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On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?
- a)On heating glass expands and lid contracts
- b)Lid expands more than the neck and thus slides easily
- c)Neck becomes slippery on heating
- d)Lids of the bottles cannot bear the heat
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
On a cold day, it is hard to open the lid of a tight container. But wh...
Correct option is B.
On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. This is because the lid being made of metals conducts heat better and faster and therefore expands more than the glass container.
On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. This is because the lid being made of metals conducts heat better and faster and therefore expands more than the glass container.
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Most Upvoted Answer
On a cold day, it is hard to open the lid of a tight container. But wh...
Explanation:
When a container is tightly closed, it means that the lid and the neck of the container are in close contact with each other. On a cold day, the molecules in both the lid and the neck slow down and move closer together, causing them to contract. This contraction makes it difficult to open the lid.
However, when the neck is gently heated, the molecules in the neck gain energy and start moving faster. This increase in molecular motion causes the molecules to spread out and the neck to expand. At the same time, the lid also gains energy and starts to expand, but it expands more than the neck due to its larger size and surface area.
Key Points:
- Cold temperature causes molecules to slow down and contract.
- Heating the neck increases molecular motion and causes expansion.
- Lid also expands, but more than the neck.
As a result of the differential expansion, the lid becomes slightly larger than the neck. This size difference allows the lid to slide more easily over the expanded neck, enabling the container to be opened with less force. The expansion of the lid also loosens the seal between the lid and the neck, further facilitating the opening process.
Conclusion:
So, on a cold day, gently heating the neck of a tight container allows for easier lid opening. The expansion of both the neck and the lid, with the lid expanding more than the neck, creates a size difference that helps overcome the initial tightness and facilitates the sliding motion required to open the container.
When a container is tightly closed, it means that the lid and the neck of the container are in close contact with each other. On a cold day, the molecules in both the lid and the neck slow down and move closer together, causing them to contract. This contraction makes it difficult to open the lid.
However, when the neck is gently heated, the molecules in the neck gain energy and start moving faster. This increase in molecular motion causes the molecules to spread out and the neck to expand. At the same time, the lid also gains energy and starts to expand, but it expands more than the neck due to its larger size and surface area.
Key Points:
- Cold temperature causes molecules to slow down and contract.
- Heating the neck increases molecular motion and causes expansion.
- Lid also expands, but more than the neck.
As a result of the differential expansion, the lid becomes slightly larger than the neck. This size difference allows the lid to slide more easily over the expanded neck, enabling the container to be opened with less force. The expansion of the lid also loosens the seal between the lid and the neck, further facilitating the opening process.
Conclusion:
So, on a cold day, gently heating the neck of a tight container allows for easier lid opening. The expansion of both the neck and the lid, with the lid expanding more than the neck, creates a size difference that helps overcome the initial tightness and facilitates the sliding motion required to open the container.
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On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?a)On heating glass expands and lid contractsb)Lid expands more than the neck and thus slides easilyc)Neck becomes slippery on heatingd)Lids of the bottles cannot bear the heatCorrect answer is option 'B'. Can you explain this answer?
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On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?a)On heating glass expands and lid contractsb)Lid expands more than the neck and thus slides easilyc)Neck becomes slippery on heatingd)Lids of the bottles cannot bear the heatCorrect answer is option 'B'. Can you explain this answer? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?a)On heating glass expands and lid contractsb)Lid expands more than the neck and thus slides easilyc)Neck becomes slippery on heatingd)Lids of the bottles cannot bear the heatCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?a)On heating glass expands and lid contractsb)Lid expands more than the neck and thus slides easilyc)Neck becomes slippery on heatingd)Lids of the bottles cannot bear the heatCorrect answer is option 'B'. Can you explain this answer?.
On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?a)On heating glass expands and lid contractsb)Lid expands more than the neck and thus slides easilyc)Neck becomes slippery on heatingd)Lids of the bottles cannot bear the heatCorrect answer is option 'B'. Can you explain this answer? for Class 7 2024 is part of Class 7 preparation. The Question and answers have been prepared according to the Class 7 exam syllabus. Information about On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?a)On heating glass expands and lid contractsb)Lid expands more than the neck and thus slides easilyc)Neck becomes slippery on heatingd)Lids of the bottles cannot bear the heatCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 7 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?a)On heating glass expands and lid contractsb)Lid expands more than the neck and thus slides easilyc)Neck becomes slippery on heatingd)Lids of the bottles cannot bear the heatCorrect answer is option 'B'. Can you explain this answer?.
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On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?a)On heating glass expands and lid contractsb)Lid expands more than the neck and thus slides easilyc)Neck becomes slippery on heatingd)Lids of the bottles cannot bear the heatCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?a)On heating glass expands and lid contractsb)Lid expands more than the neck and thus slides easilyc)Neck becomes slippery on heatingd)Lids of the bottles cannot bear the heatCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?a)On heating glass expands and lid contractsb)Lid expands more than the neck and thus slides easilyc)Neck becomes slippery on heatingd)Lids of the bottles cannot bear the heatCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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