 5 years, 9 months ago
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Baljinder Kaur 5 years, 9 months ago
Fadhim Njr2003 5 years, 9 months ago
Divyansh Jain 5 years, 9 months ago
Yogita Ingle 5 years, 9 months ago
Image formed by a plane mirror has the following characteristics:
- Virtual and erect.
- Behind the mirror.
- Size of image is equal to size of object.
- Laterally inverted image (image of left side visible on right side).
- Distance of image behind the mirror is same as distance of object from mirror.
Posted by Rakesh Bhandari 5 years, 9 months ago
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Divyansh Jain 5 years, 9 months ago
Posted by Rudra Parihar 5 years, 9 months ago
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Posted by Hari Siddarth J.R 5 years, 9 months ago
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Meghna Thapar 5 years, 9 months ago
- Sanitation at Public Places: In our country a large number of fairs are organised periodically in which people participate. So, railway stations, bus depots, airports, hospitals are the busiest places where thousands of people visit daily. A large amount of waste is generated in such places which must be disposed of properly otherwise it will result into epidemics. The government has laid down certain standards of sanitation but, unfortunately, they are not strictly enforced. We should contribute in maintaining sanitation at public places.
There are some ways in which we can contribute in maintaining sanitation at public places like we should not scatter litter at public places.
We should play a keen role in keeping our environment clean and healthy. We must realise our responsibility in maintaining the water sources in a healthy state.
Posted by Satyavani Chada 5 years, 9 months ago
- 1 answers
Yogita Ingle 5 years, 9 months ago
- Large intestine is wider and shorter than small intestine which is about 1.5 metre length.
- Small intestine is the longest part of alimentary canal which is highly coiled and about 7.5 metres long.
Posted by Alisha Kumari 5 years, 9 months ago
- 1 answers
Yogita Ingle 5 years, 9 months ago
Grass eating animals like cows, buffaloes are called ruminants because they have a separate part of stomach called rumen .They quickly swallow the grass and is stored in rumen where it is partially digested forming cud.
Posted by Sanju Sing 5 years, 9 months ago
- 3 answers
V J 5 years, 9 months ago
Sanju Sing 5 years, 9 months ago
Posted by Mukyarla Mallesh 5 years, 9 months ago
- 2 answers
Yogita Ingle 5 years, 9 months ago
Waste water treatment includes physical, chemical as well as biological processes.
The steps involved in the treatment are as follows:
- Screening - Waste water is passed through bar screens. Large and easily visible objects such as sticks, cans, plastic packets and napkins are removed.
- Grit and sand removal - Water then enters a grit and sand removal tank. Water is passed slowly to allow sand, grit and pebbles to settle down.
- Water is allowed to settle in a large tank which slopes towards the middle. Solids (e.g. faeces) settle at the bottom and are removed with a scraper. This is sludge. A skimmer removes the floatable solids (e.g. oil and grease). Water so cleared is called clarified water.
- The sludge is then transferred to a separate tank where anaerobic bacteria decompose it. The biogas produced in the process can be used to produce electricity.
- Aeration: Anaerobic bacteria are allowed to grow by pumping in air into clarified water. Bacteria consume the unwanted matter still present in the clarified water.
- From the aeration tank, treated water is sent to another sedimentation tank, where, after several hours, the suspended microbes settle down as activated sludge and the water from the top is removed. As this activated sludge is about 97% water, sand drying beds or machines are used to remove water. The dried sludge is now used as manure, thereby returning the organic matter and nutrients to the soil.
- The treated water has a very low level of organic and suspended matter and is hence discharged into seas, rivers or into the ground.
- Sometimes, chemicals such as chlorine and ozone are used to disinfect water before releasing it into the distribution system.
Posted by Bodasingi Sai Vaishnavi 5 years, 9 months ago
- 2 answers
Satyavani Chada 5 years, 9 months ago
Posted by Kaushiki Kashyap 5 years, 9 months ago
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Nedhya Nair 5 years, 9 months ago
Posted by Dhruhi Shah 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
1. Filtration: The wastewater is passed through bar screen. Large objects; like rags, sticks, plastic bags, cans, etc. are removed in this process.
