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. |
When an electron jumps from its orbit to another orbit energy is |
| A. | emitted |
| B. | absorbed |
| C. | both |
| D. | no effect |
| Answer» D. no effect | |
| 2. |
Another name for orbital is |
| A. | electron |
| B. | electronic cloud |
| C. | energy |
| D. | proton cloud |
| Answer» C. energy | |
| 3. |
Orbital motion was described in elliptical form by |
| A. | Bohr |
| B. | Sommerfeld |
| C. | Rutherford |
| D. | J Thomson |
| Answer» C. Rutherford | |
| 4. |
Physical and chemical properties of elements are affected by |
| A. | atomic number |
| B. | atomic masses |
| C. | neutrons |
| D. | protons |
| Answer» B. atomic masses | |
| 5. |
In derivation of de Broglie equation wavelength depends upon |
| A. | momentum |
| B. | mass |
| C. | velocity |
| D. | length |
| Answer» B. mass | |
| 6. |
Bohr theory was not able to explain |
| A. | monoelectron systems |
| B. | Li ions |
| C. | multielectron systems |
| D. | hydrogen atom |
| Answer» D. hydrogen atom | |
| 7. |
Zeeman effect could not be explained by |
| A. | Rutherford model |
| B. | Bohr model |
| C. | none |
| D. | modern model |
| Answer» C. none | |
| 8. |
The letter 'd' in azimuthal quantum number represents |
| A. | diffused |
| B. | dumbbell |
| C. | double |
| D. | none |
| Answer» B. dumbbell | |
| 9. |
The distance in lines of hydrogen spectrum increases when there is |
| A. | decrease in wavelength |
| B. | increase in wavelength |
| C. | same |
| D. | no effect |
| Answer» C. same | |
| 10. |
The n+l value of 6p orbital is |
| A. | 5 |
| B. | 3 |
| C. | 7 |
| D. | 8 |
| Answer» D. 8 | |
| 11. |
The number of degenerate orbitals in f-sub shell are |
| A. | six |
| B. | five |
| C. | seven |
| D. | three |
| Answer» D. three | |
| 12. |
Velocity of electron can be easily determined if it is present in |
| A. | orbit |
| B. | space |
| C. | between orbits |
| D. | nucleus |
| Answer» B. space | |
| 13. |
The 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 | |
| 14. |
Total number of electrons in f-sub shell are |
| A. | 10 |
| B. | 12 |
| C. | 14 |
| D. | 8 |
| Answer» C. 14 | |
| 15. |
In Bohr's model the magnetic field which splits the spectral lines is |
| A. | weak |
| B. | moderate |
| C. | strong |
| D. | none |
| Answer» D. none | |
| 16. |
The number of electrons in the outer most shell of alkali metals are |
| A. | two |
| B. | eight |
| C. | one |
| D. | five |
| Answer» D. five | |
| 17. |
The elements employed by Moseley for production of X-rays were |
| A. | twenty eight |
| B. | forty eight |
| C. | fifty eight |
| D. | thirty eight |
| Answer» E. | |
| 18. |
To discover electrons gas discharge tube is fitted with |
| A. | two electrodes |
| B. | three electrodes |
| C. | four electrodes |
| D. | five electrodes |
| Answer» B. three electrodes | |
| 19. |
The n+l value of 5s orbital is |
| A. | 2 |
| B. | 1 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 20. |
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 | |
| 21. |
Balmer series were discovered in |
| A. | 1867 |
| B. | 1887 |
| C. | 1789 |
| D. | 1901 |
| Answer» C. 1789 | |
| 22. |
Delta x is related to delta p |
| A. | directly |
| B. | inversely |
| C. | no relation |
| D. | none |
| Answer» C. no relation | |
| 23. |
The size of s-orbital increases when the value of principal quantum number is |
| A. | decrease |
| B. | increase |
| C. | remain same |
| D. | none |
| Answer» C. remain same | |
| 24. |
In case of radiation amount of energy is proportional to |
| A. | frequency of radiation |
| B. | density of radiation |
| C. | waves |
| D. | light |
| Answer» B. density of radiation | |
| 25. |
The pressure inside the tube to discover the electrons effects |
| A. | voltage |
| B. | pressure |
| C. | heat |
| D. | sensitivity |
| Answer» B. pressure | |
| 26. |
Proton rays were discovered by |
