Nuclear Test

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Nuclear Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Artificial disintegration with alpha particles of which of the following led to the discovery of neutron?

A
Be

B
Na

C
N

D
Ba

Solution

James Chadwick set up an experiment to test his hypothesis. Chadwick put a piece of beryllium in a vacuum chamber with some polonium. The polonium emitted alpha rays, which struck the beryllium. When struck, the beryllium emitted the mysterious neutral rays.
Question 2
1 / -0

In a nuclear reactor:

A
moderator is used to slow down the neutrons

B
moderator is used to control the number of neutrons

C
control rods are used to slow down the neutrons

D
coolant is used to slow down the neutrons

Solution

A moderator is used in nuclear reactors in order to slow down the speed of neutrons.
In nuclear engineering, a neutron moderator is a medium that reduces the speed of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving uranium-235 or a similar fissile nuclide.
Clearly, an obvious way to make a reactor work, and to make use of this characteristic of the 235U(n,f) cross-section, is to slow down the fast, fission neutrons. This can be accomplished, for example, when the neutrons collide with nuclei and scatter in some substance (a moderator).
Question 3
1 / -0

What is the binding energy of the hydrogen nucleus?

A
More than 13.6 eV

B
zero

C
Infinite

D
13.6 eV

Solution

Nucleus of hydrogen has only one proton. Hence its binding energy will be zero. The nuclear binding energy is the energy it takes to separate all the nucleons in a nucleus from each other. Since there is only the one nucleon, it's already separated from any other nucleons.
Question 4
1 / -0

The fusion of hydrogen into helium is more likely to take place:

A
at high temperature and high pressure

B
at high temperature and low pressure

C
at low temperature and low pressure

D
at low temperature and high pressure

Solution

The fusion of hydrogen into helium is more likely to take place at high temperature and high pressure, like the sun.
Question 5
1 / -0

Given M = mass of the nucleus, A = atomic mass. What is packing fraction?

A

B

C

D

Solution

Packing fraction: - It tells about the stability of a nucleus.
Packing fraction=isotonic mass=molecular mass (atomic mass)/atomic mass
p.f.=M-A/A
Question 6
1 / -0

Why does the fusion occur at high temperature?

A
kinetic energy is high enough to overcome repulsion between nuclei.

B
nuclei break up at high temperature

C
atoms are ionised at high temperature

D
molecules break up at high temperature

Solution

Fusion reactions takes place at temperature about 107K. It requires this high temperature so that nucleus are moving at very high speed, so that they have high kinetic energy and can overcome the repulsion between nuclei and come together.
Question 7
1 / -0

What amount of energy is released in the fission of ₉₅U²³⁵ ?

A
200 keV

B
20 eV

C
200 eV

D
200 MeV

Solution

The fission process represented by the equation, ₉₂U²³⁵+₀n¹→₅₆Ba¹⁴⁴+₃₆Kr⁸⁹+3₀n¹
Masses of reactants =234.39+1.01=235.4amu
Masses of products =143.28+88.89+3(1.01) =235.2amu
Energy released = mass difference =235.4−235.2=0.2amu=0.2×931∼200MeV
Question 8
1 / -0

In the following reaction
What is following value of a?

A
14

B
10

C
16

D
12

Solution

The sum of the atomic no. and atomic mass no. on the reactant and product should be equal .
therefore 9+4 = a+1
a = 12
Question 9
1 / -0

Which of the following statements is true for nuclear forces?

A
They are short range forces

B
They are equal in strength to the electromagnetic forces

C
They obey the inverse third power law of distance

D
They obey the inverse square law of distance

Solution

Nuclear forces are short range forces. This is the only correct answer. Others are wrong. They are the strongest forces in nature and do not obey inverse square law.
Question 10
1 / -0

A fusion bomb involves:

A
breaking of a heavy nucleus into a lighter ones

B
explosion of TNT

C
synthesis of lighter nuclei into heavier ones

D
burning of huge amount of coal

Solution

Nuclear fusion is the process by which two or more atomic nuclei join together, or “fuse,” to form a single heavier nucleus. During this process, matter is not conserved because some of the mass of the fusing nuclei is converted to energy, which is released.