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Ask QuestionPosted by Anshika Rana 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Pressure is defined as the thrust on unit area of a surface. Its SI unit is Pascal. Pressure = force/ area = F/A S.I unit is Nm-2 is also called 1Pascal (Pa). Pressure is scalar quantity.
Pressure is inversely proportional to the area. i.e. force acting on the small area exerts more pressure.
Pressure is directly proportional to the applied force. i.e. more pressure is exerted if the force is increased and vice-versa.
Posted by Saloni Gupta 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
- A force is any interaction that, when unopposed, will change the motion of an object.
- A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull.
- A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newton and represented by the symbol F.
- F = m a (Newton's second law)
- Force can be attractive or repulsive. In case of charges or magnetic poles, there will be repulsion if they are of like nature. On the other hand if nature is unlike, the force will be attractive.
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Yogita Ingle 7 years, 3 months ago
The process scattering seeds in the ground soil for growing the crop plants is called sowing.
Before sowing good quality seeds are selected.
Methods of sowing seeds :-
There are two methods of sowing the seeds in the soil are:-
1.Sowing by hand
2.Sowing with a seed drill.
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Yogita Ingle 7 years, 3 months ago
Fabric made from polyester does not get wrinkled easily. It remains crisp and is easy to wash. So it is quite suitable for making dress material. You must have seen people wearing nice polyester shirts and other dresses. Terylene is a type of popular polyester. It can be drawn into very fine fibres that can be woven like any other yarns.
Posted by Ashok Mishra 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Kerosene is a petroleum product which is used as fuel for stoves, lamps and jet aircrafts.
Posted by Chandan Kumar 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
The embryo which resemble a human being is known as foetus. It contains many cells.It is formed by repeated divisions of zygote. It takes 36-40 weeks or nine months for a human child to fully develop in the mother’s womb.
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Sonali Aggarwal 7 years, 3 months ago
When the amount of opposite electric chargeson the top and the bottom of a storm cloud becomes extremely large,then electric chargesstart flowing with high speed through the air between them.When the positive and negative charges of a cloud meet they produce and intense spark of electricity between the cloud and the sky.We see this electric spark as a flash of lightning in the sky.
Posted by Mikhil Js 7 years, 3 months ago
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Sonali Aggarwal 7 years, 3 months ago
Causes of earthquake:
*When the entangled rocks of the two crust plates break open suddenly with a big jolt,the earthquake occurs releasing a tremendous amount of energy.
*When the two plates of the earth's crust moving in the opposite directions colide with each other head on,then the ends of these crust plates buckle and fold forming a new mountains and causing earthquakes.
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Yogita Ingle 7 years, 3 months ago
An atom is defined as the basic unit of element which possesses the properties of the element. By basic, we mean that it is the building block of matter . It is the smallest particle of an element that can take part in a chemical reaction. Every atom consists of protons, neutrons and electrons. For example Carbon will consist of atoms which will show the properties of carbon only and not any other element
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Metals: Metals are lustrous, sonorous, ductile, and are good conductor of heat and electricity. Most of the metals are available as solid at room temperature; except mercury. Sodium and potassium are so soft that they can be cut with knife.
Posted by Ritesh Patel 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
Blood is normally slightly basic, alkaline, with a pH range of 7.35 to 7.45.
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Yogita Ingle 7 years, 3 months ago
Filtration: Filtration is a process by which insoluble solids can be removed from a liquid by using a filter paper. A filter paper is a special type of paper which has pores that are tiny enough to let only liquids pass through it. If you pass a solution through filter paper, any undissolved solid particles will get left behind on the paper whereas the liquid will filter through. The liquid that passes through is called the filtrate and the undissolved solid particles are called residue.
Example: A mixture of chalk powder and water can be separated by this method.
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