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What is acne?

Posted by Shikha Choudhary (Jun 26, 2017 8:41 p.m.) (Question ID: 6192)

  • Good question

    Posted by Onkar Yadav (Jun 26, 2017 11:54 p.m.)
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  • When oil glands secrets more it results in acne

    Answered by Onkar Yadav (Jun 26, 2017 11:52 p.m.)
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  • Acne or acne vulgaris is a long term skin condition when hair follicles are clogged with dead skin cells and oil from skin. It is characterized by pimples, blackheads and possible scarring.

    It affects areas of the skin with a relatively high number of oil glands , including the face, upper part of the chest, and back.

    Genetics and bacterial infections are the main contributing factors for acne. It can be treated by medications such as benzoyl peroxide, retinoids, etc.

    Answered by Pritha Vashisht (Jun 26, 2017 11:52 p.m.)
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What is motion ?

 

Posted by Ajay Baraskar (Jun 26, 2017 8:09 p.m.) (Question ID: 6191)

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  • A body is said to be in motion when its position changes with respect to a stationary object taken as reference point.

    Answered by SANKHADIP BAG (Jun 26, 2017 8:53 p.m.)
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Difference between projectile and circular motion. 

Posted by Pradhyumn Soni (Jun 26, 2017 7:47 p.m.) (Question ID: 6189)

  • Good question

    Posted by Onkar Yadav (Jun 26, 2017 11:56 p.m.)
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An object is moving along a circular path of radius R what will be the distance covered and the displacement of the object after three-fourth of revolution

Posted by sweety purohit (Jun 26, 2017 10:25 a.m.) (Question ID: 6184)

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When we add few crystal of copper sulphate to Waterford some time the solution turns blue. Name the process

Posted by Daksh Sharma (Jun 24, 2017 2:32 p.m.) (Question ID: 6152)

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  • diffusion is the process because copper sulphate mixes up in the water and the solution turns blue.

    Answered by Payal Singh (Jun 24, 2017 5:22 p.m.)
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Which of the following object can be most compressed and why? Coalpowder ice cream and milk 

 

Posted by Daksh Sharma (Jun 24, 2017 2:27 p.m.) (Question ID: 6151)

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  • Milk can be most compressed because there is more space between the subatomic particles of milk in comparison of coalpowder and ice cream.

    Answered by Ashutosh Kumar (Jun 24, 2017 6:10 p.m.)
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How is soap a compound?

 

Posted by Ayushi Bhardwaj (Jun 24, 2017 12:06 p.m.) (Question ID: 6145)

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  • Because it is made up of more than two element.

     

     

    Answered by Daksh Sharma (Jun 24, 2017 2:31 p.m.)
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Does unicellular organisms means organisms with only one cell or with many cells of one kind?

Posted by Hanan Akhtar (Jun 23, 2017 10:33 p.m.) (Question ID: 6139)

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  • Unicellular organisms are those organisms which made up of only one cells like amoeba and paramecium

    Answered by Deepanshu Sharma (Jun 24, 2017 7:59 p.m.)
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  • Unicellular organisms means the organism contains one cell.like Ameoba

    Answered by Kirtti RANJAN MISHRA (Jun 24, 2017 7:21 a.m.)
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Rubber band changes it's shape on stretching then why we call it solid?

Posted by Harshit Garg (Jun 22, 2017 2:16 p.m.) (Question ID: 6100)

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  • Yes, rubber band can be regarded as solid. A rubber band undergoes a change in shape on stretching i.e. on applying pressure. When the pressure is released, it regains its original shape. Such solids are known as elastics.

    Answered by Payal Singh (Jun 22, 2017 7:14 p.m.)
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Name the tissue that forms the oesophagus.

Posted by Deepanshu Sharma (Jun 21, 2017 12:20 a.m.) (Question ID: 6065)

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  • Esophagus is made of muscular tissue and cartilage ( connective tissue).

    Answered by RAJENDRA SINGH (Jun 22, 2017 8:34 p.m.)
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Name the tissue that forms the pinna of the ear .

Posted by Deepanshu Sharma (Jun 21, 2017 12:19 a.m.) (Question ID: 6064)

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  • Pinns of ear is made up of cartilage a kind of connective tissue.

    Answered by RAJENDRA SINGH (Jun 22, 2017 8:36 p.m.)
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Name the tissue that forms the inner linning of the intestine. 

Posted by Deepanshu Sharma (Jun 21, 2017 12:05 a.m.) (Question ID: 6063)

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Because the gace in online test that they are . It is in online test - 1 in LS-Motion in class 9.............

