Free & Premium Study Material · Online Courses · Instant Download+91 99398 78821 · support@downloadstore.in
downloadstoreSTUDY MATERIAL
LoginRegister🛒0

Radioactivity

57 MCQ questions with answers and explanations · page 2 of 3

Test yourself▶ 25 question test▶ 50 question test

Q26. Which ray has the lowest penetrating power?

  1. Aα-ray
  2. BX-rays
  3. Cγ-ray
  4. Dβ-ray
Show answer & explanation

Answer: A) α-ray

Q27. Which radioactive element is named after the country of its discoverer?

  1. ARadium
  2. BUranium
  3. CPolonium
  4. DPalladium
Show answer & explanation

Answer: C) Polonium

Q28. Which of the following elements does not show natural radioactivity?

  1. AUranium
  2. BThorium
  3. Caluminum
  4. DPolonium
Show answer & explanation

Answer: C) aluminum

Q29. Which of the following is used to absorb neutrons to control the chain reaction during nuclear fission?

  1. ABoron
  2. Bheavy water
  3. CUranium
  4. DPlutonium
Show answer & explanation

Answer: A) Boron

Q30. Which of the following is not a radioactive element?

  1. AAstatine
  2. Bfrancium
  3. Ctritium
  4. DZirconium
Show answer & explanation

Answer: D) Zirconium

Q31. What should radioactive materials be kept in?

  1. APb
  2. Bsteel
  3. CFe
  4. DAI
Show answer & explanation

Answer: A) Pb

Q32. What change occurs in atomic number and atomic mass due to emission of a B-particle?

  1. AAtomic number increases by 1 and atomic mass remains unchanged
  2. BAtomic number decreases by 1 and atomic mass remains unchanged
  3. CAtomic number remains unchanged and atomic mass increases by 1
  4. DAtomic number remains unchanged and atomic mass decreases by 1
Show answer & explanation

Answer: A) Atomic number increases by 1 and atomic mass remains unchanged

Q33. What change in atomic number and atomic mass occurs due to emission of an α-particle?

  1. AAtomic number increases by 1 and atomic mass remains unchanged
  2. BAtomic number decreases by 1 and atomic mass remains unchanged
  3. CAtomic number decreases by 2 and atomic mass increases by 4
  4. DDecrease in atomic number by 2 and atomic mass by 4
Show answer & explanation

Answer: D) Decrease in atomic number by 2 and atomic mass by 4

Q34. The substance formed after 1 β emission from Na²² is-

  1. AMg
  2. BMn
  3. CAg
  4. DPb
Show answer & explanation

Answer: A) Mg

Q35. How many α and β particles will be emitted in ₉₂U²³⁶ ₈₇U²²⁴?

  1. A3α, 4β
  2. B3α, 5β
  3. C7α, 3β
  4. D3α, 1β
Show answer & explanation

Answer: D) 3α, 1β

Q36. If the amount of a radioactive substance is doubled, then the rate of radioactive decay-

  1. Aremains unchanged
  2. Bhalf remains
  3. Cincreases by √2 times
  4. Ddoubles up
Show answer & explanation

Answer: A) remains unchanged

Q37. If ₉₂U²³⁸ decays to form ₉₁Pa²³⁴, how many α and β particles are emitted?

  1. A1α and 1β
  2. B2α and 2β
  3. C1α and 2β
  4. D2α and 1β
Show answer & explanation

Answer: A) 1α and 1β

Q38. 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

  1. A140 days
  2. B70 days
  3. C210 days
  4. D280 days
Show answer & explanation

Answer: A) 140 days

Q39. If the half-life period of a radioactive substance is one day, then what fraction of its initial quantity will remain after 4 days?

  1. A12.5%
  2. B26.5%
  3. C6.5%
  4. D16.5%
Show answer & explanation

Answer: C) 6.5%

Q40. The half-life of a radioactive substance is 4 months. The time required for three-quarters of this substance to decay is

  1. Amonths
  2. B4 month
  3. C8 months
  4. D12 months
Show answer & explanation

Answer: C) 8 months

Q41. What is the system called that uses radioactivity to determine the age of prehistoric materials?

  1. ARadium dating
  2. BUranium dating
  3. Ccarbon dating
  4. DDeuterium dating
Show answer & explanation

Answer: C) carbon dating

Q42. How is the age of the Earth estimated?

  1. AFrom uranium dating
  2. Bfrom carbon dating
  3. Cfrom the atomic clock
  4. Dfrom the biological clock
Show answer & explanation

Answer: A) From uranium dating

Q43. Radiocarbon dating is used to estimate the age of what?

  1. Asoil
  2. Bmemorial
  3. Cfossil
  4. Drocks
Show answer & explanation

Answer: C) fossil

Q44. Who first used the term 'radioactivity'?

  1. AHenri Becquerel
  2. BMarie Curie
  3. CRutherford
  4. DDe Broglie
Show answer & explanation

Answer: A) Henri Becquerel

Q45. Which particle is needed to continue the continuous process of uranium fission?

  1. Aelectron
  2. BProton
  3. CNeutron
  4. DPositron
Show answer & explanation

Answer: C) Neutron

Q46. 'Who invented the atomic bomb?

  1. AMadame Curie
  2. BPierre Curie
  3. CAuto Han
  4. DAlbert Einstein
Show answer & explanation

Answer: C) Auto Han

Q47. On what principle does a nuclear power plant work?

  1. Afragmentation
  2. Bfusion
  3. Cthermal combustion
  4. DThe combined effect of the above three
Show answer & explanation

Answer: A) fragmentation

Q48. Which of the following elements is essential for the construction of a nuclear reactor?

  1. Alead
  2. BMagnesium
  3. CZirconium
  4. DCobalt
Show answer & explanation

Answer: C) Zirconium

Q49. Which of the following is a source of solar energy?

  1. Anuclear fission
  2. Bnuclear fusion
  3. Cartificial radioactivity
  4. DX-ray emission
Show answer & explanation

Answer: B) nuclear fusion

Q50. Graphite is used in nuclear reactors.

  1. Alike fuel
  2. Blike a lubricant
  3. Cdiluent-like
  4. Dnone of the above
Show answer & explanation

Answer: C) diluent-like

123
← Periodic Classification of ElementsUptron (likely referring to Plasma or Ionization) →
💬