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Meghna Thapar 5 years, 7 months ago
Audible sounds are sounds of frequency which are audible to human ear. However, on the other hand, inaudible sounds are those sounds who have frequency not audible for human ear. The frequency of audible sounds is usually 20-20,000 hertz, while that of inaudible is above 20kHz(kiloHertz). The human ear can easily detect frequencies between 20 Hz and 20 KHz. Hence sound waves with frequency ranging from 20 Hz to 20 KHz is known are audible sound. The human ear is sensitive to every minute pressure difference in the air if they are in the audible frequency range.
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Vaishnavi. M Vaishnavi. M 7 years, 4 months ago
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Meghna Thapar 5 years, 7 months ago
Flora refers to the plant life found in a particular region. It is the naturally occurring or the indigenous native plant life. The term fauna represents all the animal species found in a particular region at a particular time. These are the naturally occurring animal species of the particular area. Flora is a group of indigenous plants in an ecosystem of a geographical region. Fauna is a group of indigenous animals of any geographical region. So, the term flora and fauna was coined by biologists to refer to a collection of plant and animal specifies in a given geographic location.
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Yogita Ingle 7 years, 4 months ago
Fast moving air towards a centre; usually with heavy rain; is known as cyclone. Wind direction, wind speed, humidity and temperature together create cyclone.
When water vapour in the clouds cools down it releases heat. This heat warms the air around the clouds. The warm air rises up and creates a low pressure zone. This low pressure zone is quickly filled in by cooler air from the surrounding. This creates a system in which the centre is having very low pressure and is surrounded by wind moving around it. The wind from the surroundings moves in a circular fashion towards the centre and gives rise to cyclone.
The centre of the cyclone is called ‘eye’. A cyclone may be 10 to 15 km high. It is a rotating mass of air. The diameter of eye may be vary from 10 to 30 km. Eye of a cyclone is a calm area, but around the eye air may move with high speed such as 150 to 250 km/h.
Posted by Manjot Singh 7 years, 4 months ago
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Meghna Thapar 5 years, 7 months ago
Paperboard, which is used to make products such as cereal and cracker boxes, can be made from recycled paper. Cardboard can be manufactured from 100 percent recycled paper as well. Recycling paper is a great change as it decreases the cutting of trees thus the less trees cut the more oxygen produced . It will also increase aforestation . There are three categories of paper that can be used as feedstocks for making recycled paper: mill broke, pre-consumer waste, and post-consumer waste.
Posted by Khushpreet Kaur 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
Vaccines contain dead or weakened microbes of a particular disease. When a vaccine is introduced into a healthy body, the body fights and kills them by producing suitable antibodies. These antibodies remain in the body and protect it when the microbe enters the body again.
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Meghna Thapar 5 years, 7 months ago
Uses of metals:
- Gold, Platinum and silver are used as jewelleries and ornaments.
- Iron and steel are used for construction purpose.
- Aluminium, steel are used as utensils.
- Mercury is used in thermometer and helps to check the temperature.
- Aluminium are used as insulation wires.
Uses of non-metals:
Shiny metals such as copper, silver, and gold are often used for decorative arts, jewelry, and coins. Strong metals such as iron and metal alloys such as stainless steel are used to build structures, ships, and vehicles including cars, trains, and trucks. Some metals have specific qualities that dictate their use.
Posted by Krish Shah 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
Fuel Efficiency: The amount of energy produced in the form of heat as result of combustion of complete combustion of 1Kg of fuel is known as calorific value of fuel expressed in unit called kilojoule per Kg (kJ/Kg).
Calorific value of cow dung: 6000-8000
Calorific value of wood :17000-22000
Posted by Abhas Shukla 7 years, 4 months ago
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Yogita Ingle 7 years, 4 months ago
Rolling friction is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. Sliding friction is the force resisting the motion when a body slides on a surface. The force of friction depends on the area of contact between the two surfaces. As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction.
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Meghna Thapar 5 years, 7 months ago
The main function of the cover slip is to keep solid specimens pressed flat, and liquid samples shaped into a flat layer of even thickness. The cover slip can be glued to the slide so as to seal off the specimen, retarding dehydration and oxidation of the specimen. This smaller sheet of glass, called a cover slip or cover glass, is usually between 18 and 25 mm on a side. The cover glass serves two purposes: (1) it protects the microscope's objective lens from contacting the specimen, and (2) it creates an even thickness (in wet mounts) for viewing.
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