The correct answer is option C. In summer, the heat causes rubber to harden, reducing its flexibility. When air inside the bicycle tube heats up, it expands. However, the hardened rubber cannot expand adequately to accommodate the increased pressure. This results in heightened stress on the tube, maRead more
The correct answer is option C. In summer, the heat causes rubber to harden, reducing its flexibility. When air inside the bicycle tube heats up, it expands. However, the hardened rubber cannot expand adequately to accommodate the increased pressure. This results in heightened stress on the tube, making it more prone to bursting, specifically due to the rigidity caused by heat. Therefore, option C best explains why bicycle tubes burst mostly in summer. Options A and B are incorrect, as the tube doesn’t burst directly due to heat or because rubber becomes weak.
The correct answer is option D. When water is cooled from 10°C to 0°C, its density decreases until it reaches 4°C, where it is at its minimum. Below 4°C, water begins to expand as it approaches the freezing point, causing its density to increase again. This is due to the unique behavior of water, whRead more
The correct answer is option D. When water is cooled from 10°C to 0°C, its density decreases until it reaches 4°C, where it is at its minimum. Below 4°C, water begins to expand as it approaches the freezing point, causing its density to increase again. This is due to the unique behavior of water, where its density decreases as it cools until it reaches 4°C, after which it starts to increase due to the formation of ice crystals. Therefore, option D accurately describes the changes in density as water is cooled from 10°C to 0°C. Options A, B, and C are incorrect because they do not accurately represent the behavior of water’s density over this temperature range.
The correct answer is option A. When hot water is sprinkled on a thick glass, the sudden temperature change causes the glass to expand rapidly. Glass is a poor conductor of heat, so uneven heating can occur, leading to uneven expansion. This uneven expansion creates stress within the glass, which caRead more
The correct answer is option A. When hot water is sprinkled on a thick glass, the sudden temperature change causes the glass to expand rapidly. Glass is a poor conductor of heat, so uneven heating can occur, leading to uneven expansion. This uneven expansion creates stress within the glass, which can exceed its tensile strength, ultimately causing it to fracture. Therefore, the sudden expansion of the glass due to the hot water is the primary reason for its breakage in this scenario. Options B, C, and D are incorrect because the breakage is primarily caused by thermal expansion rather than compression, water evaporation, or chemical reaction with the glass.
The correct answer is option A. Metal tea pots have wooden handles because wood is a poor conductor of heat compared to metal. This property prevents the handle from becoming too hot to touch, allowing users to safely pour hot tea without burning their hands. Option B is incorrect because the primarRead more
The correct answer is option A. Metal tea pots have wooden handles because wood is a poor conductor of heat compared to metal. This property prevents the handle from becoming too hot to touch, allowing users to safely pour hot tea without burning their hands. Option B is incorrect because the primary reason for wooden handles is heat insulation rather than electric shock prevention. Option C is irrelevant to the functional purpose of the handle. Option D is also irrelevant as cleanliness is not directly related to the choice of material for the handle. Therefore, option A best explains why metal tea pots often have wooden handles, as they provide thermal insulation and ensure user safety during handling.
The correct answer is option C. Water is used in hot water bags because of its high specific heat capacity. This means it can absorb and retain a large amount of heat, making it effective for providing warmth when used in hot water bags. Options A, B, and D are not the primary reasons for choosing wRead more
The correct answer is option C. Water is used in hot water bags because of its high specific heat capacity. This means it can absorb and retain a large amount of heat, making it effective for providing warmth when used in hot water bags. Options A, B, and D are not the primary reasons for choosing water; rather, it’s the specific heat capacity that makes it suitable for this purpose. Water’s availability, affordability, and ease of heating may be secondary factors, but the main reason is its high specific heat, allowing it to store and release heat effectively for therapeutic use in hot water bags. Therefore, option C best explains why water is commonly used in hot water bags.
Why do bicycle tubes burst mostly in summer?
