Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 138

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Weekly Quiz Competition

Question 1
4 / -1

The nuclide ¹³¹I is radioactive, with a half-life of 8.04 days. At noon on January 1, the activity of a certain sample is 600Bq. activity at noon on January 24 will be

A
75Bq

B
Less than 75Bq

C
More than 75Bq

D
150Bq

Solution
Question 2
4 / -1

U²³⁸ decays into Th²³⁴ by the emission of an α– particle. There follows a chain of further radioactive decays, either by α– decay or by β – decay. Eventually a stable nuclide is reached and after that, no further radioactive decay is possible. Which of the following stable nuclides is the end product of the U²³⁸ radioactive decay chain

A
Pb²⁰⁶

B
Pb²⁰⁷

C
Pb²⁰⁸

D
Pb²⁰⁹

Solution
Question 3
4 / -1

If the mass of a radioactive sample is doubled, theactivity of the sample and the disintegration constant of the sample are respectively

A
Increases, remains the same

B
Decreases, increases

C
Decreases, remains same

D
Increases, decreases

Solution
Question 4
4 / -1

A
True

B
False

C
May be true at a particular pressure

D
None of the above
Question 5
4 / -1

Consider an initially pure `M\' g sample of ^AX, an isotope that has a half life of T hour. What is it\'s initial decay rate (N_A = Avagadro No)?

A

B

C

D

Solution
Question 6
4 / -1

At a given instant there are 25% undecayed radioactive nuclei. After 10 s the number of undecayed nuclei reduces to 6.25%, the mean life of the nuclei is

A
14.43 s

B
7.21 s

C
5 s

D
10 s

Solution
Question 7
4 / -1

Highly energetic electrons are bombarded on a target of an element containing 30 neutrons. The ratio of radii of nucleus to that of Helium nucleus is 14^1/3. The atomic number of nucleus will be

A
25

B
26

C
56

D
30

Solution
Question 8
4 / -1

The ratio of ionization energy of Bohr\'s hydrogen atom and Bohr\'s hydrogen like lithium atom is

A
1 : 1

B
1 : 3

C
1 : 9

D
None of these

Solution
Question 9
4 / -1

The fission of ²³⁵U can be triggered by the absorption of slow neutrons by a nucleus. Similarly a slow proton can also be used. This statements is

A
Correct

B
Wrong

C
Information is insufficient

D
None of these
Question 10
4 / -1

Consider a hypothetical annihilation of a stationary electron with a stationary positron. What is the wavelength of resulting radiation
(h = Planck\'s constant, c = speed of light, m₀ = rest mass)

A

B

C

D

Solution