In any fission process the ratio m a s s o f f i s s i o n p r o d u c t s m a s s o f p a r e n t n u c l e u s is [2005]

depends on the mass of parent nucleus

Physics - Nuclei - Quiz-4

In any fission process the ratio $\frac{m a s s o f f i s s i o n p r o d u c t s}{m a s s o f p a r e n t n u c l e u s}$ is [2005]

0%

less than 1
0%

greater than 1
0%

equal to 1
0%

depends on the mass of parent nucleus

The nucleus ${}_{48}C d^{115}$ , after two successive $β$ -decay will give [1988]

0%

${}_{46}P a^{115}$
0%

${}_{49}I n^{114}$
0%

${}_{50}S n^{113}$
0%

${}_{50}S n^{115}$

In nuclear fission process, energy is released because [2001]

0%

mass of products is more than mass of nucleus.
0%

total binding energy of products formed due to nuclear fission is more than that the parent fissionable material.
0%

total binding energy of products formed due to nuclear fission is less than parent fissionable material.
0%

mass of some particles is converted into energy.

The average binding energy of a nucleon inside an atomic nucleus is about [1989]

0%

8 MeV
0%

8 eV
0%

8 J
0%

8 erg

The energy liberated on complete fission of 1 kg of ${}_{92}^{235}U$ is (Assume 200 MeV energy is liberated on fission of 1 nucleus)

0%

$8.2 \times 10^{10} J$
0%

$8.2 \times 10^{9} J$
0%

$8.2 \times 10^{13} J$
0%

$8.2 \times 10^{16} J$

A nucleus with Z = 92 emits the following in a sequence:

$α, β^{-}, β^{-}, α, α, α, α, α, β^{-}, β^{-}, α, β^{+}, β^{+}, α$ . The Z of the resulting nucleus is [AIEEE 2003]

0%

74
0%

76
0%

78
0%

82

In nuclear fission, the percentage of mass converted into energy is about

0%

1%
0%

0.1%
0%

0.01%
0%

10%

The mass number of helium is 4 and that for suphur is 32. The radius of sulphur nuclei is larger than that of helium by

0%

$\sqrt{8}$
0%

4
0%

2
0%

8

In the nuclear decay given below

${}_{z}^{A}X \overset{}{\to} {}_{Z + 1}^{A}Y \overset{}{\to} {}_{Z - 1}^{A - 4}B_{*} \overset{}{\to} {}_{Z - 1}^{A - 4}B,$

$The particles emitted in the sequence are$

0%

$β, α, γ$
0%

$γ, β, α$
0%

$β, γ, α$
0%

$α, β, γ$

$I n t h e n u c l e u s o f {}_{11}^{23}N a, the number of protons, neutrons and electrons are$ :

0%

11, 12, 0
0%

23, 12, 11
0%

12, 11, 0
0%

23, 11, 12

A thorium nucleus is formed when a uranium nucleus emits an $α - particle$ . The atomic number of thorium is

0%

92
0%

90
0%

82
0%

94

The activity of the radioactive element decreases to one-third of the original activity $A_{0}$ in a period of 7 years. After a further lapse of 7 years, its activity will be:

0%

$A_{0}$
0%

$\frac{2}{3} A_{0}$
0%

$\frac{A_{0}}{6}$
0%

$\frac{A_{0}}{9}$

$The radius of germanium (Ge) nuclide is measured to be twice theradius of {}_{4}^{9}{Be} . The number of nucleons in Ge are$

0%

73
0%

74
0%

75
0%

72

In the reaction

${}_{1}^{2}H + {}_{1}^{3}H \to {}_{2}^{4}{He} + {}_{0}^{1}n$ ,

if the binding energies of ${}_{1}^{2}H, {}_{1}^{3}H, and {}_{2}^{4}{He}$ are respectively a, b, and c (in MeV), then the energy in (MeV) released in this reaction is:

