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One end of iron rod of cross-sectional area A and length L is kept in a steambath. After same time steady state conditions prevail and Q unit of heat per second passes through any cross- section of the rod. The heat flow rate will be adversely affected if
- a)room temperature is decreased
- b)cross-sectional area of the rod increases
- c)rod is made longer
- d)iron rod is replaced by a copper rod of the same area and length.
Correct answer is option 'C'. Can you explain this answer?
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One end of iron rod of cross-sectional area A and length L is kept in ...
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Explanation:
When heat flows through a material, it experiences resistance due to the thermal conductivity of the material. The rate of heat flow or heat transfer is directly proportional to the temperature difference across the material and inversely proportional to the resistance offered by the material.
Effect of room temperature:
The room temperature does not directly affect the heat flow rate through the rod. The temperature difference across the rod is determined by the temperature of the steam bath and the temperature of the room. If the room temperature decreases, the temperature difference across the rod may increase, leading to an increased heat flow rate.
Effect of cross-sectional area:
The heat flow rate is directly proportional to the cross-sectional area of the rod. If the cross-sectional area increases, the heat flow rate will also increase. This is because a larger surface area allows for more heat transfer.
Effect of rod length:
The length of the rod has a significant impact on the heat flow rate. The longer the rod, the greater the resistance to heat flow. This is because heat has to travel a longer distance through the rod, encountering more resistance along the way. Therefore, if the rod is made longer, the heat flow rate will be adversely affected and decrease.
Effect of replacing iron with copper:
Copper has a higher thermal conductivity compared to iron. Thermal conductivity is a measure of a material's ability to conduct heat. If the rod is made of copper instead of iron, the heat flow rate will increase. This is because copper has a higher ability to conduct heat, resulting in less resistance to heat flow.
In conclusion:
Out of the given options, the correct answer is option 'C' - the heat flow rate will be adversely affected if the rod is made longer. The length of the rod directly affects the resistance to heat flow, leading to a decrease in the heat flow rate. The room temperature, cross-sectional area, and material composition (iron or copper) do not have an adverse effect on the heat flow rate.
When heat flows through a material, it experiences resistance due to the thermal conductivity of the material. The rate of heat flow or heat transfer is directly proportional to the temperature difference across the material and inversely proportional to the resistance offered by the material.
Effect of room temperature:
The room temperature does not directly affect the heat flow rate through the rod. The temperature difference across the rod is determined by the temperature of the steam bath and the temperature of the room. If the room temperature decreases, the temperature difference across the rod may increase, leading to an increased heat flow rate.
Effect of cross-sectional area:
The heat flow rate is directly proportional to the cross-sectional area of the rod. If the cross-sectional area increases, the heat flow rate will also increase. This is because a larger surface area allows for more heat transfer.
Effect of rod length:
The length of the rod has a significant impact on the heat flow rate. The longer the rod, the greater the resistance to heat flow. This is because heat has to travel a longer distance through the rod, encountering more resistance along the way. Therefore, if the rod is made longer, the heat flow rate will be adversely affected and decrease.
Effect of replacing iron with copper:
Copper has a higher thermal conductivity compared to iron. Thermal conductivity is a measure of a material's ability to conduct heat. If the rod is made of copper instead of iron, the heat flow rate will increase. This is because copper has a higher ability to conduct heat, resulting in less resistance to heat flow.
In conclusion:
Out of the given options, the correct answer is option 'C' - the heat flow rate will be adversely affected if the rod is made longer. The length of the rod directly affects the resistance to heat flow, leading to a decrease in the heat flow rate. The room temperature, cross-sectional area, and material composition (iron or copper) do not have an adverse effect on the heat flow rate.
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One end of iron rod of cross-sectional area A and length L is kept in a steambath. After same time steady state conditions prevail and Qunit of heat per second passes through any cross- section of the rod. The heat flow rate will be adversely affected ifa)room temperature is decreasedb)cross-sectional area of the rod increasesc)rod is made longerd)iron rod is replaced by a copper rod of the same area and length.Correct answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about One end of iron rod of cross-sectional area A and length L is kept in a steambath. After same time steady state conditions prevail and Qunit of heat per second passes through any cross- section of the rod. The heat flow rate will be adversely affected ifa)room temperature is decreasedb)cross-sectional area of the rod increasesc)rod is made longerd)iron rod is replaced by a copper rod of the same area and length.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for One end of iron rod of cross-sectional area A and length L is kept in a steambath. After same time steady state conditions prevail and Qunit of heat per second passes through any cross- section of the rod. The heat flow rate will be adversely affected ifa)room temperature is decreasedb)cross-sectional area of the rod increasesc)rod is made longerd)iron rod is replaced by a copper rod of the same area and length.Correct answer is option 'C'. Can you explain this answer?.
One end of iron rod of cross-sectional area A and length L is kept in a steambath. After same time steady state conditions prevail and Qunit of heat per second passes through any cross- section of the rod. The heat flow rate will be adversely affected ifa)room temperature is decreasedb)cross-sectional area of the rod increasesc)rod is made longerd)iron rod is replaced by a copper rod of the same area and length.Correct answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about One end of iron rod of cross-sectional area A and length L is kept in a steambath. After same time steady state conditions prevail and Qunit of heat per second passes through any cross- section of the rod. The heat flow rate will be adversely affected ifa)room temperature is decreasedb)cross-sectional area of the rod increasesc)rod is made longerd)iron rod is replaced by a copper rod of the same area and length.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for One end of iron rod of cross-sectional area A and length L is kept in a steambath. After same time steady state conditions prevail and Qunit of heat per second passes through any cross- section of the rod. The heat flow rate will be adversely affected ifa)room temperature is decreasedb)cross-sectional area of the rod increasesc)rod is made longerd)iron rod is replaced by a copper rod of the same area and length.Correct answer is option 'C'. Can you explain this answer?.
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ample number of questions to practice One end of iron rod of cross-sectional area A and length L is kept in a steambath. After same time steady state conditions prevail and Qunit of heat per second passes through any cross- section of the rod. The heat flow rate will be adversely affected ifa)room temperature is decreasedb)cross-sectional area of the rod increasesc)rod is made longerd)iron rod is replaced by a copper rod of the same area and length.Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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