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  #11  
Old Monday, November 08, 2010
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Default Correct Answer of Question 1
The answer of question 1 has also given wrong.

The correct answer of Question: 1 is (b)Convection
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  #12  
Old Tuesday, November 09, 2010
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#1mcq
convection and radiation its confusing................
but land and sea breezes blow due to the radiation...
convection is in flow of heat from liquid to other esp. liquid..
radiation is high quantum release of energy...
might be convection as intensity of heat is low
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  #13  
Old Tuesday, November 09, 2010
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Originally Posted by Ali-Raza View Post
The answer of question 1 has also given wrong.

The correct answer of Question: 1 is (b)Convection
brother its radiation. there is another post of mine about this particular mcq. that is why the coolent portion of the car is called "Radiator" ...

Furthermore Radiation related to quantum thingy, is the nuclear radiation!
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  #14  
Old Tuesday, November 09, 2010
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31. Walnuts can be broken in the hand by squeezing two together but not one. It is because of :

a) Work done
b) Power
c) Energy
d) Volume
e) None of these

Quote:
i thought impulse should be the answer but work done is also correct( seems logical) . this question is a teaser i am confused .

I THINK THIS IS WORK DONE....AS WORK IS DONE BY APPLYING SOME FORCE..OR POWE
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Old Tuesday, November 09, 2010
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31. Walnuts can be broken in the hand by squeezing two together but not one. It is because of :

a) Work done
b) Power
c) Energy
d) Volume
e) None of these

Quote:
i thought impulse should be the answer but work done is also correct( seems logical) . this question is a teaser i am confused .

I THINK THIS IS WORK DONE....AS WORK IS DONE BY APPLYING SOME FORCE..OR POWER
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  #16  
Old Tuesday, November 09, 2010
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Heat transfer through radiation primarily takes place in absence of a medium whereas convection always needs a medium to take place. I think the correct answer is convection. Fire does not radiate waves of energy as such like the Sun does for instance; instead it heats the air, and hence convects.
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  #17  
Old Tuesday, November 09, 2010
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Originally Posted by tknw01 View Post
Heat transfer through radiation primarily takes place in absence of a medium whereas convection always needs a medium to take place. I think the correct answer is convection. Fire does not radiate waves of energy as such like the Sun does for instance; instead it heats the air, and hence convects.
brother to understand the difference, lets analyze it with an example:

you are sitting in front of fire. You feel the intense heat feeling on your face and hands etc etc. this may be covection (as per your reasoning). But why do we forget convection is a circulation of a medium (water or air). so what will happen is that the air near the fire will warm up, rise to the ceiling, and the cold air will be pushed down. thus forming a complete circle.

In such a scenario, your back side should receive more heat than your front side because the air will form a circular flow. Hot air rises. Therefore if we do have that pinching sort of feeling on the faces, it means that we are receiving the radiation, unless ofcourse, convection means shooting hot air at my face
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  #18  
Old Tuesday, November 09, 2010
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Originally Posted by tknw01 View Post
Heat transfer through radiation primarily takes place in absence of a medium whereas convection always needs a medium to take place. I think the correct answer is convection. Fire does not radiate waves of energy as such like the Sun does for instance; instead it heats the air, and hence convects.
Let's analyze this question in the light of definitions of the two terms.

1. Convection:

heat transfer within the atmosphere involving the upward movement of huge volumes of warm air, leading to subsequent condensation and cloud formation


2. Radiation:

i. the emission of energy in the form of rays or waves
ii. energy emitted from a source in the form of rays or waves, e.g. heat, light, or sound
iii. the feeling of something being radiated, e.g. heat from a hot oven

[Source] Encarta®

I think even the layman would be able to know the answer now. It should of course be Radiation.
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  #19  
Old Tuesday, November 09, 2010
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I must say it is a great discussion going on! not only these MCQs, but many concepts r being cleared especially for non-science typos like me

Thank u so much guys!
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  #20  
Old Wednesday, November 10, 2010
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Originally Posted by xaara~hussain View Post
Agreed
See didnt i say verified MCQs? now the doubtful ones are being verified haha kidding
thank u so much
yes answer to 50 is glycogen. i just came to correct this one thank u
I think it is Glucose that is a source of CO2 in animals. Glycogen is just an intermediary form to store it in the body.
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