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Why is it difficult to walk with high heels?

Posted by Trilochan Pathak (Jun 22, 2017 10:12 p.m.) (Question ID: 6111)

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  • In high heels the area in contact with the ground decrease and as we know that pressure is inversely proportion to area so if the area decreases the pressure increases due to which it is difficult to walk with high heels .

    Answered by Jahanvi Choudhary (Jun 22, 2017 11:46 p.m.)
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Viruses can be :-

a. stored

b. crystallised

c. isolated

d. all the above

Posted by Tiana Jangra (Jun 19, 2017 9:21 p.m.) (Question ID: 6039)

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  • b. crystallised

    Answered by Payal Singh (Jun 20, 2017 7:29 a.m.)
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What is a combustible substance whïch on burning produces a large amount of heat and light called?

Posted by Leena Suchdeo (Jun 19, 2017 5:55 p.m.) (Question ID: 6031)

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  • explosion

     

    Answered by Arin Tumbagi (Jun 19, 2017 6:04 p.m.)
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What is phototrophism

Posted by Umesh Thakur (Jun 18, 2017 11:43 p.m.) (Question ID: 6016)

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  • Phototropism is the bending of plants towards the light or sunlight

    Answered by Vedika Gautam (Jun 19, 2017 7:44 a.m.)
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HOTS - How does a candle gives light?explain it.

Posted by Leena Suchdeo (Jun 18, 2017 7:05 p.m.) (Question ID: 6005)

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  • Candle first melt and vapourise than burn to give light in presnce of oxygen to give light and heat.

    Answered by RAJENDRA SINGH (Jun 22, 2017 8:39 p.m.)
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Match the columns. Column A                                                      1Combustible substance                                                                                          2 carbon dioxide                                               3 Hydrocarbons                                                 4 Hottest part of the candle flame                                                                      ColumnB                                                             1 fire fighting                                                    2 fuels                                                                3 complete combustion                                   4 kilojoule per gram                                          5 paper

Posted by Leena Suchdeo (Jun 18, 2017 7:03 p.m.) (Question ID: 6004)

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What is a combustible substance which on burning produces a large amount of heat and light called?

Posted by Leena Suchdeo (Jun 18, 2017 6:54 p.m.) (Question ID: 6003)

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  • Those substances that burn in presence of oxygen to give heat and light are called cumbustible substance. The bond present between molecule of these substance breaks to give  energy in form of heat and light.

    Answered by RAJENDRA SINGH (Jun 22, 2017 8:42 p.m.)
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Name the gaseous fuel obtained from cattle dung.

Posted by Leena Suchdeo (Jun 18, 2017 6:53 p.m.) (Question ID: 6002)

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  • Biogas

    Answered by Payal Singh (Jun 18, 2017 10:58 p.m.)
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What are the drawbacks of seeds being unevenly distributed in a field ?

Posted by Leena Suchdeo (Jun 17, 2017 8:09 p.m.) (Question ID: 5987)

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  • There will be a competition between the plants for water,sunlight and space.

    Answered by Archith jayalal (Jun 19, 2017 6:37 p.m.)
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Over what area should a force of 100N act to produce a pressure of 500pascal?

Posted by Seema Singla (Jun 17, 2017 4:47 p.m.) (Question ID: 5984)

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  • Given 

    Force = 100N

    Pressure = 500Pascel

    We know 

    {tex}Pressure = {force \over Area}{/tex}

    So,

    {tex}500={100\over area}{/tex}

    {tex}=> area={100\over 500}{/tex}

    {tex}=> area=0.2 m^2{/tex}

    Answered by Payal Singh (Jun 17, 2017 7:15 p.m.)
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Which part of a candle flame is non - luminous?

Posted by Leena Suchdeo (Jun 17, 2017 4 p.m.) (Question ID: 5983)

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  • The outermost zone is the hottest among all zones and is blue in color, and this is due to complete combustion. It is the non-luminous part of the flame.

