{"id":17644,"date":"2025-11-08T09:22:54","date_gmt":"2025-11-08T09:22:54","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=17644"},"modified":"2025-11-10T04:36:13","modified_gmt":"2025-11-10T04:36:13","slug":"atomic-and-nuclear","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/11\/08\/atomic-and-nuclear\/","title":{"rendered":"Atomic and Nuclear Top 100 MCQs With Answer and Explanation"},"content":{"rendered":"\n

1. The branch of physics that deals with structure and behavior of atoms is called<\/mark><\/strong>
A) Atomic physics
B) Nuclear physics
C) Classical mechanics
D) Thermodynamics
Answer:<\/strong> A) Atomic physics
Explanation:<\/strong> Atomic physics studies the structure and properties of atoms and their interactions.<\/p>\n\n\n\n

2. The branch of physics that deals with nuclei and nuclear reactions is called<\/mark><\/strong>
A) Nuclear physics
B) Atomic physics
C) Mechanics
D) Optics
Answer:<\/strong> A) Nuclear physics
Explanation:<\/strong> Nuclear physics focuses on the composition, structure, and transformations of atomic nuclei.<\/p>\n\n\n\n

3. The smallest particle of an element which retains its properties is<\/mark><\/strong>
A) Atom
B) Molecule
C) Proton
D) Electron
Answer:<\/strong> A) Atom<\/p>\n\n\n\n

4. An atom consists of<\/mark><\/strong>
A) Electrons, protons, and neutrons
B) Only electrons
C) Only protons
D) Only neutrons
Answer:<\/strong> A) Electrons, protons, and neutrons<\/p>\n\n\n\n

5. The central part of an atom is called<\/mark><\/strong>
A) Nucleus
B) Proton
C) Electron cloud
D) Orbit
Answer:<\/strong> A) Nucleus<\/p>\n\n\n\n

6. The nucleus is made up of<\/mark><\/strong>
A) Protons and neutrons
B) Electrons and protons
C) Only electrons
D) Positrons
Answer:<\/strong> A) Protons and neutrons<\/p>\n\n\n\n

7. The particles revolving around the nucleus are<\/mark><\/strong>
A) Electrons
B) Protons
C) Neutrons
D) Positrons
Answer:<\/strong> A) Electrons<\/p>\n\n\n\n

8. The charge on an electron is<\/mark><\/strong>
A) Negative
B) Positive
C) Neutral
D) Double positive
Answer:<\/strong> A) Negative<\/p>\n\n\n\n

9. The charge on a proton is<\/mark><\/strong>
A) Positive
B) Negative
C) Neutral
D) Zero
Answer:<\/strong> A) Positive<\/p>\n\n\n\n

10. A neutron has<\/mark><\/strong>
A) No charge
B) Positive charge
C) Negative charge
D) Double charge
Answer:<\/strong> A) No charge<\/p>\n\n\n\n

11. The mass of an atom is concentrated in<\/mark><\/strong>
A) The nucleus
B) Electrons
C) Outer shell
D) Orbit
Answer:<\/strong> A) The nucleus
Explanation:<\/strong> The nucleus contains protons and neutrons, which have almost all of the atom\u2019s mass.<\/p>\n\n\n\n

12. The first model of atom was proposed by<\/mark><\/strong>
A) J.J. Thomson
B) Rutherford
C) Bohr
D) Dalton
Answer:<\/strong> D) Dalton
Explanation:<\/strong> Dalton\u2019s atomic theory was the first to describe atoms as indivisible particles.<\/p>\n\n\n\n

13. The \u201cplum pudding model\u201d of the atom was proposed by<\/mark><\/strong>
A) J.J. Thomson
B) Rutherford
C) Bohr
D) Chadwick
Answer:<\/strong> A) J.J. Thomson
Explanation:<\/strong> Thomson proposed that electrons were embedded in a positive sphere like plums in pudding.<\/p>\n\n\n\n

14. The Rutherford model of the atom is also known as<\/mark><\/strong>
A) Nuclear model
B) Planetary model
C) Quantum model
D) Plum model
Answer:<\/strong> B) Planetary model
Explanation:<\/strong> In this model, electrons revolve around the nucleus like planets around the sun.<\/p>\n\n\n\n

