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 magnetic susceptibility of paramagnetic material is: |
| A. | less than zero |
| B. | less than one but positive |
| C. | greater than one |
| D. | equal to zero |
| Answer» C. greater than one | |
| 2. |
Interfacial polarisation of plastics increase their: |
| A. | Magnetic polarisation |
| B. | Permittivity |
| C. | Electrical conductivity |
| D. | Absorption of high frequency power |
| Answer» C. Electrical conductivity | |
| 3. |
Aluminium has a higher atomic packing factor than molybdenum by about 6%. This means that: |
| A. | Aluminium is heavier than molybdenum |
| B. | The ratio of the volume of the unit cell to the volume of the atoms per unit cell is lower in aluminium |
| C. | The ratio of the number of atoms per unit cell to size of the cell is roughly equal to both |
| D. | The distance between atoms are equal for both |
| Answer» C. The ratio of the number of atoms per unit cell to size of the cell is roughly equal to both | |
| 4. |
E |
| A. | increases with temperature |
| B. | is invariant with temperature |
| C. | decreases with temperature |
| D. | All of the above |
| Answer» D. All of the above | |
| 5. |
Silicon steel used for electrical purposes has silicon percentage of: |
| A. | 0.5% |
| B. | 25% |
| C. | 3.4% |
| D. | 12.5% |
| Answer» B. 25% | |
| 6. |
Which of the following contains silicon? |
| A. | Brass |
| B. | Solder |
| C. | Glass |
| D. | Polythene |
| Answer» D. Polythene | |
| 7. |
Lead is widely used in: |
| A. | transformers |
| B. | switchgears |
| C. | galvanised pipes |
| D. | batteries |
| Answer» E. | |
| 8. |
Which of the following is a copper free alloy? |
| A. | Brass |
| B. | Phosphor bronze |
| C. | Invar |
| D. | Muntz metal |
| Answer» D. Muntz metal | |
| 9. |
Hall effect coefficient is: |
| A. | directly proportional to the mobility of the specimen |
| B. | directly proportional to the conductivity of the specimen |
| C. | not applicable to the semiconductors |
| D. | cannot be used to determine the mobility of the specimen |
| Answer» B. directly proportional to the conductivity of the specimen | |
| 10. |
Negative resistance of a tunnel diode: |
| A. | is maximum at the peak point |
| B. | occurs during reverse bias conditions |
| C. | exists between peak and valley points |
| D. | is maximum at valley point |
| Answer» D. is maximum at valley point | |
| 11. |
Volume imperfections can be of the type of: |
| A. | Schottky s defect |
| B. | twin |
| C. | stacking fault |
| D. | noncrystalline regions |
| Answer» E. | |
| 12. |
The imperfections may be minimized by: |
| A. | thermal energy |
| B. | making metal in fibre form |
| C. | surface treatment |
| D. | All of these |
| Answer» B. making metal in fibre form | |
| 13. |
Influence of dislocations on mechanical strength of a crystal is to: |
| A. | increase it |
| B. | keep it uniform |
| C. | decrease it |
| D. | None of these |
| Answer» D. None of these | |
| 14. |
Ideal crystals have: |
| A. | no imperfections |
| B. | only screw dislocations |
| C. | real crystals |
| D. | Frenkel s defect |
| Answer» B. only screw dislocations | |
| 15. |
An undesirable side effect of motional inductance of large conducting specimens is: |
| A. | skin effect |
| B. | hysteresis |
| C. | eddy currents |
| D. | dielectric loss |
| Answer» D. dielectric loss | |
| 16. |
In plasma state a gas: |
| A. | loses electrical conductivity |
| B. | attracts moisture |
| C. | becomes perfect dielectric medium |
| D. | conducts electricity |
| Answer» E. | |
| 17. |
Optical absorption and infrared absorption refer to: |
| A. | dielectric losses |
| B. | anti-ferroelectric behaviour |
| C. | properties of non-polar molecules |
