MCQOPTIONS
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MCQOPTIONS
This section includes 60 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
?-particle ionizes an atom |
| A. | Due to electrostatic force of attraction |
| B. | Due to electrostatic force of repulsion |
| C. | Due to direct collision |
| D. | Due to gravitational force |
| Answer» C. Due to direct collision | |
| 2. |
?-particles possess greater penetration power than that of ?-particles due to its |
| A. | Smaller ionization power |
| B. | Greater ionization power |
| C. | Neither greater nor smaller ionization power |
| D. | Same ionization power |
| Answer» B. Greater ionization power | |
| 3. |
?-rays are electromagnetic waves like |
| A. | Light waves |
| B. | Heat waves |
| C. | Micro waves |
| D. | X-rays |
| Answer» E. | |
| 4. |
A ?-particle in a single encounter |
| A. | Loses a small fraction of its energy |
| B. | Losses most of its energy |
| C. | Loses no energy at all |
| D. | Loses all of its energy |
| Answer» C. Loses no energy at all | |
| 5. |
A ?-particle can produce fluorescence in |
| A. | ZnS |
| B. | Barium platinocyanide |
| C. | Calcium tungstate |
| D. | All of above |
| Answer» E. | |
| 6. |
In liquid metal fast breeder reactor the type of uranium used is |
| A. | 92U235 |
| B. | 92U238 |
| C. | 92U234 |
| D. | 92U239 |
| Answer» C. 92U234 | |
| 7. |
A device for producing high velocity nuclei is |
| A. | Cloud chamber |
| B. | Linear accelerator |
| C. | A mass spectrograph |
| D. | Wilson cloud chamber |
| Answer» C. A mass spectrograph | |
| 8. |
In nucleus of uranium the number of neutrons will be |
| A. | 92 |
| B. | 235 |
| C. | 143 |
| D. | Different for different isotopes |
| Answer» E. | |
| 9. |
Mass defect per nucleon is |
| A. | Binding energy of nucleus |
| B. | Packing fraction |
| C. | Average energy of nucleus |
| D. | All of above are one and same thing |
| Answer» C. Average energy of nucleus | |
| 10. |
Mass of neutron is |
| A. | 1.67 x 10-31 kg |
| B. | 1.67 x 10-27 kg |
| C. | 9.1 x 10-31 kg |
| D. | 1.67 x 10-19 kg |
| Answer» C. 9.1 x 10-31 kg | |
| 11. |
Neutron and proton are commonly known as |
| A. | Nucleon |
| B. | Meson |
| C. | Boson |
| D. | Quartz |
| Answer» B. Meson | |
| 12. |
Nuclear forces exist between |
| A. | Proton-proton |
| B. | Proton-neutron |
| C. | Neutron-neutron |
| D. | All of the above |
| Answer» E. | |
| 13. |
Nuclei having the same mass number but different atomic number are |
| A. | Isotopes |
| B. | Isobars |
| C. | Isotones |
| D. | Isomers |
| Answer» C. Isotones | |
| 14. |
Pair production can take place only with |
| A. | X-rays |
| B. | ?-rays |
| C. | UV-rays |
| D. | IR-rays |
| Answer» C. UV-rays | |
| 15. |
Pair production cannot take place in vacuum as |
| A. | Mass is not conserved |
| B. | Energy is not conserved |
| C. | Momentum is not conserved |
| D. | Charge is not conserved |
| Answer» D. Charge is not conserved | |
| 16. |
Pair production takes place in the vicinity of a heavy nucleus so that |
| A. | Net energy is conserved |
| B. | Net charge is conserved |
| C. | Net momentum is conserved |
| D. | All of the above |
| Answer» E. | |
| 17. |
Pair production cannot take place in vacuum as ________ is not conserved |
| A. | Energy |
| B. | Charge |
| C. | Mass |
| D. | Momentum |
| Answer» E. | |
| 18. |
Radiations are used for the treatment of skin of a patient is |
| A. | ?-rays |
| B. | ?-rays |
| C. | ?-rays |
| D. | X-rays |
| Answer» C. ?-rays | |
| 19. |
Radioactive decay obeys which one of the following law? |
| A. | N=N?e-?t |
| B. | N=N?e?t |
| C. | N=N?e-?t/2 |
| D. | N?=N(1+e?t) |
| Answer» B. N=N?e?t | |
| 20. |
Charge on ?-particle is |
| A. | 1 |
| B. | -1 |
| C. | Plus two |
| D. | -2 |
| Answer» B. -1 | |
| 21. |
Charge on ?-particles is |
| A. | Plus one |
| B. | Plus two |
| C. | Minus two |
| D. | Minus one |
| Answer» C. Minus two | |
| 22. |
Charge on an electron was determine by |
| A. | Ampere |
| B. | Maxwell |
| C. | Millikan |
| D. | Thomson |
| Answer» D. Thomson | |
| 23. |
Charge on neutron is |
| A. | Plus 1.6 x 10-19C |
| B. | Zero |
| C. | Minus 1.6 x 10-19C |
| D. | No definite charge |
| Answer» C. Minus 1.6 x 10-19C | |
| 24. |
Diameter of an atom is approximately |
| A. | 10-12m |
| B. | 10-11m |
| C. | 10-10m |
| D. | 10-14m |
| Answer» D. 10-14m | |
| 25. |
During an encounter with an atom ?-particle knocks out |
| A. | Protons |
| B. | Electrons |
| C. | Neutrons |
| D. | Nothing |
| Answer» C. Neutrons | |
| 26. |
During fission process a large amount of |
| A. | Heat energy is released |
| B. | Nuclear energy is released |
| C. | Chemical energy is released |
| D. | Light energy is released |
| Answer» C. Chemical energy is released | |
| 27. |
During fusion of hydrogen into helium |
| A. | Energy is absorbed |
| B. | Energy is released |