15. The Bohr model of atom explained<\/mark><\/strong>
A) The stability of atom
B) Only mass
C) Magnetic properties
D) Nuclear reactions
Answer:<\/strong> A) The stability of atom
Explanation:<\/strong> Bohr introduced energy levels for electrons to explain stability.<\/p>\n\n\n\n

16. The modern model of atom is based on<\/mark><\/strong>
A) Quantum theory
B) Classical mechanics
C) Newton\u2019s laws
D) Magnetism
Answer:<\/strong> A) Quantum theory<\/p>\n\n\n\n

17. The nucleus of hydrogen atom consists of<\/mark><\/strong>
A) One proton
B) One neutron
C) One electron
D) One proton and one neutron
Answer:<\/strong> A) One proton<\/p>\n\n\n\n

18. The nucleus was discovered by<\/mark><\/strong>
A) Rutherford
B) Bohr
C) Thomson
D) Dalton
Answer:<\/strong> A) Rutherford<\/p>\n\n\n\n

19. The neutron was discovered by<\/mark><\/strong>
A) James Chadwick
B) Rutherford
C) Bohr
D) Thomson
Answer:<\/strong> A) James Chadwick<\/p>\n\n\n\n

20. The electron was discovered by<\/mark><\/strong>
A) J.J. Thomson
B) Rutherford
C) Bohr
D) Dalton
Answer:<\/strong> A) J.J. Thomson<\/p>\n\n\n\n

21. The number of protons in an atom is called<\/mark><\/strong>
A) Atomic number
B) Mass number
C) Isotope number
D) Neutron number
Answer:<\/strong> A) Atomic number<\/p>\n\n\n\n

22. The sum of protons and neutrons in an atom is called<\/mark><\/strong>
A) Mass number
B) Atomic number
C) Isotope
D) Atomic weight
Answer:<\/strong> A) Mass number<\/p>\n\n\n\n

23. Atoms of the same element with different number of neutrons are called<\/mark><\/strong>
A) Isotopes
B) Isobars
C) Isotones
D) Molecules
Answer:<\/strong> A) Isotopes<\/p>\n\n\n\n

24. Isotopes have same<\/mark><\/strong>
A) Atomic number
B) Mass number
C) Neutron number
D) Density
Answer:<\/strong> A) Atomic number<\/p>\n\n\n\n

25. Isobars have same<\/mark><\/strong>
A) Mass number
B) Atomic number
C) Number of neutrons
D) Electrons
Answer:<\/strong> A) Mass number<\/p>\n\n\n\n

26. The radioactive element used in cancer treatment is<\/mark><\/strong>
A) Cobalt-60
B) Uranium-238
C) Carbon-14
D) Thorium
Answer:<\/strong> A) Cobalt-60<\/p>\n\n\n\n

27. The element used as nuclear fuel is<\/mark><\/strong>
A) Uranium
B) Carbon
C) Iron
D) Oxygen
Answer:<\/strong> A) Uranium<\/p>\n\n\n\n

28. The process by which an unstable nucleus emits radiation is called<\/mark><\/strong>
A) Radioactivity
B) Ionization
C) Fusion
D) Fission
Answer:<\/strong> A) Radioactivity<\/p>\n\n\n\n

29. The three types of radioactive emissions are<\/mark><\/strong>
A) Alpha, beta, and gamma rays
B) X-rays, UV, and infrared
C) Neutrons, electrons, photons
D) Heat, light, and sound
Answer:<\/strong> A) Alpha, beta, and gamma rays<\/p>\n\n\n\n

30. The most penetrating radiation among them is<\/mark><\/strong>
A) Gamma rays
B) Alpha rays
C) Beta rays
D) X-rays
Answer:<\/strong> A) Gamma rays<\/p>\n\n\n\n

31. Alpha particles are<\/mark><\/strong>
A) Helium nuclei
B) Electrons
C) Protons
D) Neutrons
Answer:<\/strong> A) Helium nuclei<\/p>\n\n\n\n

32. Beta particles are<\/mark><\/strong>
A) Fast-moving electrons
B) Protons
C) Photons
D) Neutrons
Answer:<\/strong> A) Fast-moving electrons<\/p>\n\n\n\n

