
8.1 & 8.2
Authored by Edricia Edricia
Science
9th Grade
Used 1+ times

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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In 1895, a German physicist discovered that an unknown ray could pass through most substances and left shadow behind. He named the ray X-ray. He then captured the first X-ray image of his wife. His discovery was widely used in medical field. He did not patent his discovery and obtain the first Nobel Prize in Physics. Who is he?
Wilhelm Roentgen
Henri Becquerel
Pierre Curie
Isaac Newton
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
For his discovery of radioactivity, Henri Bacquerel was awarded Nobel Prize of Physics in 1903. What is the S.I. unit of radioactivity?
Curie
Moles
Bacquerel
Radac
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Radioactivity is due to _______
unstable nucleus
unstable electron
unstable proton
unstable neutron
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
When a nucleus become very big, it become unstable. The nuclear force holding the atomic nuclei together cannot counterbalance the repulsive electromagnetic force between nucleus. Uranium-238 emits helium particle and become more stable Thorium-234 particle. What type of radiation is this?
(α) alpha radiation
(β) beta radiation
(γ) gamma ray
X-ray
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the definition of half life?
Time taken for the number of undecayed nuclei to be reduced to half of its original number(value)
Time taken for the number of undecayed nuclei to be increased by two times of its original number(value).
Ratio of number of undecayed nuclei to original number of nuclei after half a year.
Total amount of radioactive emitted when the number of undecayed nuclei reduced to half in half a year.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Above shows the graph of count rate versus time of an radioactive material. Based on the graph, what will be the half life (T1/2) of this material?
10 days
20 days
30 days
40 days
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is correct regards of the electrical charges of electron, proton and neutron?
"-" = negatively charge
"+"= positively charge
"x"= neutral
Electron "-" ; Proton "+", Neutron "x"
Electron "+" ; Proton "-", Neutron "x"
Electron "-" ; Proton "x", Neutron "+"
Electron "x" ; Proton "-", Neutron "+"
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