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1
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following statement is correct?

A

Heisenberg uncertainty principle can be applied to all the objects and for macroscopic objects the uncertainty is extremely large

B

Azimuthal Quantum number explains about spatial orientation of orbital

C

Photon has momentum as well as wavelength, but electrons do not have momentum and wavelength

D

In photoelectric effect if frequency $\mathrm{v}>v_o$, then photoelectrons are ejected with certain kinetic energy

2
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

In the photoelectric emission, the energy of the emitted electron is:

A

greater than the energy of the incident photon

B

smaller than the energy of the incident photon

C

same as that of the incident photon

D

proportional to the intensity of the incident photon

3
COMEDK 2026 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The Bohr orbit of the hydrogen atom ( $n=1$ ) is $0.530 \mathop {\rm{A}}\limits^{\rm{o}} $. The radius of the first excited state orbit in $\mathop {\rm{A}}\limits^{\rm{o}} $ is:

A

0.16

B

5.21

C

1.66

D

2.12

4
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
The number of electrons with azimuthal quantum numbers $l=1$ and $l=2$ for Cr in the ground state electronic configurations are respectively. [Given: $\mathrm{Cr}(\mathrm{Z}=24)$ ]
A
5 and 16
B
12 and 5
C
12 and 8
D
12 and 16
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