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. |
Transformers are used |
| A. | in DC circuits only |
| B. | in AC circuits only |
| C. | 25 V, 4 amp |
| D. | neither in DC nor in AC circuits |
| Answer» C. 25 V, 4 amp | |
| 2. |
To convert mechanical energy into electrical energy, one can use |
| A. | DC dynamo |
| B. | AC dynamo |
| C. | Speedometer of automobiles |
| D. | [a] & [b] |
| Answer» E. | |
| 3. |
Electroplating does not help in |
| A. | fine finish to the surface |
| B. | shining appearance |
| C. | 200 V, 500 Hz |
| D. | protect metals against corrosion |
| Answer» D. protect metals against corrosion | |
| 4. |
For electroplating a spoon, it is placed in the voltameter at |
| A. | the position of anode |
| B. | the position of cathode |
| C. | 1000 V |
| D. | anywhere in the electrolyte |
| Answer» C. 1000 V | |
| 5. |
In charging a battery of motor car, the following effect of electric current is used |
| A. | magnetic |
| B. | heating |
| C. | 150 |
| D. | induction |
| Answer» D. induction | |
| 6. |
The resistivity of a wire depends on |
| A. | length |
| B. | area of cross-section |
| C. | The vibrations of the primary coil |
| D. | all of these |
| Answer» D. all of these | |
| 7. |
According to international convention of colour coding in a wire |
| A. | live is red, neutral is black and earth is green |
| B. | live is red, neutral is green and earth is black |
| C. | 4 A |
| D. | live is red, neutral is black and earth is green |
| Answer» E. | |
| 8. |
The length of a wire is doubled and the radius is doubled. By what factor does the resistance change? |
| A. | 4 times as large |
| B. | Twice as large |
| C. | 50 |
| D. | Half as large |
| Answer» E. | |
| 9. |
Coulomb's law is true for |
| A. | atomic distances (=\[{{10}^{-11}}m\]) |
| B. | nuclear distances (=\[{{10}^{-15}}m\]) |
| C. | Power |
| D. | all the distances |
| Answer» E. | |
| 10. |
On charging by conduction, mass of a body may |
| A. | increase |
| B. | decreases |
| C. | Obtain a suitable ac voltage |
| D. | none of these |
| Answer» D. none of these | |
| 11. |
If a body is positively charged, then it has |
| A. | excess of electrons |
| B. | excess of protons |
| C. | \[2.9\,\Omega \] |
| D. | deficiency of neutrons |
| Answer» D. deficiency of neutrons | |
| 12. |
Frequency of direct current is |
| A. | Zero |
| B. | Unity |
| C. | (e) 50 Hz |
| D. | infinity |
| Answer» B. Unity | |
| 13. |
Power consumed in a pure inductive circuit is |
| A. | Zero |
| B. | Less |
| C. | High |
| D. | Infinity |
| Answer» B. Less | |
| 14. |
The dielectric material used in variable capacitor is generally |
| A. | Mica |
| B. | Air |
| C. | Ceramic |
| D. | Electrolyte |
| Answer» C. Ceramic | |
| 15. |
Electric pressure is also called |
| A. | Resistance |
| B. | Power |
| C. | Voltage |
| D. | Energy |
| Answer» D. Energy | |
| 16. |
Siemens or Mho \[(\mho )\] is the unit of___? |
| A. | Conductance |
| B. | Admittance |
| C. | Both 1 & 2 |
| D. | None of the above |
| Answer» D. None of the above | |
| 17. |
In case of Short Circuit, ____Current will flow in the Circuit. |
| A. | Zero |
| B. | Very Low |
| C. | Normal |
| D. | Infinite |
| Answer» E. | |
| 18. |
The temperature coefficient of resistance of some material is negative. The material is |
| A. | silicon |
| B. | aluminum |
| C. | arsenide |
| D. | germanium |
| Answer» E. | |
| 19. |
The specific resistance of a wire depends upon |
| A. | its length |
| B. | its cross-sectional area |
| C. | its dimensions |
| D. | its material |
| Answer» E. | |
| 20. |
Electric current is a quantity of |
| A. | scalar |
| B. | vector |
| C. | Both [a] and [b] |
| D. | None of these |
| Answer» B. vector | |
| 21. |
The resistance of a straight conductor does not depend upon its |
| A. | shape of cross-section |
| B. | temperature |
| C. | material |
| D. | length |
| Answer» B. temperature | |
| 22. |
The safe current for the fuse wire of radius r is I, then |
| A. | \[I\,\alpha \,{{r}^{1/2}}\] |
| B. | \[I\,\alpha \,r\] |
| C. | \[I\,\alpha \,{{r}^{3/2}}\] |
| D. | \[I\,\alpha \,{{r}^{2}}\] |
| Answer» D. \[I\,\alpha \,{{r}^{2}}\] | |
| 23. |
Reciprocal of specific resistance is |
| A. | conductive resistance |
| B. | specific conductance |
| C. | specific reactance |
| D. | plate resistance |
| Answer» C. specific reactance | |
| 24. |
The capacity of a spherical conductor is 1 pf then its diameter would be |
| A. | 1.8 m |
| B. | \[1.8\times {{10}^{4}}m\] |
| C. | \[1.8\times {{10}^{3}}m\] |
| D. | \[1.8\times {{10}^{10}}m\] |
| Answer» C. \[1.8\times {{10}^{3}}m\] | |
| 25. |
The energy of a charged capacitor resides in |
| A. | the electric field only |
| B. | the magnetic field only |
| C. | Both the electric and magnetic fields |
| D. | Neither in electric nor magnetic field |
| Answer» D. Neither in electric nor magnetic field | |
| 26. |
In the series combination of two or more than two resistances |
| A. | the current through each resistance is same |
| B. | the voltage through each resistance is same |
| C. | neither current nor voltage through each resistance is same |
| D. | both current and voltage through each resistance are same. |
| Answer» B. the voltage through each resistance is same | |
| 27. |
A current passes through a wire of non-uniform cross section. Which of the following quantities are independent of the cross-section? |
| A. | The charge crossing |
| B. | Drift velocity |
| C. | Current density |
| D. | Free-electron density |
| Answer» E. | |
| 28. |
When no current is passed through a conductor, |
| A. | the free electrons do not move |
| B. | the average speed of a free electron over a large period of time is not zero |
| C. | the average velocity of a free electron over a large period of time is zero |
| D. | the average of the velocities of all the free electrons at an instant is non zero |
| Answer» E. | |
| 29. |
In a current carrying conductor the net charge is |
| A. | \[1.6\times {{10}^{-19}}\]coulomb |
| B. | \[6.25\times {{10}^{-18}}\]coulomb |
| C. | zero |
| D. | infinite |
| Answer» D. infinite | |
| 30. |
Constantan wire is used for making standard resistance, because it has |
| A. | high melting point |
| B. | low specific resistance |
| C. | high specific resistance |
| D. | negligible temperature coefficient of resistance |
| Answer» E. | |
| 31. |
The example of non-ohmic resistance is |
| A. | diode |
| B. | copper wire |
| C. | filament lamp |
| D. | carbon resistor |
| Answer» B. copper wire | |
| 32. |
The unit of specific resistance is |
| A. | \[\Omega \,\,{{m}^{-1}}\] |
| B. | \[{{\Omega }^{-1}}\,\,{{m}^{-1}}\] |
| C. | \[{{\Omega }^{-1}}\] |
| D. | \[2.5\Omega {{m}^{2}}\] |
| Answer» D. \[2.5\Omega {{m}^{2}}\] | |