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9th Class Physics chapter 8 Long Questions
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Online Long Questions For Chapter 8 "9th Class Physics Chapter 8 Long Question Preparation "
Try The Long Questions For 9th Class Physics Chapter 8 Long Question Preparation
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Total Questions10
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Available Sets2
Physics (New Book) - 9th Class Physics Chapter 8 Long Question Preparation
Question # 1
Explain the consequences and application of thermal expansion.
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Ans 1: Consequences of thermal expansions: the expansion of solids may damage the bridge, railway tracks and roads as they are constantly subjected to temperature changes. So provision is made during construction for expansion and contraction with temperature. For example, railway tracks bucked on a hot summer day due to expansion if gaps are not left between sections.Bridge made of steel girders also expands during the day and contract during night. They will bend if their ends are fixed. to allow thermal expansions, one end is fixed while the other end of the girder rests on rollers in the gap left for expansion. Overhead transmission lines are also given a certain amount of sag so that they can contract in winter without snapping.
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Ans 2: Application of thermal expansion: thermal expansion is used in our daily life. In thermometers, thermal expansion is used in temperature measurements. To open the cap of a bottle that is tight enough, immerse it in hot water for a minute or so. Metal cap expands and becomes loose. It would now be easy to turn it to open.To join steel plates tightly together, red hot rivets are forced through holes in the plates. The end of hot rivet is then hammered. On cooling, the rivets contract and bring the plates tightly gripped. Iron rims are fixed on wooden wheels of carts. Iron rims are heated. Thermal expansion allows them to slip over wooden wheel. Water is poured on it to cool. The rim contracts and become tight over the wheel.
9th Class Physics Chapter 8 Long Question Preparation - Set 1
Question # 1
Explain the consequences and application of thermal expansion.
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Ans 1: Consequences of thermal expansions: the expansion of solids may damage the bridge, railway tracks and roads as they are constantly subjected to temperature changes. So provision is made during construction for expansion and contraction with temperature. For example, railway tracks bucked on a hot summer day due to expansion if gaps are not left between sections.Bridge made of steel girders also expands during the day and contract during night. They will bend if their ends are fixed. to allow thermal expansions, one end is fixed while the other end of the girder rests on rollers in the gap left for expansion. Overhead transmission lines are also given a certain amount of sag so that they can contract in winter without snapping.
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Ans 2: Application of thermal expansion: thermal expansion is used in our daily life. In thermometers, thermal expansion is used in temperature measurements. To open the cap of a bottle that is tight enough, immerse it in hot water for a minute or so. Metal cap expands and becomes loose. It would now be easy to turn it to open.To join steel plates tightly together, red hot rivets are forced through holes in the plates. The end of hot rivet is then hammered. On cooling, the rivets contract and bring the plates tightly gripped. Iron rims are fixed on wooden wheels of carts. Iron rims are heated. Thermal expansion allows them to slip over wooden wheel. Water is poured on it to cool. The rim contracts and become tight over the wheel.
9th Class Physics Chapter 8 Long Question Preparation - Set 2
Question # 1
Explain the consequences and also application of thermal expansion.
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Ans 1: Consequences of thermal expansions: the expansion of solids may damage the bridge, railway tracks and roads as they are constantly subjected to temperature changes. So provision is made during construction for expansion and contraction with temperature. For example, railway tracks bucked on a hot summer day due to expansion if gaps are not left between sections.Bridge made of steel girders also expands during the day and contract during night. They will bend if their ends are fixed. to allow thermal expansions, one end is fixed while the other end of the girder rests on rollers in the gap left for expansion. Overhead transmission lines are also given a certain amount of sag so that they can contract in winter without snapping.
-
Ans 2: Application of thermal expansion: thermal expansion is used in our daily life. In thermometers, thermal expansion is used in temperature measurements. To open the cap of a bottle that is tight enough, immerse it in hot water for a minute or so. Metal cap expands and becomes loose. It would now be easy to turn it to open.To join steel plates tightly together, red hot rivets are forced through holes in the plates. The end of hot rivet is then hammered. On cooling, the rivets contract and bring the plates tightly gripped. Iron rims are fixed on wooden wheels of carts. Iron rims are heated. Thermal expansion allows them to slip over wooden wheel. Water is poured on it to cool. The rim contracts and become tight over the wheel.
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