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Question
Assertion :Warming a room by a heat blower is an example of forced convection. Reason: Natural convection takes place due to gravity
Assertion :Warming a room by a heat blower is an example of forced convection. Reason: Natural convection takes place due to gravity
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Warming of the room by a heat blower is a form of convection because, the heat blower provides heat to molecules surrounding the device. The air blown from the device is hotter(and hence lighter), causing it to rise and the cool air to descend, the cool air on descending towards the blower gets further heated and rises. This cycle is carried on and the room heats up. The heating of the particles surrounding the blower is forced and hence called forced convection. (The statement is true)
Natural convection is a result of gravity warmer air(lighter) rises and the cooler air(heavier) descends. (The reason is true)
The reason is not the correct explanation, the key word is forced.
Warming of the room by a heat blower is a form of convection because, the heat blower provides heat to molecules surrounding the device. The air blown from the device is hotter(and hence lighter), causing it to rise and the cool air to descend, the cool air on descending towards the blower gets further heated and rises. This cycle is carried on and the room heats up. The heating of the particles surrounding the blower is forced and hence called forced convection. (The statement is true)
Natural convection is a result of gravity warmer air(lighter) rises and the cooler air(heavier) descends. (The reason is true)
The reason is not the correct explanation, the key word is forced.
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