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
Which of the following is used to absorb neutrons to control the chain reaction during nuclear fission?
- ABoron
- Bheavy water
- CUranium
- DPlutonium
Question 2 of 25
The charge present on alpha rays is-
- Atwo units of positive charge
- Bunit negative charge
- Cunit positive charge
- Dnone of these
Question 3 of 25
Isobars are formed by the emission of which of the following?
- Aalpha rays
- Bbeta rays
- CGamma rays
- DX-rays
Question 4 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 5 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 6 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 7 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 8 of 25
Which radioactive element is named after the country of its discoverer?
- ARadium
- BUranium
- CPolonium
- DPalladium
Question 9 of 25
Which scientist discovered gamma rays?
- APaul Willard
- BRutherford
- CRoentgen
- DDalton
Question 10 of 25
On what principle does the 'hydrogen bomb' work?
- Acontrolled fission reaction
- Buncontrolled fission reaction
- Ccontrolled fusion reaction
- Duncontrolled fusion reaction
Question 11 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 12 of 25
Radioactivity is a property of what?
- Aof electrons
- Bof protons
- Cof neutrons
- Dof the nucleus
Question 13 of 25
What is the unit of radioactivity?
- AAngstrom
- BCandela
- CFermi
- DCurie
Question 14 of 25
Which of the following elements is essential for the construction of a nuclear reactor?
- Alead
- BMagnesium
- CZirconium
- DCobalt
Question 15 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 16 of 25
What type of charge do β-rays carry?
- Apositive
- Bnegative
- CZero charge
- DNone of these
Question 17 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 18 of 25
'Alpha' (α) rays are-
- AH⁺ ions
- BHe⁺⁺ion
- Celectron
- DProton
Question 19 of 25
What should radioactive materials be kept in?
- APb
- Bsteel
- CFe
- DAI
Question 20 of 25
Which of the following is not a radioactive element?
- AAstatine
- Bfrancium
- Ctritium
- DZirconium
Question 21 of 25
Which of the following elements does not show natural radioactivity?
- AUranium
- BThorium
- Caluminum
- DPolonium
Question 22 of 25
Who discovered alpha and beta rays?
- ADalton
- BRoentgen
- CRutherford
- DWillard
Question 23 of 25
Graphite is used in nuclear reactors.
- Alike fuel
- Blike a lubricant
- Cdiluent-like
- Dnone of the above
Question 24 of 25
What do all radioactive substances finally turn into after decay?
- ACorundum
- Blead
- CCadmium
- Dzinc
Question 25 of 25
The half-life of a radioactive substance is 4 months. The time required for three-quarters of this substance to decay is
- Amonths
- B4 month
- C8 months
- D12 months