Please select a subject first
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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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The water conducting tissue generally present in gymnosperm is
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______ are forms of complex tissue.
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Xylem transports ______ and ______ from soil.
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Why are xylem and phloem called complex tissues? How are they different from one other?
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Organisms without nucleus and cell organelles belong to
- fungi
- protista
- cyano bacteria
- archae bacteria
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Fungi shows ______ mode of nutrition.
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Cell wall of fungi is made up of ______.
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