Q.1.
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0%
nuclear fusion
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0%
nuclear fission
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0%
chemical reaction
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transmutation
Q.2.
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0%
-
0%
2)
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0%
-
0%
Q.3.
Consider the following nuclear reactions
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142
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144
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140
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146
Q.4.
In which of the following nuclear reaction neutrons is emitted ?
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0%
-
0%
2)
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0%
-
0%
Q.5.
Match Column I and Column II and select the correct answer using the code given below the lists,
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A = 2, B = 1, C = 3, D = 5
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A = 2, B = 3, C = 1, D = 5
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A = 5, B = 2, C = 1, D = 3
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0%
A = 3, B = 4, C = 1 , D = 2
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A = 4, B = 3, C = 2, D = 1
Q.6.
The age of a specimen t is related to the daughter/parent ratio of number of atoms (D/P) by the equation ( λ = decay constant)
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0%
-
0%
2)
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0%
-
0%
-
0%
Q.7.
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0%
2)
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0%
-
0%
Q.8.
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II A
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0%
IV B
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0%
VI B
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0%
VI A
Q.9.
which of the following isotopes occurs in nature?
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U233
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0%
U230
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0%
U226
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0%
U238
Q.10.
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β– emission
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0%
α– emission
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0%
β+ emission
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0%
K electron capture
Q.11.
The rate of disintegration of radioactive element changes from initial value of 10,000 dpm to 2,500 dpm in 50 days. The decay constant is
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0%
-
0%
2)
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0%
-
0%
Q.12.
If 3/4 quantity of radioactive element disintegrates in two hours, its half-
life would be
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1 hour
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0%
45 minutes
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0%
30 minutes
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15 minutes
Q.13.
A radioactive isotope decays at such a rate that after 96 minutes, only 1/8 th of the original amount remains. The half-life of this nuclide in minutes is
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0%
12
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0%
24
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0%
32
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0%
48
Q.14.
What is the half life of a radioactive substance if 87.5 % of any given amount of the substance disintegrates in 40 minutes ?
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10 min
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0%
20 min
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0%
160 min
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13 min 20 sec
Q.15.
The half – life period of polonium is 140 days. If one starts with 1 g of polonium, 75% of it would have undergone distintegration in
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0%
420 days
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280 days
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0%
105 days
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35 days
Q.16.
The activity of a radioactive nuclide (Xis 6.023 curie at a certain time ‘t’. If its disintegration constant is 3.7 × 104 Sec−1 , the mass of X after t sec is
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0%
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0%
2)
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0%
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0%
Q.17.
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0%
3 neutrons
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0%
2 – neutrons
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α − paticle
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0%
β − paticle
Q.18.
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0%
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0%
2)
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0%
-
0%
Q.19.
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0%
0.029
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0%
-0.029
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0%
0.058
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0%
-0.058
Q.20.
Wooden artifact and a freshly cut down tree give 7.6 and 15.2 counts min-1 g-1 of carbon (t1/2 = 5760 years) respectively. The age of the artifact is
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5760 years
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2)
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0%
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0%
Q.21.
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α, β, γ
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β, α, γ
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0%
γ, α, β
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0%
β, γ, α
Q.22.
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0%
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0%
2)
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0%
-
0%
