CH-21 Nuclear Physics Leave a Comment / By abdulslambsn@gmail.com / October 6, 2025 Welcome To Your Quiz "CH-21 Nuclear Physics" Click on "Start Quiz" To Continue... 1. The electron was discovered by J.J Thomson by passing an electric discharge through: A liquid A solid A gas at low pressure A gas at high pressure None 2. Chadwick discovered neutron by the study of scattering of a -particles from: Nitrogen Oxygen Gold foil Beryllium None 3. In the unit of unified mass scale, The mass of an electron is: 0.000554 u 0.0000554 u 1,007276 u 1.0086654 u None 4. Isotopes of hydrogen are: Protium Deutrium Tritium All of these None 5. The energy required to breaks up helium nuclear into two protons and two neutron is: 28.2 eV 28.2 KeV 28.2 Mev 28.2 uev None 6. A particle having the mass of electron and the charge of proton is called a: Photon Nucleons Positron Antiproton None 7. Atoms of an element whose atomic number are the same but have different mass numbers are called: Isomers Isotones Isotopes None of these None 8. For an atom having atomic mass A and atomic number Z, the number of neutrons in the nucleus is: A + Z A-Z Z None of these None 9. The amount of energy required to break the nucleus is called its: Binding energy Potential and kinetic energy Atomic energy Neuclear energy None 10. The binding energy of deutron is: 22.22 Mev 2.224 Mev 0.224 Mev 20.2 Mev None 11. When a nucleus emits an a- particle, its mass number drops by: 1 3 2 4 None 12. Marie curie and pierre curie discovered two new radioactive elements which are: Polonium and radium Radium and crypton Platinum and radium Uranium and Radium None 13. The distance at which the radioactive particle comes to rest after emitting from a source is called: Stopping distance Range Distancce All of the above None 14. Which one of the following is not affected by electric or magnetic field: Proton Electrons y-rays x-rays None 15. The time taken for a radioactive element to decay to half of its original number of atoms is called: Half life of the material Decay life of the material Average life of material None of these None 16. If we have No number of atoms of any radioactive element, then after 4 half life's, the number of atoms left behind are: 1/16 No 1/4 No 1/8 No None of these None 17. When a certain radiation passes through matters it lose energy due to: Ionization of material atoms due to direct collision Ionization of material atoms due to electrostatic attraction Excitation of material atoms Any of these None 18. The process in which a heavy nucleus is broken into two lighter nuclei with the release of energy is called: Nuclear fusion Nuclear fission Chain reaction None of these None 19. The product of the fission reaction of uranium name barium and crypton have a total mass equal to: 1.96 Mev 0.67 Mev 0.9 Mev 0.97 Mev None 20. The total energy transferred to a body by means of radiation is measured is units of: Rontegns Rutherford's Curies None of these None 21. The process in which two or more lighter nuclei combine together to form heavier nuclei with release of energy is called: Nuclear fission Nuclear fusion Chain reaction None of these None 22. The substances which slow down the speed of neutron produced during a fission reaction are called: Moderators Retardants Both A and B None of these None 23. Certain radiation detector makes use of the fact that super saturated vapors condense preferentially on ions this type of detector is called: Gorger counter Wilson cloud chamber Solid state detector None of these None 24. In G.M, counter, the cylinder is dilled with a mixture of gasses: Containing Ne and Br Containing organ and alcohol Both A and B None of these None 25. In solid state detector, the reverse bias is applied through the two: Conducting layers of silver Conducting layers of gold Conducting layers of aluminum Conducting layers of plastic None 26. The Wilson Cloud chamber is based on the principal that supper saturated vapors condense more readily on: Ions and dust particles Dust particles Ions None of these None 27. Wilson Cloud chamber is a device used as: Path of ionizing particle Accelerating +vely charged particle Accelerating -vely charged particle None of these None 28. Geiger Muller counter is suitable for: Slow counting Fast counting Both A and B None of these None 29. The potential difference between the top and bottom of a cloud chamber is of the order of: 290 v 400 v 1 kv None of above None 30. Which one of the following detectors can occur fast and operate at low voltage: Solid state detector G.M counter Wilson Cloud Chamber None of these None 31. The capture of a neutron by a nucleus results in the formation of: Deutron Proton Helium Radio Isotope None 32. The total energy transferred to a body by means of radiation is measured in units of: Becquerels Grey Rem Roentgen None 33. The number of fundamental forces present in nature are: 3 2 5 4 None 34. During fusion of hydrogen into helium: Energy is released Energy is absorbed Mass is increased due to energy absorption Mass is reduced due to energy released None 35. The mass spectrum of naturally occurring neon, showing: 1 isotope 2 isotope 3 isotope 4 isotope None 36. The energy of photon for photoelectric effect is less than: 1 MeV 2 MeV 5 MeV 8 MeV None 37. Low level radiation effects: Less of hair Ulceration Drop white blood cells All of these None 38. In Wilson cloud chamber, if tracks are thick, straight and continuous, then particle is: a-particles b-particles y-particles All of these None 39. A pair of quark and anti quark makes a: Meson Bargon Photon Proton None 40. The SI unit of radiation dose is: Roentgen Curie Grey Rem None 1 out of 8 Thanks For Taking This Quiz - Please See Your Answers/Results Below After Entering Your Name & Email... Name Email Time's up
