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    • Posted by Anubhav Pandey 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Khushi Boora 7 years, 2 months ago

    Because there R is zero so F will also zero.

    1Thank You

    Aman Anshuman 7 years, 2 months ago

    Please correct your Q. At the centre the 'g' is higher . Because - F = G×M×m/R2 . So when distance increases the g becomes weaker & when g decreases the g becomes higher by the square of distance.

    1Thank You

    Uttam Singh Negi 7 years, 2 months ago

    and their is less mass

    1Thank You

    Uttam Singh Negi 7 years, 2 months ago

    because their is force atraction in center

    1Thank You

    ANSWER

    • Posted by Hari Nandana 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Anubhav Pandey 7 years, 2 months ago

    Power of electric bulb = 60 W = 0.06 KW Time used, t = 6 h Energy = power × time taken = 0.06 kW × 6 h = 0.36 kW h = 0.36 'units'. The energy consumed by the bulb is 0.36 'unit'.

    2Thank You

    ANSWER

    • Posted by Ayesha Siroha 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Sandeep Sahu 7 years, 2 months ago

    Naming of the organism into specific group

    1Thank You

    ANSWER

    • Posted by Suryansh Singh 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Vedant Damani 7 years, 2 months ago

    An anode ray is a beam of positive ions that is created by certain types of gas-discharge tubes. They were first observed in Crookes tubes during experiments by the German scientist Eugen Goldstein, in 1886. Later work on anode rays by Wilhelm Wien and J. J. Thomson led to the development of mass spectrometry.

    1Thank You

    ANSWER

    • Posted by Akshat Shukla 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Sir Ap 7 years, 2 months ago

    Bhai sidha google se copy paste mat kiya karon

    1Thank You

    Gaurav Seth 7 years, 2 months ago

    On the basis of physical properties, matter is classified as solids, liquids and gases. On the basis of chemical properties, matter is classified as elements, compounds and mixtures.

          •  Solids- Solids have strong molecular force and a definite shape and size solids can neither flow nor be compressed.

          •  Liquids- Liquids have weak intermolecular flow and large intermolecular spaces. Liquids do not have a definite shape but can flow.

          •  Gases- Gases have weak intermolecular flow, high compressibility, and no definite shape and volume.

    1Thank You

    ANSWER

    • Posted by Ritik Tevathiya 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Sir Ap 7 years, 2 months ago

    Bhai sidha google se copy paste mat kiya karo

    0Thank You

    Ritik Tevathiya 7 years, 2 months ago

    Beam balance

    0Thank You

    Gaurav Seth 7 years, 2 months ago

    The mass of the object means the amount of material in the object and weight of object is the measure of force on the object by gravity.
    The beam balance,spring balance is used to measure the mass.The analytical balance is used for precise measurement of mass.
    A spring balance measures weight.It requires gravitational field to work.

    1Thank You

    ANSWER

    • Posted by Aanchal Jaiswal 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Sir Ap 7 years, 2 months ago

    Bhai sidha google se copy paste mat kiya karo

    1Thank You

    Yogita Ingle 7 years, 2 months ago

    Simple Permanent Tissue: Simple permanent tissue is composed of similar types of cells. Simple permanent tissues are of three types, viz. parenchyma, collenchyma and sclerenchyma.
    (1) Parenchyma: The cells of parenchyma have thin cell wall. They are loosely packed; with lot of intercellular spaces between them. Parenchyma makes the largest portion of a plant body. Parenchyma mainly works are packing material in plant parts. The main function of parenchyma is to provide support and to store food. In some plant parts, parenchyma has chlorophyll as well. In that case, parenchyma carries out photosynthesis and is then termed as chlorenchyma. In aquatic plants, large air cavities are present in parenchyma. This provides buoyancy to the plant, and then the parenchyma is known as aerenchyma.
    (2) Collenchyma: The cell wall of collenchyma is thickened at corners. Intercellular spaces are very few. Collenchymas provides some degree of structural rigidity with flexibility. Collenchymas is present in leaf stalk; below the epidermis. Due to this, the leaf talk can easily bend but does not break.
    (3) Sclerenchyma: The cell wall in sclerenchyma is highly thickened all around. The cells are dead and intercellular space is absent. Sclerenchyma provides structural rigidity to plant parts. Bark is composed of sclerenchyma. Another example of sclerenchyma can be seen in the coconut husk.

