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    • Posted by Aditya Chauhan 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Drishi Jain 7 years, 2 months ago

    The sonar stands for Sound Navigation and Ranging . Sonar is use to determine the depth of the sea and to locate under water hills ,valleys , submarines, icebergs ,sunken ships etc.

    3Thank You

    ANSWER

    • Posted by Vish K 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Taha Mateen 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Cheshta Bhati 7 years, 2 months ago

    Rutherford did an experiment. In this experiment fast moving alpha(doubly charged helium ions) particles were made to fall on gold foil. OSREVATIONS OF MODEL. 1.There is a positively charged centre in an atom called nucleus. Nearly all the mass of the atom resides in its nucleus. 2.The electrons revolve around the nucleus in circular paths. 3.The size of the nucleus is comparatively very small to that the size of atom.

    2Thank You

    Tashwani Mishra 7 years, 2 months ago

    Rutherford model is also called nuclear model of an atom . he gave us a nucleus of an atom. He told that the size of nucleus is very small as compared to atom. The electrons revolved around nucleus. This explain their model by an experiment pf gold foil

    1Thank You

    Akanksha Kumari? 7 years, 2 months ago

    Earnest Rutherford gave the atomic model which described the presence of nucleus . He made the fast moving alpha particles pass from the gold foil and following observations were noticed: 1. Most of the alpha particles passed straight through the foil concluding that most of the space inside the atom is empty. 2. Few particles were deflected at smaller angles concluding that the positive space in an atom occupies very little space. 3. Few particles were completely bounced back concluding that the mass of the atom is concentrated in a small volume within the nucleus.

    2Thank You

    ANSWER

    • Posted by Anshaj Pandey 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Anshaj Pandey 7 years, 2 months ago

    Due to the dark matter

    0Thank You

    Palak ?? 7 years, 2 months ago

    As per my thinking...our milky way galaxy remain suspended in space due to strong gravitational force of other big galaxies around us....

    1Thank You

    ANSWER

    • Posted by Saurav Rathore 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Akshita Yadav 7 years, 2 months ago

    A vaccine is a type of medicine that trains the body's immune system so that it can fight a disease it has not come into contact with before . Vaccines are designed to prevent diseases ,rather than treat a disease once you have caught it . To understand how vaccine work it helps to look first at how the immune system works , because vaccine harness the natural activity of your immune system. These molecules are called antigens , and they are present on all viruses and bacteria . By injecting these antigens into the body, the immune system can safely learn to recognise them as hostile invaders , produce antibodies and remember them for the future . If the bacteria or virus reappears , the immune system will recognise the antigens immediately and attack aggresively well before the pathogens can spread and cause sickness.

    2Thank You

    Palak ?? 5 years, 11 months ago

    And u Krishti..if u don't know the correct answer,then don't write anything stupid ...it creates a lots of confusion in minds of those who don't know the correct answer,if u want to answer a question,then first be confirmed of ur answer or else there is no need to answer...???

    5Thank You

    Palak ?? 7 years, 2 months ago

    Vaccines r dead or weakend suspensions of micro organisms for a particular disease. I am going to explain you with an example of Vaccine of dengue.when Microorganisms are active they cause dengue in our body, but when they are weak or dead, they are harmless. So when these dead pathogen are injected in our body in the form of vaccines, they do not cause any harm to our body but when are immune system recognise is it it starts building antibodies against it and eliminate those suspensions of microorganisms. So in this way our body is not affected by dengue and we have antibodies build against dengue. Thus there is no dangerous of getting affected by dengue .Hope that will help

    3Thank You

    Krishti Sen 5 years, 11 months ago

    Vaccines are given to a person to keep away their body from disease causing microorganisms. When they are injected to our body,they get the way to spead all over the body and kill the microbes before they effext us

    0Thank You

    ANSWER

    • Posted by Jaymin Thakar 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Palak ?? 7 years, 2 months ago

    18km/h=5m/s......36km/h=10m/s....remember to convert things into their SI unit...not like what rubbish Krishti Sen has done...now,we know work done = increase in kinetic energy=1/2×m×v×v-1/2×m×u×u=100000-2500=97500joules answer

    2Thank You

    Krishti Sen 7 years, 2 months ago

    18km/h÷36km/h=2km/h 2000kg×2km/h=4000kg÷1000=4kg

    0Thank You

    ANSWER

    • Posted by Karanpreet Singh 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Krishti Sen 7 years, 2 months ago

