Nuclear Chemistry Test

Result

Nuclear Chemistry Test - 9

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Weekly Quiz Competition

Question 1
4 / -1

What is the correct order of velocity of alpha (α ), beta (β) and gamma (γ) rays ?

A
α > β > γ

B
α > γ > β

C
γ > α > β

D
γ > β > α

Solution
Question 2
4 / -1

Loss of a beta particle is equivalent to

A
increase of one neutron only

B
decrease of one neutron only

C
Both (1) and (2)

D
None of the above

Solution
Question 3
4 / -1

β-particle is emitted in a radioactive reaction when

A
a proton changes to neutron

B
a neutron changes to proton

C
a neutron changes to electron

D
an electron changes to neutron

Solution
Question 4
4 / -1

Penetrating power of waves are

A
γ > α > β

B
γ < α > β

C
γ > X-ray

D
γ > α < β

Solution
Question 5
4 / -1

The half-life of ¹⁴C is 5570 yr. How many years will it take for 90% of a sample to decompose?

A
5.570 yr

B
171700 yr

C
18600 yr

D
50100 yr

Solution
Question 6
4 / -1

A radioactive isotope has a-life of 10 yr. What percentage of the original amount of it ramain after 20 yr?

A
0

B
12.5

C
8

D
25

Solution
Question 7
4 / -1

A
60 min

B
45 min

C
30 min

D
15 min

Solution
Question 8
4 / -1

If 8.0 g of a radioactive isotope has a half-life of 10 h. The half-life of 2.0 g of the same substance is

A
2.5 h

B
5 h

C
10 h

D
40 h
Question 9
4 / -1

For a radioactive decay the value of K = 2.7 × 10^-3 s^-1 and initial concentration is 160 mol/L. After 100 s the concentration of radioactive element is

A
72 mol/L

B
122 mol/L

C
50 mol/L

D
80 mol/L

Solution
Question 10
4 / -1

Half-life period of a radioactive element is 100 yr. How long will it take for its 93.75% decay ?

A
400 yr

B
300 yr

C
200 yr

D
193 yr

Solution