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a man wants to donate rectangular plot of land for a school in his village. when he was asked to give the dimension of the plot, he told that if its length is decreased by 50m and breadth is increased by 50m then its area will remain same but if its length is decreased by 10m and breadth is decreased by 20m, then its area will decrease by 5300m^2. using matrices, find the dimension of the plot. also give reason why he wants to donate the plot for a school.


Posted by Tahmid Hossain (May 26, 2017 6:26 p.m.) (Question ID: 5505)

Is there any unique company following all the principles of Henry fayol?? As I have to make project on principles of management..

Posted by Richa Aggarwal (May 25, 2017 8:47 p.m.) (Question ID: 5490)

Describe the contrast that aness jung bring out between saheb and the son of priest?

Posted by Nitin Arora (May 25, 2017 2:29 p.m.) (Question ID: 5486)

  • Answers:
  • Ans. The narrator remembers a story of a boy from Udipi. He was the son of a priest. He would pray for a pair of shoes to the goddess. Young boys like the son of the priest now wear shoes. But rag pickers of her neighbourhood like Saheb remain shoeless. The contrast is obvi­ous. It shows two different pictures of the same society.

    Answered by Naveen Sharma (May 25, 2017 3:30 p.m.)
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A 0.004 M solution of sodium sulphate is isotonic with 0.01M solution of glucose at same temperature. Calculate the degree of dissociation of sodium sulphate 

Posted by Meenakashi Chawla (May 25, 2017 11:13 a.m.) (Question ID: 5481)

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  • Ans.
    Answered by Payal Singh (May 25, 2017 4:32 p.m.)
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What is gestation?

Posted by SJ Jinsey (May 24, 2017 12:23 p.m.) (Question ID: 5461)

  • Answers:
  • Gestation is the process of development of fetus, beginning with fertilization and ending at birth. The duration of gestation period varies between species.

    Answered by Payal Singh (May 24, 2017 12:38 p.m.)
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Why nitrogen is filled in  the  cyllinders of scuba divers if it blocks our capillaries.

Posted by Deepanshu Banga (May 23, 2017 12:18 p.m.) (Question ID: 5444)

I need Note's of Political science 

Posted by ChandrPal Singh Adbala (May 22, 2017 7:26 p.m.) (Question ID: 5433)

Explain the reason of depresion in frezing point

Posted by Pawan Kabdal (May 22, 2017 4:55 p.m.) (Question ID: 5431)

  • Answers:
  • Freezing point depression is the phenomena that describes why adding a solute to a solvent results in the lowering of the freezing point of the solvent. When a substance starts to freeze, the molecules slow down due to the decreases in temperature, and the intermolecular forces start to take over. The molecules will then arrange themselves in a pattern, and thus turn into a solid. For example, as water is cooled to the freezing point, its molecules become slower and hydrogen bonds begin to "stick" more, eventually creating a solid. If salt is added to the water, the Na+ and Cl- ions attract to the water molecules and interfere with the formation of the large network solid known as ice. In order to achieve a solid, the solution must be cooled to an even lower temperature.

    The freezing point depression can also be explained in terms of vapor pressure. Adding solute to a solvent will essentially dilute the solvent molecules, and according to Raoult's law, this leads to a decrease in vapor pressure. Considering the fact that the vapor pressure of the solid and liquid forms must be the same at freezing point, because otherwise the system would not be at equilibrium, the lowering of the vapor pressure leads to the lowering of the temperature at which the vapor pressures of the liquid and frozen forms of the solution will be equal.


     The freezing point depression can be calculated by the formula:

    {tex}\Delta T_f=i\times K_ f\times molality{/tex}

    In this equation,

    {tex}\Delta T_f{/tex} is the freezing point depression,

    Kf is the freezing point depression constant,  and i is the van 't Hoff factor.

    The freezing point depression constant changes depending on the solvent, and the van 't Hoff factor accounts for the number of particles that a dissolving solute creates in solution.


