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Home
Atoms and Nuclei Test - 7
Atoms and Nuclei Test - 7
Result
Atoms and Nuclei Test - 7
/
Score
-
Rank
Time Taken:
-
Question
1/10
4 / -1
92
U
235
undergoes successive disintegrations with the end product of
82
Pb
203
. The number α and β-particles emitted are
Correct
Wrong
Skipped
A
α = 6, β = 4
Correct
Wrong
Skipped
B
α = 6, β = 0
Correct
Wrong
Skipped
C
α = 8, β = 6
Correct
Wrong
Skipped
D
α = 3, β = 3
Solutions
Question
2/10
4 / -1
Which of the following is a possible nuclear reaction ?
Correct
Wrong
Skipped
A
Correct
Wrong
Skipped
B
Correct
Wrong
Skipped
C
Correct
Wrong
Skipped
D
Solutions
Question
3/10
4 / -1
The radius of nucleus is
Correct
Wrong
Skipped
A
proportional to its mass number
Correct
Wrong
Skipped
B
inversely proportional to its mass number
Correct
Wrong
Skipped
C
proportional to the cube root of its mass number
Correct
Wrong
Skipped
D
not related to its mass number
Question
4/10
4 / -1
m
p
and m
n
are masses of proton and neutron, respectively. An element of mass M has Z protons and N neutrons then
Correct
Wrong
Skipped
A
M > (Zm
p
+ Nm
n
)
Correct
Wrong
Skipped
B
M = (Zm
p
+ Nm
n
)
Correct
Wrong
Skipped
C
M < (Zm
p
+ Nm
n
)
Correct
Wrong
Skipped
D
M may be grater than less than or equal to Zm
p
+ Nm
n
, depending on nature of element
Question
5/10
4 / -1
A nucleus with Z = 92 emits the following in a sequence : α, α, β
-
, β
-
, α, α, α, α, β
-
, β
-
, α, β
+
, β
+
, α. The Z of the resulting nucleus is
Correct
Wrong
Skipped
A
76
Correct
Wrong
Skipped
B
78
Correct
Wrong
Skipped
C
82
Correct
Wrong
Skipped
D
74
Question
6/10
4 / -1
A nucleus disintegrates into two nuclear parts which have their velocities in the ratio 2: 1. The ratio of their nuclear sizes will be
Correct
Wrong
Skipped
A
2
1/3
: 1
Correct
Wrong
Skipped
B
1 : 3
1/2
Correct
Wrong
Skipped
C
3
1/2
: 1
Correct
Wrong
Skipped
D
1 : 2
1/3
Solutions
Question
7/10
4 / -1
Correct
Wrong
Skipped
A
13.9 MeV
Correct
Wrong
Skipped
B
26.9 MeV
Correct
Wrong
Skipped
C
23.6 MeV
Correct
Wrong
Skipped
D
19.2 MeV
Question
8/10
4 / -1
When
3
Li
7
nuclei are bombarded by protons, and the resultant nuclei are
4
Be
8
. the emitted particles will be
Correct
Wrong
Skipped
A
α – particles
Correct
Wrong
Skipped
B
β – particles
Correct
Wrong
Skipped
C
γ – photons
Correct
Wrong
Skipped
D
neutrons
Solutions
Question
9/10
4 / -1
The mass number of nucleus is
Correct
Wrong
Skipped
A
sometimes equal to its atomic number
Correct
Wrong
Skipped
B
sometimes less than and sometimes more than its atomic number
Correct
Wrong
Skipped
C
always less than its atomic number
Correct
Wrong
Skipped
D
always more than its atomic number
Question
10/10
4 / -1
A free neutron decays spontaneously into
Correct
Wrong
Skipped
A
a proton, an electron and anti-neutrino
Correct
Wrong
Skipped
B
a proton, an electron and aneutrino
Correct
Wrong
Skipped
C
a proton and electron
Correct
Wrong
Skipped
D
a proton, an electron, a neutrino and an anti-neutrino
Re-attempt
-
Correct (
-
)
Wrong (
-
)
Skipped (
-
)
1
2
3
4
5
6
7
8
9
10
Re-attempt
-
Correct (
-
)
Wrong (
-
)
Skipped (
-
)
1
2
3
4
5
6
7
8
9
10
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