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. |
Each principal quantum shell consists of different numbers of |
| A. | orbitals |
| B. | magnetic field |
| C. | electric field |
| D. | electromagnetic field |
| Answer» B. magnetic field | |
| 2. |
Spectral lines for X-rays are divided into major groups which are |
| A. | two |
| B. | three |
| C. | four |
| D. | five |
| Answer» B. three | |
| 3. |
The atoms which have the same number of protons but different number of neutrons are called |
| A. | isotopes |
| B. | isomers |
| C. | spectators |
| D. | allotropes |
| Answer» B. isomers | |
| 4. |
Voltage which is applied in discovering electrons is |
| A. | low |
| B. | moderate |
| C. | high |
| D. | very low |
| Answer» D. very low | |
| 5. |
Color of spectrum of sodium is |
| A. | blue |
| B. | purple |
| C. | yellow |
| D. | black |
| Answer» D. black | |
| 6. |
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 | |
| 7. |
According to structure of atom electron should fall in |
| A. | nucleus |
| B. | shell |
| C. | outer environment |
| D. | space |
| Answer» B. shell | |
| 8. |
Atomic spectrum is viewed in |
| A. | three ways |
| B. | two ways |
| C. | five ways |
| D. | six ways |
| Answer» C. five ways | |
| 9. |
Penetration power of neutrons is |
| A. | low |
| B. | moderate |
| C. | very low |
| D. | high |
| Answer» E. | |
| 10. |
When gamma radiations are emitted from copper it is changed into |
| A. | Sulphur |
| B. | carbon tetrachloride |
| C. | zinc |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 11. |
When electron jumps from infinity orbit to n1 in Lyman series line developed is called |
| A. | extended line |
| B. | limiting line |
| C. | series line |
| D. | parallel line |
| Answer» C. series line | |
| 12. |
Elements of D-block are mainly |
| A. | transitional elements |
| B. | metals |
| C. | alkali |
| D. | noble gases |
| Answer» B. metals | |
| 13. |
A method which is used to find the amount of particular substance in a solution is called |
| A. | Fragmentation |
| B. | titration |
| C. | electrolysis |
| D. | stoichiometry |
| Answer» C. electrolysis | |
| 14. |
The elements which have the same number of protons but different number of neutrons are called |
| A. | isotopes |
| B. | isomers |
| C. | allotropes |
| D. | allomers |
| Answer» B. isomers | |
| 15. |
Dispersion of white light when passed through prism is known as |
| A. | spectrum |
| B. | spectrophotometer |
| C. | wavelength |
| D. | vacuum |
| Answer» B. spectrophotometer | |
| 16. |
Square number of orbits is actually directly proportional to |
| A. | Radius of Hydrogen |
| B. | shape of hydrogen |
| C. | color of hydrogen |
| D. | size of hydrogen |
| Answer» B. shape of hydrogen | |
| 17. |
Proton is a smallest particle which is obtained from |
| A. | nitrogen |
| B. | oxygen |
| C. | hydrogen |
| D. | gold plate |
| Answer» D. gold plate | |
| 18. |
Work was done on wave theories by |
| A. | two scientists |
| B. | three scientists |
| C. | four scientists |
| D. | five scientists |
| Answer» C. four scientists | |
| 19. |
Third orbit of hydrogen atom is far from first orbit at about |
| A. | three times |
| B. | two times |
| C. | four times |
| D. | nine times |
| Answer» E. | |
| 20. |
If number of protons and electrons are 8 respectively, valence electrons are |
| A. | 2 in number |
| B. | 4 in number |
| C. | 6 in number |
| D. | 8 in number |
| Answer» D. 8 in number | |
| 21. |
1.67x10⁻²⁷ kg is the weight of a single atom of |
| A. | oxygen |
| B. | nitrogen |
| C. | hydrogen |
| D. | water |
| Answer» D. water | |
| 22. |
In Hydrogen (H), number of neutrons is |
| A. | 2 |
| B. | 1 |
| C. | 0 |
| D. | depends upon the type of bond it enters |
| Answer» D. depends upon the type of bond it enters | |
| 23. |
Another name for line spectrum is |
| A. | atomic spectrum |
| B. | continuous spectrum |
| C. | hydrogen spectrum |
| D. | angular spectrum |
| Answer» B. continuous spectrum | |
| 24. |
The factors which influence ionization energies are |
| A. | size of nuclear charge |
| B. | distance of outer electrons |
| C. | shielding of inner electrons |
| D. | all of above |
| Answer» E. | |
| 25. |
