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Ask QuestionPosted by Aman Kumar 5 years, 11 months ago
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Posted by Monika Kumari 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Faraday’s first law of electromagnetic induction states that
whenever a conductor is placed in the varying magnetic field, electromagnetic fields are induced known as induced emf. If the conductor circuit is closed, a current is also induced which are called induced current.
Faraday’s Second Law
Faraday’s second law of electromagnetic induction states that
the induced emf in a coil is equal to the rate of change of flux linkage. Here the flux is nothing but the product of the number of turns in the coil and flux connected with the coil.
Posted by Monika Kumari 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Electric potential difference is known as voltage, which is equal to the work done per unit charge to move the charge between two points against static electric field.
Voltage = work done/ Charge
Gauri Semwal 5 years, 11 months ago
Posted by Ankit Kumar 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Double fertilization : It occurs when one male nucleus fertilizes (fuses) with egg cell to form zygote cell and other male nucleus fuses (fertilizes) with two polar nuclei to cause triple fusion. As these two types of fertilizations take place at the same time in the ovule of the plant, it is known as double fertilization.
After fertilization:
(i) Ovary develops into fruit.
(ii) Ovules develop into seeds.
Posted by Aman Munesh 5 years, 11 months ago
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Sudam Sethi 5 years, 11 months ago
Yogita Ingle 5 years, 11 months ago
Sodium metal is highly reactive. If it is kept open it can explosively react with oxygen, carbon dioxide and moisture present in the air. They catch fire and start burning.To prevent this explosive reaction and the After Effects sodium is kept immersed in kerosene oil.
Lithium, Sodium and potassium are also kept in kerosene oil they are also very reactive and catch fire easily.
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Posted by Aman Munesh 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Sodium metal is highly reactive. If it is kept open it can explosively react with oxygen, carbon dioxide and moisture present in the air. They catch fire and start burning.To prevent this explosive reaction and the After Effects sodium is kept immersed in kerosene oil.
Lithium, Sodium and potassium are also kept in kerosene oil they are also very reactive and catch fire easily.
Amit Yadav 5 years, 11 months ago
Posted by Afeefa Ara 5 years, 11 months ago
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Posted by Anshu Yadav 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
1. Uses of nonmetals in our daily life:
Oxygen which is 21% by volume helps in the respiration process. It is also used for manufacturing of steel and provides high temperature in metal fabrication process. Oxygen cylinders are used in hospital.
Chlorine is useful in removing stains and color patches as a bleaching agent. Various graded plastics and insecticides are made with chlorine. It helps in purification of water. How? Adding chlorine to drinking water kills the bacterias.
Helium is used as inert gas for scientific experiments. It is also used in weather balloons.
Iodine helps from throat infections and is used as antiseptic on wounds and cuts.
2. Nonmetals used in fertilizers:
Fertilizers contain nitrogen. It helps in plant growth. It enhances the rate of plant growth. Non Metal phosphorus is also used for better plant growth. These two nonmetals play a major role in plant growth.
3. Nonmetals used in crackers:
Sulfur and phosphorus are used in fireworks.
This was a brief on nonmetal uses . To know more about the uses of nonmetals download the BYJU’S – the learning app.
Adesh Sharma 5 years, 11 months ago
Posted by Shailesh Maurya 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
When the light rays passes through the atmosphere having layers of different densities and refractive indices, then atmospheric refractioon takes place. The actual sunrise takes place when the sun is above horizon. When the sun is just below the horizon, the light rays coming from it , on entring the Earth's atmosphere suffer atmospheric refraction from a rarer to denser medium . so, they bend towards the normal at each refraction. Due to continuous refraction of light rays at each layer, it follows a curved path and reaches the eye of the observer. As a result , we can see the sun 2 mins. before it rises above the horizon in the morning .
It is also due to refraction that we can still see the sun for abt 2 mins. even after the sun has set below the horizon.
As a result, the time from sunrise to sunset is increased by abt 4 mins
Posted by Shailesh Maurya 5 years, 11 months ago
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Sia ? 4 years, 6 months ago
A concave mirror can produce a magnified image of an object when it is placed :
- within its pole and its focus.
- in between its focus and its centre of curvature.
Difference between these two images :
- The image produced in first case will be virtual and erect.
- The image produced in the second case will be real and inverted.
Posted by Shailesh Maurya 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
The product obtained by complete combustion of ethanol is Carbon dioxide and water.
C2H5OH(l) + 3O2(g) ------> 2CO2 (g) + 3H2O(g) + heat energy.
Posted by Gagan Goyal 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Take a glass beaker fix two electrodes. The positive electrode acts as anode &negative electrode act as cathode. Fill 1/3 of beaker with water. Take two test tubes. Insert on electrodes. Observe the level of water in the test tubes. Connect the electrodes to a battery. Pass the electricity for a period of time. Later switch off the current and observe the level of water in test tubes. The level of water in the test tubes is decreased. The free space in the test tubes is filled with H2 & O2 gases. Oxygen gas is evolved at anode and hydrogen gas released at cathode.