| A. | E.Goldstein |
| B. | Edward |
| C. | Thomson |
| D. | J Perrin |
| Answer» B. Edward | |
| 27. |
The orbits in which electrons can revolve have fixed |
| A. | shape |
| B. | route |
| C. | thickness |
| D. | angular momentum |
| Answer» E. | |
| 28. |
The energy of each orbit is |
| A. | changed |
| B. | fixed |
| C. | not same |
| D. | effected |
| Answer» C. not same | |
| 29. |
The direction of three orbitals of p-sub shell is |
| A. | parallel |
| B. | perpendicular |
| C. | congruent |
| D. | none |
| Answer» C. congruent | |
| 30. |
For heavier gases in positive rays production em ratio is |
| A. | high |
| B. | small |
| C. | very minute |
| D. | moderate |
| Answer» C. very minute | |
| 31. |
By e/m ratio of cathode rays we deduce they are |
| A. | protons |
| B. | electrons |
| C. | neutrons |
| D. | anti neutron |
| Answer» C. neutrons | |
| 32. |
The absorbed wavelengths in atomic absorption spectrum appear as |
| A. | dark background |
| B. | dark lines |
| C. | light background |
| D. | light lines |
| Answer» C. light background | |
| 33. |
Angular momentum of orbit is actually the integral multiple of |
| A. | h/2π |
| B. | h/3π |
| C. | h/9π |
| D. | h/9π |
| Answer» B. h/3π | |
| 34. |
The velocity of oil droplet is dependent upon its |
| A. | weight |
| B. | energy |
| C. | light |
| D. | glow |
| Answer» B. energy | |
| 35. |
According to Rutherford atomic model on the whole atom |
| A. | has positive charge |
| B. | has negative charge |
| C. | is neutral |
| D. | is heavy |
| Answer» D. is heavy | |
| 36. |
The alpha particles taken for the discovery of neutron were obtained from |
| A. | titanium |
| B. | polonium |
| C. | tin stone |
| D. | lead |
| Answer» C. tin stone | |
| 37. |
Bohr applied Planck's postulates on |
| A. | nitrogen atom |
| B. | carbon atom |
| C. | Sulphur atom |
| D. | hydrogen atom |
| Answer» E. | |
| 38. |
The mass of neutron in amu is |
| A. | 1.0073 |
| B. | 1.0087 |
| C. | 1.0098 |
| D. | 1.0065 |
| Answer» C. 1.0098 | |
| 39. |
The name principle quantum number was given by |
| A. | Rutherford |
| B. | Bohr |
| C. | Schrodinger |
| D. | Rydberg |
| Answer» D. Rydberg | |
| 40. |
Wave equation on hydrogen atom was given by |
| A. | Dirac |
| B. | Schrodinger |
| C. | Heisenberg |
| D. | Rutherford |
| Answer» C. Heisenberg | |
| 41. |
Azimuthal quantum number actually represents |
| A. | shells |
| B. | sub shells |
| C. | energy |
| D. | none |
| Answer» C. energy | |
| 42. |
The mass of one electron in amu |
| A. | 1.0073 |
| B. | 1.0087 |
| C. | 5.4858810^-4 |
| D. | 5.58810^-4 |
| Answer» D. 5.58810^-4 | |
| 43. |
Sommerfeld contributed to atomic structure in |
| A. | 1910 |
| B. | 1915 |
| C. | 1917 |
| D. | 1990 |
| Answer» C. 1917 | |
| 44. |
The n+l value of 2p orbital is |
| A. | 4 |
| B. | 3 |
| C. | 6 |
| D. | 5 |
| Answer» C. 6 | |
| 45. |
The e/m of electrons as compared to positive rays is |
| A. | equal |
| B. | greater |
| C. | smaller |
| D. | none |
| Answer» C. smaller | |
| 46. |
When the wavelength of the photon is increased its energy |
| A. | increases |
| B. | remains same |
| C. | not related |
| D. | decreases |
| Answer» E. | |
| 47. |
The wavelength of 400-430nm is for |
| A. | yellow color |
| B. | violet color |
| C. | blue color |
| D. | purple color |
| Answer» C. blue color | |
| 48. |
The wavelength of green color is |
| A. | 480-550nm |
| B. | 300-900nm |
| C. | 789-900nm |
| D. | 600-789nm |
| Answer» B. 300-900nm | |
| 49. |
The spectral lines of hydrogen atom which are present in visible region are named as |
| A. | Bracket series |
| B. | Balmer series |
| C. | Lyman series |
| D. | Paschen series |
| Answer» C. Lyman series | |
| 50. |
The model of atoms which was proposed by Rutherford was |
| A. | circular path |
| B. | cylindrical |
| C. | planetary |
| D. | oval |
| Answer» D. oval | |