| D. | relaxation time when a. c. field is switched-on |
| Answer» B. anti-ferroelectric behaviour | |
| 18. |
Silicon steel is widely used in: |
| A. | cutting tools |
| B. | dies and punches |
| C. | electrical industry |
| D. | chemical industry |
| Answer» D. chemical industry | |
| 19. |
Insulating materials that can withstand a temperature above 180 C is of: |
| A. | class A type |
| B. | class B type |
| C. | class C type |
| D. | class H type |
| Answer» D. class H type | |
| 20. |
A ferroelectric material exhibits: |
| A. | spontaneous magnetisation |
| B. | hysteresis effect with polarization |
| C. | no spontaneous magnetisation |
| D. | superconducting states |
| Answer» C. no spontaneous magnetisation | |
| 21. |
Piezoelectricity has been observed in: |
| A. | nickel |
| B. | glass |
| C. | quartz |
| D. | mica |
| Answer» D. mica | |
| 22. |
Displacement current in a dielectric primarily depends upon the: |
| A. | resistivity |
| B. | dipole moment |
| C. | frequency of operating field |
| D. | mobility |
| Answer» C. frequency of operating field | |
| 23. |
Which of the following statements are true: |
| A. | 1 and 2 only |
| B. | 3 and 4 only |
| C. | 2 and 3 only |
| D. | 1, 2, 3 and 4 |
| Answer» B. 3 and 4 only | |
| 24. |
Based on the cohesive energy of an ionic solid, which of the following is not a property of the ionic solid? |
| A. | It forms relatively stable and hard crystals |
| B. | It is a poor electric conductor |
| C. | It has a high vaporization temperature |
| D. | None of the above |
| Answer» E. | |
| 25. |
Which one of the theories given below is related to the theory of the thermocouple? |
| A. | Piezoelectric effect |
| B. | Skin effect |
| C. | Seebeck effect |
| D. | Faraday s Law |
| Answer» D. Faraday s Law | |
| 26. |
With respect to a completely filled band, which one of the following statements is correct? |
| A. | The total wave vector and the total velocity of all electrons in the band is always zero |
| B. | The total wave vector and the total velocity of all electrons in the band is not necessarily zero |
| C. | Both (A) and (B) above |
| D. | None of the above |
| Answer» C. Both (A) and (B) above | |
| 27. |
Semiconductor A has a higher band gap than semiconductor B. If both A and B have the same dimensions, the same number of electrons at a given temperature and the same electron and hole mobilities, then: |
| A. | A has the same number of holes as B |
| B. | A has a larger number of holes than B |
| C. | A has less number of holes than B |
| D. | Any of the above statements (A), (B) or (C) could be true |
| Answer» C. A has less number of holes than B | |
| 28. |
A solder is an alloy of: |
| A. | Tin and lead |
| B. | Lead and zinc |
| C. | Zinc and copper |
| D. | Copper and aluminium |
| Answer» B. Lead and zinc | |
| 29. |
Amorphous materials: |
| A. | Glass |
| B. | Silver |
| C. | Lead |
| D. | Zinc |
| Answer» B. Silver | |
| 30. |
Silica gel is used for of air. |
| A. | purification |
| B. | deionization |
| C. | humidification |
| D. | dehumidification |
| Answer» E. | |
| 31. |
Electrical resistances are made from: |
| A. | Elinvar |
| B. | Duralumin |
| C. | Constantan |
| D. | Monel metal |
| Answer» D. Monel metal | |
| 32. |
Which of the following metal has the lowest melting point? |
| A. | Antimony |
| B. | Tin |
| C. | Silver |
| D. | Zinc |
| Answer» C. Silver | |
| 33. |
Which of the following chemical is added to give the blue colour to the glass? |
| A. | Cobalt oxide |
| B. | Manganese dioxide |
| C. | Tin oxide |
| D. | Calcium phosphate |
| Answer» B. Manganese dioxide | |
| 34. |
Polythene is: |
| A. | a polymer of ethylene |
| B. | a vulcanised rubber |
