MCQOPTIONS
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MCQOPTIONS
This section includes 145 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The ratio of atomic volume to nuclear volume is of the order of |
| A. | 10 |
| B. | 10 |
| C. | 10 |
| D. | 10 |
| Answer» B. 10 | |
| 2. |
The mass density of a nucleus varies with the mass number A as |
| A. | A |
| B. | A |
| C. | 1 / A |
| D. | A |
| Answer» E. | |
| 3. |
Which of the following statements are true ?I . All radioactive elements decay exponentially with timeII . Half-life time of radioactive element is the time required for one half of the radioactive atoms to disintegrate III . Age of the earth can be determined by radioactive dating IV . Half-life time of a radioactive element is fifty percent of its average life period.Select the correct answer using the codes given below |
| A. | I and II |
| B. | I, III and IV |
| C. | I, II and III |
| D. | II and III |
| Answer» D. II and III | |
| 4. |
Which of the following nuclei undergo fission when struck by thermal neutrons ?1. U2352. U2383. Pu239Select the correct answer using the codes given below |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1 and 3 only |
| D. | 1, 2 and 3 |
| Answer» D. 1, 2 and 3 | |
| 5. |
X210 has half life of 5 days. The time taken for seven-eights of sample of X210 to decay is |
| A. | 15 days |
| B. | 20 days |
| C. | 10 days |
| D. | none |
| Answer» B. 20 days | |
| 6. |
The number of atoms of a radioactive substance at t = 0 is 8 x 104. Its half-life period is 4 years. The number of atoms left undecayed will be 1 x 104 after an interval of |
| A. | 9 years |
| B. | 12 years |
| C. | 16 years |
| D. | none |
| Answer» C. 16 years | |
| 7. |
Consider the following statements in a nuclear reactor, self sustained chain reaction is possible, because1. More neutrons are related in each of the fission reaction2. The neutrons immediately take part in the fission process3. The fast neutrons are slowed down by graphite4. Every neutron released in the fission reaction initiates fission.Which of these statements are correct ? |
| A. | 1, 2 and 3 |
| B. | 1 and 3 |
| C. | 2 and 4 |
| D. | 2, 3 and 4 |
| Answer» B. 1 and 3 | |
| 8. |
Consider the following statements 1. Atom bomb is based upon the principle of uncontrolled nuclear fusion2. Hydrogen bomb is based upon the principle of uncontrolled nuclear fission 3. Nuclear reactor is based upon the principle of controlled nuclear fissionWhich of the statements given above is / are correct ? |
| A. | 3 only |
| B. | 1 and 2 only |
| C. | 2 and 3 only |
| D. | 1, 2 and 3 |
| Answer» B. 1 and 2 only | |
| 9. |
Fertile material among the following is |
| A. | U |
| B. | Pu |
| C. | U |
| D. | U |
| Answer» E. | |
| 10. |
The nuclear 6C13 and 7N14 can be described as |
| A. | Isobars |
| B. | Isotone |
| C. | Isotopes of carbon |
| D. | None of these |
| Answer» C. Isotopes of carbon | |
| 11. |
Consider the following statements1. Plutonium - 239 can be made artificially2. Boron is used in a nuclear reactor to absorbs unwanted neutrons3. In nature, the availability of uranium - 238 is much more than that of uranium - 235. |
| A. | 1 only |
| B. | 1, 2 |
| C. | 1, 2, 3 |
| D. | 3 only |
| Answer» D. 3 only | |
| 12. |
In the following nuclear reaction6C11 5B11 + + + XWhat does X stand for ? |
| A. | A neutron |
| B. | A neutrino |
| C. | An electron |
| D. | A proton |
| Answer» C. An electron | |
| 13. |
Thermal neutrons can cause fission in |
| A. | U |
| B. | U |
| C. | Pu |
| D. | Th |
| Answer» B. U | |
| 14. |
Consider the following metals1. Uranium2. Radium3. PlutoniumWhich of these are used in making nuclear weapons ? |
| A. | 1 and 2 |
| B. | 1, 2 and 3 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» E. | |
| 15. |
12 / 6C absorbs an energetic neutron and emits a - particle.The resulting nucleus is |
| A. | N |
| B. | N |
| C. | B |
| D. | B |
| Answer» C. B | |
| 16. |
When 30 / 15 P decays to become 30 / 14 Si, the particle released is |