0%

c + a - b
0%

c - a - b
0%

a + b + c
0%

a + b - c

A radioactive nucleus X decays to a stable nucleus 'y'. Then the graph of the rate of formation of 'y' against time 't' will be:

A stationary radioactivity nucleus of mass 210 units disintegrates into an alpha particle of mass 4 units and residual nucleus of mass 206 units. If the kinetic energy of the alpha particles is E, the kinetic energy of the residual nucleus is

0%

$(\frac{2}{105}) E$
0%

$(\frac{2}{103}) E$
0%

$(\frac{103}{105}) E$
0%

$(\frac{103}{2}) E$

The mass number of a nucleus is

0%

sometimes equal to its atomic number
0%

sometimes less than and sometimes more than its atomic number
0%

always less than its atomic number
0%

always more than its atomic number

If the nuclear radius of ${}_{27}A l$ is 3.6 Fermi, the approximate nuclear radius of ${}_{64}C u$ in Fermi is

(a)2.4 (b)1.2

0%
1
0%
2
0%
3
0%
4

Which of the following is not a mode of radioactive decay

0%
Positron emission
0%

Electron capture
0%

Fusion
0%

Alpha decay

$Two nucleons are at a separation of 1 fm . The net force between them is F_{1} if both are neutrons, F_{2} if both are protons and F_{3} if one is proton and other is a neutron . Hence$

0%

$F_{1} > F_{2} > F_{3}$
0%

$F_{2} > F_{1} > F_{3}$
0%

$F_{1} = F_{3} > F_{2}$
0%

$F_{1} = F_{2} > F_{3}$

The ratio of the radius of the nucleus to the radius of an atom is of the order of :

0%

$10^{- 5}$
0%

$10^{- 7}$
0%

$10^{- 2}$
0%

$10 °$

If a radioactive material reduces to 12.5% of its value in 24 days, then its half-life is:

0%

16 days
0%

8 days
0%

4days
0%

2 days

The half-life of a radioactive material depends on

0%

The initial amount of material
0%

Rate of disintegration
0%

Decay constant
0%

Temperature and pressure

Binding energy per nucleon is:

0%

Maximum for middle-order elements
0%

Maximum for lighter order elements
0%

Maximum for heavier order elements
0%

None of these

$In the equation {}_{13}^{27}{AI} + {}_{2}^{4}{He} \to {}_{15}^{30}P + X where X is -$

0%

${}_{1}^{1}P$
0%

${}_{1}^{2}H$
0%

${}_{2}^{4}{He}$
0%

${}_{0}^{1}n$

The half-life of a radioactivity isotope X is 100years. It decays to an element Y which is stable. The two elements are found to be ratio 1: 32 in a sample of a given rock. Assuming that at the time of formation of the rock there was only isotope X, then estimate the age of the rock.

0%

300 years
0%

400 years
0%

500 years
0%

600 years

A chain reaction is continuous due to

0%

Large mass defect
0%

Large energy
0%

Production of more neutrons in fission
0%

None of these

The binding energy per nucleon in deuterium and helium nuclei are $1.1 MeV$ and $7.0 MeV,$ respectively. When two deuterium nuclei fuse to form a helium nucleus, the energy released in the fusion is

0%

47.12 MeV
0%

34.4 MeV
0%

11.8 MeV
0%

23.6 MeV

The initial activity of a certain radioactive isotope was measured as 16000 counts per minute. That the only activity measured was due to this and that its activity after 12 hours was 2000 counts/minute. Its half-life, in hours, is nearest to-

0%

3.0
0%

9.0
0%

6.0
0%

4.0

How much energy is contained in a particle that has a mass of $1 μ g ?$

$1 . 9 \times 10^{7} J 2 . 9 \times 10^{16} J 3 . 9 \times 10^{5} J 4 . 9 \times 10^{11} J$

0%
1
0%
2
0%
3
0%
4

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Practice Physics Quiz Questions and Answers

0:0:1

Practice Physics Quiz Questions and Answers

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