1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { If the nuclear radius of }{ }^{27} \mathrm{Al} \text { is } 3.6 \text { fermi, the nuclear radius of }{ }^{125} \mathrm{Fe} \text { is } $$

A
$$6 \times 10^{-10} \mathrm{~m}$$
B
$$6 \times 10^{-13} \mathrm{~m}$$
C
$$6 \times 10^{-15} \mathrm{~m}$$
D
$$6 \times 10^{-12} \mathrm{~m}$$
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A nucleus with mass number 190 initially at rest emits an alpha particle. If the $$\mathrm{Q}$$ value of the reaction is $$4.5 \mathrm{~MeV}$$, the kinetic energy of the alpha particle is

A
4 MeV
B
3.2 MeV
C
0.43 MeV
D
4.4 MeV
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

In a hydrogen atom, if electron is replaced by a particle which is 40 times heavier but has the same charge, then, the ratio of the radius of the first excited state of a normal hydrogen atom to the ground state of the above atom is

A
40 : 1
B
1 : 160
C
1 : 40
D
160 : 1
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

The shortest wavelengths of Paschen, Lymen and Balmer series are in the ratio

A
$$9: 1: 4$$
B
$$4: 1: 9$$
C
$$2:1:3$$
D
$$3: 1: 2$$
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