Plants and living beings are examples of -
1. Isolated system
2. Adiabatic system
3. Open system
4. Closed system

For an adiabatic expansion of a perfect gas, $∆$P/P is equal to?

(1) $\frac{∆V}{V}$

(2) $-y\frac{∆V}{V}$

(3) $y\frac{∆V}{V}$

(4) $-y^2\frac{∆V}{V}$

If a gas at constant temperature and pressure expands,

then its

(1) Internal energy decreases

(2) Entropy increases and then decreases

(3) Internal energy increases

(4) Internal energy remains constant

If a gas absorbs 200 J of heat and expands by 500 ${\mathrm{cm}}^3$ against the constant pressure of 2x${10}^5$ Nm^-2 , then the change in internal energy is :

1. $-$200 J

2. $-$100J

3. +100J

4. + 300J

The internal energy of a substance does not depend upon

(1) Translational energy

(2) Vibrational energy

(3) Energy due to the gravitational pull

(4) Rotational energy

Internal energy (E) and pressure of a gas of unit volume are related

as

(1) $P=\frac{2}{3}E$
$$

(2) $P=\frac{3}{2}E$

(3) $P=\frac{E}{2}$

(4) P=2E

Identify the false statement among the following.

Considering entropy (S) as a thermodynamic parameter, the criterion for the spontaneity of any process is:


1. $∆S_{system}+∆S_{surroundings}>0$

2. $∆S_{system}-∆S_{surroundings}>0$

3. $∆S_{system}>\mathrm{0\; only}$

4. $∆S_{s\mathrm{urroundings}}>\mathrm{0\; only}$

For which of the following processes will the entropy increase? 

1. Reaction of magnesium with oxygen to form magnesium oxide

2. Reaction of nitrogen and hydrogen to form ammonia 

3. Sublimation of dry ice

4. Condensation of steam 

Which of the following is the correct first law thermodynamics equation?

(1) $U=∆Q-W$
$$

(2) $∆W=∆U+∆Q$
$$

(3) $∆U=∆W+∆Q$

(4) None of these