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. |
Quantum numbers are used to describe |
| A. | proton |
| B. | nucleus |
| C. | electron |
| D. | positron |
| Answer» D. positron | |
| 2. |
The value of n is 1 for |
| A. | K shell |
| B. | L shell |
| C. | M shell |
| D. | N shell |
| Answer» B. L shell | |
| 3. |
The level of energy of all three p-orbitals in the absence of magnetic field is |
| A. | less |
| B. | more |
| C. | same |
| D. | none |
| Answer» D. none | |
| 4. |
The last series which is obtained in hydrogen spectrum is |
| A. | Lyman series |
| B. | Balmer series |
| C. | Brackett series |
| D. | Pfund series |
| Answer» E. | |
| 5. |
Positive rays shows positive charge by deflection through |
| A. | magnetic field |
| B. | electric field |
| C. | both electric and magnetic field |
| D. | no field |
| Answer» D. no field | |
| 6. |
A sub shell shapes depend upon the value of |
| A. | s |
| B. | l |
| C. | p |
| D. | d |
| Answer» C. p | |
| 7. |
When cathode rays fall on matter they produce |
| A. | energy theory |
| B. | movement |
| C. | heat |
| D. | shine |
| Answer» D. shine | |
| 8. |
Atomic spectrum can be produced by help of high temperature or |
| A. | water pressure |
| B. | electric discharge |
| C. | light |
| D. | sound energy |
| Answer» C. light | |
| 9. |
The tube to discover electrons is fitted with |
| A. | vapors |
| B. | liquids |
| C. | solids |
| D. | none |
| Answer» B. liquids | |
| 10. |
The electrons produced in X rays are accelerated by |
| A. | high temperature |
| B. | high pressure |
| C. | high volume |
| D. | high voltage |
| Answer» E. | |
| 11. |
The value of energy of electron for fourth orbit of hydrogen atom is |
| A. | −328.32 |
| B. | −1313.31 |
| C. | −82.08 |
| D. | −145.92 |
| Answer» D. −145.92 | |
| 12. |
The lines of shorter wavelength comes in |
| A. | N series |
| B. | M series |
| C. | K series |
| D. | L series |
| Answer» D. L series | |
| 13. |
Ionization in gases can be produced with help of |
| A. | anode rays |
| B. | neutrons |
| C. | cathode rays |
| D. | ions |
| Answer» D. ions | |
| 14. |
The radius of hydrogen first orbit is |
| A. | 0.529 angstrom |
| B. | 2.11 angstrom |
| C. | 13.22 angstrom |
| D. | 4.75 angstrom |
| Answer» B. 2.11 angstrom | |
| 15. |
The Melting Point of which of these elements is highest? |
| A. | Ca |
| B. | Be |
| C. | Mg |
| D. | Sr |
| Answer» C. Mg | |
| 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. |
The electrons in experiment of X Ray production are produced by |
| A. | mercury filament |
| B. | tin filament |
| C. | sodium metal |
| D. | tungsten filament |
| Answer» E. | |
| 18. |
a' in Moseley equation is |
| A. | proportionality constant |
| B. | screening constant |
| C. | double constant |
| D. | Rydberg constant |
| Answer» B. screening constant | |
| 19. |
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 | |
| 20. |
There is refraction and bending of light when radiation is passed through |
| A. | plastic |
| B. | solid |
| C. | prism |
| D. | wood |
| Answer» D. wood | |
| 21. |
The value of energy for second orbit of hydrogen in kilo joule per mole |
| A. | −328.32 |
| B. | −1313.31 |
| C. | −145.92 |
| D. | −82.08 |
| Answer» B. −1313.31 | |
| 22. |
Pauli's Exclusion principle state that two electrons in the same orbitals have |
| A. | same spins |
| B. | different spins |
| C. | opposite spins |
| D. | vertical spins |
| Answer» D. vertical spins | |
| 23. |
In Rutherford atomic model the alpha particles were stroked on |
| A. | aluminium |
| B. | gold |
| C. | silver |
| D. | titanium |
| Answer» C. silver | |
| 24. |
Dual nature of matter was experimentally verified by striking electron on |
| A. | platinum crystal |
| B. | nickel crystal |
| C. | steel |
| D. | cadmium |
| Answer» C. steel | |
| 25. |
The background in atomic emission spectrum is |
| A. | light |
| B. | dark |
| C. | pink |
| D. | blue spaces |
