MCQOPTIONS
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MCQOPTIONS
This section includes 38 Mcqs, each offering curated multiple-choice questions to sharpen your SRMJEEE knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Nuclei which do not emit radiations naturally are called |
| A. | unstable nuclei |
| B. | stable nuclei |
| C. | positive nuclei |
| D. | negative nuclei |
| Answer» C. positive nuclei | |
| 2. |
Phenomenon in which radiations split matter in to ions is called |
| A. | denaturing |
| B. | ionization |
| C. | condensation |
| D. | atomization |
| Answer» C. condensation | |
| 3. |
Technimum-99 has half-life of 6 hours. If there is 300 mg of it, how much will be left in 48 hours? |
| A. | 1.58 mg |
| B. | 1.25 mg |
| C. | 1.17 mg |
| D. | 2.56 mg |
| Answer» D. 2.56 mg | |
| 4. |
Radiations that can ionize matter are |
| A. | alpha radiations |
| B. | alpha radiations |
| C. | beta radiations |
| D. | all beta, alpha and gamma radiations |
| Answer» E. | |
| 5. |
Radium-226 has a half-life of |
| A. | 1160 years |
| B. | 1340 years |
| C. | 1580 years |
| D. | 1620 years |
| Answer» E. | |
| 6. |
A stream of high energy electrons is |
| A. | alpha radiation |
| B. | gamma radiation |
| C. | both alpha and beta radiations |
| D. | beta radiation |
| Answer» E. | |
| 7. |
A process in which heavy nucleus splits into two by bombarding a slow moving neutron is called |
| A. | radioactivity |
| B. | nuclear fusion |
| C. | nuclear fission |
| D. | nuclear spilitting |
| Answer» D. nuclear spilitting | |
| 8. |
Half-life of Carbon-14 is |
| A. | 23 years |
| B. | 1000 years |
| C. | 1200 years |
| D. | 5730 years |
| Answer» E. | |
| 9. |
Radiation which primarily consists of protons, electrons, alpha particles and large nuclei are called |
| A. | environmental radiations |
| B. | background radiations |
| C. | positive radiations |
| D. | cosmic radiations |
| Answer» E. | |
| 10. |
Radiation which strongly interacts with matter due to its charge and has a short range as compared to gamma radiations is |
| A. | alpha radiation |
| B. | beta radiation |
| C. | no radiation |
| D. | none of the above |
| Answer» C. no radiation | |
| 11. |
In fission, mass of products is |
| A. | less than original nucleus |
| B. | more than original nucleus |
| C. | equal to original nucleus |
| D. | both B and C |
| Answer» B. more than original nucleus | |
| 12. |
If activity of a sample of radioactive bismuth decreases to 1/8 of its original activity in 15 days, then sample's half life will be |
| A. | 3 days |
| B. | 10 days |
| C. | 5 days |
| D. | 7 days |
| Answer» D. 7 days | |
| 13. |
In nuclear fission, as compared to original mass of heavy nucleus, total mass of product is |
| A. | equal |
| B. | more |
| C. | less |
| D. | zero |
| Answer» D. zero | |
| 14. |
In alpha decay (α-decay) proton number of parent nuclide |
| A. | increases by 2 |
| B. | increases by 1 |
| C. | decreases by 2 |
| D. | decreases by 4 |
| Answer» D. decreases by 4 | |
| 15. |
Number of protons and neutrons in nucleus is called |
| A. | neutron number (N) |
| B. | atomic number (Z) |
| C. | atomic mass number (A) |
| D. | electron number (E) |
| Answer» D. electron number (E) | |
| 16. |
Fast moving light photons is |
| A. | alpha radiation |
| B. | gamma radiation |
| C. | both alpha and beta radiations |
| D. | beta radiation |
| Answer» C. both alpha and beta radiations | |
| 17. |
Number of neutrons in nucleus is called |
| A. | neutron number (N) |
| B. | atomic number (Z) |
| C. | atomic mass number (A) |
| D. | electron number (E) |
| Answer» C. atomic mass number (A) | |
| 18. |
Compound containing some amount of radioisotope is |
| A. | tracer |
| B. | radioactive compound |
| C. | non radioactive |
| D. | linear active compound |
| Answer» B. radioactive compound | |
| 19. |
