Radioactivity: MCQ Test
25 questions · pick one option for each · submit when you finish to see your score and the correct answers.
Question 1 of 25
What should radioactive materials be kept in?
- APb
- Bsteel
- CFe
- DAI
Question 2 of 25
How is the age of the Earth estimated?
- AFrom uranium dating
- Bfrom carbon dating
- Cfrom the atomic clock
- Dfrom the biological clock
Question 3 of 25
The substance used as both moderator and refrigerant in nuclear reactors is –
- Afresh water
- Bheavy water
- Cliquid ammonia
- Dliquid hydrogen
Question 4 of 25
Which of the radiations emitted from the nucleus has the highest penetrating power?
- Aof alpha rays
- Bof beta rays
- Cof gamma rays
- Dnone of these
Question 5 of 25
Which radioactive element is named after the country of its discoverer?
- ARadium
- BUranium
- CPolonium
- DPalladium
Question 6 of 25
Which particle is needed to continue the continuous process of uranium fission?
- Aelectron
- BProton
- CNeutron
- DPositron
Question 7 of 25
The charge present on alpha rays is-
- Atwo units of positive charge
- Bunit negative charge
- Cunit positive charge
- Dnone of these
Question 8 of 25
What are γ-rays made of?
- Ameson particle
- Bneutrino particle
- CHiggs boson
- Delectromagnetic waves
Question 9 of 25
Which of the following rays has the lowest ionizing power?
- Aof α-rays
- Bof β-rays
- Cof γ-rays
- DNone of these
Question 10 of 25
Which scientist discovered gamma rays?
- APaul Willard
- BRutherford
- CRoentgen
- DDalton
Question 11 of 25
Which of the following is not a radioactive element?
- AAstatine
- Bfrancium
- Ctritium
- DZirconium
Question 12 of 25
Which of the following radioelements is used to measure the speed of blood flow in the human body?
- Aradio-phosphorus
- Bradioiodine
- CRadio-iron
- DRadio-sodium
Question 13 of 25
What is the system called that uses radioactivity to determine the age of prehistoric materials?
- ARadium dating
- BUranium dating
- Ccarbon dating
- DDeuterium dating
Question 14 of 25
Which of the following rays has the greatest penetrating power?
- Aof α-rays
- Bof β-rays
- Cof γ-rays
- DNone of these
Question 15 of 25
Which of the following rays has the highest ionizing power?
- Aof α-rays
- Bof β-rays
- Cof γ-rays
- DNone of these
Question 16 of 25
Who discovered 'radioactivity'?
- ARutherford
- BHenri Becquerel
- CRoentgen
- DEinstein
Question 17 of 25
Participates in radioactive changes-
- Avalence electrons of an atom
- Bcore electrons of an atom
- Cnucleus of an atom
- Dnone of these
Question 18 of 25
The lifetime of a radioactive substance is 70 days, then after how many days will one gram of the same substance be reduced to 0.25 grams
- A140 days
- B70 days
- C210 days
- D280 days
Question 19 of 25
β-rays are made up of-
- Afrom positively charged particles
- Bfrom negatively charged particles
- Cfrom neutral particles
- Dnone of these
Question 20 of 25
The emission of which of the following increases the atomic number of an element by one?
- Aalpha particles
- Bbeta particles
- CProton
- DNeutron
Question 21 of 25
In what order are the penetrating powers of α, β and γ in their descending order
- Aα, β, γ
- Bγ, β, α
- Cβ, α, γ
- Dγ, α, β
Question 22 of 25
What is the unit of radioactivity?
- AAngstrom
- BCandela
- CFermi
- DCurie
Question 23 of 25
Which of the following is used to absorb neutrons to control the chain reaction during nuclear fission?
- ABoron
- Bheavy water
- CUranium
- DPlutonium
Question 24 of 25
If ₉₂U²³⁸ decays to form ₉₁Pa²³⁴, how many α and β particles are emitted?
- A1α and 1β
- B2α and 2β
- C1α and 2β
- D2α and 1β
Question 25 of 25
What type of charge do β-rays carry?
- Apositive
- Bnegative
- CZero charge
- DNone of these