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Nucleus Physics - Nucleus

Rajasthan Board (RBSE) - STD 12 Science - Physics (Rajasthan - English Medium). 65 questions in this chapter.

Question types

Nucleus question types

65 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.

65
Questions
6
Question groups
5
Question types
Sample Questions

Nucleus questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 2M.C.Q (1 Marks)1 Mark
Half-life of radioactive substance is :
  • A
    $0.6931 \times \lambda$
  • B
    $\frac{\log 10^2}{\lambda}$
  • ✓
    $\frac{0.6931}{\lambda}$
  • D
    $\frac{\text { Average age }}{0.6931}$

Answer: C.

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Q 3M.C.Q (1 Marks)1 Mark
Density of nucleus is about :
  • A
    $2.29 \times 10^7 kg m ^{-3}$
  • B
    $2.29 \times 10^{-7} kg m ^{-3}$
  • ✓
    $2.29 \times 10^{17} kg m ^{-3}$
  • D
    $2.29 \times 10^{-17} kg m ^{-3}$

Answer: C.

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Q 4M.C.Q (1 Marks)1 Mark
1 amu (u) is equivalent to :
  • A
    $1.66 \times 10^{-27} g$
  • ✓
    $1.66 \times 10^{-27} kg$
  • C
    $1.66 \times 10^{-27} mg$
  • D
    $1.66 \times 10^{-27} MeV$

Answer: B.

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Q 61 Marks Question1 Mark
A radioactive nucleus undergoes a series of decays as per following scheme :
$A \xrightarrow{(\alpha)} A _1 \xrightarrow{(\beta)} A _2 \xrightarrow{(\beta)} A _3$.
The atomic number and mass number of Nuclei 'Á' are 92 and 238 respectively then what are these numbers for A3.
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Q 92 Marks Questions2 Marks
Define the term 'Half-life' of a radioactive substance. Two different radioactive substances have half-lives $T _1$ and $T _2$ and number of undecayed atoms at an instant, $N _1$ and $N _2$, respectively. Find the ratio of their activities at that instant.
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Q 163 Marks Question3 Marks
Pick up (i) Isotones, (ii) Isotopes, (iii) Isobars among the following:
$ {}_{6}^{12}C, {}_{2}^{3}He, {}_{80}^{198}Hg, {}_{1}^{3}H, {}_{79}^{197}Au, {}_{6}^{14}C $.
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Q 174 Marks Questions4 Marks
What do you mean by nuclear fission ?
On disintegration of one atom of ${}^{235}U$ the amount of energy obtained is 200 MeV. The power obtained in a reactor is 1000 kilowatt. How many atoms are disintegrated per second in the reactor? What is the decay in mass per hour?
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Q 225 Marks Questions5 Marks
Write four properties of $\gamma$-rays. What will be the difference between velocity of $\gamma$-ray of wavelength 0.01 Å and X-ray of wave-length 3 Å.
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Q 245 Marks Questions5 Marks
What do you mean by chain reaction? What difficulties arise to obtain chain reactions and how are they removed? Explain critical mass in this reference.
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