    Speed of wave=frequency ×wavelength v=1000×0.5=500m/s speed=distance/time 500=500/t=1second

    1Thank You

    Akanksha Kumari? 7 years, 2 months ago

    Frequency = 1000 Hz wavelength = 50 cm = 0.5 m distance = 500m Now speed of wave = frequency × wavelength V= 1000 × 0.5 = 500 m/s Speed = distance/ time 500 = 500 / t Thus t= 1 sec

    1Thank You

    ANSWER

    • Posted by Sachin Thakur 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 6 answers

    Akshita Yadav 7 years, 2 months ago

    krishti you have again show your foolishness over here atoms are not the smallest particles it is proton electron and neutron which is the smallest particle but now scientists are searching for more smallest particles they say that even electron proton and neutron are made of even smaller particles

    0Thank You

    Aditya Chauhan 7 years, 2 months ago

    As we know that the smallest particles of the world is ATOM its size was 0.00001 nm so' we can't see it by microscope.

    1Thank You

    Palak ?? 7 years, 2 months ago

    Atoms are not the smallest particles....three are more particles smaller than them..they r not visible even with the most powerful microscope because they have a very small size that is approximately 0. 0 0 0 0 0 0 0 1 m

    0Thank You

    Krishti Sen 7 years, 2 months ago

    It is because atoms are the most smallest particles

    0Thank You

    Anshu Gahlawat 7 years, 2 months ago

    It is not possible to see an atom even under a powerful miccroscope becaise it's size is 10^-9 m which much beyond the range of a pwerful microscope

    1Thank You

    Rk Teotia 7 years, 2 months ago

    Because atom is the smmalest partical

    1Thank You

    ANSWER

    • Posted by Shrishti Singh 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 4 answers

    Akshita Yadav 7 years, 2 months ago

    again krishti what is 3585etc over here sangeev have not even told the element whose atomic number he wants to know are you rubbish dumb we think so

    1Thank You

    Rithika Venkatesan 7 years, 2 months ago

    Can u tell the element first

    1Thank You

    Palak ?? 7 years, 2 months ago

    Tell the name of element whose atomic no. U want to know.....

    2Thank You

    Krishti Sen 5 years, 11 months ago

    35,85etc

    0Thank You

    ANSWER

    • Posted by Md Adil 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 6 answers

    Akshita Yadav 7 years, 2 months ago

    palak you are wrong over here it is nucleus

    0Thank You

    Rithika Venkatesan 7 years, 2 months ago

    Nucleus is the cell organell and palak sinha if u dont know dont confuse others

    1Thank You

    Palak ?? 7 years, 2 months ago

    Hey guys u all are wrong.....nucleus is not a cell organelle...most of the cell activities are controlled by mitochondria...as it gives energy for all the activities...that a why it is also known as power house of the cell.....

    2Thank You

    Krishti Sen 7 years, 2 months ago

    Nucleus

    1Thank You

    Rampati Mahto 7 years, 2 months ago

    I think the nucleus is the organelle that control most of the activities .Nucleus contain the genetic material called DNA that is responsible for controlling and directing all cell activities this is a very important organelles give its vital function.

    3Thank You

    Anjali Rawat 7 years, 2 months ago

    Nucleus

    2Thank You

    ANSWER

    • Posted by Rajveer Chib 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Mehtab Shah 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Krishti Sen 7 years, 2 months ago

    When any diseases effect the human body and gets effected due to these body gets infected nd we fall ill

    0Thank You

    Rasik Bhalla 7 years, 2 months ago

    When a disease causing microorganism enters our body it causes disease or infection. So we fall ill.

    2Thank You

    ANSWER

    • Posted by Nandini Upadhyay 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Rasik Bhalla 7 years, 2 months ago

    Convection currents transfer heat from one place to another by mass fluid such as water.

    2Thank You

    ANSWER

    • Posted by Sarthak Kumar 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Aarya Gupta 7 years, 2 months ago

    The resoures which are the main source food is called food resoures.

    0Thank You

    ANSWER

    • Posted by Rasik Bhalla 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Aarya Gupta 7 years, 2 months ago

    The massof all the elements of a molecule or chemical formula is called molecular mass.

