Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 124

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Weekly Quiz Competition

Question 1
4 / -1

The particles emitted by radioactive decay are deflected by magnetic field. The particles will be

A
Protons and α– particles

B
Electrons, protons and α - particles

C
Electrons, protons and neutrons

D
Electrons and α– particles
Question 2
4 / -1

In the given nuclear reaction A, B, C, D, E represents

A
A = 234, B = 90, C = 234, D = 91, E =β

B
A = 234, B = 90, C = 238, D = 94, E = α

C
A = 238, B = 93, C = 234, D = 91, E = β

D
A = 234, B = 90, C = 234, D = 93, E = α

Solution
Question 3
4 / -1

If half life of a radioactive element is 3 hours, after 9 hours its activity becomes

A
1/9

B
1/27

C
1/6

D
1/8

Solution
Question 4
4 / -1

A

B

C

D

Solution
Question 5
4 / -1

A radioactive sample with a half life of 1 month has the label \"Activity = 2 micro curies on 1.8.1991.\" What will be its activity two months later?

A
1.0 micro curies

B
0.5 micro curies

C
4 micro curies

D
8 micro curies
Question 6
4 / -1

At any instant the ratio of the amount of radioactive substances is 2 : 1. if their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances

A
1 : 1

B
2 : 1

C
1 : 2

D
1 : 4

Solution
Question 7
4 / -1

Which of the following isotopes is used for the treatment of cancer?

A
K⁴⁰

B
Co⁶⁰

C
Sr⁹⁰

D
I¹³¹
Question 8
4 / -1

If half-life of a radioactive atom is 2.3 days, then its decay constant would be

A
0.1

B
0.2

C
0.3

D
2.3

Solution
Question 9
4 / -1

A radioactive element ₉₀X²³⁸decays into ₈₃Y²²². Thenumber of β–particles emitted are

A
4

B
6

C
2

D
1

Solution
Question 10
4 / -1

A radio isotope has a half life of 75 years. The fraction of the atoms of this material that would decay in 150 years will be

A
66.6%

B
85.5%

C
62.5%

D
75%

Solution