    1Thank You

    ANSWER

    • Posted by Aanchal Jaiswal 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Bhoomika S 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Sir Ap 7 years, 2 months ago

    Bhai sidha google se copy paste mat kiya karo

    0Thank You

    Ritik Tevathiya 7 years, 2 months ago

    A thin gold foil sheet is taken and alpha particles are pass through them what happens some alpha particles pass straight ,some deflect by small or large angle and some bounce back . These concludes that some space is present in an atom ,some solid substance is present called nucleus, and nucleus have positively charge particles.

    0Thank You

    ANSWER

    • Posted by Drishi Jain 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Abhishek Sharma 7 years, 2 months ago

    Find video lessons, notes, papers, syllabus, solutions to doubts & more Home / Doubts and Solutions/ICSE/Class 10/Physics How to prove law of conservation of energy? Asked by Sushant Kumar9th March 2014, 3:17 PM Answered by Expert Answer: Law of conservation of energy states that the energy can neither be created nor destroyed but can be transformed from one form to another. Let us now prove that the above law holds good in the case of a freely falling body. Let a body of mass 'm' placed at a height 'h' above the ground, start falling down from rest. In this case we have to show that the total energy (potential energy + kinetic energy) of the body A, B and C remains constant i.e, potential energy is completely transformed into kinetic energy. conservation of energy Body of mass m placed at a height h At A, Potential energy = mgh Kinetic energy = 0 [the velocity is zero as the object is initially at rest] Total energy at A = Potential energy + Kinetic energy. Total energy at A = mgh …1 At B, Potential energy = mgh = mg(h - x) [Height from the ground is (h-x)] Potential energy = mgh - mgx Kinetic energy = ½ mv2 The body covers the distance x with a velocity v. Kinetic energy = mgx Total energy at B = Potential energy + Kinetic energy Total energy at B = mgh …2 At C, Potential energy = m x g x 0 Potential energy = 0 Kinetic energy = ½ mv2 The freely falling body has covered the distance h. Here, u=0, a=g and s=h Kinetic energy = ½ mv2 Kinetic energy = mgh Total energy at C = Potential energy + Kienetic energy Total energy at C = mgh …3 It is clear from equations 1, 2 and 3 that the total energy of the body remains constant at every point. Thus, we conclude that law of conservation of energy holds good in the case of a freely falling body.

    0Thank You

    ANSWER

    • Posted by Drishi Jain 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Ritik Tevathiya 7 years, 2 months ago

    Megawatt

    1Thank You

    Yogita Ingle 7 years, 2 months ago

    • SI unit of Power is Joule per second or Js1.
    • 1 watt is the power when 1J of work is done in 1s.
    • The bigger unit of power is Kilowatt and represented by kW.
      1kW = 1000W
    • Some another units to measure power are:

     1 Megawatt = 106 watt

     1 horse power = 746 watt

    4Thank You

    ANSWER

    • Posted by Rampati Mahto 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 7 years, 2 months ago

    Micronutrients

    Macronutrients

    Required in minute quantities.

    Required in large quantities.

    Play a pivotal role in disease prevention.

    Play a pivotal role in providing energy.

    Deficiency of micronutrients can cause Anaemia, Scurvy, Goitre, etc.

    Deficiency of macronutrients can cause protein-energy malnutrition, Kwashiorkor, marasmus, etc.

    Excessive intake of Vitamins harms the liver, mild nerve damage, etc.

    Excessive intake of macronutrients results in cardiovascular disease, obesity, diabetes, etc.

    Antioxidants, Minerals, and Vitamins are examples of macronutrients.

    Proteins, fiber, carbohydrates, and fats are examples of micronutrients.

    Micronutrients are mainly obtained from vegetables, fruits, cashews, eggs, all dairy products, etc.

    Macronutrients are mainly obtained from legumes, beans, pulses, soy, tofu, cereals, potatoes, fish as nuts, oilseeds, milk, cheese, etc.

    Their concentration is less than 1mg/gm.

    Their concentration is equal to 1 mg or 1000 microgram.

