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    • Posted by Akul Gupta 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 4 years, 7 months ago

    Let the two bodies have masses m1 and m2 respectively such that m2 > m1 . Then, for first object p1 = m1v1 and for second object p2 = m2v2
    But p1 = p2 or m1v1 = m2v2
    Since m1 < m2, then v1 > v2
    Now, K = 1/2 mv^2 = 1/2 pv, therefore,
    K1/K2 = p1v1 / p2v2 = v1/v2
    But v1 > v2
    Therefore, kinetic energy of body of lesser mass is more.

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    • Posted by Abhishek Kumar 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Saur Deshmukh 4 years, 7 months ago

    When an object fully or partially immersed in a liquid it experiences a upward force which is equal to the the weight of liquid displaced

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    • Posted by Mamta Gupta Mamta Gupta 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Mamta Gupta Mamta Gupta 4 years, 7 months ago

    Atomosphere

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    • Posted by Nasab Malik 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Amir Rahmani 4 years, 7 months ago

    The ability of eye lens to adjust it,s focal length called the Power of accomodation..

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    Yogita Ingle 4 years, 7 months ago

    The ability of the human eye to adjust itself such that it can see objects which are nearby and faraway is called Accommodation.
    It primarily involves the lens and ciliary muscles.
    The ciliary muscles are capable of modifying the curvature of the lens and thereby affecting the focal length of the lens.
    When viewing objects which are nearby, the ciliary muscles contract, the lens becomes thicker. It is squeezed into a more convex shape and the focal length decreases (curvature increases). The images again falls on the retina. Note that here the eye is 'accommodating' by taking a thicker shape so that the image falls on the retina

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    • Posted by Khushal Sharma 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Efat Naaz 4 years, 7 months ago

    Nerve cell

    1Thank You

    Anuj Kumar Singh 4 years, 7 months ago

    Nurve cell in our body

    0Thank You

    Sanket Singh 4 years, 7 months ago

    Eveready and panasonic

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    • Posted by Savita Jha 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Nikita Roster 4 years, 7 months ago

    Wht

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    Prisha Gupta 4 years, 7 months ago

    In hindi it means jhatka

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    • Posted by Uday Shah 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Bishwadip Raj 4 years, 7 months ago

    No.It depends on mass of the body.

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    • Posted by Kashyap Ji Abhishek 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 4 years, 7 months ago

    INFECTIOUS DISEASES

    NON-INFECTIOUS DISEASES

    1. Caused due to attack of pathogens

    1. Caused by factors other than pathogens

    2. Caused due to extrinsic factors

    2. Caused due to intrinsic factors

    3. Transmitted from one person to another

    3. Do not get transmitted from one person to another

    4. Transmission of diseases occurs through direct contact or some medium (air, water, vectors)

    4. Transmission in case of hereditary diseases is from parent to offspring

    5. Community hygiene can reduce the occurrence of these diseases

    5. Community hygiene is ineffective in reducing the occurrence of these diseases

    E.g. Cholera, Malaria

    E.g. Diabetes, Goitre

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    • Posted by Ashish Kumar 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Narender Kumar 4 years, 7 months ago

    The Elements, sorted by Atomic Mass Atomic Number Symbol Name Atomic Weight (amu, g/mol) 1 H Hydrogen 1.00797 2 He Helium 4.00260 3 Li Lithium 6.941 4 Be Beryllium 9.01218 5 B Boron 10.81 6 C Carbon 12.011 7 N Nitrogen 14.0067 8 O Oxygen 15.9994 9 F Fluorine 18.998403 10 Ne Neon 20.179 11 Na Sodium 22.98977 12 Mg Magnesium 24.305 13 Al Aluminum 26.98154 14 Si Silicon 28.0855 15 P Phosphorus 30.97376 16 S Sulfur 32.06 17 Cl Chlorine 35.453 19 K Potassium 39.0983 18 Ar Argon 39.948 20 Ca Calcium 40.08 21 Sc Scandium 44.9559 22 Ti Titanium 47.90 23 V Vanadium 50.9415 24 Cr Chromium 51.996 25 Mn Manganese 54.9380 26 Fe Iron 55.847 28 Ni Nickel 58.70 27 Co Cobalt 58.9332 29 Cu Copper 63.546 30 Zn Zinc 65.38 31 Ga Gallium 69.72 32 Ge Germanium 72

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    • Posted by Naman Shahi 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Rupinder Singh 4 years, 7 months ago

    9.8ms^-2

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    • Posted by Ramdin Kumar 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 4 years, 3 months ago

    The drafting of the Constitution was done by an assembly of elected representatives called the Constituent Assembly. Elections to the Constituent Assembly were held in July 1946. Its first meeting was held in December 1946. The Constituent Assembly was formed in 1946. The idea of making the Constituent Assembly for framing the Constitution of India was devised by the Cabinet Mission Plan. The Constituent Assembly consisted of the elected representatives of varioius provinces who were eminent personalities in their own fields. The members to the Constituent Assembly were elected by Provincial legislative councils. They elected people from the whole country to represent every area.It was elected on December and first meeting in 1946.It cmae to force on 26th January 1950.

