JEE Main 2024 (Online) 4th April Evening Shift | Atoms and Nuclei Question 63 | Physics

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JEE Main 2024 (Online) 4th April Evening Shift

MCQ (Single Correct Answer)

-1

According to Bohr's theory, the moment of momentum of an electron revolving in $$4^{\text {th }}$$ orbit of hydrogen atom is:

$$2 \frac{h}{\pi}$$

$$\frac{h}{2 \pi}$$

$$\frac{h}{\pi}$$

$$8 \frac{h}{\pi}$$

JEE Main 2024 (Online) 4th April Morning Shift

MCQ (Single Correct Answer)

-1

Which of the following nuclear fragments corresponding to nuclear fission between neutron $$\left({ }_0^1 \mathrm{n}\right)$$ and uranium isotope $$\left({ }_{92}^{235} \mathrm{U}\right)$$ is correct :

$${ }_{56}^{140} \mathrm{Xe}+{ }_{38}^{94} \mathrm{Sr}+3{ }_0^1 \mathrm{n}$$

$${ }_{51}^{153} \mathrm{Sb}+{ }_{41}^{99} \mathrm{Nb}+3{ }_0^1 \mathrm{n}$$

$${ }_{56}^{144} \mathrm{Ba}+{ }_{36}^{89} \mathrm{Kr}+4{ }_0^1 \mathrm{n}$$

$${ }_{56}^{144} \mathrm{Ba}+{ }_{36}^{89} \mathrm{Kr}+3{ }_0^1 \mathrm{n}$$

JEE Main 2024 (Online) 1st February Evening Shift

MCQ (Single Correct Answer)

-1

From the statements given below :

(A) The angular momentum of an electron in $n^{\text {th }}$ orbit is an integral multiple of $\hbar$.

(B) Nuclear forces do not obey inverse square law.

(C) Nuclear forces are spin dependent.

(D) Nuclear forces are central and charge independent.

(E) Stability of nucleus is inversely proportional to the value of packing fraction.

Choose the correct answer from the options given below :

(B), (C), (D), (E) only

(A), (C), (D), (E) only

(A), (B), (C), (E) only

(A), (B), (C), (D) only

JEE Main 2024 (Online) 1st February Morning Shift

MCQ (Single Correct Answer)

-1

The minimum energy required by a hydrogen atom in ground state to emit radiation in Balmer series is nearly :

$13.6 \mathrm{eV}$

$1.5 \mathrm{eV}$

$12.1 \mathrm{eV}$

$1.9 \mathrm{eV}$

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