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. |
If nucleon (mass) and proton (atomic) number is 40 and 20 respectively, element is |
| A. | chlorine |
| B. | phosphorus |
| C. | potassium |
| D. | calcium |
| Answer» E. | |
| 2. |
Spectrum of different colored lines is characteristic of |
| A. | sodium |
| B. | potassium |
| C. | hydrogen |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 3. |
Unit used for measuring wavelength is |
| A. | angstrom |
| B. | centimeter |
| C. | meter |
| D. | millimeter |
| Answer» B. centimeter | |
| 4. |
When an electron jumps from its orbit to another orbit, energy is |
| A. | emitted only |
| B. | absorbed only |
| C. | emitted and absorbed |
| D. | no effect |
| Answer» D. no effect | |
| 5. |
Magnetic quantum number is also called |
| A. | 1st quantum number |
| B. | 2nd quantum number |
| C. | 3rd quantum number |
| D. | 4th quantum number |
| Answer» D. 4th quantum number | |
| 6. |
When electron is brought from infinity to radius r its energy |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | reflects |
| Answer» C. remains same | |
| 7. |
New element formed by reaction of alpha particles with Beryllium is |
| A. | nitrogen |
| B. | hydrogen |
| C. | carbon |
| D. | zinc |
| Answer» D. zinc | |
| 8. |
Spectrum has |
| A. | three types |
| B. | two types |
| C. | five types |
| D. | seven types |
| Answer» C. five types | |
| 9. |
Heisenberg gave his concept in |
| A. | 1923 |
| B. | 1927 |
| C. | 1980 |
| D. | 1990 |
| Answer» C. 1980 | |
| 10. |
In Bohr's model magnetic field which splits spectral lines is |
| A. | weak |
| B. | moderate |
| C. | strong |
| D. | long |
| Answer» D. long | |
| 11. |
In Millikan oil drop method electrode which has hole is |
| A. | lower one |
| B. | parallel one |
| C. | adjacent one |
| D. | upper one |
| Answer» E. | |
| 12. |
Azimuthal quantum number actually represents |
| A. | shells |
| B. | sub shells |
| C. | energy |
| D. | heat |
| Answer» C. energy | |
| 13. |
Use of quantum numbers is to specify electron's |
| A. | energy |
| B. | position |
| C. | particles |
| D. | velocity |
| Answer» C. particles | |
| 14. |
Frequency is represented by |
| A. | s |
| B. | l |
| C. | n |
| D. | p |
| Answer» D. p | |
| 15. |
Voltage which is applied in discharge tube is dependent upon |
| A. | length of tube |
| B. | width of tube |
| C. | tube nature |
| D. | wideness |
| Answer» B. width of tube | |
| 16. |
Planck proposed that energy travels in |
| A. | discontinuous manner |
| B. | continuous manner |
| C. | slow manner |
| D. | general manner |
| Answer» B. continuous manner | |
| 17. |
Magnetic properties of cathode rays were discovered in year |
| A. | 1897 |
| B. | 1895 |
| C. | 1893 |
| D. | 1890 |
| Answer» B. 1895 | |
| 18. |
Measurement of e/m was possible because of instrument made by |
| A. | JJ Thomson |
| B. | J Perrin |
| C. | Edison |
| D. | Bohr |
| Answer» B. J Perrin | |
| 19. |
Accelerated electrons like waves performed |
| A. | diffraction |
| B. | movement |
| C. | absorbed potential energy |
| D. | all of these |
| Answer» B. movement | |
| 20. |
Quantum numbers are used to describe |
| A. | proton |
| B. | nucleus |
| C. | electron |
| D. | positron |
| Answer» D. positron | |
| 21. |
Window through which X Rays move in experiment is made up of |
| A. | platinum |
| B. | iron |
| C. | steel |
| D. | aluminum |
| Answer» E. | |
| 22. |
Element volatilized for continuous spectrum effect the |
| A. | number of lines of spectrum |
| B. | continuity of spectrum |
| C. | thickness |
| D. | color |
| Answer» B. continuity of spectrum | |
| 23. |
1 Cycle per second is equal to |
| A. | decibels |
| B. | Hz |
| C. | per second |
| D. | none |
| Answer» C. per second | |
| 24. |
In formula 2n2 principle quantum number cannot have value of |
| A. | one |
| B. | three |
| C. | two |
| D. | zero |
| Answer» E. | |
| 25. |
The first element whose electron lies in 3d sub-shell is |
| A. | gallium |
| B. | scandium |
| C. | boron |
| D. | aluminum |
| Answer» C. boron | |
| 26. |
The specific arrangement of elements in periodic table shows |
| A. | melting point |
| B. | electronic structure |
| C. | conductivity |
| D. | polarity |
| Answer» C. conductivity | |
