1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which, of the following is true of the Balmer series of the hydrogen spectrum?

a. The series is in the visible region.

b. The entire series falls in the ultraviolet region

c. The entire series falls in the infrared region

d. The series is partly in the visible region and partly in the infrared region

A
b
B
c
C
a
D
d
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
If the binding energy per nucleon in $3 \mathrm{Li}^7$ and ${ }_2 \mathrm{He}^4$ nuclei are respectively 5.60 MeV and 7.06 MeV , then energy of $p$ in the reaction $p+{ }_3 \mathrm{Li}^7 \rightarrow 2{ }_2 \mathrm{He}^4$ is
A
12.28 MeV
B
13.28 MeV
C
28.28 MeV
D
17.28 MeV
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
From a circular disc of radius 2 R , a smaller circular disc is cut with radius of the larger disc as its diameter. The centre of the hole is at a distance of $R$ from the centre of the original disc. The distance of the centre of mass of the remaining portion from the centre is:
A
$\frac{R}{3}$
B
$\frac{R}{4}$
C
$\frac{R}{6}$
D
$\frac{R}{2}$
4
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
$\frac{5}{3}$
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