    0Thank You

    ANSWER

    • Posted by Anant Rai 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 4 answers

    ?D? ??Wish Me At 12Pm...?? 7 years, 2 months ago

    The mass of an atom is contain in nucleus.

    0Thank You

    Rajveer Chib 7 years, 2 months ago

    Nuclus

    1Thank You

    Aarya Gupta 7 years, 2 months ago

    Nucleus

    0Thank You

    Rasik Bhalla 7 years, 2 months ago

    Nucleus of a atom contains the mass of atom. All the weight of a atom is because of nucleus only.

    1Thank You

    ANSWER

    • Posted by Ravindra Patil 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 3 answers

    Rk Teotia 7 years, 2 months ago

    The convert liquid into vapors on heating ? is called evaporation

    1Thank You

    Shivam Yadav 7 years, 2 months ago

    The changing of liquid into gas or vapour below its boiling point is called evaporation

    2Thank You

    Aditya Sharma 7 years, 2 months ago

    Jab paani bhaap ban jaata hai

    1Thank You

    ANSWER

    • Posted by Rahul Kumar 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Shivam Yadav 7 years, 2 months ago

    Isotopes are atoms of the same element havng the same atomic number but different mass number

    0Thank You

    ANSWER

    • Posted by Yash Kapoor 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Aditya Sharma 7 years, 2 months ago

    Ghadi ke golle ka idar udhar ghumna

    0Thank You

    Bhargav G 7 years, 2 months ago

    movement back and forth in a regular rhythm.

    2Thank You

    ANSWER

    • Posted by Anirudh Ajithkumar 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Bhargav G 7 years, 2 months ago

    It helps human to get to know about natural disaster

    0Thank You

    ANSWER

    • Posted by Bhawna Gupta 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Prisha Patel 7 years, 2 months ago

    The difference between homogeneous and heterogeneous : Homogeneous mixture, is a mixture in which the particles are uniformly distributed throughout without any clear boundary. Heterogeneous mixture, is a mixture which does not have uniform composition and have visible boundary of separation

    1Thank You

    ANSWER

    • Posted by Bhawna Gupta 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Aditya Sharma 7 years, 2 months ago

    Ye vo point hai jab paani oobalne lgta hai

    0Thank You

    Aaryan Nisarta 7 years, 2 months ago

    When at a certain temperature fulids start boiling is called boiling point

    3Thank You

    ANSWER

    • Posted by Vivek Mishra 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Bhawna Gupta 7 years, 2 months ago

    0.4 Kg/m^3

    0Thank You

    ANSWER

    • Posted by Divyansh Singh 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Divyansh Singh 7 years, 2 months ago

    It controls all the glands and pituitary gland is the master gland it produces growth harmone

    1Thank You

    ANSWER

    • Posted by Rampati Mahto 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 0 answers
    ANSWER

    • Posted by Rampati Mahto 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Rasik Bhalla 7 years, 2 months ago

    Epithelial tissues - Form the covering of the external surfaces, internal cavities, and organs of the animal body. Connective tissues - Specialized to connect various body organs. For example, Blood

    2Thank You

    ANSWER

    • Posted by Poonam Chawdi 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Khushi Boora 7 years, 2 months ago

    F=1/Time or F=Velocity/ wavelength. (F= frequency

    2Thank You

    ANSWER

    • Posted by Ramsharan Kishor 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 2 answers

    Roshmitha Reddy 7 years, 2 months ago

    Protons ,neutrons and eletrons

    1Thank You

    Sarita Rao 7 years, 2 months ago

    Atoms are made up of subatomic particles electron,proton and neutron

    4Thank You

    ANSWER

    • Posted by Lokhi Gogoi 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Shivam Yadav 7 years, 2 months ago

    Sound is propogated when the sound waves are produced due to vibration of object. Sound can be propogated in any material like it can be a solid, liquid, or gas. You can see the experiment given in our s chand physics on page no-180 and 181

    0Thank You

    ANSWER

    • Posted by Pratham Matta 7 years, 2 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Ram Kushwah 7 years, 2 months ago

    Here u=0 h=20m,g=10m/s2

    v2=u2+2gh

    =0+2x10x20=400

    so v=20 m/sec

    also

    v=u+gt

    20=0+10t

    t=2 sec

    0Thank You

    ANSWER

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