    Answered by Payal Singh (Jun 17, 2017 7:16 p.m.)
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HOTS- Comment on the statement "Fossils in your car"

Posted by Leena Suchdeo (Jun 17, 2017 3:19 p.m.) (Question ID: 5978)

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  • The statement simply refers to fact thatfuel in our car is a fossil fuel

    Answered by Umesh Thakur (Jun 17, 2017 7:21 p.m.)
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Give one word answer.The combustion reaction that takes place in the presence of insufficient air .

Posted by Leena Suchdeo (Jun 17, 2017 3:16 p.m.) (Question ID: 5977)

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  • It is called Incomplete Combustion.

    In this process, Carbom monoxide or carbon isnproduced in place of carbon dioxide.

    Answered by Rashmi Bajpayee (Jun 17, 2017 5:04 p.m.)
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HOTS - Why do electric plugs not melt even if the wires inside them get overheated?

Posted by Leena Suchdeo (Jun 17, 2017 3:12 p.m.) (Question ID: 5976)

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  • Electric plugs are made of hard metal like Bakelite that have a high melting point. Therefore the electric plugs do not melt even at high temperature.

    Answered by Rashmi Bajpayee (Jun 17, 2017 5:29 p.m.)
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HOTS - Silver is the best electrical conductor.Why is it not used for making electric wires/ cables?

Posted by Leena Suchdeo (Jun 16, 2017 10:13 p.m.) (Question ID: 5960)

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  • I agree with Tannu chauhan silver is very costly if one puts a wire made up of silver it will be very disturbing for him to pay money 

    Answered by Umesh Thakur (Jun 17, 2017 3:04 p.m.)
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  • As silver is very costly it is not used for making electrical wires

     

    Answered by Tannu chauhan (Jun 16, 2017 11:49 p.m.)
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Name the gases which cause acid rain

Posted by Leena Suchdeo (Jun 16, 2017 10:10 p.m.) (Question ID: 5959)

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  • The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and nitrogen (NOx). Acid rain usually forms high in the clouds where sulfur dioxide andnitrogen oxides react with water, oxygen, and oxidants. this mixture forms a mild solution of sulfuric acid and nitric acid.

    Answered by Sachin Kumar (Jun 17, 2017 6:14 a.m.)
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Give one word answer .The process in which a substance combines with oxygen producing heat and light .

Posted by Leena Suchdeo (Jun 16, 2017 10:09 p.m.) (Question ID: 5958)

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  • Combustion

    Answered by Sachin Kumar (Jun 17, 2017 6:16 a.m.)
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HOTS - How does a candle gives light ?explain it

Posted by Leena Suchdeo (Jun 16, 2017 10:02 p.m.) (Question ID: 5956)

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Give one word answer .The combustion reaction that takes place in the presence of insufficient air.

Posted by Leena Suchdeo (Jun 16, 2017 9:59 p.m.) (Question ID: 5955)

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  • roasting

    Answered by RAJENDRA SINGH (Jun 22, 2017 8:48 p.m.)
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The ignition temperature of a substance is lower than the room temperature.What will happen?

Posted by Leena Suchdeo (Jun 16, 2017 7:12 p.m.) (Question ID: 5952)

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  • If the ignition temperature of a substance (minimum temperature at which a substance catches fire) is lower than the room temperature then it will burn spontaneously i.e. no external substance is required to burn the fuel.

    This kind of combustion is known as spontaneous combustion.

    Answered by Payal Singh (Jun 16, 2017 8:47 p.m.)
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How does a candle gives light?Explain it

Posted by Leena Suchdeo (Jun 16, 2017 7:10 p.m.) (Question ID: 5951)

  • Plz tell me a short ans itz very long plz

    Posted by Leena Suchdeo (Jun 16, 2017 9:48 p.m.)
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  • Plz tell me a short answer itz very long plz

    Answered by Leena Suchdeo (Jun 16, 2017 9:42 p.m.)
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  • Candles really are an amazing lighting system -- the fuel itself is the package. There are two parts that work together in a candle:

    • The fuel, made of some sort of wax.
    • The wick, made of some sort of absorbent twine..

