Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 132

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Weekly Quiz Competition

Question 1
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 2
4 / -1

A star initially has 10⁴⁰ deuterons. It produces energy via the processes ₁H² + ₁H²→₁H³ + p₁H² + ₁H³ →₂He⁴ + n The masses of the nuclei are as follows M(H²) = 2.014 amu; M(p)= 1.007 amu; M(n) =1.008 amu; M(He⁴) = 4.001 amu
If the average power radiated by the star is 10¹⁶ W, the deuteron supply of the star is exhausted in a time of the order of

A
10⁶ s

B
10⁸ s

C
10¹² s

D
10¹⁶ s

Solution
Question 3
4 / -1

A nucleus with mass number 220 initially at rest emits anα–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 4
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 5
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 6
4 / -1

From a newly formed radioactive substance (Half life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is

A
6 hours

B
12 hours

C
24 hours

D
128 hours

Solution
Question 7
4 / -1

A radioactive material decays by simultaneous emission of two particles with respective half lives 1620 and 810 years. The time (in years) after which one-fourth of the material remains is

A
1080

B
2430

C
3240

D
4860

Solution
Question 8
4 / -1

For a substance the average life for α–emission is 1620 years and for β emission is 405 years. After how much time the 1/4 of material remains after α and β emission

A
1500 years

B
300 years

C
449 years

D
810 years

Solution
Question 9
4 / -1

The half-life of radioactive Polonium (P₀) is 138.6 days. For ten lakh Polonium atoms, the number of disintegrations in 24 hours is

A
2000

B
3000

C
4000

D
5000

Solution
Question 10
4 / -1

A radioactive nucleus undergoes α–emission to form a stable element. What will be the recoil velocity of the daughter nucleus if v is the velocity of α–emission and A is the atomic mass of radioactive nucleus

A

B

C

D

Solution