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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 | |