    3Thank You

    ANSWER

    • Posted by Rahul Saini 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Ritik Tevathiya 7 years, 2 months ago

    Electronic configurtaionof sodium is 2,8,1

    0Thank You

    Ankit Ambasta 7 years, 2 months ago

    Sodium - K(2) L(8) M(2)& Na+ - K(2) L(8)

    0Thank You

    Ketan Garg 7 years, 2 months ago

    K2

    0Thank You

    Ankit Ambasta 7 years, 2 months ago

    Sodium -K(2)L(8)M(1) Na+ K(2)L(8)

    1Thank You

    ANSWER

    • Posted by Vaish Shukla 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Ankit Ambasta 7 years, 2 months ago

    746W= 1horse power

    2Thank You

    Yogita Ingle 7 years, 2 months ago

    Horsepower is the imperial (British) unit of power, now replaced by the watt - the new SI unit. One horsepower is the work done at the rate of 550 foot-pounds per second and it is equivalent to 746 watts. Horsepower was first used by James Watt, who employed it to compare the power of steam engines with that of horses.

    2Thank You

    ANSWER

    • Posted by Kittu Kashyap 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 7 years, 2 months ago

    The concentration of a solution is the amount of solute present in a given amount (mass or volume) of solution, or the amount of solute dissolved in a given mass or volume of solvent. Two ways of expressing the concentration of a solution :
    (i) Mass by mass percentage of a solution = Mass of solute ÷  Mass of solution x 100
     (i) Mass by volume percentage of solution = Mass of solute ÷ Volume of solution x 100

    1Thank You

    ANSWER

    • Posted by Ankit Ambasta 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Yogita Ingle 7 years, 2 months ago

    Antibodies - a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognises as alien, such as bacteria, viruses, and foreign substances in the blood.​

    1Thank You

    Deepak Kumar 7 years, 2 months ago

    A substance that the body produce in the blood to fight the disease is called antibodies

    2Thank You

    ANSWER

    • Posted by Aman Kumar 5 years, 11 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Yogita Ingle 7 years, 2 months ago

    <div>Meristematic tissue</div> <div>Permanent tissue</div>
    <div>i. Cells of meristematic tissue divide repeatedly.</div> <div>i. Cells of permanent tissue do not divide and are derived from the meristematic tissue.</div>
    <div>ii. The cells are not differentiated.</div> <div>ii. The cells are differentiated.</div>
    <div>iii. The cells are isodiametric.</div> <div>iii. The cells are variable in shape.</div>
    <div>iv. Vacuoles are not present.</div> <div>iv. In mature cells, large vacuoles are present.</div>

    1Thank You

    Ankit Ambasta 7 years, 2 months ago

    Tissues that can divide are known as meristamatic tissue. Tissues that are derived from meristemetic and lost their ability to divide known as permanent tissue.

    1Thank You

    ANSWER

    • Posted by Nityanand Priyadarshi 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Anshuman Dwivedi 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Khushi Boora 7 years, 2 months ago

    I think no work is done because force is applied on our downward direction and magnitude of displacement ia in our left or right side so it forms a right angle

    1Thank You

    Arjun Bhatty 7 years, 2 months ago

    Yes work is done

    0Thank You

    ANSWER

    • Posted by Abhi Kumar 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Nityanand Priyadarshi 7 years, 2 months ago

    If ur que is proton then my ans Proton is a subatomic particles of atom whic contain + charge in it .it is located in nucleus

    0Thank You

    Aman Anshuman 7 years, 2 months ago

    That's proyon or proton .

    0Thank You

    ANSWER

    • Posted by Tejaswini Chhetri 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Saijal Singh 7 years, 2 months ago

    A.. human /B.. cockroach

    1Thank You

    ANSWER

    • Posted by Aashna Singh 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Saraj Bera 7 years, 2 months ago

    Atmospheric Fixation. The enormous energy of lightning breaks nitrogen molecules and enables their atoms to combine with oxygen in the air forming nitrogen oxides. These dissolve in rain, forming nitrates, that are carried to the earth.

    4Thank You

    ANSWER

    • Posted by Janufa Karona 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 7 answers

    Ritik Tevathiya 7 years, 2 months ago

    Avagadro no is used to find the atom present in 1mole and the value of 1 mole is 6.022x 10 ki power 23

    0Thank You

    Ankit Ambasta 7 years, 2 months ago

    Avagarado no.is used to find no. of particles .

