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. |
The surface where the probability for finding the electron is zero between two orbitals is called |
| A. | nodal surface |
| B. | plane surface |
| C. | curve surface |
| D. | none |
| Answer» B. plane surface | |
| 2. |
The value of 'm' depends upon values of |
| A. | s |
| B. | l |
| C. | d |
| D. | f |
| Answer» C. d | |
| 3. |
When electron is brought from infinity to radius r its energy |
| A. | increases |
| B. | decreases |
| C. | remains same |
| D. | no effect |
| Answer» C. remains same | |
| 4. |
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 | |
| 5. |
The value of wave number when electron of hydrogen jumps from n2 to n1 is |
| A. | x105 |
| B. | x105 |
| C. | x105 |
| D. | x105 |
| Answer» D. x105 | |
| 6. |
The total energy of electrons consist of |
| A. | three energies |
| B. | two energies |
| C. | four energies |
| D. | five energies |
| Answer» C. four energies | |
| 7. |
Wave number is actually reciprocal of |
| A. | wavelength |
| B. | energy |
| C. | density |
| D. | volume |
| Answer» B. energy | |
| 8. |
In line spectrum of sodium the number of lines obtained are |
| A. | three |
| B. | two |
| C. | four |
| D. | five |
| Answer» C. four | |
| 9. |
The unit of Planck's constant is |
| A. | Js |
| B. | second |
| C. | minute |
| D. | hourJ |
| Answer» B. second | |
| 10. |
Bohr stated that electron is |
| A. | material particle |
| B. | wave |
| C. | energy |
| D. | none |
| Answer» B. wave | |
| 11. |
The e/m value of electron is measured for certain mass of electrons whose minimum value is |
| A. | 2 kg |
| B. | 9 kg |
| C. | 1 kg |
| D. | 6 kg |
| Answer» D. 6 kg | |
| 12. |
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. | none |
| Answer» C. triple line | |
| 13. |
Cathode rays when strike anode particles produce |
| A. | gamma rays |
| B. | X rays |
| C. | beta rays |
| D. | alpha rays |
| Answer» C. beta rays | |
| 14. |
Uncertainty principle is applicable to |
| A. | macroscopic particles |
| B. | microscopic particles |
| C. | gases |
| D. | none |
| Answer» C. gases | |
| 15. |
The value of ionization energy for hydrogen atom is |
| A. | 1313.31kJ/mole |
| B. | 234kJ/mole |
| C. | 1717.71kJ/mole |
| D. | 1567kj/mole |
| Answer» B. 234kJ/mole | |
| 16. |
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. | none |
| Answer» D. none | |
| 17. |
Electrons are able to revolve around nucleus vicinity in |
| A. | open orbits |
| B. | randomly |
| C. | close orbits |
| D. | clusters |
| Answer» D. clusters | |
| 18. |
Proton number is represented by |
| A. | A |
| B. | G |
| C. | H |
| D. | Z |
| Answer» E. | |
| 19. |
The wavelength of orange color is |
| A. | 500nm-600nm |
| B. | 600nm-620nm |
| C. | 300-450nm |
| D. | 200-300nm |
| Answer» C. 300-450nm | |
| 20. |
The other source of rainbow other than sun is |
| A. | incandescent solids |
| B. | soft solids |
| C. | liquids |
| D. | gases |
| Answer» B. soft solids | |
| 21. |
The wavelength of X rays is |
| A. | larger than visible regions |
| B. | smaller than visible regions |
| C. | same as visible region |
| D. | not range |
| Answer» C. same as visible region | |
| 22. |
b' in Moseley equation is |
| A. | proportionality constant |
| B. | screening constant |
| C. | double constant |
| D. | Rydberg constant |
| Answer» C. double constant | |
| 23. |
For discovery of neutron stream of particles was used which are |
| A. | alpha particles |
| B. | beta particles |
| C. | gamma particles |
| D. | none |
| Answer» B. beta particles | |
| 24. |
Total number of electrons in p-sub shell are |
| A. | 6 |
| B. | 4 |
| C. | 10 |
| D. | none |
| Answer» B. 4 | |
| 25. |
Elements were properly arranged in Mendeleev periodic table by |
| A. | Rutherford |
| B. | Bohr |
| C. | Moseley |
| D. | Einstein |
| Answer» D. Einstein | |
| 26. |
The mass in kg of a proton is |
| A. | x10-27 |
| B. | x10-27 |
| C. | x10-27 |
| D. | x10-27 |
