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What is heat ? Write its S.I. unit.
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Two bodies at different temperatures are placed in contact. State the direction in which the heat will flow.
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Name the S.I. unit of heat and how is it related to the unit calorie?
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Define temperature and write its S.I. unit.
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Why does a piece of ice when touched with a hand, appear cool? Explain.
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Distinguish between heat and temperature.
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Name two substances which expand on heating.
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Name two substances which contract on heating.
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State the volume changes that you will observe when a given mass of water is heated from 0°C to 10°C. Sketch a temperature-volume graph to show the behaviour.
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A given mass of water is cooled from 10°C to 0°C. State the volume changes you will observe. Represent these changes on a temperature-volume graph.
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A deep pond of water has its top layer frozen during winter. State the expected temperature of water layer (i) Just in contact with ice and (ii) At the bottom of pond.
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Draw a diagram showing the temperature of various layers of water in an ice covered pond.
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Explain the following
Water pipes in colder countries often burst in winter.
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Explain the following
In winter, water tanks (or ocean) start freezing from the surface and not from the bottom.
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S.I. unit of temperature is :
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Describe in brief, with the aid of a lebelled diagram, an experiment to demonstrate that a material medium is necessary for propagation of sound.
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State three characteristics of the medium required for propagation of sound?
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State two properties of medium on which the speed of sound in it depends.
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