MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Element which has [Ar]4s2 electronic configuration is |
| A. | potassium |
| B. | calcium |
| C. | copper |
| D. | zinc |
| Answer» C. copper | |
| 2. |
The particles which revolve around the nucleus are called |
| A. | proton |
| B. | electrons |
| C. | neutron |
| D. | none of above |
| Answer» C. neutron | |
| 3. |
To determine the mass of another compound by comparing it with the mass of carbon-12 atoms is |
| A. | relative molecular mass |
| B. | relative atomic mass |
| C. | relative molecular radius |
| D. | relative atomic radius |
| Answer» C. relative molecular radius | |
| 4. |
The number of atoms in the same element has the same number of |
| A. | protons |
| B. | electrons |
| C. | neutrons |
| D. | none of above |
| Answer» B. electrons | |
| 5. |
When spectra is observed in high resolving spectrometer, each line formed is consist of pair of lines, this structure is called |
| A. | single line |
| B. | doublet line |
| C. | triple line |
| D. | pressed line |
| Answer» C. triple line | |
| 6. |
Lithium has electrons |
| A. | 2 |
| B. | 3 |
| C. | 1 |
| D. | 4 |
| Answer» C. 1 | |
| 7. |
The shape of s-orbital is |
| A. | tetrahedral |
| B. | octagonal |
| C. | spherical |
| D. | round |
| Answer» D. round | |
| 8. |
The presence of electrons is shown by three-dimensional shape of orbit with |
| A. | high probability |
| B. | low probability |
| C. | no probability |
| D. | slow ratio |
| Answer» B. low probability | |
| 9. |
After Bohr atomic model series of spectral line of hydrogen atom discovered was |
| A. | Balmer series |
| B. | Pfund series |
| C. | Lyman series |
| D. | Brackett series |
| Answer» C. Lyman series | |
| 10. |
Elements with full outermost shells are |
| A. | metals |
| B. | non-metals |
| C. | inert gases |
| D. | neutral oxides |
| Answer» D. neutral oxides | |
| 11. |
Protons (p⁺) and neutrons (n⁰) constitute the |
| A. | nucleus |
| B. | nucleon |
| C. | orbital |
| D. | diameter |
| Answer» C. orbital | |
| 12. |
Metals lose electrons from their lattice to become |
| A. | positive ions |
| B. | negative ions |
| C. | alkalis |
| D. | non-metals |
| Answer» B. negative ions | |
| 13. |
The instrument which is used to find relative atomic mass of each isotope in an element is called |
| A. | mass spectrometer |
| B. | atomic spectrometer |
| C. | ionic spectrometer |
| D. | volume spectrometer |
| Answer» B. atomic spectrometer | |
| 14. |
When cathode rays fall on matter they produce |
| A. | energy theory |
| B. | movement |
| C. | heat |
| D. | shine |
| Answer» D. shine | |
| 15. |
Electrons are able to revolve around nucleus vicinity in |
| A. | open orbits |
| B. | randomly |
| C. | close orbits |
| D. | clusters |
| Answer» D. clusters | |
| 16. |
Bohr stated that electron is |
| A. | material particle |
| B. | wave |
| C. | energy |
| D. | light |
| Answer» B. wave | |
| 17. |
Wavelength of lines obtained in hydrogen spectrum can be obtained in |
| A. | visible regions |
| B. | ultraviolet regions |
| C. | infrared region |
| D. | all regions |
| Answer» E. | |
| 18. |
Wave number is actually reciprocal of |
| A. | wavelength |
| B. | energy |
| C. | density |
| D. | volume |
| Answer» B. energy | |
| 19. |
Line spectrum is obtained from element or compound which is |
| A. | volatilized |
| B. | present in solid |
| C. | present in liquid state |
| D. | nitrogen spectrum |
| Answer» B. present in solid | |
| 20. |
The conduction of electricity in metallic bonding is due to presence of |
| A. | protons |
| B. | lattice |
| C. | delocalized electrons |
| D. | nucleus |
| Answer» D. nucleus | |
| 21. |
Electron affinities which are always endothermic |
| A. | 2nd electron affinity only |
| B. | 3rd electron affinity only |
| C. | 4th electron affinity |
| D. | 2nd electron affinity and 3rd electron affinity |
| Answer» E. | |
| 22. |
Effect of electric field in cathode rays can be cancelled by application of |
| A. | surface pressure |
| B. | ionization |
| C. | magnetic field |
| D. | electricity |
| Answer» D. electricity | |
| 23. |
Lines of longer wavelengths are described by |
| A. | L series |
| B. | K series |
| C. | M series |
| D. | N series |
| Answer» B. K series | |
| 24. |
The attractive forces between metal ions and delocalized electrons can be weakened or overcome by |
| A. | low temperature |
| B. | high temperature |