| C. | impregnated cotton |
| D. | cellulose derivative |
| Answer» B. a vulcanised rubber | |
| 35. |
Ferrites are: |
| A. | Ferromagnetic |
| B. | Ferrimagnetic |
| C. | Paramagnetic |
| D. | Antimagnetic |
| Answer» C. Paramagnetic | |
| 36. |
For molybdenum, which has a body-centered cubic lattice structure, the number of atoms per unit cell is: |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 6 |
| Answer» C. 4 | |
| 37. |
The fatigue failure of a material can be avoided by: |
| A. | coating the surface |
| B. | shot peening |
| C. | nitriding |
| D. | any of these |
| Answer» B. shot peening | |
| 38. |
A ductile feature is usually not preceded by: |
| A. | large amount of non-recoverable energy absorption |
| B. | plastic flow |
| C. | deformation |
| D. | noise |
| Answer» E. | |
| 39. |
For a magnetic material when temperature is raised above Curie temperature, the material will become: |
| A. | ferromagnetic |
| B. | paramagnetic |
| C. | diamagnetic |
| D. | semiconductor |
| Answer» C. diamagnetic | |
| 40. |
When the temperature of a semiconductor is reduced to absolute zero? |
| A. | All electrons become free |
| B. | Electrons wave of higher velocities |
| C. | All valence electrons remain in the valence bands |
| D. | All valence electrons shift to forbidden gap |
| Answer» D. All valence electrons shift to forbidden gap | |
| 41. |
Silicon diodes are preferred to germanium diodes for high temperature operation because: |
| A. | doping of silicon is a simple processes |
| B. | rate of increase of reverse saturation current with temperature is more in the case of silicon |
| C. | the reverse saturation current of silicon diodes is smaller than that of germanium |
| D. | silicon diodes can be used to rectify even very small voltage |
| Answer» D. silicon diodes can be used to rectify even very small voltage | |
| 42. |
A high T |
| A. | 400 K |
| B. | 90 K |
| C. | 20 K |
| D. | 4 K |
| Answer» E. | |
| 43. |
The structures which have the highest packing of atoms are: |
| A. | Hexagonal close packed lattice |
| B. | Body centred cubic lattice |
| C. | Simple cubic lattice |
| D. | None of the above |
| Answer» B. Body centred cubic lattice | |
| 44. |
The junction current in a zero biased PN junction, at equilibrium is: |
| A. | due to diffusion of minority carriers |
| B. | due to diffusion of majority carriers |
| C. | due to equal and opposite carriers crossing PN junction |
| D. | zero, because no carrier is able to cross the junction barrier |
| Answer» E. | |
| 45. |
The depletion layer due to PN asymmetric junction: |
| A. | penetrates more into N-region if P content is more |
| B. | penetrates more into P-region if P content is more |
| C. | penetrate equally into both the regions |
| D. | none of these |
| Answer» B. penetrates more into P-region if P content is more | |
| 46. |
The conduction band in a semiconductor is: |
| A. | due to the spreading of energies of free electrons |
| B. | another name for forbidden energy gap |
| C. | at the top of a crystal |
| D. | None of the above |
| Answer» B. another name for forbidden energy gap | |
| 47. |
Tunnel diodes are fabricated from: |
| A. | GaAs |
| B. | Si |
| C. | Ge |
| D. | C |
| Answer» B. Si | |
| 48. |
An example of a metal having zero Thomson effect is: |
| A. | zinc |
| B. | cobalt |
| C. | lead |
| D. | rhodium |
| Answer» D. rhodium | |
| 49. |
Highest electrical resistivity exists in: |
| A. | platinum wire |
| B. | nichrome wire |
| C. | silver wire |
| D. | kanthal wire |
| Answer» E. | |
| 50. |
The principle employed in strain gauge working is: |
| A. | piezoelectric |
| B. | capacitive |
| C. | resistive |
| D. | All of these |
| Answer» B. capacitive | |