1
AP EAPCET 2025 - 23rd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The work done by 6 moles of helium gas when its temperature increases by $20^{\circ} \mathrm{C}$ at constant pressure is (Universal gas constant $=8.31 \mathrm{Jmol}^{-1} \mathrm{~K}^{-1}$ )

A

807.2 J

B

887.2 J

C

997.2 J

D

1007.2 J

2
AP EAPCET 2025 - 23rd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If a heat engine and a refrigerator are working between the same two temperatures $T_1$ and $T_2\left(T_1>T_2\right)$, then the ratio of efficiency of heat engine to coefficient of performance of refrigerator is

A

$\frac{\left(T_1-T_2\right)}{T_1 T_2}$

B

$\frac{\left(T_1+T_2\right)}{T_1 T_2}$

C

$\frac{\left(T_1-T_2\right)^2}{T_1 T_2}$

D

$\frac{\left(T_1+T_2\right)^2}{T_1 T_2}$

3
AP EAPCET 2025 - 23rd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If the internal energy of 3 moles of a gas at a temperature of $27^{\circ} \mathrm{C}$ is 2250 R , then the number of degrees of freedom of the gas is

( $R=$ Universal gas constant)

A

3

B

5

C

4

D

6

4
AP EAPCET 2025 - 23rd May Evening Shift
MCQ (Single Correct Answer)
+1
-0

If two progressive sound waves represented by $y_1=3 \sin 250 \pi t$ and $y_2=2 \sin 260 \pi t$ (where displacement is in metre and time is in second) superimpose, then the time interval between two successive maximum intensities is

A

0.1 s

B

0.4 s

C

0.5 s

D

0.2 s