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. |
Wavelength of X rays is |
| A. | larger than visible regions |
| B. | smaller than visible regions |
| C. | same as visible region |
| D. | none of these |
| Answer» C. same as visible region | |
| 2. |
Outer electrons in atoms in Rutherford model |
| A. | are stationary |
| B. | are not stationary |
| C. | are not present |
| D. | are static |
| Answer» C. are not present | |
| 3. |
Ionization in gases can be produced with help of |
| A. | anode rays |
| B. | neutrons |
| C. | cathode rays |
| D. | ions |
| Answer» D. ions | |
| 4. |
Upward velocity of electron is directly proportional to |
| A. | mg |
| B. | Ee-mg |
| C. | Ee |
| D. | Ee+mg |
| Answer» C. Ee | |
| 5. |
If any two sub shells have same (n+l) values, then that sub shell is placed first whose n value is |
| A. | larger |
| B. | smaller |
| C. | very larger |
| D. | constant |
| Answer» C. very larger | |
| 6. |
Total number of electrons in f-sub shell are |
| A. | 10 |
| B. | 12 |
| C. | 14 |
| D. | 8 |
| Answer» C. 14 | |
| 7. |
Air in Millikan oil drop method which is present between electrodes is oxidized by |
| A. | chromatography |
| B. | gamma rays |
| C. | X rays |
| D. | infrared waves |
| Answer» D. infrared waves | |
| 8. |
The name given to sub-shells are s-sharp, p-principal and d for |
| A. | different |
| B. | diffuse |
| C. | dense |
| D. | difficult |
| Answer» C. dense | |
| 9. |
Inert gases have |
| A. | 1-3 valence electrons |
| B. | 4-7 valence electrons |
| C. | stable valence electrons in outermost shells |
| D. | up to 10 valence electrons |
| Answer» D. up to 10 valence electrons | |
| 10. |
Neutron is splitted into proton, electron and |
| A. | anti neutrino |
| B. | positron |
| C. | neutrino |
| D. | none of these |
| Answer» D. none of these | |
| 11. |
Alpha particles taken for discovery of neutron were obtained from |
| A. | titanium |
| B. | polonium |
| C. | tin stone |
| D. | lead |
| Answer» C. tin stone | |
| 12. |
X Rays are analyzed by crystal of |
| A. | sodium ferrocynaide |
| B. | calcium Ferro cyanide |
| C. | potassium Ferro cyanide |
| D. | aluminium Ferro cyanide |
| Answer» D. aluminium Ferro cyanide | |
| 13. |
Elements which are found on their own as free elements are |
| A. | gold and silver |
| B. | coal and gold |
| C. | nitrogen and gold |
| D. | gold and mercury |
| Answer» D. gold and mercury | |
| 14. |
Mass of electron which was determined by experiments is |
| A. | x10-19 |
| B. | x1011 coulombs per kg |
| C. | x10-19 coulombs |
| D. | x10-31kg |
| Answer» E. | |
| 15. |
Wavelength of X rays produced is dependent upon |
| A. | volume of material |
| B. | density of material |
| C. | nature of material |
| D. | length of material |
| Answer» D. length of material | |
| 16. |
Current does not flow in discharge tube even at voltage of |
| A. | 7000 volts |
| B. | 5000 volts |
| C. | 9000 volts |
| D. | 6000 volts |
| Answer» C. 9000 volts | |
| 17. |
Electrons produced in X rays are accelerated by |
| A. | high temperature |
| B. | high pressure |
| C. | high volume |
| D. | high voltage |
| Answer» E. | |
| 18. |
Proton rays were discovered by |
| A. | E.Goldstein |
| B. | Edward |
| C. | Thomson |
| D. | J Perrin |
| Answer» B. Edward | |
| 19. |
Particles which were deflected backwards in Rutherford's experiment were hit upon by |
| A. | nucleus |
| B. | empty space |
| C. | electrons |
| D. | protons |
| Answer» B. empty space | |
| 20. |
Number of degenerate orbitals in d-sub shell are |
| A. | three |
| B. | one |
| C. | five |
| D. | six |
| Answer» D. six | |
| 21. |
Every substance in our world is made up of |
| A. | matter |
| B. | electrons |
| C. | protons |
| D. | chemical elements |
| Answer» E. | |
| 22. |
Letter 's' for azimuthal quantum number stands for |
| A. | sharp |
| B. | strong |
| C. | sufficient |
| D. | simple |
| Answer» B. strong | |
| 23. |
Lyman series for hydrogen spectrum is present in |
| A. | visible regions |
| B. | U V region |
| C. | infrared region |
| D. | radio waves region |
| Answer» B. U V region | |
| 24. |
Lines of shorter wavelength comes in |
| A. | N series |
| B. | M series |
| C. | K series |
| D. | L series |
| Answer» D. L series | |
| 25. |
Spectrum obtained by X Rays is |
| A. | continuous spectrum |
| B. | line spectrum |
| C. | hydrogen spectrum |
