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Physics 1 Marks Question

Nuclei · Rajasthan Board (RBSE) STD 12 Science (Rajasthan - English Medium). 21 questions.

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21 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
What is the number of neutrons in the nucleus of an atom, if the mass number of atom is A and atomic number is $Z$ ?
Answer
(A - Z)
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Question 21 Mark
How many types of nuclear chain reactions are? Write the name of each.
Answer
These are of two types:
(1) Controlled (2) Uncontrolled.
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Question 31 Mark
How is the radius of a nucleus related to its mass number?###Write the relation between radius R and mass number A of a nucleus.
Answer
If the nucleus is considered approximately spherical with radius R and mass number A , then it has the following relation :
$R=R_0 A^{1 / 3}$ where $R_0$ is a constant.
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Question 41 Mark
What is called nuclear reaction?
Answer
Nuclear reaction is the process in which the collision of nuclear particles, brings difference in the structures of a large nucleus.
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Question 51 Mark
What will be the difference in the chemical properties of radioactive isotopes and stable isotopes of an element?
Answer
There is no difference, because the chemical properties depend on the electrons of the atom, whereas the number of neutrons in the atom varies in isotopes.
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Question 61 Mark
What is nuclear fusion?
Answer
At high temperature and pressure, light nuclei combines to form a heavy nucleus and release energy, this is called nuclear fusion.
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Question 71 Mark
Nuclear fusion reaction is more difficult than nuclear fission. Why?
Answer
High temperature of order of $10^7 K$ for nuclear fusion is necessary to have heat which is difficult to obtain.
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Question 91 Mark
What is the importance of nuclear binding energy?
Answer
To separate the nucleons of the nucleus from each other, energy equal to the nuclear binding energy has to be supplied externally.
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Question 101 Mark
What type of energy spectrum is there of $\alpha$-particles in radioactive disintegration?
Answer
Discrete and linear.
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Question 141 Mark
What is the average number of neutrons obtained per nucleus from the fission of uranium nucleus?
Answer
Approximately 2.5 .
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Question 161 Mark
What is the relationship between the radius R of a nucleus and the mass number (A) of an atom?
Answer
$R = R _{ o } A ^{1 / 3}$
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Question 201 Mark
What will be the relationship between the mass loss $\Delta M$ of a nucleus and its binding energy ( E )?
Answer
$E =\Delta M . c ^2$
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Question 211 Mark
The ratio of mass numbers of two nuclei is $1: 3$.
What is the ratio of their nuclear density?
Answer
Because nuclear density is same for all nuclei.
Hence $\rho_1: \rho_2:: 1: 1$.
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