| Answer» C. pink | |
| 26. |
The unit picometer is actually |
| A. | 10^-9 meter |
| B. | 10^-8m |
| C. | 10^-12m |
| D. | 10^-5m |
| Answer» D. 10^-5m | |
| 27. |
Rutherford in his experiment used |
| A. | alpha particles |
| B. | beta particles |
| C. | gamma particles |
| D. | zeta particles |
| Answer» B. beta particles | |
| 28. |
Azimuthal quantum number is represented by |
| A. | m |
| B. | n |
| C. | l |
| D. | p |
| Answer» D. p | |
| 29. |
Atomic spectrum is viewed in |
| A. | three ways |
| B. | two ways |
| C. | five ways |
| D. | six ways |
| Answer» C. five ways | |
| 30. |
The smallest charge which was observed by Millikan was |
| A. | x10-19 |
| B. | x10-19 |
| C. | x10-19 |
| D. | x10-19 |
| Answer» E. | |
| 31. |
Another name for positive rays is |
| A. | cathode rays |
| B. | anode rays |
| C. | canal rays |
| D. | neutral rays |
| Answer» D. neutral rays | |
| 32. |
The value of energy for first orbit of hydrogen in kilo joule per mole is |
| A. | −145 |
| B. | −1313.31 |
| C. | 1313.31 |
| D. | 145.92 |
| Answer» C. 1313.31 | |
| 33. |
The e/m ratio is maximum for |
| A. | nitrogen |
| B. | hydrogen |
| C. | Sulphur |
| D. | oxygen |
| Answer» C. Sulphur | |
| 34. |
The letter s for azimuthal quantum number stands for |
| A. | sharp |
| B. | strong |
| C. | sufficient |
| D. | simple |
| Answer» B. strong | |
| 35. |
Cathode rays are not simply rays but they are actually |
| A. | mass |
| B. | material particles |
| C. | velocity |
| D. | shaped molecules |
| Answer» C. velocity | |
| 36. |
The thickness of gold foil is |
| A. | 0.00004cm |
| B. | 0.00007cm |
| C. | 0.09cm |
| D. | 0.008cm |
| Answer» B. 0.00007cm | |
| 37. |
Comprehensive study on X rays was done by |
| A. | Sommerfeld |
| B. | Moseley |
| C. | Bohr |
| D. | Rutherford |
| Answer» C. Bohr | |
| 38. |
Neutron is splitted into proton, electron and |
| A. | anti neutrino |
| B. | positron |
| C. | neutrino |
| D. | none |
| Answer» D. none | |
| 39. |
The number of protons in the nucleus is similar to number of |
| A. | neutrons |
| B. | neutrino |
| C. | positrons |
| D. | electrons |
| Answer» E. | |
| 40. |
Heisenberg gave his concept in |
| A. | 1923 |
| B. | 1927 |
| C. | 1980 |
| D. | 1990 |
| Answer» C. 1980 | |
| 41. |
Another name for line spectrum is |
| A. | atomic spectrum |
| B. | continuous spectrum |
| C. | hydrogen spectrum |
| D. | none |
| Answer» B. continuous spectrum | |
| 42. |
The electrons should be filled in energy sub shells in order of increasing energy values is the principle of |
| A. | Aufbau |
| B. | Pauli's exclusion |
| C. | Hund's |
| D. | none |
| Answer» B. Pauli's exclusion | |
| 43. |
Atom is composed just of electrons and protons this concept prevailed till |
| A. | 1980 |
| B. | 1932 |
| C. | 1970 |
| D. | 1960 |
| Answer» C. 1970 | |
| 44. |
The fourth series which is obtained in hydrogen spectrum is |
| A. | Lyman series |
| B. | Balmer series |
| C. | Brackett series |
| D. | Pfund series |
| Answer» D. Pfund series | |
| 45. |
The radiations' bending strength depends upon |
| A. | size of photons |
| B. | distance of photons |
| C. | energy of photons |
| D. | wavelength of photons |
| Answer» E. | |
| 46. |
Wave number is calculated per unit |
| A. | energy |
| B. | length |
| C. | waves |
| D. | proton |
| Answer» C. waves | |
| 47. |
To provide low pressure in discharge tube we attach |
| A. | heat |
| B. | pressurizer |
| C. | atomizer |
| D. | vacuum pump |
| Answer» E. | |
| 48. |
The voltage which is applied in discovering electrons is |
| A. | low |
| B. | moderate |
| C. | high |
| D. | very low |
| Answer» D. very low | |
| 49. |
Work done is actually product of force and |
| A. | distance |
| B. | density |
| C. | volume |
| D. | pressure |
| Answer» B. density | |
| 50. |
The glow in the discharge tube disappears when pressure is |
| A. | 09 torr |
| B. | 0.01 torr |
| C. | 0.8 torr |
| D. | 0.9 torr |
| Answer» C. 0.8 torr | |