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The perimeter of a rectangle is 230 cm.if the length of the rectangle is 70
answered Jul 17, 2017
Let $b$ be the breadth of the rectangle. Then 2*70 + 2*$b$ = 230 $b = \frac{230-140}{2} = 45 $cm...
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A and B skew symmetric.AB+ BA =? Which matrix...Ab-ba= which matrix?
answered Jul 17, 2017
$A' = -A$ and $B' = -B$ since A and B are skew symmetric. $AB + BA = -A'.-B' + -B'.-A'  = A'B'...
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What is Lorentz force? Write an expression for it.
answered Jul 17, 2017
The total force experienced by a changed particle moving in a region where both electric and magneti...
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X^3-5x^2-2x+24/x-4 kindly solve it
answered Jul 17, 2017
  ....................................
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An angle is 8 times its supplement. Determine its measure
answered Jul 17, 2017
Let angle be $\alpha$ Then, $\alpha = 8(180-\alpha) = 8*180 - 8*\alpha$ $\alpha = \frac{8*180}{9}...
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Apply Ampere's circuital law to find magnetic field inside and outside of a toroidal solenoid.  
answered Jul 14, 2017
A solenoid bent into the form of a closed ring is called a toroidal solenoid. Alternatively, it is a...
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answered Jul 14, 2017
A solenoid means an insulated copper wire wound closely in the form of a helix Calculation of m...
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answered Jul 14, 2017
Ampere's circuital law states that the line integral of the magnetic field $\overrightarrow{B}$ arou...
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Give the difference between Amylose and Amylopectin
answered Jul 14, 2017
Amylose :Water soluble component . It is long unbranched chain polymer.It contains 200-1000 $\a...
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What are the Difference between oils and fats
answered Jul 14, 2017
Oils are liquids  at ordinary temprature (below 20° and contain lower fatty acids or unsaturate
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What is the magnetic field on the axis of the circular loop
answered Jul 14, 2017
Consider a circular loop of wire of a radius $a$ and carrying current $I.$ Let the plane of the loop...
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What are Saponification Value
answered Jul 14, 2017
It is the number of milligrams of KOH  required to saponify 1g of oil or fat or the number of m...
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What are Proteins . Give the structures of Proteins.
answered Jul 14, 2017
Proteins They are linear polymers  of a-amino acids. Structure of Proteins  (a) Primary...
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What are Vitamins and give the classification of Vitamins
answered Jul 14, 2017
Vitamins are organic compounds required in the diet in small amounts to perform specific biolog...
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What are Denaturation of proteins
answered Jul 14, 2017
The loss of biological activity of proteins when a protein in its native form, is subjected to physi...
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What is Glycosidic linkage
answered Jul 14, 2017
The oxide linkage formed by the loss of a water molecule  when two monosaccharides are joined t...
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What is mutarotation
answered Jul 14, 2017
When either of the two forms of glucose is dissolved in water,  there is a spontaneous cha...
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List the Several materials obtained from cellulose.
answered Jul 14, 2017
1. Mercerised cotton : Cellulose treated with cone. sodium hydroxide  solution acquire silky lu...
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What is the magnetic field at the center of the circular current loop?
answered Jul 13, 2017
Consider a circular loop of wire of radius $r$ carrying current I. To calculate the magnetic field a...
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What is the magnetic field due to a long straight current carrying conductor? 
answered Jul 13, 2017
Consider a straight conductor $XY$ carrying current $I$. We wish to find its magnetic field at the p...
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What are Monosaccharides
answered Jul 13, 2017
These cannot be  hydrolysed to simpler molecules and further subdivided into tetroses, pentoses...
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Define Epimers ?
answered Jul 13, 2017
Such pairs of optical isomers which differ in configuration around any other C atom other than C1 at...
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Define Epimers ?
answered Jul 13, 2017
Such pairs of optical isomers which differ in configuration around any other C atom other than C1 at...
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Define Anomers?
answered Jul 13, 2017
Such pairs of optical isomers which differ in configuration only around C1 atom  are called ano...
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How to find the dimensions of a matrix as per the given entries?
answered Jul 13, 2017
Question incomplete. What are the entries ?
