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 smallest particle of an element which can take part in any chemical change is known as a/an |
| A. | nucleus |
| B. | atom |
| C. | proton |
| D. | neutron |
| Answer» C. proton | |
| 2. |
A hydrogen atom has an approximate diameter of |
| A. | 10⁻⁹m |
| B. | 10⁻¹⁰m |
| C. | 9⁻¹⁰m |
| D. | 10⁻¹¹m |
| Answer» B. 10⁻¹⁰m | |
| 3. |
The proton number is denoted by the symbol |
| A. | A |
| B. | Z |
| C. | P |
| D. | N |
| Answer» C. P | |
| 4. |
The beam of electrons can be produced with the help of |
| A. | anode-ray tube |
| B. | cathode-ray tube |
| C. | inert-ray tube |
| D. | bi-charged-ray tube |
| Answer» C. inert-ray tube | |
| 5. |
Difference in values of energy of electron increases from |
| A. | lower to higher orbits |
| B. | higher to lower orbits |
| C. | same orbits |
| D. | higher to more higher orbits |
| Answer» C. same orbits | |
| 6. |
Number of degenerate orbitals in s-sub shell are |
| A. | two |
| B. | four |
| C. | one |
| D. | zero |
| Answer» E. | |
| 7. |
Model of atoms which was proposed by Rutherford was |
| A. | circular path |
| B. | cylindrical |
| C. | planetary |
| D. | oval |
| Answer» D. oval | |
| 8. |
By exposure of electrons beams on atoms and observing their behavior upon the fall of the beam can help to determine |
| A. | charge |
| B. | weight |
| C. | length |
| D. | volume |
| Answer» B. weight | |
| 9. |
Dual nature of matter was experimentally verified by striking electron on |
| A. | platinum crystal |
| B. | nickel crystal |
| C. | steel |
| D. | cadmium |
| Answer» C. steel | |
| 10. |
Spectrum of hydrogen is obtained at |
| A. | low pressure |
| B. | high pressure |
| C. | very low pressure |
| D. | high temperature |
| Answer» D. high temperature | |
| 11. |
Planck's theory was given by |
| A. | Edward Planck |
| B. | Max Planck |
| C. | Merlin Planck |
| D. | John Planck |
| Answer» C. Merlin Planck | |
| 12. |
Elements employed by Moseley for production of X-rays were |
| A. | twenty eight |
| B. | forty eight |
| C. | fifty eight |
| D. | thirty eight |
| Answer» E. | |
| 13. |
The regular arrangement in which atoms are closely packed together is called a |
| A. | lattice |
| B. | crystal lattice |
| C. | tetrahedral structure |
| D. | octahedral structure |
| Answer» B. crystal lattice | |
| 14. |
Blue color has wavelength between |
| A. | 400-900nm |
| B. | 430-480nm |
| C. | 500-600nm |
| D. | 200-300nm |
| Answer» C. 500-600nm | |
| 15. |
Rainbow is obtained from light of |
| A. | sun |
| B. | moon |
| C. | planets |
| D. | stars |
| Answer» B. moon | |
| 16. |
Another name for orbital is |
| A. | electron |
| B. | electronic cloud |
| C. | energy |
| D. | proton cloud |
| Answer» C. energy | |
| 17. |
Orbital motion was described in elliptical form by |
| A. | Bohr |
| B. | Sommerfeld |
| C. | Rutherford |
| D. | J Thomson |
| Answer» C. Rutherford | |
| 18. |
Spectrum of X Rays include |
| A. | c series |
| B. | f series |
| C. | K series |
| D. | B series |
| Answer» D. B series | |
| 19. |
Wavelength of alpha particle is smaller as compared to electron about |
| A. | 1836 times |
| B. | 7344 times |
| C. | 90 times |
| D. | 1000 times |
| Answer» C. 90 times | |
| 20. |
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 | |
| 21. |
Other source of rainbow other than sun is |
| A. | incandescent solids |
| B. | soft solids |
| C. | liquids |
| D. | gases |
| Answer» B. soft solids | |
| 22. |
Atomic spectrum is also produced by heating of elements in |
| A. | solid state |
| B. | liquid state |
| C. | gaseous state |
| D. | plasma |
| Answer» D. plasma | |
| 23. |
The number of protons and the number of electrons are always equal in |
| A. | neutral atom |
| B. | molecules |
| C. | ions |
| D. | compounds |
| Answer» B. molecules | |
| 24. |
Uncertainty principle can be easily understandable with help of |
| A. | Dalton's effect |
| B. | Compton's effect |
| C. | electron effect |
| D. | rhombic effect |
| Answer» C. electron effect | |
| 25. |
Metallic bonding is very strong because of |
| A. | lattice |
| B. | volatility |
| C. | electrostatic attraction |
| D. | none of above |
| Answer» D. none of above | |
| 26. |
Lobes of d-orbitals which lie between axis are |
| A. | first three |
| B. | last three |
| C. | last two |
| D. | only first |
| Answer» B. last three | |
| 27. |
Rutherford performed his experiment in |
| A. | 1934 |
| B. | 1911 |
