Nuclei Test

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Nuclei Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is used as standard for determination of atomic mass unit?

A
$$O^{16}$$

B
$$C^{12}$$

C
$$H^{1}$$

D
$$O^{17}$$

Solution

Atomic mass of a compound is measured in atomic mass units abbreviated as amu or u. One atomic mass unit is defined as $$\frac{1}{12}^{th}$$ of mass of a single carbon-12 atom.
Question 2
1 / -0

The velocity of a particle is $$60$$% of velocity of light. Then the percentage increase in its mass is

A
$$75$$%

B
$$40$$%

C
$$25$$%

D
$$60$$%

Solution

By rest mass formula

$$m=\dfrac{mo}{\sqrt{1-\frac{V^{2}}{C^{2}}}}$$

$$=\dfrac{mo}{\sqrt{1-\frac{\left ( \dfrac{60}{100}c \right )^{2}}{C^{2}}}}$$ $$(\because V\ is\ 60\ \%\ of\ C)$$

$$=\dfrac{mo}{\sqrt{1-\dfrac{9}{25}}}$$

$$=\dfrac{mo}{\sqrt{\dfrac{16}{25}}}$$

$$=\dfrac{5mo}{4}$$

So, $$\Delta m=-mo-\dfrac{5}{4}m_{o}-m_{o}=\dfrac{m_{o}}{4}$$

So, percentage increase $$=\dfrac{m_{o}/4}{m_{o}}\times 100$$

$$=25\ \%\ $$
Question 3
1 / -0

Critical mass is minimum mass necessary for

A
chain reaction

B
fusion

C
hydrogen bomb

D
all of the above

Solution

The minimum amount of fissile material needed to maintain a nuclear chain reaction.
Question 4
1 / -0

Which one of the following properties of an element is not variable?

A
Valency

B
Atomic weight

C
Equivalent weight

D
All of these

Solution

Atomic weight is specific for a particular element and does not change under any circumstances.
Question 5
1 / -0

The binding energy of a nucleus is equivalent to

A
the mass of nucleus

B
the mass of proton

C
the mass of neutron

D
the mass defect of nucleus

Solution

To find the binding energy, add the masses of the individual protons, neutrons, and electrons, subtract the mass of the atom, and convert that mass difference to energy.
Question 6
1 / -0

Sun maintains its shining because of

A
the fission of helium

B
chemical reactoin

C
fusion of hydrogen nuclei

D
burning of carbon

Solution

The Sun produces energy by the nuclear fusion of hydrogen into helium in its core.
Question 7
1 / -0

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (Given 1 u = 931 MeV)

A
2.67 MeV

B
26.7 MeV

C
6.675 MeV

D
13.35 MeV

Solution
Question 8
1 / -0

Hydrogen bomb is based on

A
controlled chain reaction

B
uncontrolled chain reaction

C
nuclear fusion

D
nuclear fission

Solution

Hydrogen bomb is based on nuclear fusion. A large amount of nuclear energy is released by fusion of two light elements (elements with low atomic numbers). In a hydrogen bomb, two isotopes of hydrogen, deuterium(1 proton, 1 neutron) and tritium(1 proton, 2 neutron) are fused to form a nucleus of helium and a neutron. This fusion releases 17.6 MeV of energy. Also, there is no limit on the amount of the fusion that can occur.
Question 9
1 / -0

The ionisation energy of 10 times ionized sodium atom is

A
$$\frac{{13.6}}{{11}}eV$$

B
$$\frac{{13.6}}{{112}}eV$$

C
$$13.6 \times (11)^2 eV$$

D
$$13.6 eV$$

Solution

$$Na^{+10}$$
$$I.E.=13\cdot 6\times \frac {2^2}{n^2}$$
$$z=11, n=1$$
$$\therefore IE=13\cdot 6 \times (11)_{ev}^{2}$$
Question 10
1 / -0

For the nuclie with mass number > $$100$$

A
binding energy of the nucleus decreases on an average as A increases

B
binding energy of the nucleus increases on an average as A increases

C
The two nuclei fuse to form a bigger nuclide releasing energy

D
The nucleus essentially breaks up into two nuclides of equal mass releasing energy

Solution

From the above figure it is clearly visible that the binding energy of the nucleus decreases on an average as A increases

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Re-Attempt Weekly Quiz Competition

Nuclei Test - 15

Result

Nuclei Test - 15

Score

-

Rank

-

SHARING IS CARING

Question 1

$$O^{16}$$

$$C^{12}$$

$$H^{1}$$

$$O^{17}$$

Solution

Question 2

$$75$$%

$$40$$%

$$25$$%

$$60$$%

Solution

Question 3

chain reaction

fusion

hydrogen bomb

all of the above

Solution

Question 4

Valency

Atomic weight

Equivalent weight

All of these

Solution

Question 5

the mass of nucleus

the mass of proton

the mass of neutron

the mass defect of nucleus

Solution

Question 6

the fission of helium

chemical reactoin

fusion of hydrogen nuclei

burning of carbon

Solution

Question 7

2.67 MeV

26.7 MeV

6.675 MeV

13.35 MeV

Solution

Question 8

controlled chain reaction

uncontrolled chain reaction

nuclear fusion

nuclear fission

Solution

Question 9

$$\frac{{13.6}}{{11}}eV$$

$$\frac{{13.6}}{{112}}eV$$

$$13.6 \times (11)^2 eV$$

$$13.6 eV$$

Solution

Question 10

binding energy of the nucleus decreases on an average as A increases

binding energy of the nucleus increases on an average as A increases

The two nuclei fuse to form a bigger nuclide releasing energy

The nucleus essentially breaks up into two nuclides of equal mass releasing energy

Solution

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