1
COMEDK 2024 Morning Shift
+1
-0

A one $\mathrm{kg}$ block of ice at $$-1.5^{\circ} \mathrm{C}$$ falls from a height of $$1.5 \mathrm{~km}$$ and is found melting. The amount of ice melted due to fall, if $$60 \%$$ energy is converted into heat is (Specific heat capacity of ice is $$0.5 \mathrm{~cal} \mathrm{~g}^{-1} \mathrm{~C}^{-1}$$, Latent heat of fusion of ice $$=80 \mathrm{~cal~g}^{-1}$$ )

A
1.69 g
B
10 g
C
16.9 g
D
17.9 g
2
COMEDK 2024 Morning Shift
+1
-0

An electric bulb of volume $$300 \mathrm{~cm}^3$$ was sealed off during manufacture at a pressure of $$1 \mathrm{~mm}$$ of mercury at $$27{ }^{\circ} \mathrm{C}$$. The number of air molecules contained in the bulb is, $$(\mathrm{R}=8.31 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$$ and $$N_A=6.02 \times 10^{23})$$

A
$$9.67 \times 10^{16}$$
B
$$9.65 \times 10^{15}$$
C
$$9.67 \times 10^{17}$$
D
$$9.65 \times 10^{18}$$
3
COMEDK 2023 Morning Shift
+1
-0

The mean energy per molecule for a diatomic gas is

A
$$\frac{5 k_B T}{N}$$
B
$$\frac{5 k_B T}{2 N}$$
C
$$\frac{5 k_B T}{2}$$
D
$$\frac{3 k_B T}{2}$$
4
COMEDK 2023 Morning Shift
+1
-0

A gas is taken through the cycle $$A \rightarrow B \rightarrow C \rightarrow A$$, as shown in figure. What is the net work done by the gas?

A
2000 J
B
1000 J
C
Zero
D
$$-2000$$ J
EXAM MAP
Medical
NEET