 

Posted by abhinav ambatipudi (Jun 20, 2017 10:21 p.m.) (Question ID: 6062)

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Can displacement be equal to zero ? Can the magnitude of Displacement be greater than Magnitude of Distance ?

Posted by abhinav ambatipudi (Jun 20, 2017 10:20 p.m.) (Question ID: 6061)

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  • I do not agree with Payal ,displacement can be zero but distance and displacement can never be negative.

    Displacement will be zero if the initial and final position of the object is same.

    Answered by Sagar Tripathi (Jun 21, 2017 9:18 p.m.)
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  • Yes, Displacement can be zero. Also it can be negative.

    No, displacement can not be greater than distance because displacement is the short distance covered.

    Answered by Payal Singh (Jun 20, 2017 10:48 p.m.)
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In state of matter,  my mam said that, when we heat liquid, it will evaporate. But in a egg the yellowish colored part in inside the egg gets solid when heating can you explain how it happens briefly

 

 

Posted by K. V. Sakthivel K. V. Sakthivel (Jun 19, 2017 10:03 p.m.) (Question ID: 6040)

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  • The egg white is about 12 percent protein and the egg yolk itself is about 16 percent protein. This means that any alteration to the structure of these proteins will, in turn, significantly alter the structure of the entire egg.

    Denaturation is what happens when heat is applied to the eggs. Chemically, this is the process by which the chains of amino acids are changed from their original (or native) state.

    The heat coming from your stove denatures the protein by disrupting some of its bonds that held the molecule into shape.

    In the case of hard-boiled eggs, the proteins clump together and solidify, causing the egg white and yolk to harden.

    Answered by Payal Singh (Jun 19, 2017 10:23 p.m.)
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what is vector?

 

Posted by Arin Tumbagi (Jun 19, 2017 6:04 p.m.) (Question ID: 6033)

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  • If magnitude as well as direction of any quantity is defined then it is vector quantity

    Answered by Sagar Tripathi (Jun 20, 2017 9:30 p.m.)
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  • Its physical quantity having mag and dircn.

    Answered by Study Adda (Jun 19, 2017 6:47 p.m.)
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If the force of gravity of on mars is 3.8      ms-2  , what should be the wieght of an object on mars which has a mass of 10kg on earth?

Posted by Gourav Khandelwal (Jun 13, 2017 12:06 p.m.) (Question ID: 5885)

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  • Mass is constant at every place but the weight of the body varies according to the place where the body is.

    Answered by Shashant Ahuja (Jun 13, 2017 1:08 p.m.)
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why does sea diver wear special suits while going into the sea

Posted by vanshika singla (Jun 08, 2017 5:43 p.m.) (Question ID: 5764)

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  • As we know liquid pressure increases with the increase in depth of the sea. So divers wear special diving suits to withstand such high pressure preventing their body to be crushed and they can breathe normal air inside water.

    Answered by Geeta Gupta (Jun 09, 2017 9:42 p.m.)
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  • Because deep beneath the ocean ,the pressure increases which can push the divers back to the water surface level.So they wear a special dress which can withstand the pressure and move swiftly.

    Answered by Poulami Dasgupta (Jun 08, 2017 7:02 p.m.)
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why do some dead fishes float in water while other sink

Posted by vanshika singla (Jun 08, 2017 5:37 p.m.) (Question ID: 5763)

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  • Fish are slightly more denser than the water in which they swim. They are almost neutrally buoyant causing it to float. As we know pressure increases with water depth causing counteract fluctuations by using bladder present in fish. The amount of oxygen in the bladder determines the fish buoyancy. When the fish decompose after death if oxygen remains in the bladder it floats and if water then they sink until the gases build.

    Answered by Geeta Gupta (Jun 08, 2017 7:47 p.m.)
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which is the only organelle living in a prokaryote

Posted by Neeraj Sreenivasan (Jun 07, 2017 7:05 p.m.) (Question ID: 5736)

  • Prokaryotes contain Ribosomes which helps in the protein formation. They contain  70S Ribosomes and eukaryotes contain 80S Ribosomes.

    Posted by Swati Sohni (Jun 07, 2017 10:49 p.m.)
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  • Prokaryotic cells are very simple cells with fewer structures than eukaryotic cells; one primary difference is that they lack a nucleus. Bacteria are an example of prokaryotes.

    Answered by Payal Singh (Jun 07, 2017 8:16 p.m.)
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Draw animal cell and label ROUGH Endoplasmic reticulum, centroile and lysosomes

Posted by Gitishan Biswal (Jun 07, 2017 5:33 p.m.) (Question ID: 5732)

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  • Plant cell

    Answered by Payal Singh (Jun 07, 2017 5:33 p.m.)
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Which has more density honey or cotton ?

