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Almost all the raw energy is librated from
Light
Earth
Heat
All of these
Which of following is irreversible process
Slow compression of an elastic spring
Slow expansion of a gas
Slow evaporation of substances in isolated vessel
A chemical explosion
The efficiency of any heat engine can never be
100%
+ve
None of these
-ve
The unit o pressure of gas is
Pascal
All of these
Nm-2
Atmosphere
The energy processes, we use are
Reversible
Efficient
None of these
Not efficient
The molecules of an ideal gas exert
No force on each other
Force on each other
Pressure on each other
Large force on each other
The kinetic energy of molecules of an ideal gas at absolute zero is
Very high
Zero
First increases then decreases
Very low
Mercury is used as a thermometric substance because
All of these
Does not stick to glass
Has low specific heat
It is opaque
Size of the molecules is much smaller as compared to the
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