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Posted by Mayank Singh 6 years, 5 months ago
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Gaurav Seth 6 years, 5 months ago
Herbarium is an album containing the live samples of different varieties of seeds, cereals and pulses.
You need to make a herbarium using different types of leaves of the cereals, seeds and pulses.
Sowing time:
Cereals: July to October
Pulses: May to August
Oil seeds: March
Harvesting:
Cereals: November
Pulses: October to December
Oil seeds: June
Posted by Zuber Khan 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
In physics, buoyancy or upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus the pressure at the bottom of a column of fluid is greater than at the top of the column.
Posted by Nitish Kumar 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
Here are several application of sublimation :
1.Dry ice sublimes while keeping its area cold. No water is produced to wet things.
2.Naphthalene, mothballs, sublime into the air, not getting the area wet, while keeping moths away.
3.Iodine can be displaced in a compound and collected on the bottom of a watch glass with ice on top, in deposition, opposite of sublimation.
This also occurs as frost is formed on a window from humid air as the dew point falls below freezing.
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Hariom Dalal 6 years, 5 months ago
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Sia ? 6 years, 5 months ago
A chemical formula is the representation of elements present in a compound with the help of symbols and also the number of atoms of each element with those numbers only. for eg: A molecule of water (compound) contains 2 atoms of hydrogen and one atom of oxygen hence its chemical formula is H2O
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The assumptions of kinetic theory of gases are:-
- A gas consists of a very large number of molecules which should be elastic spheres and identical for a given gas.
- The molecules of a gas are in a state of continuous rapid and random motion.
- The size of gas molecules is very small as compared to the distance between them.
- The molecules do not exert any force of attraction or repulsion on each other.
- The collisions of molecules with one another and with walls of the vessel are perfectly elastic.
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Yogita Ingle 6 years, 5 months ago
Ultrasounds are high frequency waves, which can travel in defined paths even in the presence of many obstacles
Medical applications
- Ultrasonic waves are used to capture the images of the heart and its features and problems associated with the heart, if any (for treatment purpose). This is called echocardiography.
- Ultrasound scans/Ultrasonography are very commonly used to get images of internal body organs such as liver, kidney, uterus. It helps the doctor to diagnose and treat problems in the body of the patient. In this method, ultrasound waves are made to travel through the body to the organ under consideration. They get reflected and these are converted to electrical signals which can be monitored on a screen.
- Ultrasonography is used to observe the growth of the fetus inside the uterus. It can also used to monitor the abnormalities.
- It is used to break kidney stones into fine grains which later get flushed out through urine.
Industrial Applications
- Ultrasound is used to clean machine parts located in places which are not easily accesible - electronic components, internal parts, spiral parts etc. The objects are placed in a cleaning solution and waves are passed through it. Because of the high frequency of the waves, the dust particles just fall out.
- It is used to detect defects, flaws, cracks in machine parts, bridges, building etc. Ultrasound waves are passed at one end and monitored using detectors. If there are laws or cracks, then the ultrasound waves are reflected back indicating the presence of a defect.
Posted by Isha Gupta 6 years, 5 months ago
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Yogita Ingle 6 years, 5 months ago
- Law of conservation of linear momentum is a extremely important consequence of Newton's third law of motion in combination with the second law of motion. According to law of conservation of momentum
- When two or more bodies acts upon each other their total momentum remains constant provided no external forces are acting
- So, Momentum is never created or destroyed.
- When this law is applied for a collision between two bodies, the total momentum of the colliding bodies before collision is equal to the total momentum after collision.
- We can apply this law for a collision between two vehicles. This law is applicable for all types of collisions.
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45516111? 46 6 years, 5 months ago
Yogita Ingle 6 years, 5 months ago
If the medium has a lower concentration of water than the cell, meaning that it is a very concentrated solution, the cell will lose water by osmosis. Such a solution is known as a hypertonic solution. Again, water crosses the cell membrane in both directions, but this time more water leaves the cell than enters it. Therefore the cell will shrink.
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Yogita Ingle 6 years, 5 months ago
Boiling is a bulk phenomenon. Particles of the bulk of the liquid gain enough energy to change to vapour state. The entire bulk of liquid and all the molecules including the interior and the surface gain energy to change to vapour state. The heat energy is supplied from the bottom of the liquid. Therefore the heat energy goes to the entire bulk of liquid and starts boiling. Whereas evaporation is a surface phenomenon. Only the particles on the surface gain enough energy to get converted into vapour state. A small fraction of particles at the surface gain energy and break away from the force of attraction of the other particles and changes to vapour state.
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(a)273K (b)freezing/solidification (c)latent heat of energy (d)Fusion (e)latent heat of fusion
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Lysosomes are membrane bound vesicles act as waste disposal system of the cell. Lysosymes have digestive enzymes which help in digesting foreign material as well as worn-out cell organelles. The enzymes breakdown the organic substances. Lysosymes are called the suicide bags of the cell as they help in the digestion of damaged, worn out parts of its own cell.
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Hariom Dalal 6 years, 5 months ago
1Thank You