The correct answer is option C. In summer, the heat causes rubber to harden, reducing its flexibility. When air inside the bicycle tube heats up, it expands. However, the hardened rubber cannot expand adequately to accommodate the increased pressure. This results in heightened stress on the tube, maRead more
The correct answer is option C. In summer, the heat causes rubber to harden, reducing its flexibility. When air inside the bicycle tube heats up, it expands. However, the hardened rubber cannot expand adequately to accommodate the increased pressure. This results in heightened stress on the tube, making it more prone to bursting, specifically due to the rigidity caused by heat. Therefore, option C best explains why bicycle tubes burst mostly in summer. Options A and B are incorrect, as the tube doesn’t burst directly due to heat or because rubber becomes weak.
See lessIf water is cooled from 10 °C to 0 °C, then
The correct answer is option D. When water is cooled from 10°C to 0°C, its density decreases until it reaches 4°C, where it is at its minimum. Below 4°C, water begins to expand as it approaches the freezing point, causing its density to increase again. This is due to the unique behavior of water, whRead more
The correct answer is option D. When water is cooled from 10°C to 0°C, its density decreases until it reaches 4°C, where it is at its minimum. Below 4°C, water begins to expand as it approaches the freezing point, causing its density to increase again. This is due to the unique behavior of water, where its density decreases as it cools until it reaches 4°C, after which it starts to increase due to the formation of ice crystals. Therefore, option D accurately describes the changes in density as water is cooled from 10°C to 0°C. Options A, B, and C are incorrect because they do not accurately represent the behavior of water’s density over this temperature range.
See lessWhen hot water is sprinkled on a thick glass, it breaks. What is the reason for this?
The correct answer is option A. When hot water is sprinkled on a thick glass, the sudden temperature change causes the glass to expand rapidly. Glass is a poor conductor of heat, so uneven heating can occur, leading to uneven expansion. This uneven expansion creates stress within the glass, which caRead more
The correct answer is option A. When hot water is sprinkled on a thick glass, the sudden temperature change causes the glass to expand rapidly. Glass is a poor conductor of heat, so uneven heating can occur, leading to uneven expansion. This uneven expansion creates stress within the glass, which can exceed its tensile strength, ultimately causing it to fracture. Therefore, the sudden expansion of the glass due to the hot water is the primary reason for its breakage in this scenario. Options B, C, and D are incorrect because the breakage is primarily caused by thermal expansion rather than compression, water evaporation, or chemical reaction with the glass.
See lessWhy do metal tea pots have wooden handles?
The correct answer is option A. Metal tea pots have wooden handles because wood is a poor conductor of heat compared to metal. This property prevents the handle from becoming too hot to touch, allowing users to safely pour hot tea without burning their hands. Option B is incorrect because the primarRead more
The correct answer is option A. Metal tea pots have wooden handles because wood is a poor conductor of heat compared to metal. This property prevents the handle from becoming too hot to touch, allowing users to safely pour hot tea without burning their hands. Option B is incorrect because the primary reason for wooden handles is heat insulation rather than electric shock prevention. Option C is irrelevant to the functional purpose of the handle. Option D is also irrelevant as cleanliness is not directly related to the choice of material for the handle. Therefore, option A best explains why metal tea pots often have wooden handles, as they provide thermal insulation and ensure user safety during handling.
See lessWater is used in hot water bags because
The correct answer is option C. Water is used in hot water bags because of its high specific heat capacity. This means it can absorb and retain a large amount of heat, making it effective for providing warmth when used in hot water bags. Options A, B, and D are not the primary reasons for choosing wRead more
The correct answer is option C. Water is used in hot water bags because of its high specific heat capacity. This means it can absorb and retain a large amount of heat, making it effective for providing warmth when used in hot water bags. Options A, B, and D are not the primary reasons for choosing water; rather, it’s the specific heat capacity that makes it suitable for this purpose. Water’s availability, affordability, and ease of heating may be secondary factors, but the main reason is its high specific heat, allowing it to store and release heat effectively for therapeutic use in hot water bags. Therefore, option C best explains why water is commonly used in hot water bags.
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