    1Thank You

    Ankit Ambasta 7 years, 2 months ago

    6.022×10²³

    4Thank You

    Vedanshi Singh 7 years, 2 months ago

    6.022*10's power 23

    0Thank You

    Parampreet Kaur 7 years, 2 months ago

    6.022 X 10's power 23

    0Thank You

    Saijal Singh 7 years, 2 months ago

    Avogadro's number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.022140857 × 1023. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction

    0Thank You

    Nitin Jangra,?✌ 7 years, 2 months ago

    6.022× 1023

    0Thank You

    ANSWER

    • Posted by Mitesh Sikarwar 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Aman Anshuman 7 years, 2 months ago

    Sorry ! a little bit mistake occurred with me .

    0Thank You

    Kumkum Sarswat 7 years, 2 months ago

    Gravitational force is 1/6 th on moon not 1/4.

    0Thank You

    Aman Anshuman 5 years, 11 months ago

    No it's not 1/4 th at the surface of earth . It is at moon where the gravitational force is 1/4 th.

    4Thank You

    ANSWER

    • Posted by Manav Kuvekar 5 years, 11 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Kumkum Sarswat 7 years, 2 months ago

    u =0m/s Mass = m s=v2- u2/2a F = ma W = f x s W = ma x v2 - u2 /2a W = 1/2 m(v2 - u2) W = 1/2mv2. (u=0m/s )

    0Thank You

    Anil Kumar 7 years, 2 months ago

    2as=v2-u2. U=0 S=v2/2×a. 1 W=F×s F=ma W=ma×v2/2×a=W=1/2×mv2

    0Thank You

    Rahil Raza 7 years, 2 months ago

    2djjds

    6Thank You

    ANSWER

    • Posted by Manohar Kumar 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Ritik Tevathiya 7 years, 2 months ago

    When a stone is dropped it take time for going in water and kisten the sound so we divide it by 2 . 3.5/2= 1.25 Then speed = distance/time Distance= speed x time 1.25x 330=413.5

    0Thank You

    Ankit Ambasta 7 years, 2 months ago

    Let depth be X time =2X/v 2.5=2X/330 2.5×330/2=X 2.5×165=X 413.5m=X

    1Thank You

    Kumkum Sarswat 7 years, 2 months ago

    Question galat hai

    0Thank You

    ANSWER

    • Posted by Vivek Rawat 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Aman Anshuman 7 years, 2 months ago

    When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it .

    1Thank You

    ANSWER

    • Posted by Deepak Yadav 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Parampreet Kaur 7 years, 2 months ago

    Ozone layer is combination of ozone molecules. An ozone molecule is made up of 3 atoms of oxygen. (i. e. O3)

    0Thank You

    Aman Anshuman 7 years, 2 months ago

    And also due to lightning, the O2 split to form single atom . This O2 atom combine with remaining O2 & form Ozone ( O3 ) molecule .

    0Thank You

    Yogita Ingle 7 years, 2 months ago

    In atmosphere, some OXYGEN (O2) absorbed energy from ultraviolet (UV) ray and split to for single oxygen atoms. This oxygen combined with remaining oxygen and form ozone (O3) molecule.

    3Thank You

    ANSWER

    • Posted by Amisha Rankawat 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Nitin Jangra,?✌ 7 years, 2 months ago

    V=wavelength× frequency V=35m/s W=50cm=0.5m 35=0.5×f F=35÷0.5 F=70

    0Thank You

    Anil Kumar 7 years, 2 months ago

    12•25

    0Thank You

    ANSWER

    • Posted by Arya Magade 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Ankit Ambasta 7 years, 2 months ago

    [1]Echo -the phenomena of reflection of sound after striking a surface known as an echo. [2]Reverberation-The phenomena of reflection of sound making the sound to be heard several times known as reverberation.

    1Thank You

    Arjun Bhatty 7 years, 2 months ago

    Echo - reflection or bouncing of sound from a surface Reverberation - the repeated reflection of sound that makes the sound to be heard for a longer period of time

    1Thank You

    ANSWER

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