| 27. |
The electronic configuration of atom which possess lowest energy is the most |
| A. | stable |
| B. | unstable |
| C. | transitional |
| D. | ductile |
| Answer» B. unstable | |
| 28. |
Chamber in Millikan oil drop method is filled with |
| A. | air |
| B. | gas atoms |
| C. | oil |
| D. | pressure |
| Answer» B. gas atoms | |
| 29. |
Noble prize was awarded to Chadwick in year |
| A. | 1934 |
| B. | 1930 |
| C. | 1920 |
| D. | 1935 |
| Answer» E. | |
| 30. |
Chamber used in Millikan oil drop method has |
| A. | three parts |
| B. | two parts |
| C. | five parts |
| D. | seven parts |
| Answer» C. five parts | |
| 31. |
When high voltage will be passed through a metal, electricity will |
| A. | flow |
| B. | stop |
| C. | partially flow |
| D. | partially stop |
| Answer» B. stop | |
| 32. |
Electron is lighter than proton about |
| A. | 1890 times |
| B. | 1836 times |
| C. | 1790 times |
| D. | 1678 times |
| Answer» C. 1790 times | |
| 33. |
Valence electrons refer to the |
| A. | total number of electrons |
| B. | total number of protons and neutrons in nucleus |
| C. | total number of electrons in the outermost shell |
| D. | the two electrons in the duplet |
| Answer» D. the two electrons in the duplet | |
| 34. |
To explain origin of spectral lines |
| A. | one quantum number is sufficient |
| B. | no quantum number is needed |
| C. | one quantum number is not enough |
| D. | one quantum number adds up with another one |
| Answer» D. one quantum number adds up with another one | |
| 35. |
Pressure range which is applied in discharge tube is |
| A. | 9000-10000 |
| B. | 7000-9000 |
| C. | 4000-5000 |
| D. | 5000-10000 |
| Answer» E. | |
| 36. |
On platinum foil, when cathode rays strike foil produces |
| A. | glow |
| B. | movement |
| C. | holes |
| D. | rupturing |
| Answer» B. movement | |
| 37. |
Color which is produced in glass tube is dependent upon |
| A. | composition of glass |
| B. | glass discharge |
| C. | glass appearance |
| D. | conversion of glass |
| Answer» B. glass discharge | |
| 38. |
Elements and their isotopes have |
| A. | same number of protons |
| B. | same number of electrons |
| C. | different number of neutrons |
| D. | all of these |
| Answer» E. | |
| 39. |
Value of radius in angstrom for fourth radius of hydrogen atom is |
| A. | 0.529 angstrom |
| B. | 2.11 angstrom |
| C. | 8.4angstrom |
| D. | 13.22 angstrom |
| Answer» D. 13.22 angstrom | |
| 40. |
Wave packets are form of |
| A. | light |
| B. | energy |
| C. | volume |
| D. | waves |
| Answer» C. volume | |
| 41. |
Cathode rays produced yellow fluorescence when strike |
| A. | alumina |
| B. | sodium |
| C. | tin stone |
| D. | potassium chromate |
| Answer» D. potassium chromate | |
| 42. |
In deuterium, number of neutrons are |
| A. | 3 |
| B. | 2 |
| C. | 1 |
| D. | 0 |
| Answer» D. 0 | |
| 43. |
Line spectrum of hydrogen after a certain wavelength becomes |
| A. | splitted |
| B. | distorted |
| C. | changed |
| D. | continuous |
| Answer» E. | |
| 44. |
Photographic plate in Rutherford experiment was coated with |
| A. | Zn sulphide |
| B. | cadmium chloride |
| C. | silver chloride |
| D. | titanium |
| Answer» B. cadmium chloride | |
| 45. |
Lines which are present in atomic emission spectrum are |
| A. | brown |
| B. | dark |
| C. | bright |
| D. | translucent |
| Answer» D. translucent | |
| 46. |
The Pauli's Exclusion principle states that two electrons in same orbitals have |
| A. | same spins |
| B. | different spins |
| C. | opposite spins |
| D. | vertical spins |
| Answer» D. vertical spins | |
| 47. |
Quantum numbers are |
| A. | arithmetical values |
| B. | numerical values |
| C. | geometric values |
| D. | logical values |
| Answer» C. geometric values | |
| 48. |
Rutherford in his atomic model could not explain behavior of |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | neutrino |
| Answer» B. protons | |
| 49. |
Energy of electron -52.53kilo joule per mole is for |
| A. | first orbit of hydrogen |
| B. | second orbit of hydrogen |
| C. | third orbit of hydrogen |
| D. | fifth orbit of hydrogen |
| Answer» E. | |
| 50. |
One Bohr magneton equals |
| A. | ehc /4π n |
| B. | e c /4hπ m |
| C. | hc /m e4π |
| D. | eh /4π m c |
| Answer» E. | |