Nuclear Chemistry Test

Result

Nuclear Chemistry Test - 29

Score
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Rank
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Weekly Quiz Competition

Question 1
4 / -1

A
β^– emission

B
α^– emission

C
β⁺ emission

D
K electron capture

Solution
Question 2
4 / -1

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

A

B

C

D

Solution
Question 3
4 / -1

If 3/4 quantity of radioactive element disintegrates in two hours, its half- life would be

A
1 hour

B
45 minutes

C
30 minutes

D
15 minutes

Solution
Question 4
4 / -1

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

A
12

B
24

C
32

D
48

Solution
Question 5
4 / -1

What is the half life of a radioactive substance if 87.5 % of any given amount of the substance disintegrates in 40 minutes ?

A
10 min

B
20 min

C
160 min

D
13 min 20 sec

Solution
Question 6
4 / -1

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

A
420 days

B
280 days

C
105 days

D
35 days

Solution
Question 7
4 / -1

The activity of a radioactive nuclide (X100) is 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

A

B

C

D

Solution
Question 8
4 / -1

A
3 neutrons

B
2 – neutrons

C
α − paticle

D
β − paticle

Solution
Question 9
4 / -1

A

B

C

D

Solution
Question 10
4 / -1

A
0.029

B
-0.029

C
0.058

D
-0.058

Solution