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    • Posted by Chanchala Kumari 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Shreepriya Sahoo 4 years, 7 months ago

    A body at rest or in uniform motion will remains at rest or on uniform motin until an external unbalanced force is applied

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    Gaurav Singh 4 years, 7 months ago

    An object continues to be in a state of rest or of uniform motion along a straight line unless acyed upon by an unbalanced force.

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    • Posted by Shubham Pandey 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Anuj Kumar Singh 4 years, 7 months ago

    Because of sound wave is mechanical wave

    0Thank You

    Chetan Bakshi 4 years, 7 months ago

    Every thing require medium

    0Thank You

    Bishwadip Raj 4 years, 7 months ago

    Because sound is a meachanical wave

    1Thank You

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    • Posted by Sharath Prakash 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Tanmaya Chita Padhi 4 years, 7 months ago

    Because they have the force of attraction

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    • Posted by Jaydev Swain 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 4 years, 7 months ago

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    • Posted by Anirudh Jandev 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Varun Sharma 4 years, 7 months ago

    Bohr's divide atom in 3 types -electron, proton, neutron 1. Electron and proton revolves around the nucleus in the fixed proportion.

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    • Posted by Durgesh Chatterjee 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Jaskaran Saroya 4 years, 7 months ago

    Fire is made up of many different substances, so it is not an element. For the most part, fire is a mixture of hot gases. ... If the flame is hot enough, the gases are ionized and become yet another state of matter: plasma. Burning a metal, such as magnesium, can ionize the atoms and form plasma

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    • Posted by Rashmi Rani 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 4 years, 7 months ago

    The weight of an object on the moon will be about one-sixth of what is on the earth. Thus, a spring balance which shows the weight of a body to be 6 N on earth will show a weight of only 1 N when taken to the moon. The weight of an object on the moon is less than that on the earth because the mass and radius of the moon are less than that of earth.

    Suppose we have an object of mass m. let its weight on the moon be Wm, the mass of the moon is Mm and its radius is Rm. now, according to the universal law of gravitation, the weight of the object on the moon will be:

    Wm = G x Mm x m/Rm2

    Let the weight of the same object on the earth be We. The mass of the earth is M and its radius is R.

    We = G x M x m/R2

    Wm = G x 7.36 x 1022 kg x m / (1.74 x 106 m)2

    Wm = 2.431 x 1010 G x m                                                                                               i.

    We = 1.474 x 1011 G x m                                                                                                ii.

    Dividing both the equations i. & ii.

    Wm/We = 1/6

    Weight of the object on the moon / Weight of the object on the earth = 1/6

    Weight of the object on the moon = (1/6) × its weight on the earth.

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    • Posted by Kiran Yadav 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Jaskaran Saroya 4 years, 7 months ago

    Distance- 1. actual length covered by an object. 2. It is a vector quantity.3. It cannot be zero.4. It has only magnitude. Displacement- 1. It is the shortest distance covered by an object. 2. It is scaler quantity. 3. It can be zero.4. It has a magnitude as well as direction.

    1Thank You

    Yash Kumar 4 years, 7 months ago

    Distance. It is the actual length of the path covered by a body. It is a scalar quantity i.e. it has only magnitude. It cannot be zero. Displacement. It is the shortest straight line between the initial and final position of the body. It is a vector quantity i.e. it has magnitude as well as direction. It can be zero

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    • Posted by Arnav Aryan 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Meghna Thapar 4 years, 7 months ago

    The vegetable oils (like groundnut oil, cotton seed oil and mustard oil) are unsaturated compounds containing double bonds. They are in the liquid state at room temperature. Due to the presence of double bonds, vegetable oils undergo addition of hydrogen just like alkenes to form saturated products called vegetable ghee or vanaspati ghee which are solid (or semi-solid) at the room temperature.

