Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 32

Score
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Weekly Quiz Competition

Question 1
4 / -1

During a nuclear fusion reaction

A
A heavy nucleus breaks into two fragments by itself

B
A light nucleus bombarded by thermal neutrons breaks up

C
A heavy nucleus bombarded by thermal neutrons breaks up

D
Two light nuclei combine to give a heavier nucleus and possibly other products.
Question 2
4 / -1

Velocities of light in vacuum and glass are represented by C and C_g. When electrons move through glass with a velocity v, there is emitted a visible radiation in glass, if

A
υ > C_g

B
u < C_g

C
u > C

D
u > C_g/C
Question 3
4 / -1

Neutrons are more effective for producing nuclear reactions with nuclei compared to protons because

A
neutrons have more kinetic energy

B
neutrons emit beta particles

C
neutrons are unaffected by electric fields

D
neutrons are lighter than protons
Question 4
4 / -1

The statistics obeyed by neutrino is

A
Fermi – Dirac

B
Bose – Einstein

C
Maxwell – Boltzman

D
All of the above.
Question 5
4 / -1

Two nucleons are at a separation of 1 fm. The net force between them is F₁ if both are neutrons, F₂ if both are protons, and F₃ if one is a proton and the other is a neutron.

A
F₁ > F₂ > F₃

B
F₂ > F₁ > F₃

C
F₁ = F₃ > F₂

D
F₁ = F₂ > F₃
Question 6
4 / -1

The wavelength of gamma-rays is of the order of

A
10^–7 metre

B
10^–10 metre

C
10^–12 metre

D
10^–8 metre
Question 7
4 / -1

The decay constant of a radioactive sample is λ. The half-life and mean life of the sample are respectively given by

A

B

C

D

Solution
Question 8
4 / -1

In the uranium radioactive series, the initial nucleus is ₉₂U²³⁸ and that the final nucleus is ₈₂Pb²⁰⁶. When uranium nucleus decays to lead, the number of α particles and β particles emitted are

A
8α, 6 β

B
6α, 7 β

C
6α, 8 β

D
4α, 3 β

Solution
Question 9
4 / -1

The counting rate observed from a radioactive source at t = 0 second was 1600 counts per second and at t = 8 seconds, it was 100 counts per second. The counting rate observed, as counts per second at t = 6 seconds will be

A
400

B
300

C
200

D
150

Solution
Question 10
4 / -1

The half life of At 215 is 100μ sec. If a sample contains 215 mg of At 215, the activity of the sample initially is

A
10² Bq

B
3 × 10¹⁰ Bq

C
4.18 × 10²⁴ Bq

D
1.16 × 10⁵ Bq

Solution