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The area of a square field is 1 1/2 hectares .Find the length of its diagon
answered Jul 13, 2017
Let $l$ be the length of the square. A hectare is $10000$ square meter. $ l^2 = 1.5 * 10000 \; m^2$...
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How has DDT caused decline in bird population?
answered Jul 12, 2017
High concentrations of DDT disturb calcium metabolism in birds which cause thinning of egg...
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What is the main idea behind “Joint Forest Management Concept” introduced by the Government of I
answered Jul 12, 2017
The main idea behind “Joint Forest Management Concept” is to work closely with the local commun
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How can slash and burn agriculture become environment friendly?
answered Jul 12, 2017
In Slash and burn agriculture or Jhum cultivation, trees are felled and forest is burnt followed by ...
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Why has National forest commission of India recommended a relatively larger forest cover for hills t
answered Jul 12, 2017
National Forest Commission of India has recommended a relatively larger forest cover for hills than ...
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What is hybrid vehicle technology? Explain its advantages with a suitable example.
answered Jul 12, 2017
It is a technology which uses a mixture of fuels like petrol, alcohol, CNG  or source of energy...
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What are the three major kinds of impurities in domestic waste water?
answered Jul 12, 2017
a) Gritb) Biodegradable organic matterc) Pathogenic contaminants 
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What do you understand by Snow-blindness?
answered Jul 12, 2017
Inflammation of cornea by UV-B rays is called snow blindness.  Snow blindness can result in the...
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It is a common practice to plant trees and shrubs near the boundary walls of the buildings. What pur
answered Jul 12, 2017
The plants growing near the boundary walls acts as barriers for sound pollution and act as dust catc...
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Name one green house gas and its possible source of production on a large scale. What are the harmfu
answered Jul 12, 2017
$CO_2$ and methane. $CO_2$ levels are increasing due to burning of fossil fuel leading to global war...
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Is it true that if the dissolved oxygen level drops to zero, the water will become septic. Give an e
answered Jul 12, 2017
Yes, the water becomes septic if the dissolved oxygen drops to zero. Organic pollution is an example...
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Is it true that carpets and curtain/drapes placed on the floor or wall surface can reduce the noise
answered Jul 12, 2017
Curtains and carpets/drapes are acoustic furnishings which absorb sound waves and therefore reduce t...
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What is cultural eutrophication?
answered Jul 12, 2017
Cultural or accelerated eutrophication is nutrient enrichment of the water body caused or aided by h...
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What is the best solution for the treatment of electronic wastes?
answered Jul 12, 2017
Burying in the landfills or incineration. 
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What is reforestation?
answered Jul 12, 2017
Reforestation refers to development of forests in denuded areas. 
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What do you understand by biomagnification?
answered Jul 12, 2017
Biomagnification is the increase in the concentration of a persistent pollutant, toxic chemical or h...
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What is an algal bloom?
answered Jul 12, 2017
Algal bloom refers to excessive growth of algae especially the blue green algae that colour the surf...
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Name an industry which can cause both air and thermal pollution and as well as eutrophication.
answered Jul 12, 2017
Fertilizer. 
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Mention any two examples of plants used as wind breakers in the agricultural fields.
answered Jul 12, 2017
Prosopis, Acacia and Nerium.
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Blends of polyblend and bitumen, when used, help to increase road life by a factor of three. What is
answered Jul 12, 2017
Mixture has enhanced binding capacity and has water repellent property. 
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What is the raw material for polyblend?
answered Jul 12, 2017
Waste plastic/polythene.
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It is a common practice to undertake desilting of the overhead water tanks. What is the possible sou
answered Jul 12, 2017
The source of slit is soil particles that come along with water from its source. 
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Name the city in our country where the entire public road transport runs on CNG.
answered Jul 12, 2017
New Delhi. 
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In which year was the Air (prevention and control of pollution) Act amended to include noise as air
answered Jul 12, 2017
1987
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What is organic farming? Discuss the benefits of organic farming as a viable practice in the context
answered Jul 12, 2017
Integrated organic farming refers to a “cyclical zero waste procedure, where waste products from one
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