33. Gamma rays are<\/mark><\/strong>
A) Electromagnetic waves
B) Charged particles
C) Alpha particles
D) Neutrons
Answer:<\/strong> A) Electromagnetic waves<\/p>\n\n\n\n

34. The most ionizing radiation is<\/mark><\/strong>
A) Alpha rays
B) Beta rays
C) Gamma rays
D) X-rays
Answer:<\/strong> A) Alpha rays<\/p>\n\n\n\n

35. Radioactivity was discovered by<\/mark><\/strong>
A) Henri Becquerel
B) Marie Curie
C) Rutherford
D) Bohr
Answer:<\/strong> A) Henri Becquerel<\/p>\n\n\n\n

36. The husband-wife scientists who studied radioactivity were<\/mark><\/strong>
A) Pierre and Marie Curie
B) Bohr and Rutherford
C) Thomson and Chadwick
D) Newton and Faraday
Answer:<\/strong> A) Pierre and Marie Curie<\/p>\n\n\n\n

37. The unit of radioactivity is<\/mark><\/strong>
A) Becquerel
B) Joule
C) Ampere
D) Volt
Answer:<\/strong> A) Becquerel<\/p>\n\n\n\n

38. The old unit of radioactivity is<\/mark><\/strong>
A) Curie
B) Joule
C) Weber
D) Tesla
Answer:<\/strong> A) Curie<\/p>\n\n\n\n

39. The process of splitting a heavy nucleus into two lighter nuclei is called<\/mark><\/strong>
A) Nuclear fission
B) Nuclear fusion
C) Ionization
D) Radiation
Answer:<\/strong> A) Nuclear fission<\/p>\n\n\n\n

40. The process of combining two light nuclei to form a heavier nucleus is<\/mark><\/strong>
A) Nuclear fusion
B) Nuclear fission
C) Ionization
D) Radioactivity
Answer:<\/strong> A) Nuclear fusion<\/p>\n\n\n\n

41. Nuclear fission was discovered by<\/mark><\/strong>
A) Otto Hahn and Strassmann
B) Marie Curie
C) Rutherford
D) Bohr
Answer:<\/strong> A) Otto Hahn and Strassmann<\/p>\n\n\n\n

42. Nuclear fusion occurs in<\/mark><\/strong>
A)<\/strong> Sun and stars
B)<\/strong> Atomic reactors
C)<\/strong> Earth\u2019s core
D)<\/strong> Electric bulbs
Answer:<\/strong> A) Sun and stars<\/p>\n\n\n\n

43. The energy released in the sun is due to<\/mark><\/strong>
A) Nuclear fusion
B) Nuclear fission
C) Chemical reaction
D) Combustion
Answer:<\/strong> A) Nuclear fusion<\/p>\n\n\n\n

44. The first artificial nuclear reaction was performed by<\/mark><\/strong>
A) Rutherford
B) Bohr
C) Thomson
D) Curie
Answer:<\/strong> A) Rutherford<\/p>\n\n\n\n

45. The first controlled nuclear chain reaction was carried out by<\/mark><\/strong>
A) Enrico Fermi
B) Einstein
C) Marie Curie
D) Bohr
Answer:<\/strong> A) Enrico Fermi<\/p>\n\n\n\n

46. The device used to control nuclear reaction is<\/mark><\/strong>
A) Nuclear reactor
B) Generator
C) Transformer
D) Motor
Answer:<\/strong> A) Nuclear reactor<\/p>\n\n\n\n

47. The main part of a nuclear reactor that slows down neutrons is<\/mark><\/strong>
A) Moderator
B) Control rod
C) Fuel rod
D) Shield
Answer:<\/strong> A) Moderator<\/p>\n\n\n\n

48. The rods used to control the rate of nuclear reaction are made of<\/mark><\/strong>
A) Cadmium or boron
B) Iron
C) Copper
D) Lead
Answer:<\/strong> A) Cadmium or boron<\/p>\n\n\n\n

49. The energy produced by a nuclear reaction is called<\/mark><\/strong>
A) Nuclear energy
B) Chemical energy
C) Thermal energy
D) Solar energy
Answer:<\/strong> A) Nuclear energy<\/p>\n\n\n\n

50. The main nuclear fuel used in reactors is<\/mark><\/strong>
A) Uranium-235
B) Carbon-14
C) Lead-210
D) Sodium-24
Answer:<\/strong> A) Uranium-235<\/p>\n\n\n\n

51. The main function of a moderator in a nuclear reactor is to<\/mark><\/strong>
A) Slow down neutrons
B) Absorb neutrons
C) Produce heat
D) Reflect radiation
Answer:<\/strong> A) Slow down neutrons
Explanation:<\/strong> Slow neutrons are more effective in sustaining nuclear fission.