| C. | Mass is increased due to energy absorption |
| D. | Mass is reduced due to energy released |
| Answer» C. Mass is increased due to energy absorption | |
| 28. |
Electrons |
| A. | Can exist inside the nucleus |
| B. | Cannot exist inside the nucleus |
| C. | Can exist both inside and outside the nucleus |
| D. | Do not know |
| Answer» C. Can exist both inside and outside the nucleus | |
| 29. |
Fission chain reaction in a nuclear reactor can be controlled by introducing |
| A. | Iron rods |
| B. | Graphite rods |
| C. | Cadmium rods |
| D. | Platinum rods |
| Answer» D. Platinum rods | |
| 30. |
Energy liberated when one atom of U-235 undergoes fission reaction is |
| A. | 200MeV |
| B. | 40MeV |
| C. | 30MeV |
| D. | 20MeV |
| Answer» B. 40MeV | |
| 31. |
For chain reaction to build up the size of the radioactive target should be |
| A. | Greater than the critical size |
| B. | Less than the critical size |
| C. | Equal to the critical size |
| D. | All of above can build up a change reaction |
| Answer» B. Less than the critical size | |
| 32. |
Geiger counter is suitable for |
| A. | Fast counting |
| B. | Extremely fast counting |
| C. | Slow counting |
| D. | All situations |
| Answer» D. All situations | |
| 33. |
Half life of radium is 1590 years. In how many years shall the earth loss all its radium due to radioactive decay? |
| A. | 1590x106 years |
| B. | 1590x1012 years |
| C. | 1590x1024 years |
| D. | Never |
| Answer» E. | |
| 34. |
If one or more of the neutrons emitted during fission cab be used to build up further fission then the reaction is self sustained and is known as |
| A. | Fission reaction |
| B. | Fusion reaction |
| C. | Chain reaction |
| D. | Chemical reaction |
| Answer» D. Chemical reaction | |
| 35. |
Radioactive materials can be identified by measuring their |
| A. | Hardness |
| B. | Density |
| C. | Mass |
| D. | Half life |
| Answer» E. | |
| 36. |
A mass spectrograph (spectrometer) sorts out |
| A. | Molecules |
| B. | Ions |
| C. | Elements |
| D. | Isotopes |
| Answer» C. Elements | |
| 37. |
A particle having the mass of an electron and the charge of a proton is called a |
| A. | Antiproton |
| B. | Positron |
| C. | Gamma rays |
| D. | Photon |
| Answer» C. Gamma rays | |
| 38. |
Antimatter consists of |
| A. | Antiproton |
| B. | Antineutron |
| C. | Positron |
| D. | All of above |
| Answer» E. | |
| 39. |
According to which one of following law the density of atom is uniform? |
| A. | J.J.Thomson model |
| B. | Rutherfords model |
| C. | Bohrs model |
| D. | All of above laws contradict the statement |
| Answer» B. Rutherfords model | |
| 40. |
An ?-particle is emitted from 88Ra226. What is the mass and atomic number of the daughter nucleus? |
| A. | 224 - 84 |
| B. | 220 - 80 |
| C. | 222 - 86 |
| D. | 226 - 87 |
| Answer» D. 226 - 87 | |
| 41. |
Average distance covered by ?-particle in air before its ionizing power ceases is called its |
| A. | Trajectory |
| B. | Range |
| C. | Firing level |
| D. | Limit |
| Answer» C. Firing level | |
| 42. |
Average energy required to remove one nucleon from the nucleus is called |
| A. | Binding energy per nucleon |
| B. | Energy of decay |
| C. | Destruction energy |
| D. | All of above |
| Answer» B. Energy of decay | |
| 43. |
CFC is used in |
| A. | Refrigeration |
| B. | Aerosol spray |
| C. | Plastic foam industry |
| D. | All of above |
| Answer» E. | |
| 44. |
Which of the following will be a better shield against ?-rays? |
| A. | Ordinary water |
| B. | Heavy water |
| C. | Lead |
| D. | Aluminum |
| Answer» D. Aluminum | |
| 45. |
Which one of the following radiation possesses maximum penetrating power? |
| A. | ?-rays |
| B. | ?-rays |
| C. | ?-rays |
| D. | All have equal penetrating power |
| Answer» D. All have equal penetrating power | |
| 46. |
Which one of the following radiations possesses maximum velocity? |
| A. | ?-rays |
| B. | ?-rays |
| C. | ?-rays |
| D. | All of above have same speed |
| Answer» D. All of above have same speed | |
| 47. |
Why ?-rays are used to kill bacteria to sterilize surgical equipments etc? |
| A. | Chargeless |
| B. | Massless |
| C. | Highly penetrating |
| D. | All of above |
| Answer» D. All of above | |
| 48. |
Radioactivity is a ______ (A) Spontaneous activity (B) Chemical property (C) Physical Property |
| A. | A & B |
| B. | B & C |
| C. | C & A |
| D. | A B & C |
| Answer» D. A B & C | |
| 49. |
Sterilization of surgical instruments medical supplies and bandages can be done by exposing them to a beam of |
| A. | ?-rays |
| B. | ?-rays |
| C. | ?-rays |
| D. | B and c have equal antiseptic properties |
| Answer» D. B and c have equal antiseptic properties | |
| 50. |
Strontium-90 is used as |
| A. | ?-particle source |
| B. | ?-particle source |
| C. | ?-rays source |
| D. | Neutron source |
| Answer» B. ?-particle source | |