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The increase in length of a metal rod depends on
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What is matter? What is it composed of?
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Two bodies of same masses are placed at heights h and 2h. Compare their gravitational potential energy.
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Find the gravitational potential energy of 2.5 kg mass kept at a height of 15 m above the ground. The force of gravity on mass 1 kg is 10 n.
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The gravitational potential energy stored in a box of weight 150 kgf is 1.5 × 104 J. Find the height of the box. Take 1 kgf = 10 N.
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What do you understand by thermal expansion of a substance?
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State three factors on which depend the linear expansion of a metal rod on heating.
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Two iron rods – one 10 m long and the other 5 m long, are heated to the same rise in temperature. Which will expand more?
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Two identical rods of copper are heated to different temperatures — one by 5°C and the other by 10°C. Which rod will expand more?
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One rod of copper and another identical rod of iron are heated to the same rise in temperature. Which rod will expand more? Give reason.
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In the ball and ring experiment, if the ball after heating is left to cool on the ring for sometime, the ball again passes through the ring. Explain the reason.
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Iron rims are heated before they are fixed on the wooden wheels.
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Why is one end of a steel girder in a bridge kept on rollers instead of fixing it in pillar?
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A metal plate is heated. State three factors on which the increase in its area will depend.
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A cubical metal solid block is heated. How will its volume change?
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State one application of thermal expansion of liquids.
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Describe an experiment to showthat air expands on heating.
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An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into water. Explain the reason.
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Describe an experiment to show that same volume of different liquids heated to same rise in temperature expand by different amounts.
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100 ml of each of the following liquid is heated from 10°C to 50°C. Which will expand more : (a) water (b) benzene (c) alcohol?
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