    An example of the hydrogenation of oils is given below:  Vegetable oils are unsaturated fats having double bonds between some of their carbon atoms. When a vegetable oil (like groundnut oil) is heated with hydrogen in the presence of finely divided nickel as catalyst, then a saturated fat called vegetable ghee (or vanaspati ghee) is formed.

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    • Posted by Anjali Dhankar 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Sunil Dhankar 4 years, 7 months ago

    Atomic mass of He =4u Molar mass of He = 4g The number of moles = given mass / molar mass n=m/M= 12/4 = 3 moles _

    1Thank You

    Nisha Setia 4 years, 7 months ago

    No. of moles = given mass ----------------------- Gram atomic mass Given mass of oxygen is 64 g. And atomic mass of oxygen is 16u. So, gram atomic mass of oxygen is 16g. No. of moles = 64 -------. = 4 moles. 16 Given mass of helium is 12 g. And atomic mass of helium is 2u. So, gram atomic mass of helium is 12g. No. of moles = 12 -------. = 6 moles. 2

    2Thank You

    ꧁༒ Shaurya༻ 4 years, 7 months ago

    Then , Moles of helium= 12/4(4is the molecular mass of helium) Moles of helium = 3u

    1Thank You

    ꧁༒ Shaurya༻ 4 years, 7 months ago

    no of moles= given mass/ molecular mass Moles of oxygen= 64/ 16 =4u ( u=moles)

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    • Posted by Vipasha Khatri 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Jaskaran Saroya 4 years, 7 months ago

    In here we put, 2as=v2-u2 So, 2×-0.4×s=(0)2-(20)2 (because it stops at last so final velicity will be zero and initial velocity is 72km/h is changes into 20m/s) -0.8×s=-400 S=-400/0.8 S=400×10/8 S=50×10 S=500m

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    • Posted by Piyush Mourya 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Nisha Setia 4 years, 7 months ago

    Metal - 1) They are good conductors of heat and electricity. 2) Metals are ductile. 3) Metals are Malleable. 4) Metals are generally hard. 5) Metals are Lustrous(Shiny). Non- Metal - 1) They are bad conductors of heat and eletricity. 2) Non- Metals are not ductile. 3) Non- Metals are not Malleable. 4) Non- Metals are generally soft. 5) Non- Metals are not lustrous(Not Shiny). They are dull in appearance.

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    • Posted by Deepak Prajapati 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Fathima Kabeer 4 years, 7 months ago

    Frst u classify into vertebrata and non vrtbrta. Then learn

    0Thank You

    Rudra Parmar 4 years, 7 months ago

    If u want direct notes ask me

    0Thank You

    Rudra Parmar 4 years, 7 months ago

    Make their notes

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    • Posted by Arati Mohapatra 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Kanak Singh 4 years, 7 months ago

    Elastic potential energy

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    • Posted by Goutham Girik 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Vipasha Khatri 4 years, 7 months ago

    It will be called a sol. And the example is milk of magnesia and mud.

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    • Posted by Sahil Kumar 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 5 answers

    Yash Kumar 4 years, 7 months ago

    Electronic configuration :- 2,1 Element :- Lithium Valency :- 1

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    Rudra Parmar 4 years, 7 months ago

    Valency 1 Element lithium

    0Thank You

    Pramod Kumar Singh 4 years, 7 months ago

    Lithium

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    Rupesh Chauhan 4 years, 7 months ago

    Lithium

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    Babita Shukla 4 years, 7 months ago

    Valency- 1 Electronic confurigation - 2 , 1 Name- Lithium

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    • Posted by Vimal Kumar 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Shelly Verma 4 years, 7 months ago

    The process of inoculating , or injecting a vaccine into a person to develop immunity against a particular disease is called immunisation

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    • Posted by Geeta Ss 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Shelly Verma 4 years, 7 months ago

    solid properties like rigidity, definate shape , fixed volume and incompresibility so wooden. so , wooden should be solid because it possesses all above properties of solid . And the particles of solid if very closely packed and the force of attraction is much high in solid and they have a highest possess density

    1Thank You

    Shreepriya Sahoo 4 years, 7 months ago

    Wood is solid because :- (A) it is rigid (B)it has definite shape

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    • Posted by Geeta Ss 4 years, 7 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Shelly Verma 4 years, 7 months ago

    Because molecules of gas possess high kinetic energy and very weak intermolecular force of attraction . So the molecules of gases move in all directions . So ,this means the vessal completely filled with gas

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    Shreepriya Sahoo 4 years, 7 months ago

    Because there is no force of attraction between gas particles.So they are free to move & occupy all the space available to them

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