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Half Life Class 8 MCQ Questions With Answers
1.
The process of nuclear change in an atom of radioactive material is called...
nuclear decay
nuclear mass
isotopes
radon
2.
The solid black sections of the bars on the graph represent the percentages of
carbon-14 from the original sample that has not decayed
lead-206 decay product resulting from the radioactive decay
nitrogen-14 decay product resulting from the radioactive decay
uranium-238 from the original sample that has not decayed
3.
The half-life of Iodine-131 is 8 days. What does this mean?
The lifespan of Iodine-131 is 8 days
Iodine-131 takes 8 days to become a radioactive material
Iodine-131 takes 8 days to decay to half the amount of its original amount
Iodine-131 takes days to become a non-radioactive material
4.
After 22,800 years, approximately what percentage of the original carbon-14 remains?
15%
12.5%
6.25%
3.125%
5.
"A random and spontaneous process where an unstable nucleus emits radioactive radiation until the nucleus becomes more stable.."The statement above refer to...
Half -life
Nuclei decay
Radioactivity
Radioactive decay
6.
The radioactive surgery used in archaeology to date organic remains is...
C-12
U-238
C-14
U-235
7.
A sample of wood that originally contained 100 grams of carbon-14 now contains only 25 grams of carbon-14. Approximately how many years ago was this sample part of a living tree?
2,850 years
5,700 years
11,400 years
17,100 years
8.
A sample of Radium-228 decays from 100g to 12.5g. How many half lives did it experience?
1
2
3
4
9.
When and where were dropped the first two atomic bombs by US forces?
In 1945 over the Japanese cities of Hiroshima and Tokyo
In 1942 over the Japanese cities of Nagasaki and Tokyo
In 1942 over the Japanese cities of Hiroshima and Nagasaki
In 1945 over the Japanase cities of Hiroshima and Nagasaki
10.
Which radioactive element is used to determine the absolute age of late Pleistocene animal remains?
rubidium-87
uranium-238
potassium-40
carbon-14
11.
How much of an 800-gram sample of potassium-40 will remain after 3.9 × 10^9 years of radioactive decay?
50 grams
100 grams
200 grams
400 grams
12.
Radioactive carbon-14 is often useful in determining the absolute age of geologic samples because radioactive isotopes
decay at a regular rate
become less stable during decay
remain unchanged over time
stabilize after four half-lives
13.
Radioactive decay of 40K atoms in an igneous rock has resulted in a ratio of 25 percent 40K atoms to 75 percent. 40Ar and 40Ca atoms. How many years old is this rock?
0.3 x 10^9 years
1.3 x 10^9 years
2.6 x 10^9 years
3.9 x 10^9 years
14.
Iodine-131 has a half life of 8.07 days. What fraction of a sample of Iodine-131 is left unchanged after 16.14 days?
1/2
1/4
1/8
1/16
15.
According to the law of superposition, the oldest fossils are found
At the top of the rock layers
Near the bottom of the rock layers
In the middle of the rock layers
Somewhat near the surface
16.
Those patients who develop tyroid cancer are treated with a certain radioactive isotope before attending surgery. The isotope is ...
As-74
Tc-99
I-131
Na-24
17.
Select the correction definition for half-life.
The time it takes for all of the radioactive nuclei to decay.
The time it takes for half of the radioactive nuclei to decay.
Half the time it takes for all of the radioactive nuclei to decay.
Half the time it takes for half of the radioactive nuclei to decay.
18.
A bone sample contains only 1/4 of its original radioactive C14 content. How old is the bone sample?
1 C14 half-life
2 C14 half-lives
3 C14 half-lives
4 C14 half-lives
19.
Uranium has two isotopes but only one of them is radioactive. Which one?
U-235
U-238
20.
The radioactive isotope Nickel-63 has a half life of 100 years. How much of a 10 gram sample remains after 300 years?
1 gram
1.25 grams
0.50 grams
0.075 grams
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