52. The material used as a moderator in reactors is<\/mark><\/strong>
A) Graphite or heavy water
B) Steel
C) Aluminium
D) Lead
Answer:<\/strong> A) Graphite or heavy water<\/p>\n\n\n\n

53. The rods that absorb extra neutrons in a reactor are called<\/mark><\/strong>
A) Control rods
B) Fuel rods
C) Absorbers
D) Reflectors
Answer:<\/strong> A) Control rods<\/p>\n\n\n\n

54. The heavy water used in reactors is<\/mark><\/strong>
A) Water containing heavy hydrogen (deuterium)
B) Salty water
C) Acidic water
D) Pure distilled water
Answer:<\/strong> A) Water containing heavy hydrogen (deuterium)<\/p>\n\n\n\n

55. The nuclear reactor used for generating electricity is called<\/mark><\/strong>
A) Atomic power reactor
B) Solar reactor
C) Thermal reactor
D) Fusion reactor
Answer:<\/strong> A) Atomic power reactor<\/p>\n\n\n\n

56. The first nuclear reactor was built by<\/mark><\/strong>
A) Enrico Fermi
B) Rutherford
C) Curie
D) Einstein
Answer:<\/strong> A) Enrico Fermi<\/p>\n\n\n\n

57. The first nuclear reactor was built in<\/mark><\/strong>
A) Chicago (USA)
B) Paris
C) London
D) Moscow
Answer:<\/strong> A) Chicago (USA)<\/p>\n\n\n\n

58. The first nuclear power plant in India is located at<\/mark><\/strong>
A) Tarapur (Maharashtra)
B) Kalpakkam (Tamil Nadu)
C) Kaiga (Karnataka)
D) Kota (Rajasthan)
Answer:<\/strong> A) Tarapur (Maharashtra)<\/p>\n\n\n\n

59. The main by-product of nuclear fission is<\/mark><\/strong>
A) Heat energy
B) Light energy
C) Sound energy
D) Pressure
Answer:<\/strong> A) Heat energy<\/p>\n\n\n\n

60. The energy released in nuclear fission is due to<\/mark><\/strong>
A) Conversion of mass into energy
B) Chemical reaction
C) Combustion
D) Ionization
Answer:<\/strong> A) Conversion of mass into energy<\/p>\n\n\n\n

61. Nuclear fusion requires<\/mark><\/strong>
A) Very high temperature and pressure
B) Low temperature
C) Room temperature
D) Magnetic field only
Answer:<\/strong> A) Very high temperature and pressure<\/p>\n\n\n\n

62. The hydrogen bomb is based on<\/mark><\/strong>
A) Nuclear fusion
B) Nuclear fission
C) Radioactivity
D) Ionization
Answer:<\/strong> A) Nuclear fusion<\/p>\n\n\n\n

63. The atom bomb is based on<\/mark><\/strong>
A) Nuclear fission
B) Nuclear fusion
C) Chemical explosion
D) Electric discharge
Answer:<\/strong> A) Nuclear fission<\/p>\n\n\n\n

64. The radioactive isotope used in carbon dating is<\/mark><\/strong>
A) Carbon-14
B) Uranium-235
C) Thorium-232
D) Cobalt-60
Answer:<\/strong> A) Carbon-14
Explanation:<\/strong> Carbon-14 helps determine the age of fossils and ancient materials.<\/p>\n\n\n\n

65. The half-life of a radioactive element is the time taken for<\/mark><\/strong>
A) Half of the nuclei to decay
B) All nuclei to decay
C) Double decay
D) Ionization
Answer:<\/strong> A) Half of the nuclei to decay<\/p>\n\n\n\n

66. The half-life of Carbon-14 is approximately<\/mark><\/strong>
A) 5730 years
B) 50 years
C) 100 years
D) 1 year
Answer:<\/strong> A) 5730 years<\/p>\n\n\n\n

