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    • Posted by Bhumika Jaiswal 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 4 years ago

    Crystallization can be defined as the process through which the atoms/molecules of a substance arrange themselves in a well-defined three-dimensional lattice and, consequently, minimize the overall energy of the system. 

    Crystallization Process

    1. The solution is heated in an open container
    2. The solvent molecules start evaporating, leaving behind the solutes
    3. When the solution cools, crystals of solute start accumulating on the surface of the solution
    4. Crystals are collected and dried as per the product requirement
    5. The undissolved solids in the liquid are separated by the process of filtration
    6. The size of crystals formed during this process depends on the cooling rate.
    7. A large number of tiny crystals are formed if the solution is cooled at a fast rate
    8. Large crystals are formed at slow cooling rates

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    • Posted by Bhumika Jaiswal 4 years ago

    CBSE > Class 09 > Science
    • 3 answers

    Acbu Roy 4 years ago

    movement, or a tendency to move, towards a centre of gravity, as in the falling of bodies to the earth.

    0Thank You

    Nandini Sharma 4 years ago

    All the objects in universe attract each other . The force of attraction between the objects is called the force of gravitation

    1Thank You

    Yogita Ingle 4 years ago

    Gravitation is the force of attraction between two objects in the universe. Gravitation may be the attraction of objects by the earth. This force is proportional to the product of masses of the objects and inversely proportional to the square of the distance between them. It is independent of the medium.

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    • Posted by Samrudh S Naik 4 years ago

    CBSE > Class 09 > Science
    • 2 answers

    Yogita Ingle 4 years ago

    Chromatography is the technique used for separation of those solutes that dissolve in the same solvent.
    To understand how this technique can be used let us perform an activity.
    Take a thin strip of filter paper. Draw a line on it using a pencil, approximately 3 cm above the lower edge as shown in figure(a). Put a small drop of ink (water soluble, that is, from a sketch pen or fountain pen) at the centre of the line. Let it dry. Lower the filter paper into a jar/glass/ beaker/test tube containing water so that the drop of ink on the paper is just above the water level, as shown in Fig(b) and leave it undisturbed.
    Watch carefully, as the water rises up on the filter paper. Now observe that the coloured component that is more soluble in water, rises faster and in this way colours get separated.

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    Pooja Chamoli 4 years ago

    hi

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    • Posted by Ani Matcha 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Udita Singh 4 years ago

    Coriolis force is an inertial force that acts on objects that are in motion within the frame of reference that rotates with respect to an inertial force ...

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    • Posted by Dhruv Soni 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Manalisha Majhi 4 years ago

    What is this

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    • Posted by Padmini Goswami 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Tanu Prajapati 4 years ago

    U = 108 km/h => 108×5/18 => 6×5 => 30 m/s v = 0m/s t = 4sec therefore , a = (v-u)/t =>a = (0-30)/4 => a = -30/4 => -7.5 m/s² force = mass × acceleration force = 1000 kg × (-7.5) m/s² force = -7500 kg m/s² => force = -7500 N negative sign denotes opposing force

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    • Posted by Ayush Rawat 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Tanu Prajapati 4 years ago

    m=mass u=initial velocity v= final velocity Now, m1= 1500kg m2=1000kg u1=25m/s u2=15m/s v1=20m/s v2=? Formula m1u1+m2u2= m1v1+m2+v2 1500*25+1000*15= 1500*20+1000*v2 37500+15000=30000+1000v2 52500=30000+1000v2 52500-3000=1000v2 22500=1000v2 22500/1000=v2 v2= 22.5m/s Thus, velocity of car 'B' after collision is 22.5m/s.

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    • Posted by Suman Kumar 4 years ago

    CBSE > Class 09 > Science
    • 2 answers

    Yogita Ingle 4 years ago

    To achieve the room temperature, the ice at 273 K will absorb latent heat as well as thermal energy. Water at a temperature of 273 K would just absorb heat energy to achieve room temperature. Thus, water at 273 K will absorb less environmental heat energy than ice at 273 K. Therefore ice at 273 K more effective in cooling than water at the same temperature.

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    Suman Kumar 4 years ago

    Ice at 273k has less energy than water (although both are at the same temperature)water possesses the addtional latent heat of fusion Hence ,at 273k ,ice is more effective in colling than water

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    • Posted by Meghan Shah 4 years ago

    CBSE > Class 09 > Science
    • 0 answers
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    • Posted by Jitu Machhar 36 4 years ago

    CBSE > Class 09 > Science
    • 3 answers

    Anmol Raushan 4 years ago

    CFC - Chlorofluorocarbon

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    Shivansh Khare 4 years ago

    chlorofluorocarbons

    0Thank You

    Khadija Khan Khan 4 years ago

    Air pollution and factory's chemical

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    • Posted by Palak Pandey 4 years ago

    CBSE > Class 09 > Science
    • 2 answers

    Palak Pandey 4 years ago

    Thanks Anushka ?

