Nuclei Test

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Nuclei Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is the radio isotope in this pair ?
$$^{12}_{6}\,C, \, ^{14}_{6}\,C$$

A
$$^{14}_{6}\,C$$

B
$$^{12}_{6}\,C$$

C
Both of them

D
None of them

Solution
Question 2
1 / -0

Atomic number (Z) of a neutral atom and mass number (A) of an atom are equal to:
(Here n = number of neutrons and p = number of protons):

A
Z = n and A = n+p

B
Z = e and A = n+e

C
Z = p and A = n+p

D
Z = n and A = p+e

Solution

The atomic number = Z = no. of protons = p
The mass no. = A = no. of protons (p) + no. of neutrons(n) = n + p
Question 3
1 / -0

Which of the following is the radio isotope in this pair?
$$\underset{6}{12} C, \underset{6}{14} C$$

A
$$\underset{6}{12} C$$

B
$$\underset{6}{14} C$$

C
Both of them

D
None of them

Solution

The $${}_6^{14}C$$ has more number of neutrons than protons, so it is the radio isotope in this pair.
Question 4
1 / -0

Which of the following is the radio isotope in this pair?
$$_{ 15 }^{ 30 }{ P }, _{ 15 }^{ 32 }{ P }$$

A
$$_{ 15 }^{ 32 }{ P }$$

B
$$_{ 15 }^{ 30 }{ P } $$

C
Both of them

D
None of them

Solution

$${}_{15}^{32}P$$ is the radioactive isotope of phosphorous element.
As it has more number of neutrons than number of protons.
Question 5
1 / -0

An $$\alpha$$-particle captures an electron. What does it change to?

A
$$He^{2+}$$

B
$$He$$

C
$$He^{+}$$

D
$$\alpha$$

Solution

An $$\alpha$$ particle has two protons and two neutrons and zero electrons. It is written as $${}_2^4He^{2+}$$.
So if it captures an electron, the reaction is :
$${}_2^4He^{2+}+e^{-}\rightarrow{}_2^4He^+$$
Question 6
1 / -0

Which one of them is a radioisotope?

A
Cobalt-60

B
Carbon-12

C
Carbon-14

D
None of the above

Solution

Radioactive isotopes have unstable nucleus which emits energy and particles when it converts to stable form. Cobalt-60 is an isotope used to treat Cancer like problems.
Question 7
1 / -0

Which of the following is the radio isotope in this pair ?
$$^{30}_{15}\,P,\,^{32}_{15}\,P$$

A
$$^{32}_{15}\,P$$

B
$$^{30}_{15}\,P$$

C
Both of them

D
None of them
Question 8
1 / -0

Mass number is

A
Neutron + proton

B
Neutron + electron

C
Proton + electron

D
Neutron + proton + electron

Solution

$$ \begin{array}{l} \text { The mass number, also called atomic mass number } \\ \text { or nucleon number, is the total number of protons } \\ \text { and neutrons in an atomic nucleous. } \\ \text { i.e. Mass number = Neutron + Proton. } \\ \text { hence option A is correct } \end{array} $$
Question 9
1 / -0

Which of the following is the radio isotope in this pair ?
$$^{39}_{19}{K},\, ^{40}_{19}{K}$$

A
$$^{39}_{19}{K}$$

B
$$^{40}_{19}{K}$$

C
Both of them

D
None of them
Question 10
1 / -0

The mass defect per nucleon is called

A
binding energy

B
packing fraction

C
ionisation energy

D
excitation energy

Solution

Nuclear binding energy can be computed from the difference in mass of a nucleus, and the sum of the masses of the number of free neutrons and protons that make up the nucleus. Once this mass difference, called the mass defect or mass deficiency, is known, Einstein's mass-energy equivalence formula can be used to compute the binding energy of any nucleus. Early nuclear physicists used to refer to computing this value as a "packing fraction" calculation.

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Re-Attempt Weekly Quiz Competition

Nuclei Test - 33

Result

Nuclei Test - 33

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SHARING IS CARING

Question 1

$$^{14}_{6}\,C$$

$$^{12}_{6}\,C$$

Both of them

None of them

Solution

Question 2

Z = n and A = n+p

Z = e and A = n+e

Z = p and A = n+p

Z = n and A = p+e

Solution

Question 3

$$\underset{6}{12} C$$

$$\underset{6}{14} C$$

Both of them

None of them

Solution

Question 4

$$_{ 15 }^{ 32 }{ P }$$

$$_{ 15 }^{ 30 }{ P } $$

Both of them

None of them

Solution

Question 5

$$He^{2+}$$

$$He$$

$$He^{+}$$

$$\alpha$$

Solution

Question 6

Cobalt-60

Carbon-12

Carbon-14

None of the above

Solution

Question 7

$$^{32}_{15}\,P$$

$$^{30}_{15}\,P$$

Both of them

None of them

Question 8

Neutron + proton

Neutron + electron

Proton + electron

Neutron + proton + electron

Solution

Question 9

$$^{39}_{19}{K}$$

$$^{40}_{19}{K}$$

Both of them

None of them

Question 10

binding energy

packing fraction

ionisation energy

excitation energy

Solution

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