McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Uncategorized topics .
Chapters
| 1. |
Activity is proportional to number of |
| A. | daughter nuclei |
| B. | decayed nuclei |
| C. | undecayed nuclei |
| D. | father nuclei |
| Answer» C. undecayed nuclei | |
| 2. |
Energy given to nucleus to dismantle it increases the |
| A. | kinetic energy of individual nucleons |
| B. | mechanical energy of individual nucleons |
| C. | potential energy of individual nucleons |
| D. | chemical energy of individual nucleons |
| Answer» C. potential energy of individual nucleons | |
| 3. |
Radioactive decay is a |
| A. | random process |
| B. | non-spontaneous process |
| C. | regular process |
| D. | massive process |
| Answer» A. random process | |
| 4. |
1 u is equal to {{}} |
| A. | 1.660 × 10-27 kg |
| B. | 2 × 10-27 kg |
| C. | 3 × 10-27 kg |
| D. | 5 × 10-27 kg |
| Answer» A. 1.660 × 10-27 kg | |
| 5. |
In gamma emission, the change in nucleon number is |
| A. | zero |
| B. | definite |
| C. | increase by 1 |
| D. | decreases by 1 |
| Answer» A. zero | |
| 6. |
At higher energy, the bodies have |
| A. | small mass |
| B. | large mass |
| C. | zero mass |
| D. | smaller weight |
| Answer» B. large mass | |
| 7. |
Time taken by a radioactive substance to decay half is called |
| A. | time delay |
| B. | half life |
| C. | time constant |
| D. | half period |
| Answer» B. half life | |
| 8. |
Most stable isotope in nature is of |
| A. | iron-56 |
| B. | carbon-12 |
| C. | uranium-235 |
| D. | uranium-238 |
| Answer» A. iron-56 | |
| 9. |
Activity of one decay per second is equal to |
| A. | 1 Bq |
| B. | 1 atm |
| C. | 1 mol |
| D. | 1 Cd |
| Answer» A. 1 Bq | |
| 10. |
The greater the decay constant |
| A. | the less the activity |
| B. | the greater the activity |
| C. | the greater the size |
| D. | the less the size |
| Answer» B. the greater the activity | |
| 11. |
Total amount of mass and energy together in a system is |
| A. | increasing |
| B. | decreasing |
| C. | zero |
| D. | constant |
| Answer» D. constant | |
| 12. |
Process by which energy is released in sun is |
| A. | fission |
| B. | Haber's process |
| C. | fusion |
| D. | radioactivity |
| Answer» C. fusion | |
| 13. |
Minimum energy required to pull nucleus apart is called |
| A. | ionization energy |
| B. | electron affinity |
| C. | chemical energy |
| D. | binding energy |
| Answer» D. binding energy | |
| 14. |
Mass excess for U-235 is |
| A. | 0.034 u |
| B. | 0.043 u |
| C. | 0.05 u |
| D. | 0.06 u |
| Answer» B. 0.043 u | |
| 15. |
As compared to proton, mass of neutron is |
| A. | 10% greater |
| B. | 5% greater |
| C. | 1% greater |
| D. | 0.1% greater |
| Answer» D. 0.1% greater | |
| 16. |
1 mole of uranium-238 has potential to emit total energy equal to about |
| A. | 109 J |
| B. | 1010 J |
| C. | 1011 J |
| D. | 1012 J |
| Answer» C. 1011 J | |
| 17. |
If energy is released from a system, it's mass |
| A. | decreases |
| B. | increases |
| C. | constant |
| D. | zero |
| Answer» A. decreases | |
| 18. |
New nucleus after alpha particle decays, is called |
| A. | parent nucleus |
| B. | daughter nucleus |
| C. | decayed nucleus |
| D. | undecayed nucleus |
| Answer» B. daughter nucleus | |
| 19. |
If nucleus is formed from separate nucleons, then energy is |
| A. | gained |
| B. | released |
| C. | converted |
| D. | absorbed |
| Answer» B. released | |
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