Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 65

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Weekly Quiz Competition

Question 1
4 / -1

The binding energy per nucleon of O¹⁶ 7.97 MeV and that of O¹⁷ is 7.75 MeV. The energy (in MeV) required to remove a neutron from O¹⁷ is

A
3.52

B
3.64

C
4.23

D
7.86

Solution
Question 2
4 / -1

The rest energy of an electron is 0.511 MeV. The electron is accelerated from rest to a velocity 0.5 c. The change in its energy will be

A
0.026 MeV

B
0.051 MeV

C
0.079 MeV

D
0.105 MeV

Solution
Question 3
4 / -1

A heavy nucleus at rest breaks into two fragments which fly off with velocities in the ratio 8 : 1. The ratio of radii of the fragments is

A
1 : 2

B
1 : 4

C
4 : 1

D
2 : 1

Solution
Question 4
4 / -1

For uranium nucleus how does its mass very with volume

A
m ∝ V

B
m∝1/V

C
m ∝ √V

D
m ∝ V²

Solution
Question 5
4 / -1

The rest mass of an electron as well as that of positron is 0.51 MeV. When an electron and positron are annihilate, they produce gamma-rays of wavelength (s)

A
0.012 Å

B
0.024 Å

C
0.012 Å to ∞

D
0.024 Å to ∞

Solution
Question 6
4 / -1

A nucleus with mass number 220 initially at rest emits an α–particle. If the Q value of the reaction is 5.5 MeV, calculate the kinetic energy of the α–particle

A
4.4 MeV

B
5.4 MeV

C
5.6 MeV

D
6.5 MeV

Solution
Question 7
4 / -1

The half life of radioactive Radon is 3.8 days. The time at the end of which 1/20^th of the Radon sample will remain undecayed is (Given log₁₀ e = 0.4343)

A
3.8 days

B
16.5 days

C
33 days

D
76 days

Solution
Question 8
4 / -1

If 10% of a radioactive material decays in 5 days, then the amount of original material left after 20 days is approximately

A
60%

B
65%

C
70%

D
75%

Solution
Question 9
4 / -1

A radioactive sample S1 having an activity of 5μCi has twice the number of nuclei as another sample S2 which has an activity of 10μCi. The half lives of S1 and S2 can be

A
20 years and 5 years, respectively

B
20 years and 10 years, respectively

C
10 years each

D
5 years each

Solution
Question 10
4 / -1

The half life period of a radioactive element X is same as the mean life time of another radioactive element Y. Initially both of them have the same number of atoms. Then

A
X and Y have the same decay rate initially

B
X and Y decay at the same rate always

C
Y will decay at a faster rate than X

D
X will decay at a faster rate than Y

Solution