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MCQ Questions for CBSE Class 12 with Answers
MCQ Questions for CBSE Class 11 with Answers
MCQ Questions for CBSE Class 10 with Answers
MCQ Questions for CBSE Class 9 with Answers
MCQ Questions for CBSE Class 8 with Answers
MCQ Questions for CBSE Class 7 with Answers
MCQ Questions for CBSE Class 6 with Answers
MCQ Questions for CBSE Class 5 with Answers
MCQ Questions for CBSE Class 4 with Answers
MCQ Questions for CBSE Class 3 with Answers
MCQ Questions for CBSE Class 2 with Answers
MCQ Questions for CBSE Class 1 with Answers
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Half Life Class 10 MCQ Questions With Answers
1.
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
2.
After 22,800 years, approximately what percentage of the original carbon-14 remains?
15%
12.5%
6.25%
3.125%
3.
Which radioactive element is used to determine the absolute age of late Pleistocene animal remains?
rubidium-87
uranium-238
potassium-40
carbon-14
4.
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
5.
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
6.
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.
7.
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
8.
Gamma rays have
no mass
a huge mass
a small mass
an average mass
9.
What is the only difference between two different isotopes of the same element?
Number of neutrons
Number of protons
Number of electrons
Size of atom
10.
If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?
1 half-life
2 half-lives
3 half-lives
4 half-lives
11.
After the third half-life, how much of a radioactive sample is left?
1/2
1/3
1/16
1/8
12.
The diagram shows 32 atoms32 of the Red are the parent isotope 0 of the atoms are daughter isotopes How many half-lives have occurred?
0
1
2
3
13.
As a sample of Neon-19 undergoes radioactive decay, its half-life will
decrease
increase
remain the same
start over
14.
How many half-live will Ca-37 go through in 1092 ms?
1
3
6
9
15.
This is the correct equation for U-238 decay.
true
false
16.
Which isotope has a half-life of 5715 years?
Carbon-12
Cobalt-60
Carbon-14
Cesium-137
17.
How much time must pass for Hydrogen-3 to undergo 3 half-lives?
12.31 years
36.93 years
4.10 years
3.00 years
18.
Which of the following samples would have the greatest amount remaining after 28 days?
5g of Au-198
10g of I-131
5g of P-32
10g of Rn-222
19.
The half-life of strontium-90 is 25 years. How much strontium-90 was originally present if 0.25 g is present in a sample after 100 years?
4.0 g
2.0 g
0.13 g
0.25 g
20.
An isotope of cesium (cesium-137) has a half-life of 30 years. If 1.0 mg of cesium-137 disintegrates over a period of 90 years, how many mg of cesium-137 would remain?
0.5 mg
0.25 mg
0.125 mg
0.0625 mg
21.
What type of decay is being illustrated in following picture?
beta decay
alpha decay
22.
The half life of an element is 20 minutes. What % of the element remains after an hour?
0%
12.5%
20%
25%
23.
An isotope of silver has a half-life of 10 minutes. What fraction of the original mass would remain after one hour?
1/64
1/2
1/4
1/8
24.
Barium-122 has a half-life of 2 minutes. A fresh sample weighing 80.0 g was obtained. If it takes 10 minutes to set up an experiment using barium-122, how much barium-122 will be left when the experiment begins?
0.250 g
2.50 g
25.0 g
80.0 g
25.
A 2.5 gram sample of an isotope of strontium-90 was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific Test Site. The half-life of strontium-90 is 28 years. In what year will only 0.625 grams of this strontium-90 remain?
1988
2016
2044
2072
26.
This is the correct equation for the decay of Ra.
true
false
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