Most of nuclei with atomic number 1 to 82 are |
| A. | positive nuclei |
| B. | negative nuclei |
| C. | unstable nuclei |
| D. | stable nuclei |
| Answer» E. | |
| 20. |
If a radioactive element has a half-life of 40 minutes. initial count rate was 1000 per minute, then how long will it take for count rate to drop to 125 per minutes |
| A. | 120 minutes |
| B. | 90 minutes |
| C. | 30 minutes |
| D. | 60 minutes |
| Answer» B. 90 minutes | |
| 21. |
Positive charge in an atom was concentrated in a small region called |
| A. | atomic mass |
| B. | electron |
| C. | proton |
| D. | nucleus |
| Answer» E. | |
| 22. |
Age of fossil when C-14: C-12 in bone is one fourth of ratio in bone of living animal andhalf-life of C-14 is 5732 years is |
| A. | 100 years |
| B. | 11460 years |
| C. | 1000 years |
| D. | 1200 years |
| Answer» C. 1000 years | |
| 23. |
Elements whose atomic number is greater than 82 are naturally |
| A. | unstable nuclei |
| B. | stable nuclei |
| C. | positive nuclei |
| D. | negative nuclei |
| Answer» B. stable nuclei | |
| 24. |
During natural radioactivity unstable nucleus disintegrates to become more |
| A. | stable |
| B. | unstable |
| C. | excited |
| D. | unexcited |
| Answer» B. unstable | |
| 25. |
Nuclei with atomic number 1 to 82 are |
| A. | stable |
| B. | unstable |
| C. | moderately stable |
| D. | radioactive |
| Answer» B. unstable | |
| 26. |
Beta particles are stream of high energy |
| A. | electrons |
| B. | protons |
| C. | photons |
| D. | positrons |
| Answer» B. protons | |
| 27. |
Phenomenon by which radiations split matter into negative and positive ions is called |
| A. | ionization |
| B. | radiation |
| C. | transmutation |
| D. | radioactivity |
| Answer» B. radiation | |
| 28. |
Radiation emitted from splits into |
| A. | 2 components |
| B. | 4 components |
| C. | 5 components |
| D. | 3 components |
| Answer» E. | |
| 29. |
Number of protons inside nucleus represents |
| A. | atomic mass |
| B. | atomic number |
| C. | atomic count |
| D. | radioactivity level |
| Answer» C. atomic count | |
| 30. |
Isotopes have same number of protons but different number of |
| A. | electrons |
| B. | neutrons |
| C. | shells |
| D. | positrons |
| Answer» C. shells | |
| 31. |
In air, alpha particles have range of |
| A. | few centimeters |
| B. | several thousand meters |
| C. | several hundred meters |
| D. | several meters |
| Answer» B. several thousand meters | |
| 32. |
Gamma (γ) radiation are fast moving |
| A. | electrons |
| B. | protons |
| C. | photons |
| D. | neutrons |
| Answer» D. neutrons | |
| 33. |
Radiations present in atmosphere due to different radioactive substances are called |
| A. | environmental radiations |
| B. | background radiations |
| C. | positive radiations |
| D. | cosmic radiations |
| Answer» C. positive radiations | |
| 34. |
A helium nucleus comprising of two protons and two neutrons with a charge of 2e is |
| A. | beta particle |
| B. | gamma particle |
| C. | alpha particle |
| D. | negative particle |
| Answer» D. negative particle | |
| 35. |
In SI base units, 1 Bq is equal to |
| A. | 10 disintegration per second |
| B. | 1.5 disintegration per second |
| C. | 0.01 disintegration per second |
| D. | 1 disintegration per second |
| Answer» E. | |
| 36. |
Elements which emit natural radioactivity are known as |
| A. | radio elements |
| B. | active elements |
| C. | radioactive elements |
| D. | nuclear elements |
| Answer» D. nuclear elements | |
| 37. |
When two light nuclei combine to form a heavier nucleus, process is said to be |
| A. | nuclear fission |
| B. | nuclear fusion |
| C. | nuclear power |
| D. | nuclear transmutation |
| Answer» C. nuclear power | |
| 38. |
Alpha (α) particles are helium (He) nucleus with a charge of |
| A. | e |
| B. | 2e |
| C. | 3e |
| D. | 4e |
| Answer» C. 3e | |