Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 27

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Weekly Quiz Competition

Question 1
4 / -1

Consider two nuclei of the same radioactive nuclide. One of the nuclei was created in a supernova explosion 5 billion years ago. The probability of decay during the next time is

A
different for each nuclei

B
nuclei created in explosion decays first

C
nuclei created in the reactor decays first

D
independent of the time of creation
Question 2
4 / -1

A
69, 171

B
70, 172

C
68, 172

D
69, 172
Question 3
4 / -1

If half-life of radium is 77 days, its decay constant will be

A
3 × 10^-3 day^-1

B
9 × 10^-3 day^-1

C
1 × 10^-3 day^-1

D
6 × 10^-3 day^-1
Question 4
4 / -1

In a radioactive reaction
₉₂ X²³² → ₈₂ X²⁰⁴
the number of α - particles emitted is

A
7

B
6

C
5

D
4

Solution
Question 5
4 / -1

If in a nuclear fission, piece of uranium of mass 5.0 g is lost, the energy obtained in kWh is

A
1.25 × 10⁷

B
2.25 × 10⁷

C
3.25 × 10⁷

D
0.25 × 10⁷
Question 6
4 / -1

Which of the following fusion reactions will not result in the net release of energy
I. ⁶Li + ⁶Li
II. ⁴He + ⁴He
III. ¹²C + ¹²C
IV. ³⁵CI + ³⁵CI

A
I

B
II

C
III

D
IV
Question 7
4 / -1

A radioactive substance has an average life of 5 h. In a time of 5 h

A
half of the active nuclei decay

B
less than half of the active nuclei decay

C
more than half of the active nuclei decay

D
all active nuclei decay
Question 8
4 / -1

A
less than 1

B
greater 1

C
equal 1

D
depends on the mass of parent nucleus
Question 9
4 / -1

X + ¹⁴N₇ → ¹⁷O₈ + ¹P₁. What is the X?

A
Helium

B
Deutron

C
Neutrino

D
Positron

Solution
Question 10
4 / -1

A nucleus of mass M + ∆m is at rest and decays into two daughter nuclei of equal mass (M/2) each. Speed of light is c.
The speed of daughter nuclei is

A

B

C

D

Solution