| Answer» B. x10-27 | |
| 27. |
620nm to 800nm is the wavelength for |
| A. | red color |
| B. | yellow color |
| C. | blue color |
| D. | black color |
| Answer» B. yellow color | |
| 28. |
When electron jumps from excited state to a ground state the observed spectra is |
| A. | emission spectra |
| B. | absorption spectra |
| C. | normal spectra |
| D. | none |
| Answer» B. absorption spectra | |
| 29. |
The direction in which positive rays travel is opposite to |
| A. | anode |
| B. | cathode rays |
| C. | towards adjacent wall |
| D. | towards opposite wall |
| Answer» C. towards adjacent wall | |
| 30. |
When electron jumps from infinity orbit to n1 in Lyman series the line developed is called |
| A. | extended line |
| B. | limiting line |
| C. | series line |
| D. | parallel line |
| Answer» C. series line | |
| 31. |
Rutherford model was unsatisfactory because it could not explain movement of |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | positrons |
| Answer» B. protons | |
| 32. |
When electron changes its orbit from outer to inner energy is |
| A. | absorbed |
| B. | released |
| C. | no change |
| D. | remains constant |
| Answer» C. no change | |
| 33. |
The spectrum of hydrogen can be obtained in |
| A. | test tube |
| B. | discharge tube |
| C. | glass |
| D. | space |
| Answer» C. glass | |
| 34. |
The maximum number of electrons that can be accommodated in a shell is given by |
| A. | 2n2 |
| B. | 2n3 |
| C. | 2n |
| D. | none |
| Answer» B. 2n3 | |
| 35. |
The spectrum of X Rays include |
| A. | c series |
| B. | f series |
| C. | K series |
| D. | B series |
| Answer» D. B series | |
| 36. |
The wave numbers decrease from |
| A. | Lyman to Pfund series |
| B. | pfund to Lyman series |
| C. | balmer series to Barackett series |
| D. | none |
| Answer» B. pfund to Lyman series | |
| 37. |
Paschen series lies in |
| A. | UV region |
| B. | visible region |
| C. | infrared region |
| D. | none |
| Answer» D. none | |
| 38. |
Green is the color of |
| A. | visible spectrum |
| B. | infrared spectrum |
| C. | X-rays |
| D. | Gamma rays |
| Answer» B. infrared spectrum | |
| 39. |
Neutron was emitted by rearrangement of nuclei of beryllium and |
| A. | alpha particles |
| B. | beta particles |
| C. | gamma particles |
| D. | none |
| Answer» B. beta particles | |
| 40. |
Each orbit possesses |
| A. | quantum energy |
| B. | density of radiation |
| C. | volume |
| D. | boundary |
| Answer» B. density of radiation | |
| 41. |
The value of electron permittivity in Columb square per Joule per meter is |
| A. | 6*10^-12 |
| B. | 9.34*10^-12 |
| C. | 8.84*10^-12 |
| D. | 5*10^-12 |
| Answer» D. 5*10^-12 | |
| 42. |
x105 is wave number for spectral line |
| A. | Hα |
| B. | HΒ |
| C. | Hγ |
| D. | Hω |
| Answer» C. Hγ | |
| 43. |
Positive rays in discharge tube produced glow on wall opposite to |
| A. | anode |
| B. | cathode |
| C. | lateral wall |
| D. | parallel wall |
| Answer» B. cathode | |
| 44. |
To describe metal characteristics in X Rays the equation given was |
| A. | Rutherford equation |
| B. | Moseley equation |
| C. | Bohr equation |
| D. | none |
| Answer» C. Bohr equation | |
| 45. |
The spectrum of light in addition to visible light has |
| A. | six regions |
| B. | five regions |
| C. | seven regions |
| D. | eight regions |
| Answer» D. eight regions | |
| 46. |
The 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 | |
| 47. |
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 | |
| 48. |
The value of waves produced by macroscopic particles is |
| A. | large |
| B. | moderate |
| C. | very small |
| D. | none |
| Answer» D. none | |
| 49. |
The expression for the nth radius of atom was derived by |
| A. | Rutherford |
| B. | Bohr |
| C. | Edward |
| D. | J Thomson |
| Answer» C. Edward | |
| 50. |
Cathode rays produce glow on |
| A. | adjacent wall |
| B. | parallel wall |
| C. | opposite wall |
| D. | no glow produced |
| Answer» D. no glow produced | |