 

Posted by Sanjeev Kumar (Jun 04, 2017 7:09 p.m.) (Question ID: 5664)

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  • density= {tex}mass\over volume {/tex}

    Since mass is the same the only depended quantity is volume.

    Cotton can be compressed a lot so its volume decreases and since density varies inversely with volume it will be the maximum in cotton.

    Answered by Payal Singh (Jun 04, 2017 9:14 p.m.)
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The gas jar (a)containing a colourless is kept upside down over another gas jar (b)containing a reddish brown gas .The two jars are separated by a glass plate.       (A)name the two gases.                                   (B) what happened when glass plate removed.                                                            (C) name the phenomena after removing glass plate happened.                                     D) name a coloured solid and colorless liquid which could show  the same .

 

Posted by Jitu Kaushik (Jun 04, 2017 12:27 a.m.) (Question ID: 5655)

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  • (A) Gas jar A contains air while gas jar B conain bromine gas.

    (B) intermixing of gas will take place.

    (C) Diffusion

    (D) chalk and water

    Answered by RAJENDRA SINGH (Jun 09, 2017 9:04 p.m.)
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WHAT IS OSMOSIS ??????

Posted by Harsh Agarwal (May 31, 2017 1:31 p.m.) (Question ID: 5597)

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  • it can be defined as the process in which the molecules from lower concentration to higher concentraion at standard condition.

    Answered by Ankit Kumar (May 31, 2017 4:59 p.m.)
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What is covalent bonding? How to write the formula for covalent compounds?

Posted by NISHA TRIPATHI (May 31, 2017 11:53 a.m.) (Question ID: 5595)

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  • Ans. A covalent bond, also called a molecular bond, is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.

    Naming binary (two-element) covalent compounds is similar to naming simple ionic compounds. The first element in the formula is simply listed using the name of the element. The second element is named by taking the stem of the element name and adding the suffix -ide.

    Answered by Naveen Sharma (May 31, 2017 12:42 p.m.)
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What is meaning of tangentially

Posted by Sunil Yadav (May 30, 2017 6:18 p.m.) (Question ID: 5578)

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  • Tangentially means touching the circular path at one point that is perpendicular to radius of the circle.

    Answered by RAJENDRA SINGH (Jun 09, 2017 9:05 p.m.)
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Advantages of using graphs to study motion.

Posted by Ankush Tarafdar (May 29, 2017 4:03 p.m.) (Question ID: 5561)

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  • The following are the advantages ofbgraphs:

    •  Instantaneous values of the velocity of the body at different periods of time can be found.
    • The distance (displacement actually) travelled can be found easily by calculating the area below the graph.
    • The acceleration can be found by slope of graph.
    Answered by Payal Singh (May 29, 2017 4:11 p.m.)
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What is the difference b/was gas and vapour? give two example

 

Posted by Sanjeev Singh Tomar Tomar (May 22, 2017 1:48 p.m.) (Question ID: 5428)

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  • Ans.

    • Gas is one of the 4 states of matter which are solid, liquid, gas and plasma, vapor does not classify as such. It is just a substance. it is gaseous form.
    • Vapor can turn back and forth into liquid and solid states but a gas cannot
    • Gases cannot be see while vapors are visible
    • Vapors settle down on ground while gases do not
    Answered by Naveen Sharma (May 22, 2017 2:09 p.m.)
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A train 100m long moving on a straight line track passes in 5sec.find the speed of the train and the time taken to cross a bridge  500m long

Posted by Akshyata Singh (May 22, 2017 10:29 a.m.) (Question ID: 5426)

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  • Ans. length of train = 100 m 

    To pass a pole train ll cover the distance equal to its length

    So distance cover by train = 100 m

    Time taken = 5 s

    Speed of train = {tex}distance \ cover \over time \ taken{/tex} = {tex}100 \over 5 {/tex} = 20 m/s

     

    Total distance to cover to cross a bridge = length of bridge + length of train = 500 + 100 = 600 m

    Speed = 20 m/s

    time taken = {tex}distance \ cover \over speed{/tex} = {tex}600 \over 20 {/tex} =  30 s

    Answered by Naveen Sharma (May 22, 2017 12:53 p.m.)
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What do you understand by non uniform acceleration? 

Posted by Pradhyumn Soni (May 22, 2017 10:13 a.m.) (Question ID: 5424)

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  • Non-uniform Acceleration:- A body is said to have a non-uniform acceleration if its velocity increases by unequal amounts in equal intervals of time. Eg The speed or velocity of a car running on a crowded city road changes continuously.

    The velocity-time graph of a body having uniform acceleration is a curved line.

    Answered by Payal Singh (May 23, 2017 4:11 p.m.)
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