Please select a subject first
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Explain rain water harvesting.
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Name the scientist who discovered electron.
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Which subatomic particle was discovered by : Thomson?
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Name the principle on which a soundboard works.
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What is the shape of a soundboard kept behind the speaker on the stage of a big hall ?
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Name two sound absorbing materials (or objects) which can make our big room less echoey.
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(a) Describe Thomson's model of the atom. Which subatomic particle was not present in Thomson's model of the atom?
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What is a megaphone ? Name the principle on which a megaphone works.
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What is a bulb horn ? Name the principle on which a bulb horn works.
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What is a stethoscope ? Name the principle on which a stethoscope works.
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What is a soundboard ? Explain the working of a soundboard with the help of a labelled diagram.
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Draw a labelled diagram to show the multiple reflections of sound in a part of the stethoscope tube.
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The first model of an atom was given by :
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How many atoms are present in one gram atomic mass of a substance ?
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Define gram atomic mass of a substance. How much is the gram atomic mass of oxygen ?
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Define atomic mass of an element.
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What is meant by saying that 'the atomic mass of oxygen is 16' ?
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One electron is present in the outermost shell of the atom of an element X. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell?
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