Posted by Kartik Sharma 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Newlands’ law of octaves
- In 1866 an English scientist John Newlands arranged the elements in the order of
increasing atomic masses starting from the hydrogen having lowest atomic mass to the 56th element named thorium having the highest atomic mass among the elements discovered at that time. - It was found that every eighth element possessed properties similar to that of the first. Sodium is the eighth element after Lithium possessing properties similar to one another. Similarly, beryllium and magnesium resemble each other.
- This was comparable to octaves found in music and hence was called the ‘Law of Octaves’ or ‘Newlands’ Law of Octaves’.
- But the Law of Octaves was applicable only up to calcium, after which every eighth element did not resembled the first element.
⛩️Singh Emperor? (Believe In Study) 5 years, 11 months ago
Posted by Navya ?????❤ 5 years, 11 months ago
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⛩️Singh Emperor? (Believe In Study) 5 years, 11 months ago
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Posted by Night Walker 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
The two examples of different oxidations of ethanol are as follows:
(i) When Ethanol is burnt readily in air with blue flame.
The products obtained are carbon dioxide, water and release of heat and light.
The chemical reaction is as follows:
C2H5OH + 3O2 → 2CO2 + 3H2O + heat + light
(ii) When Ethanol is heated with alk. Potassium Permanganate solution KMnO4 or Potassium dichromate solution K2Cr2O7, the ethanol is oxidized to form the product as Ethanoic acid.
Posted by Night Walker 5 years, 11 months ago
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Posted by Night Walker 5 years, 11 months ago
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Posted by Night Walker 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Evolution : Evolution is the process of cumulative change in the heritable characteristics of a population.
Darwin's Theory :
All species of organisms arise and develop through natural selection of small, inherited variations that increase the individual's ability to complete, survive and reproduce.
Posted by Shraddha ☺️☺️ 5 years, 11 months ago
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Night Walker 5 years, 11 months ago
Posted by Kamal Khurmi 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Copper oxide is a weak base, and it easily reacts with HCl forming soluble copper(II) chloride and water.
CuO(s) + 2HCl(aq) → CuCl2(aq) + H2O(l)
Diksha? 5 years, 11 months ago
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Broken Heart ? #Girl 5 years, 11 months ago
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___ Alone _____ 5 years, 11 months ago
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Broken Heart ? #Girl 5 years, 11 months ago
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Vaishnavi Dhandale 5 years, 11 months ago
Posted by Sushila Maurya 5 years, 11 months ago
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Meghna Thapar 5 years, 10 months ago
- Writing Chemical Equations:
- In a chemical reaction, the reactants are written on the left hand side and the products on the right hand side of the equation.
- An arrow (→) pointing towards the products is inserted between the reactants and the products. It also represents the direction of the reaction.
- A single arrow (→) indicates the direction in which the reaction proceeds.
- A double arrow (⥮) indicates a reversible reaction, i.e. the products recombine to form the reactants.
- A plus sign (+) is inserted between two or more reactants or products formed.
- If reactions are carried out under specific conditions of temperature, pressure, catalyst etc., then these conditions are mentioned on the arrow.
The chemical equation can be made more informative by mentioning the physical states of the reactants and products.
- If gas is liberated as a product then it is represented by an arrow pointing upwards (↑).
- If the product formed is in the form of a precipitate, it is represented by an arrow pointing downwards (↓).
Posted by Gayathri Devi 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
The impression of an object seen by the eye persists on the retina for 1 /16 th of a second, even after the object is removed. If another object is seen before this time, the impressions of the two merge to give us the sensation of continuity. This property of eye is called persistence of vision.
Posted by Yash Preet 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
A vascular bundle is a part of the transport system in vascular plants. Vascular bundle is a unit strand of the vascular system in stems and leaves of higher plants, consisting essentially of xylem and phloem. Usually vascular bundle has phloem on the outside and xylem on the inside.
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Posted by ꧁༒Ķïłłěŕ_Ṩนℑåł༒꧂, Sharma 5 years, 11 months ago
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Posted by Rachnanitin Sachdeva 5 years, 11 months ago
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Meghna Thapar 5 years, 10 months ago
- Some terms related to spherical mirrors:
- The centre of curvature (C) of a spherical mirror is the centre of the hollow sphere of glass, of which the spherical mirror is a part.
- The radius of curvature (R) of a spherical mirror is the radius of the hollow sphere of glass, of which the spherical mirror is a part.
- The pole (P) of a spherical mirror is the centre of the mirror.
- The principal axis of a spherical mirror is a straight line passing through the centre of curvature C and pole P of the spherical mirror.
- The principal focus (F) of a concave mirror is a point on the principal axis at which the rays of light incident on the mirror, in a direction parallel to the principal axis, actually meet after reflection from the mirror.
- The principal focus (F) of a convex mirror is a point on the principal axis from which the rays of light incident on the mirror, in a direction parallel to the principal axis, appear to diverge after reflection from the mirror.
- The focal length (f) of a mirror is the distance between its pole (P) and principal focus (F).
For spherical mirrors of small aperture, R = 2f.
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Yogita Ingle 5 years, 11 months ago
Monohybrid cross is a cross between parents differing in only one trait or in which only one trait is being considered.
Dihybrid cross is a cross between parents in which two pairs of contrasting characters are studied simultaneously for the inheritance pattern.
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