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    Anushka Agarwal 4 years ago

    See! For your convenience, you can even write ratio form into a for of division! So it will be like: 40/12/48 Now, these numbers can be divisible only when each no. is divisible by the same no., here, the no. is 4! So, when we divide 40 by 4, we get 10. 12 by 4=3 48 by 4=12 And thus, the ans= 10:3:12 Hope it helps!!

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    • Posted by Trishla Jain 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Student 10Th 4 years ago

    Conservation of linear momentum gives, m 1 ​ v 1 ​ +m 2 ​ v 2 ​ =0 m 1 ​ v 1 ​ =−m 2 ​ v 2 ​ v 1 ​ = m 1 ​ −m 2 ​ v 2 ​ ​ Given, m 1 ​ =10g=( 1000 10 ​ )kg, m 2 ​ =1 kg, v 2 ​ =−5m/s ∴v 1 ​ = 10/1000 +1×5 ​ or v 1 ​ =500m/s.

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    • Posted by Мυѕкαи ? 4 years ago

    CBSE > Class 09 > Science
    • 4 answers

    Мυѕкαи ? 3 years, 10 months ago

    Thanks to you all

    0Thank You

    Dr.Riya Bhanushali 4 years ago

    Plant cell has 1 large vacuole whereas animal cell has many small vacuoles Plant cell has cell wall whereas animal cell doesn't Plant cell has perifera nucleus i.e nucleus is not at centre whereas nucleus is at centre in animal cell Examples of plant cell - Meristem atic cells Examples of animal cell - Nerve cell Hope it helps you?

    1Thank You

    Vasudha Kakkat 4 years ago

    Plant cell has cell wall but animal cell do not have. Best difference

    1Thank You

    Aryya Banik 4 years ago

    The best answer Plant cells are found in plants animal cells are found in animals

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    • Posted by Rohith Dk 4 years ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Rohith Dk 4 years ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Gokul Settu 4 years ago

    CBSE > Class 09 > Science
    • 2 answers

    Anmol Raushan 4 years ago

    Initial velocity (u)- 0m/s Final velocity (v) - 5 m/s Time - 1 sec By 2nd equation of motion: s=ut + ½at²(a=5-0/1=5m/s²) s=0x1+½5x(1)²= 0+2.5x1=2.5m Distance is 2.5 m

    1Thank You

    Anubhav Singh 4 years ago

    Initial velocity(u) = 0m/s Final velocity(v) = 5m/s Time=1s Acceleration = v-u/t = 5m/s - 0m/s/1s = 5m/s/1s = 5m

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    • Posted by Pranjal Mirg 4 years ago

    CBSE > Class 09 > Science
    • 3 answers

    Aryya Banik 4 years ago

    Because chromatography prevents the objects from getting charred .

    1Thank You

    Yogita Ingle 4 years ago

    Evaporation: It is used for recovering dissolved solid substances from solutions by evaporating the solvent and the solute is left behind.

    Chromatography: It is an advanced technique of separation in which individual components of a mixture are separated from each other using the property of differential migration (different rates of flow).

    0Thank You

    Rooh Choudhary 4 years ago

    Because the substance after evaporation have some impurities but after chromatography you will get pure substance

    3Thank You

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    • Posted by Naman Pandey 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Rooh Choudhary 4 years ago

    Triatomic molecules are molecules composed of three atoms, of either the same or different chemical elements. Examples include H2O, Co2, HCN

    2Thank You

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    • Posted by Balu J 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Naman Pandey 4 years ago

    Muscle cells are excitable; they respond to a stimulus. They are contractile, meaning they can shorten and generate a pulling force. When attached between two movable objects, in other words, bones, contractions of the muscles cause the bones to move.

