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Explain why a ship loaded with light goods is more liable to be overturned than the one loaded with heavy goods.
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Explain why Standing passengers are not allowed on the upper deck of a double-decker bus.
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Explain the term ‘centre of gravity’ of a body.
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State two methods of increasing the stability of the body.
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A boy of mass 40 kg runs up a height of 30 steps, each 20 cm high. Find:
(i) The force of gravity acting on the boy.
(ii) The work done by the boy against gravity. (Take g = 9.8 ms−2)
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What is meant by earthing of an electrical appliance? Why is it essential?
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In a three-pin plug top, one of the pins is thicker and longer than the other two, Give reason. Name this pin.
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A mixture of radioactive substances gives off three types of radiation name the radiation which has the highest ionizing power.
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A mixture of radioactive substance gives off three types of radiation name the radiation which has the highest ionizing power.
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A mixture of radioactive substance gives off three types of radiation name the radiation which when becomes neutral, become the atom of rare gas.
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What is prism?
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The nuclear radiation which gets deflected towards the negatively charged plate in an electric field is ______.
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Name a single pulley in which displacement of load and effort is not the same.
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When this triangular lamina is suspended freely from any one vertex, what is the moment of force produced by its own weight in its rest position?
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| Meera chose to use a block and tackle system of '9' pulleys instead of a single movable pulley to lift a heavy load. |
What is the advantage of using a block and tackle system over a single movable pulley?
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A hollow ice cream cone has height 6 cm.
- Where is the position of its center of gravity from the broad base?
- Will its position change when it is filled completely with honey? Write Yes or No.
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How does the angle of minimum deviation produced by a prism change with increase in
- the wavelength of incident light, and
- the refracting angle of prism?
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A lens forms an upright and magnified image of an object. Draw a labelled ray diagram to show the image formation.
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Why should a connection wire be thick?
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A radioactive source emits three type of radiations. Give the charge and mass of particles composing the alpha radiations.
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