67. The radiation used to kill cancer cells is<\/mark><\/strong>
A) Gamma rays
B) Alpha rays
C) Beta rays
D) X-rays
Answer:<\/strong> A) Gamma rays<\/p>\n\n\n\n

68. The isotope used in radiocarbon dating is<\/mark><\/strong>
A) Carbon-14
B) Nitrogen-14
C) Oxygen-16
D) Hydrogen-1
Answer:<\/strong> A) Carbon-14<\/p>\n\n\n\n

69. The isotope used in medical diagnosis is<\/mark><\/strong>
A) Iodine-131
B) Uranium-238
C) Carbon-12
D) Sodium-23
Answer:<\/strong> A) Iodine-131
Explanation:<\/strong> It is used to check thyroid gland function.<\/p>\n\n\n\n

70. The isotope used in detecting blood circulation is<\/mark><\/strong>
A) Sodium-24
B) Iodine-131
C) Uranium-235
D) Carbon-14
Answer:<\/strong> A) Sodium-24<\/p>\n\n\n\n

71. The isotope used in detecting leaks in gas pipelines is<\/mark><\/strong>
A) Argon-41
B) Carbon-12
C) Oxygen-18
D) Hydrogen-1
Answer:<\/strong> A) Argon-41<\/p>\n\n\n\n

72. The isotope used in agriculture to study plant metabolism is<\/mark><\/strong>
A) Phosphorus-32
B) Carbon-14
C) Iodine-131
D) Uranium-238
Answer:<\/strong> A) Phosphorus-32<\/p>\n\n\n\n

73. The radiation which can be stopped by a sheet of paper is<\/mark><\/strong>
A) Alpha radiation
B) Beta radiation
C) Gamma radiation
D) X-rays
Answer:<\/strong> A) Alpha radiation<\/p>\n\n\n\n

74. The radiation that can penetrate lead sheets partially is<\/mark><\/strong>
A) Gamma rays
B) Beta rays
C) Alpha rays
D) Ultraviolet rays
Answer:<\/strong> A) Gamma rays<\/p>\n\n\n\n

75. The Geiger-Muller counter is used to detect<\/mark><\/strong>
A) Radiation
B) Current
C) Voltage
D) Magnetic field
Answer:<\/strong> A) Radiation<\/p>\n\n\n\n

76. The radioactive decay process continues until<\/mark><\/strong>
A) A stable nucleus is formed
B) The element disappears
C) Energy is lost
D) It becomes heavy
Answer:<\/strong> A) A stable nucleus is formed<\/p>\n\n\n\n

77. Nuclear fusion produces<\/mark><\/strong>
A) More energy than fission
B) Less energy than fission
C) Equal energy
D) No energy
Answer:<\/strong> A) More energy than fission<\/p>\n\n\n\n

78. The energy from the sun is due to<\/mark><\/strong>
A) Fusion of hydrogen atoms
B) Fission of uranium
C) Burning gases
D) Chemical reactions
Answer:<\/strong> A) Fusion of hydrogen atoms<\/p>\n\n\n\n

79. The hydrogen atoms combine in the sun to form<\/mark><\/strong>
A) Helium
B) Oxygen
C) Carbon
D) Nitrogen
Answer:<\/strong> A) Helium<\/p>\n\n\n\n

80. The radiation that can pass through the human body easily is<\/mark><\/strong>
A) Gamma rays
B) Alpha rays
C) Beta rays
D) Light rays
Answer:<\/strong> A) Gamma rays<\/p>\n\n\n\n

81. X-rays were discovered by<\/mark><\/strong>
A) Wilhelm Roentgen
B) Becquerel
C) Curie
D) Rutherford
Answer:<\/strong> A) Wilhelm Roentgen<\/p>\n\n\n\n

82. X-rays are used in<\/mark><\/strong>
A) Medical imaging and security scanning
B) Food preparation
C) Communication
D) Painting
Answer:<\/strong> A) Medical imaging and security scanning<\/p>\n\n\n\n

83. The nucleus of an atom is held together by<\/mark><\/strong>
A) Strong nuclear force
B) Gravitational force
C) Electrostatic force
D) Friction
Answer:<\/strong> A) Strong nuclear force<\/p>\n\n\n\n