    2Thank You

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    • Posted by 9-A Vasu Agarwal 4 years ago

    CBSE > Class 09 > Science
    • 3 answers

    Abhishek Chaudhary 4 years ago

    Mare chote se pyare Bhai question pura send Kar karo

    2Thank You

    Disha Matta 4 years ago

    Complete your question

    1Thank You

    Parth Bajpai 4 years ago

    Yes

    1Thank You

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    • Posted by Roshine K.S 4 years ago

    CBSE > Class 09 > Science
    • 2 answers

    Disha Matta 4 years ago

    10 root 2 m

    1Thank You

    Sarita Panda 4 years ago

    10√2m

    1Thank You

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    • Posted by Abhishek Mahato 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Chinni Sathyam 4 years ago

    -They cannot be separated into their constituents by physical means -They have fixed composition -They have fixed metling and boiling point -They are homogeneous in nature -They do not show the properties of their constituents -Energy is involved

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    • Posted by Gopika.J ?? 4 years ago

    CBSE > Class 09 > Science
    • 2 answers

    Anmol Raushan 4 years ago

    Gravitation

    1Thank You

    Yogita Ingle 4 years ago

    A rotation is a circular movement of an object around a center of rotation. The moon revolves around the earth in a regular path. The gravitational attraction between the earth and the natural satellite holds it in its orbit even as the earth revolves around the earth. Rotation of moon around the earth repeats after regular intervals of time hence it is a periodic motion

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    • Posted by Pari Dalal 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 4 years ago

    Filtration is defined as the separation process in which insoluble impurities are separated from the solution. Filtration is done with the help of filter paper. Filtering mud from muddy water is an example of filtration.

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    • Posted by Sahil Yadav 4 years ago

    CBSE > Class 09 > Science
    • 3 answers

    Dr.Riya Bhanushali 4 years ago

    If the mass will be doubled then the force will be 4 times

    0Thank You

    Yogita Ingle 4 years ago

    Newtons' law for Gravitational force  F = G M1 M2 / d²
          M1 and M2 are masses of two bodies and d is the distance between them.

    1) As Force is directly proportional to the mass of each object, the force will be doubled.

    0Thank You

    Garv Dubey 4 years ago

    It will be same

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    • Posted by Shalu Yadav 4 years ago

    CBSE > Class 09 > Science
    • 4 answers

    Abhishek Chaudhary 4 years ago

    Atomic numbers : The atomic numbers of an element to the number of protons in the nucleus of the atom

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    Yogita Ingle 4 years ago

    Atomic number: The atomic number of an element is equal to the number of protons in the nucleus of its atom.

             e.g., Oxygen has 6 protons hence atomic no. = 6.

    1Thank You

    Muskan Singh 4 years ago

    Atomic number is the number of protons of an atom

    0Thank You

    Ayush Rawat 4 years ago

    Atomic number are the numbers of proton and electron in the substance.

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    • Posted by Sahil Yadav 4 years ago

    CBSE > Class 09 > Science
    • 2 answers

    Sarita Panda 4 years ago

    The scattering of a beam of light is known as Tyndall Effect.

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    Trishla Jain 4 years ago

    Its tyndall effect ....................If light is passed through a medium and its path can be seen, then the substance is said to show TYNDALL EFFECT

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    • Posted by Rengavadivelammal .C 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 4 years ago

    Mitosis

    Meiosis

    It is a type of cell division in which the daughter cells formed have exactly the same number of chromosomes as the parent cell.

    It is a type of cell division in which  the  number of chromosomes is reduced by half through the separation of homologous chromosomes in a diploid cell

    Two daughter cells are formed at the end of mitosis.

    Four daughter cells are formed at the end of meiosis. 

    The steps of mitosis are Interphase, Prophase, Metaphase, Anaphase, Telophase, and Cytokinesis

    The steps of meiosis are Interphase, Prophase I, Metaphase I, Anaphase I, Telophase I, Prophase II, Metaphase II, Anaphase II, Telophase II

    Crossing over does not occur 

    Crossing over occurs 

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    • Posted by Rengavadivelammal .C 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 4 years ago

    • The nucleus is small, round and membrane bound structure found in cell.
    • The fluid inside the nucleus surrounded by nuclear membrane is called nucleoplasm.
    • It controls the cell’s growth and reproduction because it contains cell's hereditary information.
    • It is covered by dual layer called nuclear membrane.
    • The nuclear membrane contains pores due to which materials can travel both inside the nucleus from its outer surrounding i.e. cytoplasm.
       
    • The nucleus contains some thread like structures called chromatin. It exists during the resting stage of cell.
    • The chromatin contains DNA (Deoxy-ribo nucleic acid), RNA (Ribo Nucleic acid) and proteins.
    • The nucleus contains some rod shaped structures in a cell that contains the hereditary information. They are called chromosome

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    • Posted by Shikha Maurya 4 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 4 years ago

    Eyepiece Tube holds the eyepieces in place above the objective lens. For safety reasons, you should never use a microscope in direct sunlight. This could hurt your eyes. Look through the eyepiece to see the specimen. ... Remember that you always need to keep both eyes open while looking into the microscope, because this will help you to avoid a painful condition called eyestrain.

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