| C. | water |
| D. | none of above |
| Answer» C. water | |
| 25. |
Sommerfeld contributed to atomic structure in |
| A. | 1910 |
| B. | 1915 |
| C. | 1917 |
| D. | 1990 |
| Answer» C. 1917 | |
| 26. |
Particular element posses the same number of electrons hence have the same |
| A. | chemical properties |
| B. | physical properties |
| C. | density |
| D. | volume |
| Answer» B. physical properties | |
| 27. |
In Millikan oil drop method spray of oil droplets is produced by |
| A. | atomizer |
| B. | sprayer |
| C. | oil pack |
| D. | both a and b |
| Answer» B. sprayer | |
| 28. |
Splitting of spectral lines because of electric effect is known as |
| A. | Zeeman effect |
| B. | electromagnetic effect |
| C. | Stark effect |
| D. | molecular effect |
| Answer» D. molecular effect | |
| 29. |
Electrons occupy separate orbital within the same sub-shell to reduce |
| A. | attraction |
| B. | repulsion |
| C. | polarity |
| D. | conductivity |
| Answer» C. polarity | |
| 30. |
Energy is increased with increase in |
| A. | wavelength |
| B. | wave number |
| C. | density |
| D. | volume |
| Answer» C. density | |
| 31. |
The big jump in the value of ionization energy tends to cause the removal of second electron with |
| A. | ease |
| B. | difficulty |
| C. | slowly |
| D. | lastly |
| Answer» C. slowly | |
| 32. |
Mr is symbol given for relative |
| A. | molecular mass only |
| B. | formula mass only |
| C. | atomic radius |
| D. | molecular and formula mass |
| Answer» E. | |
| 33. |
If nucleon and proton number of argon is 40 and 18 respectively, respective number of electrons and neutrons will be |
| A. | 22 and 40 |
| B. | 18 and 22 |
| C. | 18 and 40 |
| D. | 22 and 28 |
| Answer» C. 18 and 40 | |
| 34. |
When target element used has more atomic number it produce X rays with |
| A. | large wavelength |
| B. | small wavelength |
| C. | zero wavelength |
| D. | none |
| Answer» D. none | |
| 35. |
Unit of energy obtained for atom is taken in |
| A. | joules/molecule |
| B. | joule/atom |
| C. | joule/element |
| D. | atom/joule |
| Answer» C. joule/element | |
| 36. |
Fast neutrons have energy which is more than |
| A. | 1.6MeV |
| B. | 1.2MeV |
| C. | 1.9MeV |
| D. | 6Mev |
| Answer» C. 1.9MeV | |
| 37. |
Formula for calculating electron is |
| A. | 2(2l+1) |
| B. | (2l+1) |
| C. | 2(2l) |
| D. | 2(2l+2) |
| Answer» D. 2(2l+2) | |
| 38. |
Azimuthal quantum number has |
| A. | two values |
| B. | three values |
| C. | four values |
| D. | five values |
| Answer» D. five values | |
| 39. |
+1 is relative charge which is present on |
| A. | proton |
| B. | electrons |
| C. | neutrons |
| D. | neutrino |
| Answer» B. electrons | |
| 40. |
Radiation which bends to a greater degree has |
| A. | long wavelength |
| B. | small wavelength |
| C. | moderate wavelength |
| D. | very small wavelength |
| Answer» C. moderate wavelength | |
| 41. |
Spectral lines obtained for hydrogen atom are divided into |
| A. | two groups |
| B. | three groups |
| C. | four groups |
| D. | five groups |
| Answer» E. | |
| 42. |
When wavelength of photon is increased its energy |
| A. | increases |
| B. | remains same |
| C. | gets doubled |
| D. | decreases |
| Answer» E. | |
| 43. |
Total number of electrons in d-sub shell are |
| A. | 2 |
| B. | 8 |
| C. | 4 |
| D. | 10 |
| Answer» E. | |
| 44. |
E/m ratio is maximum for |
| A. | nitrogen |
| B. | hydrogen |
| C. | Sulphur |
| D. | oxygen |
| Answer» C. Sulphur | |
| 45. |
The ionization energy in the outermost shell of electron (e⁻) is |
| A. | lowered |
| B. | raised |
| C. | transitional |
| D. | remain same |
| Answer» B. raised | |
| 46. |
Shape of five d-orbitals is |
| A. | identical |
| B. | symmetric |
| C. | spherical |
| D. | non identical |
| Answer» E. | |
| 47. |
Frequency is measured for |
| A. | one minute |
| B. | one hour |
| C. | one second |
| D. | one millisecond |
| Answer» D. one millisecond | |
| 48. |
Uncertainty principle is applicable to |
| A. | macroscopic particles |
| B. | microscopic particles |
| C. | gases |
| D. | both a and b |
| Answer» C. gases | |
| 49. |
The atomic number of Barium (Ba) is |
| A. | 12 |
| B. | 38 |
| C. | 20 |
| D. | 56 |
| Answer» E. | |
| 50. |
When electron jumps in n1 orbit series of spectral lines obtained is called |
| A. | Balmer series |
| B. | Pfund series |
| C. | Brackett series |
| D. | Lyman series |
| Answer» E. | |