| A. | Electron |
| B. | a - particle |
| C. | Neutron |
| D. | Positron |
| Answer» E. | |
| 17. |
In the following nuclear reaction, 6 / 11 C 11 / 5 B + + X what does X stand for ? |
| A. | A proton |
| B. | A neutron |
| C. | A neutrino |
| D. | An electron |
| Answer» D. An electron | |
| 18. |
In any fission process. The ratio mass of fission products is mass of parent nucleus |
| A. | Greater than 1 |
| B. | Equal to 1 |
| C. | Less than 1 |
| D. | Depends on the mass of the parent nucleus |
| Answer» D. Depends on the mass of the parent nucleus | |
| 19. |
Consider the following statements 1. According to de Broglie hypothesis particle have wave - like characteristics2. When an electron and proton have the same de broglie wavelength, they will have equal momentumWhich of the statements given above is / are correct ? |
| A. | 1 only |
| B. | 2 only |
| C. | Both 1, 2 |
| D. | Neither 1 nor 2 |
| Answer» D. Neither 1 nor 2 | |
| 20. |
Enriched uranium is better as a fuel for a nuclear reactor because it has greater proportion of |
| A. | U |
| B. | U |
| C. | U |
| D. | U |
| Answer» C. U | |
| 21. |
Electron beam therapy is a kind of radiation therapy to treat |
| A. | enlarged prostate gland |
| B. | gall bladder stones |
| C. | certain types of cancer |
| D. | kidney stones |
| Answer» D. kidney stones | |
| 22. |
Light year is |
| A. | Light emitted by the sun in one year |
| B. | Time taken by light to travel from sun to earth |
| C. | The distance travelled by light in free space in one year |
| D. | Time taken by earth to go once around the sun |
| Answer» D. Time taken by earth to go once around the sun | |
| 23. |
Match List - I (particle) with List - II (approximate rest energy in MeV) and select the correct answer using the codes gives the listsList - I List - II F Electron 0K1.940G Neutrino2.140H Neutron3.0.5 J Pi-Mason4.0 Codes :F G H J A. 2413B. 3412C. 3142D. 2143 |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» C. C. | |
| 24. |
The number of electrons in an atom of atomic number Z and mass number A is |
| A. | Z |
| B. | A |
| C. | A - Z |
| D. | none |
| Answer» B. A | |
| 25. |
Einstein got noble prize for |
| A. | Photoelectric effect |
| B. | Compton effect |
| C. | Theory of relativity |
| D. | None of these |
| Answer» B. Compton effect | |
| 26. |
Solar energy is produced by the following reaction |
| A. | Fission reaction |
| B. | Fusion reaction |
| C. | Chemical reaction |
| D. | None of these |
| Answer» C. Chemical reaction | |
| 27. |
The special technique used in ships to calculate the depth of ocean beds is |
| A. | LASER |
| B. | SONAR |
| C. | sonic boom |
| D. | reverberation |
| Answer» C. sonic boom | |
| 28. |
A man is sitting in a boat which is floating in pond. If the man drinks some water from the pond, the level of water in the pond will |
| A. | rise a little |
| B. | fall a little |
| C. | remain stationary |
| D. | None of these |
| Answer» D. None of these | |
| 29. |
Among the following radiations, which has the highest energy ? |
| A. | Visible |
| B. | X - ray |
| C. | Ultraviolet |
| D. | Infrared |
| Answer» C. Ultraviolet | |
| 30. |
Astronauts in space can't stand at one place, because |
| A. | there is no gravity |
| B. | viscous forces of the atmosphere are vary strong |
| C. | solar wind exert an upward force |
| D. | atmospheric pressure is very low |
| Answer» B. viscous forces of the atmosphere are vary strong | |
| 31. |
An egg when placed in ordinary water sinks but floats when placed in brine. This is because |
| A. | density of brine is less than that of ordinary water |
| B. | density of brine is equal to that of ordinary water |
| C. | density of brine is greater than that of ordinary water |
| D. | None of these |
| Answer» D. None of these | |
| 32. |
A body traveling with a speed of more than the velocity of sound in air is said to travel with |
| A. | supersonic speed |
| B. | hypersonic speed |
| C. | ultrasonic speed |
