Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 60

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

A radio isotope has a half life of 75 years. The fraction of the atoms of this material that would decay in 150 years will be

A
66.6%

B
85.5%

C
62.5%

D
75%

Solution
Question 2
4 / -1

A

B

C

D

Solution
Question 3
4 / -1

The activity of a sample is 64 × 10^–5 Ci. Its half-life is 3 days. The activity will become 5 × 10^–6 Ci after

A
12 days

B
7 days

C
18 days

D
21 days

Solution
Question 4
4 / -1

A nucleus of an element ₈₄X²⁰² emits an α–particle first, 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 radioactive substance emits

A
α–rays

B
β–rays

C
γ–rays

D
All of these
Question 7
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 8
4 / -1

Given a sample of Radium-226 having half-life of 4 days. Find the probability, a nucleus isintegrates after 2 half lives

A
1

B
1/2

C
1.5

D
3/4

Solution
Question 9
4 / -1

A radioactive sample has half-life of 5 years. Probability of decay in 10 years will be

A
100%

B
75%

C
50%

D
25%

Solution
Question 10
4 / -1

A
A – 3, A – 4

B
Z – 1, A – 4

C
Z – 2, A – 4

D
Z, A – 2

Solution