2. Grit and Sand Removal: The wastewater is slowly passed through the sedimentation tank. Grit, sand and pebbles settle down at the bottom.
3. Sedimentation: Water is then sent to the sedimentation tank. Solids; like faeces settle at the bottom. Floatable impurities; like oil and grease float on the surface. A scraper removes the faeces from the water. The impurity thus collected is called sludge; which is sent to the sludge tank. The sludge can be used to produce biogas or to produce manure. A skimmer removes the floatable impurities. Now, the water is called clarified water.
4. Aeration: Air is pumped into clarified water so that bacteria can proliferate. Bacteria consume the human waste. It leaves food waste, soap and other unwanted materials in the water. The microbes settle down at the bottom after several hours. Water is then removed from the top. This water is fit for irrigation and can be used for that purpose.
5. Chlorination: Water purified through aeration is not fit for human consumption. It needs to be treated with chlorine. For this, bleaching powder is added to the water. The chlorine kills whatever germs may be left in the water. After chlorination, the water is fit for drinking.
Posted by Rohan Upadyay 5 years, 9 months ago
- 1 answers
Posted by Riya Jain 5 years, 9 months ago
- 1 answers
Posted by Kshitija Padvi 5 years, 9 months ago
- 1 answers
Yogita Ingle 5 years, 9 months ago
Waste water treatment includes physical, chemical as well as biological processes.
The steps involved in the treatment are as follows:
- Screening - Waste water is passed through bar screens. Large and easily visible objects such as sticks, cans, plastic packets and napkins are removed.
- Grit and sand removal - Water then enters a grit and sand removal tank. Water is passed slowly to allow sand, grit and pebbles to settle down.
- Water is allowed to settle in a large tank which slopes towards the middle. Solids (e.g. faeces) settle at the bottom and are removed with a scraper. This is sludge. A skimmer removes the floatable solids (e.g. oil and grease). Water so cleared is called clarified water.
- The sludge is then transferred to a separate tank where anaerobic bacteria decompose it. The biogas produced in the process can be used to produce electricity.
- Aeration: Anaerobic bacteria are allowed to grow by pumping in air into clarified water. Bacteria consume the unwanted matter still present in the clarified water.
- From the aeration tank, treated water is sent to another sedimentation tank, where, after several hours, the suspended microbes settle down as activated sludge and the water from the top is removed. As this activated sludge is about 97% water, sand drying beds or machines are used to remove water. The dried sludge is now used as manure, thereby returning the organic matter and nutrients to the soil.
- The treated water has a very low level of organic and suspended matter and is hence discharged into seas, rivers or into the ground.
- Sometimes, chemicals such as chlorine and ozone are used to disinfect water before releasing it into the distribution system.
Posted by Amrit Editz 5 years, 9 months ago
- 1 answers
Yogita Ingle 5 years, 9 months ago
The speed at which the human heart beats is termed as the heart rate. To get an accurate reading, place your finger on an artery and count the pulses upto 60 seconds. Generally, a lower pulse or a heartbeat indicates that a person is physically fit and the heart muscles are in a good condition.
Posted by Tavleen Kaur 5 years, 9 months ago
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Posted by Satyavani Chada 5 years, 9 months ago
- 1 answers
Meghna Thapar 5 years, 9 months ago
Our atmosphere has 78% of nitrogen but this atmospheric nitrogen cannot be utilised directly by plants or animals. It has to be first converted into nitrogen compounds. This process of converting nitrogen gas of atmosphere into compounds of nitrogen is called nitrogen fixation. The nitrogen gas of atmosphere can be fixed by
- Certain nitrogen fixing bacteria present in the soil.
- By Rhizobium bacteria present in the root nodules of leguminous plants
- By blue-green algae
- By lightning
The nitrogen fixing Rhizobium bacteria live in the root nodules of leguminous plants like peas, beans, etc. and show symbiotic relationship.
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Swarnajit Dey 5 years, 9 months ago
1Thank You