| D. | infrasonic speed |
| Answer» B. hypersonic speed | |
| 33. |
Radioactivity was discovered by |
| A. | Rutherford |
| B. | Henry Becquerel |
| C. | Bohr |
| D. | Madame Curie |
| Answer» C. Bohr | |
| 34. |
Photoelectric effect was discovered by |
| A. | Hertz |
| B. | Einstein |
| C. | Plank |
| D. | Bohr |
| Answer» C. Plank | |
| 35. |
Solar energy |
| A. | Fission reaction |
| B. | Fusion reaction |
| C. | Chemical reaction |
| D. | None of these |
| Answer» C. Chemical reaction | |
| 36. |
Einstein |
| A. | Photoelectric effect |
| B. | Compton effect |
| C. | Theory of relativity |
| D. | None of these |
| Answer» B. Compton effect | |
| 37. |
Astronauts |
| A. | there is no gravity |
| B. | viscous forces of the atmosphere are vary strong |
| C. | solar wind exert an upward force |
| D. | atmospheric pressure is very low |
| Answer» B. viscous forces of the atmosphere are vary strong | |
| 38. |
An egg |
| A. | density of brine is less than that of ordinary water |
| B. | density of brine is equal to that of ordinary water |
| C. | density of brine is greater than that of ordinary water |
| D. | None of these |
| Answer» D. None of these | |
| 39. |
A man is sitting in a boat which is |
| A. | rise a little |
| B. | fall a little |
| C. | remain stationary |
| D. | None of these |
| Answer» D. None of these | |
| 40. |
Match List - I (particle) with List - II (approximate rest energy in MeV) and select the correct answer using the codes gives the lists |
| A. | A. |
| B. | B. |
| C. | C. |
| D. | D. |
| Answer» C. C. | |
| 41. |
Radioactivity |
| A. | Rutherford |
| B. | Henry Becquerel |
| C. | Bohr |
| D. | Madame Curie |
| Answer» C. Bohr | |
| 42. |
Photoelectric effect |
| A. | Hertz |
| B. | Einstein |
| C. | Plank |
| D. | Bohr |
| Answer» C. Plank | |
| 43. |
Electron beam therapy |
| A. | enlarged prostate gland |
| B. | gall bladder stones |
| C. | certain types of cancer |
| D. | kidney stones |
| Answer» D. kidney stones | |
| 44. |
Food in the pressure cooked faster, as |
| A. | the boiling points increases due to an increase in pressure |
| B. | the boiling points decreases due to an increase in pressure |
| C. | more steam is available at 100 C |
| D. | more pressure is available at 100 C |
| Answer» B. the boiling points decreases due to an increase in pressure | |
| 45. |
Neutrino is a particle which |
| A. | Has no charge but has spin |
| B. | Is charged like electron and has spin |
| C. | Has no charge and no spin |
| D. | None of the above |
| Answer» B. Is charged like electron and has spin | |
| 46. |
The cathode ray particles originate in a discharge tube from the |
| A. | Cathode |
| B. | Anode |
| C. | Source of high voltage |
| D. | Residual gas |
| Answer» B. Anode | |
| 47. |
A photo sensitive material would emit electrons, if excited by photons beyond a threshold. To overcome the threshold, one would increase |
| A. | The voltage applied to the light source |
| B. | Intensity of light |
| C. | The wavelength of light |
| D. | The frequency of light |
| Answer» E. | |
| 48. |
Compton effect is associated with |
| A. | Positive rays |
| B. | - rays |
| C. | y - rays |
| D. | X - rays |
| Answer» E. | |
| 49. |
During a nuclear fusion reaction |
| A. | A heavy nucleus breaks into two fragments by itself |
| B. | A light nucleus bombarded by thermal neutrons breaks up |
| C. | A heavy nucleus bombarded by thermal neutrons breaks up |
| D. | Two light nuclei combine to give a heavier nucleus and possibly other products |
| Answer» E. | |
| 50. |
Pick out the statement which is true |
| A. | The energy released per unit mass is more in fusion and that per atom in more in fission |
| B. | Both fission and fusion produce same amount of energy per atom as well as per unit mass |
| C. | The energy released per unit mass |
| D. | The energy released per atom is more in fusion then in fission |
| Answer» B. Both fission and fusion produce same amount of energy per atom as well as per unit mass | |