84. The strong nuclear force is effective over<\/mark><\/strong>
A) Very short distances
B) Long distances
C) Infinite distances
D) Medium distances
Answer:<\/strong> A) Very short distances<\/p>\n\n\n\n

85. The energy obtained from atomic nuclei is called<\/mark><\/strong>
A) Nuclear energy
B) Thermal energy
C) Mechanical energy
D) Solar energy
Answer:<\/strong> A) Nuclear energy<\/p>\n\n\n\n

86. Nuclear energy is used in<\/mark><\/strong>
A) Power generation and medical treatments
B) Agriculture only
C) Cooking
D) Transportation
Answer:<\/strong> A) Power generation and medical treatments<\/p>\n\n\n\n

87. The harmful effect of nuclear radiation on living cells is<\/mark><\/strong>
A) Genetic mutation and cell damage
B) Better growth
C) Cooling
D) Strength increase
Answer:<\/strong> A) Genetic mutation and cell damage<\/p>\n\n\n\n

88. The most dangerous radiation for living cells is<\/mark><\/strong>
A) Gamma rays
B) Beta rays
C) Alpha rays
D) Visible light
Answer:<\/strong> A) Gamma rays<\/p>\n\n\n\n

89. The radioactive element used in luminous paints is<\/mark><\/strong>
A) Radium
B) Uranium
C) Carbon
D) Sodium
Answer:<\/strong> A) Radium<\/p>\n\n\n\n

90. The device used to measure exposure to radiation is<\/mark><\/strong>
A) Dosimeter
B) Thermometer
C) Voltmeter
D) Barometer
Answer:<\/strong> A) Dosimeter<\/p>\n\n\n\n

91. Radioactive wastes are disposed of by<\/mark><\/strong>
A) Burying them deep underground
B) Releasing into rivers
C) Burning
D) Exposing to sunlight
Answer:<\/strong> A) Burying them deep underground<\/p>\n\n\n\n

92. The radiation that causes the highest ionization in air is<\/mark><\/strong>
A) Alpha radiation
B) Beta radiation
C) Gamma radiation
D) X-rays
Answer:<\/strong> A) Alpha radiation<\/p>\n\n\n\n

93. The nuclear reactor that produces more fuel than it consumes is<\/mark><\/strong>
A) Breeder reactor
B) Fusion reactor
C) Thermal reactor
D) Fast reactor
Answer:<\/strong> A) Breeder reactor<\/p>\n\n\n\n

94. The reactor that uses fast neutrons is<\/mark><\/strong>
A) Fast breeder reactor
B) Slow reactor
C) Fusion reactor
D) Pressurized reactor
Answer:<\/strong> A) Fast breeder reactor<\/p>\n\n\n\n

95. The isotope used as a fuel in fast breeder reactors is<\/mark><\/strong>
A) Plutonium-239
B) Uranium-238
C) Carbon-14
D) Sodium-24
Answer:<\/strong> A) Plutonium-239<\/p>\n\n\n\n

96. The radioactive element found naturally in pitchblende ore is<\/mark><\/strong>
A) Uranium
B) Carbon
C) Sodium
D) Cobalt
Answer:<\/strong> A) Uranium<\/p>\n\n\n\n

97. The unit used to measure the biological effect of radiation is<\/mark><\/strong>
A) Sievert
B) Volt
C) Ohm
D) Watt
Answer:<\/strong> A) Sievert<\/p>\n\n\n\n

98. The country where the first atomic bomb was dropped is<\/mark><\/strong>
A) Japan
B) Germany
C) USA
D) Russia
Answer:<\/strong> A) Japan
Explanation:<\/strong> The bombs were dropped on Hiroshima and Nagasaki in 1945.<\/p>\n\n\n\n

99. The scientist who proposed the relation between mass and energy was<\/mark><\/strong>
A) Albert Einstein
B) Rutherford
C) Bohr
D) Curie
Answer:<\/strong> A) Albert Einstein<\/p>\n\n\n\n

100. The peaceful use of atomic energy is in<\/mark><\/strong>
A) Power generation, medicine, and research
B) Weapon making only
C) Food heating
D) Magnetic devices
Answer:<\/strong> A) Power generation, medicine, and research<\/p>\n","protected":false},"excerpt":{"rendered":"

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