| C. | 1945 |
| D. | 1989 |
| Answer» C. 1945 | |
| 28. |
Color of fluorescence produced by cathode rays in glass tube is |
| A. | purplish |
| B. | greenish |
| C. | maroon |
| D. | yellow |
| Answer» C. maroon | |
| 29. |
Discovery of protons was commenced in year |
| A. | 1889 |
| B. | 1880 |
| C. | 1878 |
| D. | 1896 |
| Answer» E. | |
| 30. |
Carbon-12 is chosen as standard atom because |
| A. | it is found in most organic compounds |
| B. | it is decomposable in nature |
| C. | the mass of 12 units has been measured very accurately |
| D. | Carbon is the most common element |
| Answer» D. Carbon is the most common element | |
| 31. |
Another scientist with Davison to show dual nature of matter was |
| A. | Rutherford |
| B. | Bohr |
| C. | Germer |
| D. | de Broglie |
| Answer» D. de Broglie | |
| 32. |
Energy released in discharge tube when electrons are stopped is in form of |
| A. | magnetic waves |
| B. | electric waves |
| C. | electromagnetic waves |
| D. | hydro waves |
| Answer» D. hydro waves | |
| 33. |
The removal of electrons one by one from an atom by a specific sequence of ionization energies are termed as |
| A. | successive ionization energies |
| B. | successive ionization changes |
| C. | successive ionization replacement |
| D. | ionization |
| Answer» B. successive ionization changes | |
| 34. |
Letter 'f' in azimuthal quantum number represents |
| A. | fundamental |
| B. | friction |
| C. | force |
| D. | first |
| Answer» B. friction | |
| 35. |
Charge on proton is positive whose value in coulomb is |
| A. | x10-27 |
| B. | x10-27 |
| C. | x10-19 |
| D. | x10-27 |
| Answer» D. x10-27 | |
| 36. |
Protons are deflected from anode which reveals their |
| A. | positive charge |
| B. | negative charge |
| C. | neutral charge |
| D. | zero charge |
| Answer» B. negative charge | |
| 37. |
Potential energy of electron system is zero at |
| A. | near nucleus |
| B. | first orbit |
| C. | last orbit |
| D. | infinity |
| Answer» E. | |
| 38. |
Wavelength of ultraviolet rays is from |
| A. | 10-400nm |
| B. | 789-890nm |
| C. | 456-567nm |
| D. | 890nm-789nm |
| Answer» B. 789-890nm | |
| 39. |
Delta x is related to delta p |
| A. | directly |
| B. | inversely |
| C. | adversely |
| D. | proportionally |
| Answer» C. adversely | |
| 40. |
Rutherford in his experiment used |
| A. | alpha particles |
| B. | beta particles |
| C. | gamma particles |
| D. | zeta particles |
| Answer» B. beta particles | |
| 41. |
Energy change due to acceptance of one electron (e⁻) by gaseous non-metal atom is |
| A. | atomization |
| B. | gaseous |
| C. | moles |
| D. | electron affinity |
| Answer» E. | |
| 42. |
Valence electrons are used to get a clue of |
| A. | Group Number |
| B. | Shell Number |
| C. | Period Number |
| D. | Proton Number |
| Answer» B. Shell Number | |
| 43. |
If ethanol will be used in the elimination reaction of Halogenoalkanes it will produce |
| A. | alkanes |
| B. | alkenes |
| C. | ketone |
| D. | carbonyl |
| Answer» C. ketone | |
| 44. |
Successive electron (e⁻) affinities must be used when element forms an ion with more than one |
| A. | ion |
| B. | negative charge |
| C. | positive charge |
| D. | neutron |
| Answer» C. positive charge | |
| 45. |
What is true about metal atoms? |
| A. | they lose their outer electrons only |
| B. | they become positively charged only |
| C. | they become negatively charged |
| D. | they lose their outer electrons and become positively charged |
| Answer» E. | |
| 46. |
Which statement is incorrect? Along a column in Inert gases (He, Ar, Kr, Ne, Xe, Ra) |
| A. | number of electrons increases |
| B. | enthalpy change of vaporization increases |
| C. | boiling points of noble gases decreases |
| D. | melting point of noble gas increases |
| Answer» D. melting point of noble gas increases | |
| 47. |
Down the group the electrical conductivity |
| A. | increases |
| B. | decreases |
| C. | same |
| D. | constant |
| Answer» B. decreases | |
| 48. |
Unit picometer is actually |
| A. | 10^-9 meter |
| B. | 10^-8m |
| C. | 10^-12m |
| D. | 10^-5m |
| Answer» D. 10^-5m | |
| 49. |
Mass of an electron is |
| A. | 1⁄1840 of a proton |
| B. | 1⁄1840 of a neutron |
| C. | 1840 times of a proton |
| D. | both a and b |
| Answer» E. | |
| 50. |
Speed of electron is faster in |
| A. | smaller orbits |
| B. | larger orbits |
| C. | middle orbits |
| D. | speed remains same |
| Answer» B. larger orbits | |