Physics
Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?

K1+k2/k1k2
K1k2/k1+k2
2k1k2/k1+k2
None

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Physics
Plants are dried up in winter due to frost because

There is mechanical loss of tissues and drought condition prevails
Respiration does not take place at low temperature
Evaporation does not take place
Photosynthesis does not take place at such low temperature

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Physics
For an ideal gas, which one of the following statements does not hold true?

There is no interactive force between the molecules.
The kinetic energies of all gas molecules are not same
The speed of all gas molecules is same
The potential energy of the gas molecules is zero

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