The atom of aluminum (Al) has the number of neutrons (n⁰) |
| A. | 13 |
| B. | 27 |
| C. | 14 |
| D. | 13 |
| Answer» D. 13 | |
| 26. |
For heavier gases in positive rays production e\m ratio is |
| A. | high |
| B. | small |
| C. | very minute |
| D. | moderate |
| Answer» C. very minute | |
| 27. |
Chemical effect produced by cathode rays is that they are |
| A. | oxidizing |
| B. | anodizing |
| C. | bond forming |
| D. | reducing |
| Answer» E. | |
| 28. |
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 | |
| 29. |
Radiations emitted when slow moving neutrons hit Copper metal, are |
| A. | alpha radiations |
| B. | beta radiations |
| C. | gamma radiations |
| D. | none of these |
| Answer» D. none of these | |
| 30. |
Orbits in which electrons move according to Bohr are |
| A. | elliptical |
| B. | cylindrical |
| C. | circular |
| D. | oval |
| Answer» D. oval | |
| 31. |
For derivation of radius charge on nucleus is assumed to be |
| A. | Ze+ |
| B. | Fe+ |
| C. | Ne+ |
| D. | Ze- |
| Answer» B. Fe+ | |
| 32. |
Radioactive copper is converted into other element by emission of |
| A. | alpha particles |
| B. | beta particles |
| C. | gamma particles |
| D. | zeta particles |
| Answer» C. gamma particles | |
| 33. |
energy of each orbit is |
| A. | changed |
| B. | fixed |
| C. | not same |
| D. | effected |
| Answer» C. not same | |
| 34. |
Green is color of |
| A. | visible spectrum |
| B. | infrared spectrum |
| C. | X-rays |
| D. | Gamma rays |
| Answer» B. infrared spectrum | |
| 35. |
Period number indicates the |
| A. | number of neutrons |
| B. | the number of valence electrons |
| C. | the number of electron shells |
| D. | all of these |
| Answer» E. | |
| 36. |
In periodic table, valence electrons are indicated by |
| A. | Group Number |
| B. | Shell Number |
| C. | Period Number |
| D. | Atomic mass |
| Answer» B. Shell Number | |
| 37. |
Cathode rays are deflected usually towards the |
| A. | positive plate |
| B. | negative plate |
| C. | upward plate |
| D. | downward plate |
| Answer» B. negative plate | |
| 38. |
If nucleon and neutron numbers are 27 and 14 respectively, number of electrons will be |
| A. | 12 |
| B. | 18 |
| C. | 13 |
| D. | 15 |
| Answer» D. 15 | |
| 39. |
The enthalpy change of vaporization is lowest for |
| A. | Helium (He) |
| B. | Neon (Ne) |
| C. | Argon (Ar) |
| D. | Krypton (Kr) |
| Answer» B. Neon (Ne) | |
| 40. |
When electrons are passed through the electromagnetic field, electrons are deflected away from |
| A. | positive plate |
| B. | negative plate |
| C. | neutral plate |
| D. | oxidation plate |
| Answer» C. neutral plate | |
| 41. |
Although mercury (Hg) is held by metallic bonding yet it is a |
| A. | liquid |
| B. | gas |
| C. | solid |
| D. | vapor |
| Answer» B. gas | |
| 42. |
X rays produced by each metal are |
| A. | same |
| B. | characteristic |
| C. | not produced |
| D. | distorted |
| Answer» C. not produced | |
| 43. |
Positive rays are produced by |
| A. | molecules |
| B. | gas atoms |
| C. | solids |
| D. | liquids |
| Answer» C. solids | |
| 44. |
Radioactive copper is used in treatment of |
| A. | goiter |
| B. | cancer |
| C. | throat infection |
| D. | fever |
| Answer» C. throat infection | |
| 45. |
Instrument to measure e/m value of electron was discovered in |
| A. | 1890 |
| B. | 1897 |
| C. | 1840 |
| D. | 1845 |
| Answer» C. 1840 | |
| 46. |
Size of s-orbital increases when value of principal quantum number |
| A. | decreases |
| B. | increases |
| C. | remains constant |
| D. | fluctuates |
| Answer» C. remains constant | |
| 47. |
Example showing continuous spectrum is |
| A. | hydrogen |
| B. | nitrogen |
| C. | rainbow |
| D. | elements |
| Answer» D. elements | |
| 48. |
Properties of electron and protons were completely discovered in |
| A. | 1895 |
| B. | 1899 |
| C. | 1900 |
| D. | 1980 |
| Answer» B. 1899 | |
| 49. |
Chlorine's (Cl) relative atomic mass is 35.5. this half number is due to |
| A. | isotopes |
| B. | a half proton |
| C. | a half neutron |
| D. | a half electron |
| Answer» B. a half proton | |
| 50. |
Unit of Planck's constant is |
| A. | Js |
| B. | second |
| C. | minute |
| D. | hourJ |
| Answer» B. second | |