Atoms and Nuclei (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 63 - 68 of 69

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2142 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 550.00 or

Question number: 63

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

10 In the nuclear reaction,

the values of A and Z are-

Choices

Choice (4) Response

a.

A = 234, Z = 94

b.

A = 238, Z = 90

c.

A = 234, Z = 90

d.

A = 238, Z = 94

Question number: 64

» Atoms and Nuclei » Radioactivity

MCQ▾

Question

In the disintegration series

The value of Z and A respectively will be,

Choices

Choice (4) Response

a.

90,234

b.

91,231

c.

88,230

d.

92,240

Question number: 65

» Atoms and Nuclei » Mass Defect

MCQ▾

Question

If the mass defect in the formation of helium from hydrogen is 0.5%, then the energy obtained, in kWh, in forming helium from 1 kg of hydrogen will be,

Choices

Choice (4) Response

a.

1.25

b.

125 ⨯ 10 4

c.

1.25 ⨯ 10 8

d.

1.25 ⨯ 10 6

Question number: 66

» Atoms and Nuclei » Radioactivity

Appeared in Year: 2016

MCQ▾

Question

The half – life of a radioactive substance is . The time (in minutes) taken between 40 % decay and 85 % decay of the same radioactive substance is:

Choices

Choice (4) Response

a.

60

b.

30

c.

15

d.

45

Question number: 67

» Atoms and Nuclei » Hydrogen Spectrum

Appeared in Year: 2016

MCQ▾

Question

If an electron in a hydrogen atom jumps from the 3rd orbit to the 2nd orbit, it emits a photon of wavelength . When it jumps from the 4th orbit to the 3rd orbit, the corresponding wavelength of the photon will be –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 68

» Atoms and Nuclei » Radioactive Decay Law

Appeared in Year: 2017

MCQ▾

Question

Radioactive material has decay constant and material has decay constant . Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material to that will be ?

Choices

Choice (4) Response

a.

b.

c.

d.

f Page
Sign In