    Answered by Payal Singh (May 23, 2017 11:07 a.m.)
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What message dos the writer want to convey to the readers through the last lesson

Posted by Nitin Arora (May 21, 2017 1:35 p.m.) (Question ID: 5406)

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  • Ans. Alphonse Daudet has a definite message to convey to his readers. Through M. Hamel he wants to express pride in one's language. Greatness of French language is high­lighted. The lesson arouses patriotic feelings. It makes the readers aware that they must keep their language and culture alive at all costs

    Answered by Naveen Sharma (May 22, 2017 1:51 p.m.)
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Name the dielectric  whose molecules have zero and non zero dipole moment.

Posted by Shubhanshu Shubh (May 20, 2017 4:24 p.m.) (Question ID: 5396)

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  • (i) The dielectric having non- zero dipole moment is water.

    (ii) The dipole having zero dipole moment is diamond (or silicon).

    Answered by Payal Singh (May 20, 2017 4:35 p.m.)
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Please confirm books for English elective for class 12 

Posted by amarjiet Luthrra (May 20, 2017 11:19 a.m.) (Question ID: 5390)

Two charges of 2microC but opposite in sign are placed 1pcm apart.Calculate the electric field at a point distance 10cm from the midpoint on the axial line of dipole.

Posted by Vishnumaya Menon (May 20, 2017 9:56 a.m.) (Question ID: 5388)

  • Answers:
  • Ans. Given : 

    Charge q = 2 mC = {tex}2 \times 10 ^{-6} C{/tex} 

    Distance b/w them (2a) = 10 cm = 10-1 m

    Distance from mid-point on axial line r = 10 cm = 10-1  m

    We Know 

    p = {tex}q \times 2a{/tex} = {tex}2 \times 10 ^{-6} \times 10^{-1} = 2 \times 10 ^{-7} {/tex}

    Electric field due tp dipole on Axial line E  = {tex}{1\over 4\pi \in } \times {2p\over r^2}{/tex}

    {tex}9\times 10 ^ 9 \times 2 \times 2 \times 10^{-7}\over 10^{-2} {/tex} = {tex}36 \times 10 ^ 7 \ N/C{/tex}

    Answered by Naveen Sharma (May 20, 2017 10:16 a.m.)
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What is the theme of the invisible man??

Posted by TEJASV Jain (May 19, 2017 10:12 p.m.) (Question ID: 5385)

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  • Ans. The Invisible man presented by H.G Wells is a science fiction, carries the illusion of scientific revolution. where, we see " How a man with persistent efforts is able to bring our the desirable results but the same could be a disaster as well, if taken in use for the humanity.

    Griffin as an eccentric scientist is the one who, with his keen interest in the subject makes it possible to bring the human body invisible which he later applied on himself in the desire of power. his lust for his dream, made him pursue what he did not even think of doing in his entire life. when things went our of his hand. he took an evil path to fulfil what he desires. he became a threat for the society. Because of the criticism received by others on his extra ordinary efforts. He was so much raged that he decided to take t he revenge from all those who were a part of it.

    But still we should not forget that nothing is much powerful than the wish of almighty. he desired for the terror among the other for him but he met a fatal end. the curtain of his life fell. An extra ordinary genius died because of his greed of coming in power and becoming a terror

    Answered by Naveen Sharma (May 20, 2017 9:07 a.m.)
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what is the best topic and easy to do that for project

Posted by anurag pandey (May 17, 2017 4:44 p.m.) (Question ID: 5348)

what is consumer income?

Posted by Sandeep Sam (May 17, 2017 10:34 a.m.) (Question ID: 5346)

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  • Ans. Consumer income is the money that a consumer earns from either work or investment, such as dividends distributed by companies to its shareholders and the gain realised on the sale of an asset, such as a house. When you combine these income sources, it's often referred to as aggregate income.

    Answered by Naveen Sharma (May 17, 2017 2:08 p.m.)
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Coordination is implicit and inherent in all organization. Explain

Posted by sandli pawar (May 17, 2017 9:18 a.m.) (Question ID: 5345)

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  • Ans. Co-ordination is the unification, integration, synchronisation of the efforts of group members so as to provide unity of action in the pursuit of common goals. It is a hidden force which binds all the other functions of management.

