1
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The ion that is isoelectronic with $$\mathrm{CO}$$ is

A
$$\mathrm{O}_2^{+}$$
B
$$\mathrm{CN}^{-}$$
C
$$\mathrm{O}_2^{-}$$
D
$$\mathrm{N}_2^{+}$$
2
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A proton having mass equal to $$1.66 \times 10^{-27} \mathrm{~kg}$$ is accelerated to one tenth of the velocity of light. If its velocity can be measured to an accuracy of $$\pm 2 \%$$, what would be the uncertainty in its position?

A
$$7.9 \times 10^{-5} \mathrm{~m}$$
B
$$5.29 \times 10^{-14} \mathrm{~m}$$
C
$$6.0 \times 10^{-5} \mathrm{~m}$$
D
$$1.06 \times 10^{-13} \mathrm{~m}$$
3
COMEDK 2023 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The energy of an electron in the ground state of Hydrogen atom is $$-2.18 \times 10^{-18} \mathrm{~J}$$. What would be the energy associated with the second excited state of $$\mathrm{Li}$$ ?

A
$$ -2.18 \times 10^{-18} \mathrm{~J} $$
B
$$ -4.905 \times 10^{-18} \mathrm{~J} $$
C
$$ -0.242 \times 10^{-18} \mathrm{~J} $$
D
$$ -3.26 \times 10^{-18} \mathrm{~J} $$
4
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

Minimum number of nodes are present in

A
2s
B
3s
C
4s
D
5s
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