Atoms and Nuclei (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 28 - 33 of 69

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Question number: 28

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

When a hydrogen atom is raised from the ground state to an excited state

Choices

Choice (4) Response

a.

P. E. increases and K. E. decreases

b.

kinetic energy and potential energy increase

c.

K. E. and P. E. decrease

d.

P. E. decreases and K. E. increases

Question number: 29

» Atoms and Nuclei » Bohr Model

MCQ▾

Question

As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionized Li atom (Z = 3) is

Choices

Choice (4) Response

a.

122.4

b.

40.8

c.

1.51

d.

13.6

Question number: 30

» Atoms and Nuclei » Bohr Model

Assertion-Reason▾

Assertion (Ꭺ)

Bohr postulated that the electrons in stationary orbits around the nucleus do not radiate energy.

Reason (Ꭱ)

According to classical physics all moving electrons radiate energy.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 31

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

The Lyman series of hydrogen spectrum lies in the region

Choices

Choice (4) Response

a.

Visible

b.

Ultraviolet

c.

X-rays

d.

Infrared

Question number: 32

» Atoms and Nuclei » Mass-Energy Relation

MCQ▾

Question

If mass equivalent to one mass of electron is completely converted into energy then determine the energy liberated.

Choices

Choice (4) Response

a.

0.51 MeV

b.

2.12 MeV

c.

3.12 MeV

d.

1.51 MeV

Question number: 33

» Atoms and Nuclei » Nuclear Fission and Fusion

MCQ▾

Question

Which of the following are not examples of nuclear fusion?

(1) Formation of Ba and Kr from U 235

(2) Formation of Pu 235 from Th 235

(3) Formation of water from hydrogen and oxygen

(4) Formation of He from H

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

1 and 3 are correct

c.

1, 2 and 3 are correct

d.

2 and 4 are correct

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