    Management seeks to achieve co-ordination through its basic functions of planning, organising, staffing, directing and controlling. That is why, co-ordination is not a separate function of management because achieving of harmony between individuals efforts towards achievement of group goals is a key to success of management.

    Co-ordination is the essence of management and is implicit and inherent in all functions of management.

    Answered by Naveen Sharma (May 17, 2017 9:35 a.m.)
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What is the balance diet?

Posted by sanjay kumar (May 17, 2017 8:54 a.m.) (Question ID: 5343)

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  • A diet that contains sufficient amount of proteins, fats, carbohydrates, minerals, salts, vitamins and water is called balanced diet. A balanced diet is that which contains the proper amount of each nutrient required by our body.

    Answered by Rupender singh (May 17, 2017 9:25 a.m.)
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  1. Why goodwill already appeared in the bòoks is debited to old partners capital account ?
Posted by vinita sadhwani (May 15, 2017 3:47 p.m.) (Question ID: 5317)

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  • Goodwill is debited so as to write off the goodwill. As it shouldn't have to be shown in the current year balance sheet. For the same, goodwill should be distributed among the partner.

    Answered by Richa Aggarwal (May 23, 2017 5:40 p.m.)
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Why sexual reproduction is considered as unfavourable mode of reproduction


Posted by Jaiprakash Lackrany (May 12, 2017 4:12 p.m.) (Question ID: 5257)

i want solution of exercise in this 12 biotech book .


Posted by Keshav ATRI (May 12, 2017 2:56 p.m.) (Question ID: 5254)

An other name of heterogamete as homogamete is isogametes

Posted by Anamika pal (May 12, 2017 11:44 a.m.) (Question ID: 5251)

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  • Another name of homogamete is isogamous


    Answered by Jaiprakash Lackrany (May 12, 2017 4:14 p.m.)
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  • An other name of heterogametes is anisogametes

    Answered by Payal Singh (May 12, 2017 12:01 p.m.)
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What happens in oestrous cycle

Posted by Anamika pal (May 12, 2017 11:42 a.m.) (Question ID: 5250)

  • Answers:
  • Ans. Oestrous is the main reproductive cycle of other species females of non-primate vertebrates, for example rats, mice, horses, pig have this form of reproductive cycle.

    Estrous Cycle Stages:  
    proestrus - estrus - metestrus - diestrus

    • Proestrus:The first stage in the estrous cycle immediately before estrus characterized by development of both the endometrium and ovarian follicles.
    • Estrus: The second stage in the estrous cycle immediately before metestrus characterized by a receptivity to a male and to mating, often referred to as "heat" or "in heat". Pheromones may also be secreted only at this stage of her cycle.
    • Metestrus The third stage in the estrous cycle immediately before diestrus characterized by sexual inactivity and the formation of the corpus luteum.
    • Diestrus The last stage in the estrous cycle immediately before the next cycle proestrus characterized by a functional corpus luteum and an increase in the blood concentration of progesterone.
    Answered by Naveen Sharma (May 12, 2017 12:11 p.m.)
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What are pseudopodiospores

Posted by Anamika pal (May 12, 2017 11:41 a.m.) (Question ID: 5249)

  • Answers:
  • Pseudopodiospores are spores produced by the amoeba under favorable condition to carry out asexual reproduction means producing new amoeba from each pseudopodiospore.

    Answered by Payal Singh (May 12, 2017 12:02 p.m.)
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Which type of reproduction take place in onion



Posted by Anamika pal (May 12, 2017 11:39 a.m.) (Question ID: 5248)

  • Answers:
  • Ans. Onions reproduce either with seeds or by bulbils (little bulbs) that form from lateral buds.

