Atoms and Nuclei Test

Result

Atoms and Nuclei Test - 61

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

What fraction of a radioactive material will get disintegrated in a period of two half-lives

A
Whole

B
Half

C
One-fourth

D
Three-fourth

Solution
Question 2
4 / -1

²³⁴U has 92 protons and 234 nucleons total in its nucleus. It decays by emitting an alpha particle. After the decay it becomes

A
²³²U

B
²³²Pa

C
²³⁰Th

D
²³⁰Ra

Solution
Question 3
4 / -1

During negative β–decay

A
Neutron converts into proton

B
Proton converts into neutron

C
Neutron proton ratio increases

D
None of the above
Question 4
4 / -1

A radioactive nucleus emits a beta particle. The parent and daughter nuclei are

A
Isotopes

B
Isotones

C
Isomers

D
Isobars

Solution
Question 5
4 / -1

99% of a radioactive element will decay between

A
6 and 7 half lives

B
7 and 8 half lives

C
8 and 9 half lives

D
9 half lives

Solution
Question 6
4 / -1

The masses of two radioactive substances are same and their half lives are 1 year and 2 years respectively. The ratio of their activities after 6 years will be

A
1 : 3

B
1 : 6

C
1 : 4

D
1 : 2

Solution
Question 7
4 / -1

In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life

A
69.3%

B
63%

C
50%

D
37%

Solution
Question 8
4 / -1

The S.I. unit of radioactivity is

A
Roentgen

B
Rutherford

C
Curie

D
Becquerel
Question 9
4 / -1

Half-life of a substance is 10 years. In what time, it becomes 1/4 th part of the initial amount

A
5 years

B
10 years

C
20 years

D
None of these

Solution
Question 10
4 / -1

If N₀ is the original mass of the substance of half-life period T_1/2 = 5 years, then the amount of substance left after 15 years is

A
N₀/8

B
N₀/16

C
N₀/2

D
N₀/4

Solution