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

Which of the following is correct in the case of the Bohr model of atoms?

A. Predicts continuous emission spectra for all atoms

B. Assumes that the angular momentum of electrons is quantised

C. Predicts same emission spectrum for singly ionised neon atom and hydrogen atom

D. Predicts same emission spectrum for singly ionised neon atom and singly ionised helium atom

A
C
B
B
C
A
D
D
2
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The zener voltage in the circuit shown is $\mathrm{V}_{\mathrm{Z}}=20 \mathrm{~V}$. The load resistance $\mathrm{R}_{\mathrm{L}}=5 \mathrm{k} \Omega$ and the resistance $\mathrm{R}_{\mathrm{S}}=10 \mathrm{k} \Omega$. If the input voltage is $\mathrm{V} \mathrm{s}=100 \mathrm{~V}$, then the current through the zener diode in milliampere is:

COMEDK 2025 Evening Shift Physics - Semiconductor Devices and Logic Gates Question 1 English

A
8
B
6
C
4
D
5
3
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
The unit of universal gravitational constant is :
A
$\mathrm{N} \mathrm{m}^2 \mathrm{~kg}^2$
B
$\mathrm{N} \mathrm{m}^{-2} \mathrm{~kg}^{-2}$
C
$\mathrm{N} \mathrm{m}^{-2} \mathrm{~kg}^2$
D
$\mathrm{N} \mathrm{m}^2 \mathrm{~kg}^{-2}$
4
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
In the normal adjustment of an astronomical telescope, the objective and eyepiece are 36 cm apart. If the magnifying power of the telescope is 8 , find the focal lengths of the objective and eyepiece.
A
$\mathrm{F}_{\mathrm{O}}=28 \mathrm{~cm}, \mathrm{Fe}^{\mathrm{e}}=7 \mathrm{~cm}$
B
$\mathrm{F}_0=28 \mathrm{~cm}, \mathrm{~F}_{\mathrm{e}}=4 \mathrm{~cm}$
C
$\mathrm{F}_{\mathrm{o}}=32 \mathrm{~cm}, \mathrm{Fe}^{\mathrm{e}}=4 \mathrm{~cm}$
D
$\mathrm{F}_0=4 \mathrm{~cm}, \mathrm{~F}_{\mathrm{e}}=32 \mathrm{~cm}$
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