1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A block of metal A is connected in series with another block of metal B such that the two metal blocks have the same area of cross sections. The thermal conductivity of metal A is K and the free end of metal A is at $80^{\circ} \mathrm{C}$. The temperature of the interface is $60^{\circ} \mathrm{C}$ and the free end of metal B is at $20^{\circ} \mathrm{C}$. Assuming the two metals have the same thickness, the conductivity of metal B is:
A
$2 K$
B
$4 K$
C
$\frac{K}{2}$
D
$\frac{K}{4}$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The mean energy per molecule for a diatomic gas is:
A
$\left(\frac{5}{2}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$
B
$\left(\frac{3}{2}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$
C
$\left(\frac{3}{2 N}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$
D
$\left(\frac{5}{2 N}\right) \mathrm{K}_{\mathrm{B}} \mathrm{T}$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
An LCR series ac circuit is at resonance with 10 V each across $\mathrm{L}, \mathrm{C}$ and R . If the resistance is halved, the respective voltage across $R, C$ and $L$ are
A
$5 \mathrm{~V}, 10 \mathrm{~V}, 10 \mathrm{~V}$
B
$10 \mathrm{~V}, 5 \mathrm{~V}, 5 \mathrm{~V}$
C
$5 \mathrm{~V}, 5 \mathrm{~V}, 5 \mathrm{~V}$
D
$10 \mathrm{~V}, 20 \mathrm{~V}, 20 \mathrm{~V}$
4
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
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