MCQOPTIONS
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MCQOPTIONS
This section includes 23 Mcqs, each offering curated multiple-choice questions to sharpen your Materials Science knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Gravitational force = Gm1m2/r2. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
Pick out the isobar of 18Ar40. |
| A. | 12Mg24 |
| B. | 26Fe58 |
| C. | 19K40 |
| D. | 28Ni64 |
| Answer» D. 28Ni64 | |
| 3. |
Find out the number of neutrons, protons, and electrons of 17Cl37 respectively. |
| A. | 20, 20, 17 |
| B. | 17, 17, 20 |
| C. | 20, 17, 17 |
| D. | 17, 17, 17 |
| Answer» D. 17, 17, 17 | |
| 4. |
Chemical properties of an atom are dependent on a number of electrons in that particular atom. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5. |
Which of the following is not an isotope of hydrogen? |
| A. | protium |
| B. | deuterium |
| C. | tritium |
| D. | helium |
| Answer» E. | |
| 6. |
If the number of protons and neutrons of an element is 13 and 14 respectively, then what’s the atomic number(Z) and mass number(A)? |
| A. | 13, 13 |
| B. | 13, 27 |
| C. | 14, 13 |
| D. | 27, 14 |
| Answer» C. 14, 13 | |
| 7. |
Which of the following statements you think is wrong regarding α particle scattering effect? |
| A. | α particles mostly move through the gold foil having zero deflection |
| B. | A small fraction are deflected |
| C. | One in Twenty Thousand turns 180° |
| D. | The thickness of the gold foil is about 100μm |
| Answer» E. | |
| 8. |
Elements do emit radiation on their own and this property is known as _____ |
| A. | Radioactivity |
| B. | Refraction |
| C. | Absorption |
| D. | Adsorption |
| Answer» B. Refraction | |
| 9. |
Which of the following models are not the same as Thomson Model of Atom? |
| A. | plum pudding model |
| B. | watermelon model |
| C. | raisin pudding model |
| D. | nuclear model |
| Answer» E. | |
| 10. |
What is the absolute charge of a proton? |
| A. | +1.602176×10-27 |
| B. | –1.602176×10-19 |
| C. | +1.602176×10-19 |
| D. | –1.602176×10-27 |
| Answer» C. +1.602176×10-19 | |
| 11. |
Which of the following orbitals do not exist? |
| A. | 3p |
| B. | 4s |
| C. | 2s |
| D. | 3fView answer |
| Answer» E. | |
| 12. |
4f orbital has higher energy than 5p. |
| A. | True |
| B. | FalseView answer |
| Answer» B. FalseView answer | |
| 13. |
Which of the Bohr’s postulates was incorrect? |
| A. | Energy of electrons is quantized |
| B. | Momentum of electrons is quantized |
| C. | Electrons release energy when shifting from excited state to ground state |
| D. | Electrons revolve around the nucleus in fixed circular orbitsView answer |
| Answer» E. | |
| 14. |
4F_ORBITAL_HAS_HIGHER_ENERGY_THAN_5P.?$ |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
Which_of_the_following_orbitals_do_not_exist?$ |
| A. | 3p |
| B. | 4s |
| C. | 2s |
| D. | 3f |
| Answer» E. | |
| 16. |
Which of the Bohr’s postulates was incorrect?# |
| A. | Energy of electrons is quantized |
| B. | Momentum of electrons is quantized |
| C. | Electrons release energy when shifting from excited state to ground state |
| D. | Electrons revolve around the nucleus in fixed circular orbits |
| Answer» E. | |
| 17. |
Around 1911, Rutherford suggested a planetary model of atomic structure. Which of the following was not a proposition of this model? |
| A. | Electrons revolve in circular orbits around the nucleus |
| B. | Nucleus consists of protons and neutrons |
| C. | Mass of atom is concentrated in the nucleus |
| D. | Most of the volume in an atom is void |
| Answer» C. Mass of atom is concentrated in the nucleus | |
| 18. |
When an electron shifts to an inner shell, it: |
| A. | Absorbs photon |
| B. | Emits a photon |
| C. | Emits a positron |
| D. | Absorbs a positron |
| Answer» C. Emits a positron | |
| 19. |
Electronic configuration of Cu is [Ar] 3d10 4s1. Which rule is violated in this configuration? |
| A. | Aufbau Principle |
| B. | Hund’s Rule of Maximum Multiplicity |
| C. | Pauli’s Exclusion Principle |
| D. | None of the mentioned |
| Answer» B. Hund‚Äö√Ñ√∂‚àö√ë‚àö¬•s Rule of Maximum Multiplicity | |
| 20. |
Number of atomic orbitals in nth shell is: |
| A. | n<sup>2</sup> |
| B. | 2n<sup>2</sup> |
| C. | 2n + 1 |
| D. | n ‚àí 1 |
| Answer» B. 2n<sup>2</sup> | |
| 21. |
Protons attract electrons. Then why do electrons not fall on the nucleus? |
| A. | Neutrons repel the electrons |
| B. | Electrons in ground state cannot radiate energy |
| C. | At very small distances, protons repel electrons |
| D. | Inner electrons repel those in outer orbitals |
| Answer» C. At very small distances, protons repel electrons | |
| 22. |
Paired electrons in an atom have equal values of all of the four quantum numbers. |
| A. | True |
| B. | False |
| Answer» C. | |
| 23. |
In the wave-mechanical model of an atom, degenerate energy levels have: |
| A. | Equal energy |
| B. | Equal number of electrons |
| C. | Same shape |
| D. | Electrons with the same spin |
| Answer» B. Equal number of electrons | |