1
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1

The spectral series which corresponds to the electronic transition from the levels $$n_2=5,6, \ldots$$ to the level $$n_1=4$$ is

A
Pfund series
B
Brackett series
C
Lyman series
D
Balmer series
2
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1

Water is used as a coolant in a nuclear reactor because of its

A
high thermal expansion coefficient
B
high specific heat capacity
C
low density
D
low boiling point
3
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1

Some energy levels of a molecule are shown in the figure with their wavelengths of transitions. Then :

NEET 2024 (Re-Examination) Physics - Atoms and Nuclei Question 1 English

A
$$\lambda_3>\lambda_2, \lambda_1=2 \lambda_2$$
B
$$\lambda_3>\lambda_2, \lambda_1=4 \lambda_2$$
C
$$\lambda_1>\lambda_2, \lambda_2=2 \lambda_3$$
D
$$\lambda_2>\lambda_1, \lambda_2=2 \lambda_3$$
4
NEET 2024 (Re-Examination)
MCQ (Single Correct Answer)
+4
-1

Select the correct statements among the following :

A. Slow neutrons can cause fission in $${ }_{92}^{235} \mathrm{U}$$ than fast neutrons.

B. $$\alpha$$-rays are Helium nuclei.

C. $$\beta$$-rays are fast moving electrons or positrons.

D. $$\gamma$$-rays are electromagnetic radiations of wavelengths larger than $$\mathrm{X}$$-rays.

Choose the most appropriate answer from the options given below :

A
A, B and C only
B
A, B and D only
C
A and B only
D
C and D only
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