    The wick needs to be naturally absorbent, like a towel, or it needs to have a strong capillary action (as in glass fiber wicks used in oil lamps). If you buy a length of un-waxed wick at a craft store and play with it, you will find that it feels like soft string and absorbs water very well. This absorbency is important in a candle because the wick needs to absorb liquid wax and move it upward while the candle is burning.

    Answered by Payal Singh (Jun 16, 2017 8:53 p.m.)
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Name a fuel that burns without giving off water vapour .Give reason.

Posted by Leena Suchdeo (Jun 16, 2017 7:09 p.m.) (Question ID: 5950)

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  • The fuel that burns without giving out water vapour is coke which is a pure form of carbon. It has high carbon content and low amount of hydrocarbon.

    Normally water vapour is given off when there is presence of hydrogen in a given fuel and as coke have very low hydrogen content. Therefore water vapour is not given out .

    Itsimply burns with the evolution of carbon dioxide.

    {tex}C+O_2 \ \to CO_2{/tex}

    Answered by Payal Singh (Jun 16, 2017 8:49 p.m.)
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Comment on the statement " Fossils in your car"

Posted by Leena Suchdeo (Jun 16, 2017 6:57 p.m.) (Question ID: 5949)

  • The statement simply refers to the fact that the fuel in our Car is a fossil fuel

     

    Posted by Umesh Thakur (Jun 17, 2017 3:27 p.m.)
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little sonu wants a ride on parachute . his father checked  the rope of parachute & confirmed it is made of nylon . why cant we use rayon ropes

 

Posted by rakesh kanneeswaran (Jun 14, 2017 9:24 p.m.) (Question ID: 5911)

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  • Nylons have high tensile strength therefore they are more durable for whereas rayons are not as durable and thus ropes of rayon can break if large stress in applied.

     

    Answered by SIDDHANT GANGLY (Jun 14, 2017 9:41 p.m.)
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why does rayon have lustrous

 

Posted by rakesh kanneeswaran (Jun 14, 2017 9:18 p.m.) (Question ID: 5910)

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How increasing crops affect the environment

Posted by Smita Singh (Jun 10, 2017 3:46 p.m.) (Question ID: 5832)

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  • Increasing crops affect the environment as for the production of crops various pesticides and fertilisers are required which may alter the quality of the environment

    Answered by Pulkit Tiwari (Jun 10, 2017 4:36 p.m.)
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What is vector quantity ?

 

 

Posted by Seema Singla (Jun 10, 2017 10:33 a.m.) (Question ID: 5819)

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  • Vector quantity is that quantity in which a body has both magnitude as well as direction. A vector has more than one number associated with it Like velocity, 

    Answered by Geeta Gupta (Jun 10, 2017 12:02 p.m.)
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What is vector quantity?

Posted by Seema Singla (Jun 10, 2017 10:31 a.m.) (Question ID: 5818)

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  • A vector quantity is a quantity of something which possesses both magnitude and direction. Magnitude is simply the size or amount of the quantity. For example, the magnitude of the quantity eight miles per hour is eight. Direction is meant in the ordinary sense, where the quantity is headed.

    Answered by Payal Singh (Jun 10, 2017 1:06 p.m.)
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what happened to the fluid friction, as the speed of the object moving through it increase? 

Posted by Ayush Ray (Jun 10, 2017 9:16 a.m.) (Question ID: 5814)

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  • The magnitude of frictional force or drag exerted by a fluid on an object moving through it is directly proportional to speed of the object.

    Higher the speed of an object moving to a fluid ,greater will be the frictional force acting on it .

    Answered by Payal Singh (Jun 10, 2017 9:48 a.m.)
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what is frictional force?

 

Posted by Sarv123 AnandMishra (May 30, 2017 10:58 a.m.) (Question ID: 5573)

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  • Frictional Force refers to the force generated by two surfaces that contacts and slide against each other.

    These forces are mainly affected by the surface texture and amount of force impelling them together.

    The angle and position of the object affect the amount of frictional force.

    Answered by Payal Singh (May 30, 2017 12:02 p.m.)
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