Nuclei Test

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Nuclei Test - 9

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Weekly Quiz Competition

Question 1
1 / -0

Cadmium rods are used in a nuclear reactor for

A
absorbing neutrons in any generation

B
speeding up slow neutrons

C
regulating the power level of the reactor

D
slowing down fast neutrons

Solution

Cd rods are used as a controlled rods to perform controlled chain reactions. Cd rods are capable of absorbing many neutrons without themselves fissioning. Controlled rods are used in nuclear reactors to control fission rate of uranium and plutonium.
Question 2
1 / -0

Which of the following cannot be emitted by radioactive substance during their decay?

A
Protons

B
Neutrinos

C
Electrons

D
Helium nuclei

Solution

Proton is not emitted by a nucleus.
Question 3
1 / -0

Which of the following particles can be added to the nucleus of an atom without changing its chemical properties?

A
Alpha Particles

B
Protons

C
Electrons

D
Neutrons

Solution

Chemical properties are changed by addition or removal of electrons or protons. Neutrons are neutral particles. So they don't alter chemical properties.
Question 4
1 / -0

The average number of neutrons released by the fission of one uranium atom is

A
1

B
2.5

C
2

D
3.0

Solution

₉₂U²³⁵+ ₀n^1 →→ ₉₂U^236 →→₅₆Ba¹⁴⁴+ ₃₆Kr⁸⁹+ 3 ₀n¹
The reaction shows that 3 neutrons are released during fission of Uranium atom.
Question 5
1 / -0

What is the main source of energy of the sun?

A
Nuclear fission of heavier unstable elements in the sun.

B
Nuclear fusion of lighter elements in the sun.

C
Combustion of pure carbon present in the sun.

D
Gravitational energy liberated during the slow contraction of the sun.

Solution

In this reaction two light nuclei are combined against proton-proton repulsion which requires temp. of order 10⁷ or 10⁸ Kelvin. This high temp. is possible only inside the core of stars like sun.
Question 6
1 / -0

The chemical behavior of an atom depends upon

A
the number of electrons orbiting around its nucleus

B
the number of protons in its nucleus

C
the number of neutrons in its nucleus

D
the number of nucleons in its nucleus

Solution

Chemical properties are altered by addition or removal of electrons.

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Re-Attempt Weekly Quiz Competition

Nuclei Test - 9

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Nuclei Test - 9

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SHARING IS CARING

Question 1

absorbing neutrons in any generation

speeding up slow neutrons

regulating the power level of the reactor

slowing down fast neutrons

Solution

Question 2

Protons

Neutrinos

Electrons

Helium nuclei

Solution

Question 3

Alpha Particles

Protons

Electrons

Neutrons

Solution

Question 4

1

2.5

2

3.0

Solution

Question 5

Nuclear fission of heavier unstable elements in the sun.

Nuclear fusion of lighter elements in the sun.

Combustion of pure carbon present in the sun.

Gravitational energy liberated during the slow contraction of the sun.

Solution

Question 6

the number of electrons orbiting around its nucleus

the number of protons in its nucleus

the number of neutrons in its nucleus

the number of nucleons in its nucleus

Solution

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