1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The ratio of specific heat capacities at constant pressure to that at constant volume for a given mass of a gas is $\frac{5}{2}$. If the percentage increase in volume of the gas while undergoing an adiabatic change is $\frac{3}{2}$, then the percentage decrease in pressure will be:
A
$\frac{15}{4}$
B
$\frac{3}{5}$
C
$\frac{4}{15}$
D
$\frac{5}{3}$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A planet is 121 times heavier than moon and has a diameter 9 times that of moon. If the escape velocity on the planet is $v$, then the escape velocity on the moon will be:
A
$\frac{11 v}{3}$
B
$\frac{33 v}{8}$
C
$\frac{8 v}{33}$
D
$\frac{3 v}{11}$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $1.24 \mu \mathrm{~m}$ is incident on it. The band gap (in eV ) for the semiconductor is
A
1 eV
B
1.1 eV
C
2.48 eV
D
0.7 eV
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
In a nuclear fusion reaction, two nuclei, $A$ and $B$ fuse to produce a nucleus $C$, releasing an amount of energy $\Delta \mathrm{E}$ in the process. If the mass defects of the three nuclei are $\Delta M_A, \Delta M_B$ and $\Delta M_C$ respectively, then which of the following relations is true? ( $c$ is the speed of light).
A
$\Delta M_A+\Delta M_B=\Delta M_C+\frac{\Delta E}{c^2}$
B
$\Delta M_A-\Delta M_B=\Delta M_C+\frac{\Delta E}{c^2}$
C
$\Delta M_A-\Delta M_B=\Delta M_C-\frac{\Delta E}{c^2}$
D
$\Delta M_A+\Delta M_B=\Delta M_C-\frac{\Delta E}{c^2}$
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