NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev

Physics Class 12

Class 12 : NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev

The document NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev is a part of the Class 12 Course Physics Class 12.
All you need of Class 12 at this link: Class 12

Q.1. The energy equivalent of 0.5 g of a substance is :     (2020)
A: 1.5×1013 J
B: 0.5×1013J
C: 4.5×1016J
D: 4.5×1013J

Ans: D
Solution:
E = Δmc2 = 0.5 × 10-3 × (3 × 108)2 
= 0.5 ×10-3 × 9 ×1016
E = 4.5 ×1013 J

Q.2. When a uranium isotopeNEET Previous Year Questions (2014-20): Nuclei Notes | EduRevis bombarded with a neutron, it generates NEET Previous Year Questions (2014-20): Nuclei Notes | EduRevthree neutrons and :      (2020)
A:
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
B:
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
C:
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
D:
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev

Ans: C
Solution: 
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
92 = 36 + Z; ← A + 89 + 3 = 235 ⇒ A = 144
Z = 56

Q.3. For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is:    (2018)
A: 20
B: 10
C: 30
D: 15
Ans: 
A
Solution:
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev


Q.4. Radioactive material 'A' has decay constant '8 λ' and material 'B' has decay constant 'λ'. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that 'A' will be 1/e?     (2017)
A: 1/7λ
B: 1/8λ
C: 1/9λ
D: 1/10λ
Ans: A
Solution:

NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev

Q.5. The Binding energy per nucleon of NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev nuclei are 5.60 MeV and 7.06 MeV, respectively. In the nuclear reaction NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev the value of energy Q released is :    (2014)
A: 8.4 MeV
B: 17.3 MeV
C: 19.6 MeV
D: −2.4 MeV
Ans: B
Solution:

NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev

Q.6. A radio isotope ‘X’ with a half life 1.4 × 109 years decays to ‘Y’ which is stable. A sample of the rock from a cave was found to contain ‘X’ and ‘Y’ in the ratio 1 : 7. The age of the rock is    (2014)
A: 4.20 × 109 years
B: 8.40 × 109 years
C: 1.96 × 109 years
D: 3.92 × 109 years
Ans: A
Solution:

Ratio of X:Y is given = 1:7
That is,
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
⇒ 7mx = my
Let, the initial total mass is m.
NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev
Therefore, time taken to become 1/8 unstable part
= 3 x T1/2
= 3 x 1.4 x 109
= 4.2 x 109 y

Offer running on EduRev: Apply code STAYHOME200 to get INR 200 off on our premium plan EduRev Infinity!

Related Searches

Extra Questions

,

ppt

,

NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev

,

video lectures

,

mock tests for examination

,

Objective type Questions

,

Semester Notes

,

MCQs

,

pdf

,

Summary

,

Important questions

,

Exam

,

shortcuts and tricks

,

Previous Year Questions with Solutions

,

NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev

,

Sample Paper

,

Free

,

past year papers

,

study material

,

Viva Questions

,

NEET Previous Year Questions (2014-20): Nuclei Notes | EduRev

,

practice quizzes

;