    Answered by Naveen Sharma (May 12, 2017 12:06 p.m.)
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Ishan wants to donate a rectangular plot of land for a school in his village. When he was asked to give dimensions of the plot ,he told that if its lenght is decreased by 50m and breadth increased by 50m,then area will remain same but if length is decreased by 10m and breadth decreased by 20m then area will decreased by 5300 metre square. using Matrix method, find dimensions of the plot

Posted by Prashant Jha (May 11, 2017 9:51 p.m.) (Question ID: 5245)

  • Thanks naveen sharma


    Posted by Prashant Jha (May 12, 2017 10:53 a.m.)
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  • Answers:
  • Ans. Let the length of Plot = x m

    Breadth of plot = y m

    Area of Plot = xy

    According to First condition, 

    (x-50) (y+50) = xy 

    => xy + 50x -50y - 2500 = xy 

    => 50x - 50y = 2500

    => x- y = 50 ........ (1)

    According to 2nd condition, 

    (x-10) (y-20) = xy - 5300

    => xy - 20x - 10y + 200 = xy -  5300

    => -20x - 10y = -5500

    => 20x + 10y = 5500

    => 2x + y = 550 ........(2) 

    We can represent these two equation using Matrix 

    A = {tex}\begin{bmatrix} 1 & -1 \\ 2& 1 \end{bmatrix}{/tex},  |A| = 1+2 = 3

    X = {tex}\begin{bmatrix} x \\ y \end{bmatrix}{/tex}

    B = {tex}\begin{bmatrix} 50 \\ 550 \end{bmatrix}{/tex}

    Such that AX = B

    X = A-1B
    A-1 {tex}Adjoint \space of \space A\over Determinant \space of \space A {/tex}

    => X= {tex}{1\over 3} \begin{bmatrix} 1 & 1 \\ -2& 1 \end{bmatrix}\begin{bmatrix} 50 \\ 550 \end{bmatrix}{/tex}

    => X = {tex}{1\over 3}\begin{bmatrix} 600 \\ 450 \end{bmatrix}{/tex}

    =>X =  {tex}\begin{bmatrix} 200 \\ 150 \end{bmatrix}{/tex}

    x = 200

    y = 150 

    So Length of Plot = 200 m

    Breadth of Plot = 150 m

    Answered by Naveen Sharma (May 12, 2017 9:36 a.m.)
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how did the peddler get material for making rattrap ?


Posted by Shelly Gupta (May 09, 2017 6:44 p.m.) (Question ID: 5176)

  • Answers:
  • Ans. The Peddler went around selling small rattraps. They were made of iron wires. He got the material by begging in the stores or at the big farms.

    Answered by Naveen Sharma (May 10, 2017 10:12 a.m.)
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Using Gauss Law, show that electric field inside a conductor is zero.

Posted by Yogendra Singh (May 09, 2017 4:48 p.m.) (Question ID: 5172)

The number of tetrahedral voids present on each body diagonal in ccp unit cell is 


Posted by Muskan Asthana (May 09, 2017 12:04 p.m.) (Question ID: 5169)

  • Answers:
  • 2 tetrahedral voids on each body diagonal in ccp unit

    Total 8 tetrahedral voids in 1 ccp unit

    Answered by Aashka Shah (May 09, 2017 2:17 p.m.)
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CsBr crytal has bcc structure,

It has an edge length of 4.3 Å

The shortest interionic distance between Cs+ and Brions is

_-Pl. explain with soln

Posted by Aashka Shah (May 08, 2017 11:25 a.m.) (Question ID: 5159)

  • Answers:
  • Solution: 

    rc + ra = {tex}\sqrt 3a\over 2{/tex}

    => {tex}r_c + r_a = {\sqrt 3 \times 4.3\over 2}{/tex}{tex}3.72 A^°{/tex}

    Answered by Payal Singh (May 08, 2017 11:39 a.m.)
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Is there some method of charging a conductor without rubbing it with another object and without bringing it into contact with a charged body?

Posted by Nahla Saman (May 07, 2017 8:15 p.m.) (Question ID: 5152)

  • Answers:
  • Yes method of induction.

    Just bring the charged body closer to another uncharged body,

    Induction charging is a method used to charge an object without actually touching the object to any other charged object.

    Answered by Payal Singh (May 07, 2017 10:53 p.m.)
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