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1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
Select the correct statement from the following:
A
Nuclear force is a long range force
B
Nuclear force is the weakest force in nature
C
Nuclear force is a non central force
D
Nuclear force depends on the charge of the nucleons
2
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
When ${ }^{10} \mathrm{~B}_5$ nuclei are bombarded by neutrons, one of the resultant nuclei is ${ }^7 \mathrm{Li}_3$. Then the emitted particle will be:
A
Alpha particle
B
Neutrons
C
Gamma particle
D
Beta particle
3
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
What is the frequency ' $\nu$ ' of the electron in Bohr's first orbit of radius ' $r$ ' of the hydrogen atom?
A
$v=\frac{e^2}{4 \pi \varepsilon_0 h r}$
B
$v=\frac{e^2}{2 \pi \varepsilon_0 h r^2}$
C
$v=\frac{e^2}{4 \pi \varepsilon_0 h r^2}$
D
$v=\frac{e^2}{2 \pi \varepsilon_0 h r}$
4
COMEDK 2025 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0
To get 300 MW electric power for half an hour, how much mass is to be completely converted into energy?
A
$6 \times 10^{-2} \mathrm{~kg}$
B
$3 \times 10^{-6} \mathrm{~kg}$
C
$6 \times 10^{-3} \mathrm{~kg}$
D
$6 \times 10^{-6} \mathrm{~kg}$
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