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My Question Performance Summary in Full Tests !
Questions Available: 12
Questions Attempted: 10
Number of Attempts: 15
Correct Attempts: 8
Total Time Spent: 00:30
Avg Time Per Question: 00:02
My Question Performance Summary in Full Tests
The half-life of a radioactive nuclide is 100 h. The fraction of original activity that will remain after 150 h would be
(1). \(\displaystyle \frac{1}{2}\)
(2). \(\displaystyle \frac{1}{2 \sqrt{2}}\)
(3). \(\displaystyle \frac{2}{3}\)
(4). \(\displaystyle \frac{2}{3 \sqrt{2}}\)
(1). \(\displaystyle \frac{1}{2}\)
(2). \(\displaystyle \frac{1}{2 \sqrt{2}}\)
(3). \(\displaystyle \frac{2}{3}\)
(4). \(\displaystyle \frac{2}{3 \sqrt{2}}\)
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
In the nuclear emission stated above, the mass number and atomic number of the product Q respectively, are:
(1). 288, 82
(2). 286,81
(3). 280, 81
(4). 286, 80
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
The half life of a radioactive substance is 20 minutes. In how much time, the activity of substance drops to \(\displaystyle \left(\frac{1}{16}\right)^{th}\) of its initial value?
(1). 40 minutes
(2). 60 minutes
(3). 80 minutes
(4). 20 minutes
(1). 40 minutes
(2). 60 minutes
(3). 80 minutes
(4). 20 minutes
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
In the given nuclear reaction, the element X is :
\(\displaystyle ^{23} _{11} \,Na \rightarrow\,X+e^+ + v\)
(1). \(\displaystyle ^{23} _{11} \,Na \)
(2). \(\displaystyle ^{23} _{10} \,Ne \)
(3). \(\displaystyle ^{22} _{10} \,Ne \)
(4). \(\displaystyle ^{22} _{12} \,Mg \)
\(\displaystyle ^{23} _{11} \,Na \rightarrow\,X+e^+ + v\)
(1). \(\displaystyle ^{23} _{11} \,Na \)
(2). \(\displaystyle ^{23} _{10} \,Ne \)
(3). \(\displaystyle ^{22} _{10} \,Ne \)
(4). \(\displaystyle ^{22} _{12} \,Mg \)
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A nucleus of mass number of 189 splits into two nuclei having mass number 125 and 64. The ratio of radius of two daughter nuclei respectively is :
(1). 1:01
(2). 4:05
(3). 5:04
(4). 25:16:00
(1). 1:01
(2). 4:05
(3). 5:04
(4). 25:16:00
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A radioactive nucleus \({}^{A}_{z}X\) undergoes spontaneous decay in the sequence
\({}^{A}_{z}X \, \rightarrow \, {}_{z-1}B \, \rightarrow \, {}_{z-3}C \, \rightarrow \, {}_{z-2}D\) where Z is the atomic number of element X. The possible decay particles in the sequence are
(1). \(\alpha,\, \beta^-,\, \beta^+\)
(2). \(\alpha,\, \beta^+,\, \beta^-\)
(3). \(\beta^+,\, \alpha,\, \beta^-\)
(4). \(\beta^-,\, \alpha,\, \beta^+\)
\({}^{A}_{z}X \, \rightarrow \, {}_{z-1}B \, \rightarrow \, {}_{z-3}C \, \rightarrow \, {}_{z-2}D\) where Z is the atomic number of element X. The possible decay particles in the sequence are
(1). \(\alpha,\, \beta^-,\, \beta^+\)
(2). \(\alpha,\, \beta^+,\, \beta^-\)
(3). \(\beta^+,\, \alpha,\, \beta^-\)
(4). \(\beta^-,\, \alpha,\, \beta^+\)
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energy per nucleon of unfragmented nuclei is 7.6 MeV while that of fragments is 8.5 MeV. The total gain in the binding energy in the process is
(1). 0.9 MeV
(2). 9.4 MeV
(3). 804 MeV
(4). 216 MeV
(1). 0.9 MeV
(2). 9.4 MeV
(3). 804 MeV
(4). 216 MeV
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
The energy equivalent of 0.5 g of a substance is
(1). 4.5 × 1013 J
(2). 1.5 × 1013 J
(3). 0.5 × 1013 J
(4). 4.5 × 1016 J
(1). 4.5 × 1013 J
(2). 1.5 × 1013 J
(3). 0.5 × 1013 J
(4). 4.5 × 1016 J
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
When a uraniumisotope \(\displaystyle {}^{235}_92U\) is bombarded with a neutron, itgenerates \(\displaystyle {}^{89}_{36}Kr\), three neutrons and
(1). \(\displaystyle {}^{91}_{40}Zr\)
(2). \(\displaystyle {}^{101}_{36}Kr\)
(3). \(\displaystyle {}^{103}_{36}Kr\)
(4). \(\displaystyle {}^{144}_{56}Ba\)
(1). \(\displaystyle {}^{91}_{40}Zr\)
(2). \(\displaystyle {}^{101}_{36}Kr\)
(3). \(\displaystyle {}^{103}_{36}Kr\)
(4). \(\displaystyle {}^{144}_{56}Ba\)
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
\(\alpha\)-particle consists of
(1). 2 electrons, 2 protons and 2 neutrons
(2). 2 electrons and 4 protons only
(3). 2 protons only
(4). 2 protons and 2 neutrons only
(1). 2 electrons, 2 protons and 2 neutrons
(2). 2 electrons and 4 protons only
(3). 2 protons only
(4). 2 protons and 2 neutrons only
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is
(1). 30
(2). 10
(3). 20
(4). 15
(1). 30
(2). 10
(3). 20
(4). 15
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02
Radioactive material A has decay constant \(8 \lambda\) and material B has decay constant \(\lambda\). Initially, they have same number of nuclei. After what time, the ratio of number of nuclei of material B to that A will be \(\frac{1}{e}\) ?
(1). \(\displaystyle \frac{1}{\lambda}\)
(2). \(\displaystyle \frac{1}{7 \lambda}\)
(3). \(\displaystyle \frac{1}{8\lambda}\)
(4). \(\displaystyle \frac{1}{9\lambda}\)
(1). \(\displaystyle \frac{1}{\lambda}\)
(2). \(\displaystyle \frac{1}{7 \lambda}\)
(3). \(\displaystyle \frac{1}{8\lambda}\)
(4). \(\displaystyle \frac{1}{9\lambda}\)
Number of Attempts: 2
Correct Attempts: 1
Time Taken: 00:04
Average Time: 00:02