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S Balamani Kanta Reddy 8A 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
The process of deriving large crystals of pure substances from their solutions is known as crystallisation. It is a physical change. Crystals of salt are obtained by the evaporation of sea water.
Similarly crystals of copper sulphate can be obtained by adding copper sulphate powder to the boiling solution of water and dilute sulphuric acid. This mixture when filtered and allowed to cool produces crystals of copper sulphate.
Posted by Sohini Naskar 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
An electromagnetic field is referred as a physical field of objects that are electrically charged. It is one among the four fundamental forces of nature, other includes strong interaction, weak interaction, and gravitation.
The electromagnetic field affects the change in the behaviour of charged objects surrounding a particular place. It extends indefinitely throughout space and known as electromagnetic interactions.
Tejasvi . 5 years, 2 months ago
Posted by Lipsa Muduli 5 years, 2 months ago
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Navpreet Kaur 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
The process of deriving large crystals of pure substances from their solutions is known as crystallisation. It is a physical change. Crystals of salt are obtained by the evaporation of sea water.
Posted by Tejesh Banit 5 years, 2 months ago
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Tejasvi . 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
- Photosynthesis is the making of food by plants. The essential ingredients in making this food are sunlight, the chlorophyll that is present in green plants, water and carbon dioxide in the air.
- Photosynthesis is necessary not just for plants to make food for themselves, but for animals, including us eventually.
Posted by Tejasvi . 5 years, 2 months ago
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Tejesh Banit 5 years, 2 months ago
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A distance-time graph shows how far an object has travelled in a given time. It is a simple line graph that denotes distance versus time findings on the graph.
- Distance is plotted on the Y-axis.
- Time is plotted on the X-axis.
Posted by Tejasvi . 5 years, 2 months ago
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Posted by Tejasvi . 5 years, 2 months ago
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Anushka Kapoor 5 years, 2 months ago
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The reaction between an acid and a base to give a salt and water is known as a neutralisation reaction. Acids and bases react with each other to nullify the effect of each other. Let us consider a simple reaction. Take a sample of NaOH which is a base and add drops of dilute HCl.
The reaction will be as follows:
NaOH (aq) + HCl(aq) → NaCl(aq) + H2O(l)
Therefore while suffering from acidity it is prescribed to take antacid which are bitter in taste i.e. they are base. And on entering the body the base neutralise the excess acid released into the stomach and convert it into salt and water.
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Posted by Tejasvi . 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Concave lens:
1) It has both surfaces curving inwards.
2) It is thicker at edges and thinner at middle.
3) It diverges the light coming towards it.
4) Its focal length is negative.
5) It always produces a virtual image.
Convex lens:
1) It has both surfaces curving outwards.
2) It is thicker at middle and thinner at the edges.
3) It converges the light coming towards it.
4) Its focal length is positive.
5) It always produces a real image and forms a virtual image only when the object is between the focus and optical centre.
Posted by Tejasvi . 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
| 1 | Meaning and Other Names |
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| 2 | Structure |
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| 3 | Position of the Focus |
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Posted by Tejasvi . 5 years, 2 months ago
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Tejasvi . 5 years, 2 months ago
Meghna Thapar 5 years, 2 months ago
Sorter's Disease is another name for Anthrax. It is caused by the bacteria Bacillus anthracis. Historically, anthrax was called wool sorter's disease because individuals who sorted wool of infected animals contracted the disease.
Symptoms of Anthrax (Woolsorters' Disease, Ragpickers' Disease)
- Cutaneous anthrax: Painless papule, blister, or ulcer after contact with infected material. ...
- Inhalation anthrax: Fever, cough, and shortness of breath – similar to an atypical pneumonia.
- Gastrointestinal anthrax: Nausea and vomiting, diarrhoea.
Posted by Palak J 5 years, 2 months ago
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Tejasvi . 5 years, 2 months ago
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Aryan Raj 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Loamy soil is a mixture of sand, clay silt and humus So, should not make pots and idols of got and toys.
Clay soil retains moisture and becomes very sticky when wet. Dry clayey soil is hard so the pots and toys will not break. Hence clayey soil is used to make pots and toys
Posted by Shivam Dhiman 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
Crystallization is a technique used for the purification of substances. A separation technique to separate solids from a solution.
- Purification of seawater
- Separation of alum crystals from impure samples
- In the pharmaceutical industry, crystallization is used as a separation and purification process for the synthesis and isolation of co-crystals, pure active pharmaceutical ingredients (API), controlled release pulmonary drug delivery, and separation of chiral isomers.
Yogita Ingle 5 years, 2 months ago
The process of deriving large crystals of pure substances from their solutions is known as crystallisation. It is a physical change. Crystals of salt are obtained by the evaporation of sea water.
Posted by Dhruvraj Chudasama 5 years, 2 months ago
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Posted by Sabu Kuriakose 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
the importance of ISI mark in electrical appliances are:-1)it make us know about the requirements of how much electricity an indian should need.
2)it is tested by the bureau of indian standards
Posted by Jainu Treesa Joseph 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
Calculation of Velocity using distance-time graph:
To calculate the velocity, let take two points A and B on the slope OB.
Draw one line parallel to y-axis and another parallel to x-axis from B.
<hr />Again draw a line parallel to y-axis and another parallel to x-axis from point A.
Let, line parallel to x-axis from point B cut at a point, S2 at y-axis.
Line parallel to x-axis from point A cut at point, S1 at y-axis.
Let, line parallel to y-axis from point B cut at t2 at x-axis.
Line parallel to y-axis from point A cut at t1 at x-axis.
Now, BC= Distance = S2 – S1 and AC = time = t2 – t1
<hr />We know that slope of the graph is given by the ratio of change in y-axis and change in X-axis.
Or, Slope = (text{Change in y-axis})/(text{Change in x-axis})`
Thus, slope, AB=BCACAB=BCAC
Or, v=s2−s1t2−t1v=s2-s1t2-t1
Where, vv= velocity, (s2−s1)(s2-s1) = interval of distance and (t2−t1)(t2-t1) = time interval
Thus, velocity=DistanceTimevelocity=DistanceTime
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