Atoms and Nuclei (NEET Physics): Questions 20 - 25 of 67

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Question number: 20

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

According to Bohr’s theory the moment of momentum of an electron revolving in second orbit of hydrogen atom will be,

Choices

Choice (4) Response
a.

2πh

b.

πh

c.

hπ

d.

πh

Question number: 21

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

The third line of Balmer series of an ion equivalent to hydrogen atom has wavelength of 108.5 nm The ground state energy of an electron of this ion will be

Choices

Choice (4) Response
a.

3.4 eV

b.

122.4 eV

c.

13.6 eV

d.

54.4 eV

Question number: 22

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

The value of the kinetic energy divided by the total energy of an electron in a Bohr orbit is

Choices

Choice (4) Response
a.

2

b.

-1

c.

0.5

d. All of the above

Question number: 23

» Atoms and Nuclei » Hydrogen Spectrum

Assertion-Reason▾

Assertion (Ꭺ)

Hydrogen atom consists of only one electron but its emission spectrum has many lines.

Reason (Ꭱ)

Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are false
b. Ꭺ is false but Ꭱ is true
c. Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
d. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 24

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

The ratio of the frequencies of the long wavelength limits of Lyman and Balmer series of hydrogen spectrum is

Choices

Choice (4) Response
a.

27: 5

b.

5: 27

c.

4: 1

d.

1: 4

Question number: 25

» Atoms and Nuclei » Energy Levels

MCQ▾

Question

In nature there may not be an element for which the principal quantum number 4, then the total possible number of electrons will be,

Choices

Choice (4) Response
a.

32

b.

64

c.

4

d.

60

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