| D. | non continous spectrum |
| Answer» C. hydrogen spectrum | |
| 26. |
The mole of a substance is the relative atomic mass or relative molecular mass in terms of |
| A. | milligrams |
| B. | grams |
| C. | kilograms |
| D. | micrograms |
| Answer» C. kilograms | |
| 27. |
Electron number from 2nd to 9th are present in same shell because the change in ionization is |
| A. | high to low |
| B. | low to high |
| C. | gradual |
| D. | lastly |
| Answer» D. lastly | |
| 28. |
Elements in same period may have |
| A. | different number of neutrons |
| B. | same number of shells |
| C. | different number of electrons |
| D. | all of these |
| Answer» E. | |
| 29. |
Square of atomic number of element emitting radiations effects |
| A. | wavelength |
| B. | frequency |
| C. | energy of photons |
| D. | carrier molecules |
| Answer» C. energy of photons | |
| 30. |
Lines which shows spectrum of hydrogen atom are |
| A. | combined |
| B. | attached |
| C. | perpendicular |
| D. | isolated |
| Answer» E. | |
| 31. |
Magnetic properties of cathode were discovered by |
| A. | J Thomson |
| B. | J Perrin |
| C. | Addison |
| D. | Peter |
| Answer» C. Addison | |
| 32. |
The only element which have electronic configuration of 1s² is |
| A. | helium |
| B. | lithium |
| C. | beryllium |
| D. | oxygen |
| Answer» B. lithium | |
| 33. |
When electrons (e⁻) are removed from atom, positive ions are |
| A. | reduced |
| B. | produced |
| C. | attracted |
| D. | repelled |
| Answer» C. attracted | |
| 34. |
Splitting of spectral lines due to magnetic effect is called |
| A. | Zeeman effect |
| B. | spark effect |
| C. | condensation effect |
| D. | electromagnetic effect |
| Answer» B. spark effect | |
| 35. |
Bohr theory was not able to explain |
| A. | monoelectron systems |
| B. | Li ions |
| C. | multielectron systems |
| D. | hydrogen atom |
| Answer» D. hydrogen atom | |
| 36. |
Number of space orientation of any energy level of s-sub shell is |
| A. | two |
| B. | three |
| C. | one |
| D. | four |
| Answer» D. four | |
| 37. |
Total energy of electrons consist of |
| A. | three energies |
| B. | two energies |
| C. | four energies |
| D. | five energies |
| Answer» C. four energies | |
| 38. |
Full electron shells near to nucleus have effect on outer shell electrons, of |
| A. | repelling |
| B. | attracting |
| C. | holding in center |
| D. | neutralizing charges |
| Answer» B. attracting | |
| 39. |
Lines which appear in absorption and emission spectrum are |
| A. | same |
| B. | different |
| C. | very different |
| D. | far apart |
| Answer» B. different | |
| 40. |
Pressure in chamber in Millikan oil drop method is adjusted by |
| A. | pressurize |
| B. | vacuum pump |
| C. | high pressure |
| D. | sphygmometer |
| Answer» C. high pressure | |
| 41. |
Last series which is obtained in hydrogen spectrum is |
| A. | Lyman series |
| B. | Balmer series |
| C. | Brackett series |
| D. | Pfund series |
| Answer» E. | |
| 42. |
Explanation of dual nature of matter experiment was designed by |
| A. | Davisson |
| B. | Rutherford |
| C. | Bohr |
| D. | de Broglie |
| Answer» B. Rutherford | |
| 43. |
Number of electrons (e-) in phosphorus (P) is 15. valence electrons shall be |
| A. | 2 |
| B. | 8 |
| C. | 5 |
| D. | 4 |
| Answer» D. 4 | |
| 44. |
Velocity of oil droplet is dependent upon its |
| A. | weight |
| B. | energy |
| C. | light |
| D. | glow |
| Answer» B. energy | |
| 45. |
Millikan oil drop method was discovered in |
| A. | 1980 |
| B. | 1909 |
| C. | 1930 |
| D. | 1967 |
| Answer» C. 1930 | |
| 46. |
A sub shell shapes depend upon value of |
| A. | s |
| B. | l |
| C. | p |
| D. | d |
| Answer» C. p | |
| 47. |
Value of droplet moving upward and that moving downward is recorded by |
| A. | machine |
| B. | microscope |
| C. | atomizer |
| D. | chromatogram |
| Answer» C. atomizer | |
| 48. |
The region around the nucleus which can be filled with one or two electrons is known as |
| A. | field |
| B. | axis |
| C. | zone |
| D. | atomic orbital |
| Answer» E. | |
| 49. |
Relationship between frequency and wavelength is that they are |
| A. | inversely proportional |
| B. | directly proportional |
| C. | not related |
| D. | weakly related |
| Answer» B. directly proportional | |
| 50. |
Quantum theory was proposed in |
| A. | 1900 |
| B. | 1890 |
| C. | 1234 |
| D. | 1788 |
| Answer» B. 1890 | |