Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 125

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Weekly Quiz Competition

Question 1
4 / -1

The activity of a radioactive sample is measured as 9750 counts per minute at t = 0 and as 975 counts per minute at t = 5 minutes. The decay constant is approximately

A
0.230 per minute

B
0.461 per minute

C
0.691 per minute

D
0.922 per minute

Solution
Question 2
4 / -1

A

B

C

D

Solution
Question 3
4 / -1

Consider the following two statements
A. Energy spectrum of α–particles emitted in radioactive decay is discrete
B. Energy spectrum of β–particles emitted in radioactive decay is continuous

A
Only A is correct

B
Only B is correct

C
A is correct but B is wrong

D
Both A and B are correct
Question 4
4 / -1

A nucleus of an element ₈₄X²⁰² emits anα-particlefirst, a β–particle next and then a gamma photon. The final nucleus formed has an atomic number

A
200

B
199

C
83

D
198

Solution
Question 5
4 / -1

3.8 days is the half-life period of a sample. After how many days, the sample will become 1/8th of the original substance

A
11.4

B
3.8

C
3

D
None of these

Solution
Question 6
4 / -1

A certain radioactive material _ZX^A starts emitting α and β particles successively such that the end product is _Z–3Y^A–8. The number of α and β particles emitted are

A
4 and 3 respectively

B
2 and 1 respectively

C
3 and 4 respectively

D
3 and 8 respectively

Solution
Question 7
4 / -1

A radioactive substance emits

A
α–rays

B
β–rays

C
γ–rays

D
All of these
Question 8
4 / -1

The large scale destruction, that would be caused due to the use of nuclear weapons is called

A
Nuclear holocaust

B
Thermo-nuclear reaction

C
Neutron reproduction factor

D
None of the above
Question 9
4 / -1

In beta decay

A
The parent and daughter nuclei have same number of protons

B
The daughter nucleus has one proton less than the parent nucleus

C
The daughter nucleus has one proton more than the parent nucleus

D
The daughter nucleus has one neutron more than the parent nucleus
Question 10
4 / -1

A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after5 years will be

A

B

C

D

Solution