

MCQOPTIONS
This section includes 50 Mcqs, each offering curated multiple-choice questions to sharpen your Graduate Aptitude Test (GATE) knowledge and support exam preparation. Choose a topic below to get started.
1. |
Which of the following is not an inorganic functional material? |
A. | Ferroelectric |
B. | Reverse micelles |
C. | Magnetic field sensor |
D. | Light detectors |
Answer» C. Magnetic field sensor | |
2. |
What is relative permittivity? |
A. | Equal to the absolute permittivity |
B. | Ratio of actual permittivity to absolute permittivity |
C. | Ratio of absolute permittivity to actual permittivity |
D. | Equal to the actual permittivity |
Answer» C. Ratio of absolute permittivity to actual permittivity | |
3. |
In order to obtain a high value for capacitance, the permittivity of the dielectric medium should be? |
A. | Low |
B. | High |
C. | Zero |
D. | Unity |
Answer» C. Zero | |
4. |
The insulant between the two plates of a capacitor is called _______ |
A. | Conductor |
B. | Semi-conductor |
C. | Dielectric |
D. | Superconductor |
Answer» D. Superconductor | |
5. |
What happens when one material is rubbed against another? |
A. | The material becomes electrically neutral |
B. | The material becomes electrically charged |
C. | The material becomes negatively charged |
D. | The material becomes positively charged |
Answer» C. The material becomes negatively charged | |
6. |
Which, among the following is the correct expression for an electric field? |
A. | E=F/C |
B. | E=F*C |
C. | E=F/Q |
D. | E=F*Q |
Answer» D. E=F*Q | |
7. |
In uniform fields, all points have ________ field strength. |
A. | Zero |
B. | Same |
C. | Infinity |
D. | Different |
Answer» C. Infinity | |
8. |
A field that spreads outwards in all directions is __________ |
A. | Linear |
B. | Radial |
C. | Weak |
D. | Strong |
Answer» C. Weak | |
9. |
Which, among the following, is the field where electric charge experiences a force? |
A. | Electric field |
B. | Magnetic field |
C. | Gravitational field |
D. | Electric, magnetic or gravitational field |
Answer» B. Magnetic field | |
10. |
Which among the following statements is true with regard to electric field lines? |
A. | Electric field lines always intersect |
B. | Electric field lines may or may not intersect |
C. | Electric field lines can be seen |
D. | Electric field lines never intersect |
Answer» E. | |
11. |
Electric field terminates at ________ |
A. | Positive charge |
B. | Negative charge |
C. | Neither positive nor negative |
D. | Both positive and negative |
Answer» C. Neither positive nor negative | |
12. |
Electric field originates at __________ |
A. | Positive charge |
B. | Negative charge |
C. | Neither positive nor negative |
D. | Both positive and negative |
Answer» B. Negative charge | |
13. |
The conventional direction of electric field is ________ |
A. | Positive to negative |
B. | Negative to positive |
C. | No specific direction |
D. | Direction cannot be determined |
Answer» B. Negative to positive | |
14. |
Unit of capacitance is __________ |
A. | Volts |
B. | Farad |
C. | Henry |
D. | Newton |
Answer» C. Henry | |
15. |
What is the value of capacitance of a capacitor which has a voltage of 4V and ha 16C of charge? |
A. | 2F |
B. | 4F |
C. | 6F |
D. | 8F |
Answer» C. 6F | |
16. |
Capacitance decreases with _________ |
A. | Increase in distance between the plates |
B. | Decrease in plate area |
C. | Decrease in distance between the plates |
D. | Increase in density of the material |
Answer» D. Increase in density of the material | |
17. |
Capacitance increases with ______ |
A. | Increase in plate area |
B. | Decrease in plate area |
C. | Increase in distance between the plates |
D. | Increase in density of the material |
Answer» B. Decrease in plate area | |
18. |
Capacitor preferred when there is a high frequency in the circuits is ______ |
A. | Electrolyte capacitor |
B. | Mica capacitor |
C. | Air capacitor |
D. | Glass capacitor |
Answer» C. Air capacitor | |
19. |
A capacitor consists of___________ |
A. | Two conductors |
B. | Two semiconductors |
C. | Two dielectrics |
D. | Two insulators |
Answer» B. Two semiconductors | |
20. |
For very low frequencies, capacitor acts as _______ |
A. | Open circuit |
B. | Short circuit |
C. | Amplifier |
D. | Rectifier |
Answer» B. Short circuit | |
21. |
For high frequencies, capacitor acts as _______ |
A. | Open circuit |
B. | Short circuit |
C. | Amplifier |
D. | Rectifier |
Answer» C. Amplifier | |
22. |
Capacitance is directly proportional to__________ |
A. | Area of cross section between the plates |
B. | Distance of separation between the plates |
C. | Both area and distance |
D. | Neither area nor distance |
Answer» B. Distance of separation between the plates | |
23. |
Which among the following equations is incorrect? |
A. | Q=CV |
B. | Q=C/V |
C. | V=Q/C |
D. | C=Q/V |
Answer» C. V=Q/C | |
24. |
What will happen to the capacitor when the source is removed? |
A. | It will not remain in its charged state |
B. | It will remain in its charged state |
C. | It will start discharging |
D. | It will become zero |
Answer» C. It will start discharging | |
25. |
Unit of capacitance is___________ |
A. | Volts |
B. | Farad |
C. | Henry |
D. | Newton |
Answer» C. Henry | |
26. |
What is the value of capacitance of a capacitor which has a voltage of 4V and ha 8C of charge? |
A. | 2F |
B. | 4F |
C. | 6F |
D. | 8F |
Answer» B. 4F | |
27. |
Air has a dielectric constant of ___________ |
A. | Unity |
B. | Zero |
C. | Infinity |
D. | Hundread |
Answer» B. Zero | |
28. |
Capacitors charge and discharge in __________ manner. |
A. | Linear |
B. | Constant |
C. | Square |
D. | Exponential |
Answer» E. | |
29. |
Calculate the time constant of a series RC circuit consisting of a 100microF capacitor in series with a 100ohm resistor. |
A. | 0.1 sec |
B. | 0.1 msec |
C. | 0.01 sec |
D. | 0.01 msec |
Answer» D. 0.01 msec | |
30. |
When the supply frequency increases, what happens to the capacitive reactance in the circuit? |
A. | Increases |
B. | Decreases |
C. | Remains the same |
D. | Becomes zero |
Answer» C. Remains the same | |
31. |
A power factor of a circuit can be improved by placing which, among the following, in a circuit? |
A. | Inductor |
B. | Capacitor |
C. | Resistor |
D. | Switch |
Answer» C. Resistor | |
32. |
What happens to the capacitance when the voltage across the capacitor increases? |
A. | Decreases |
B. | Increases |
C. | Becomes 0 |
D. | No effect |
Answer» B. Increases | |
33. |
Calculate the capacitance of a capacitor that stores 40microC of charge and has a voltage of 2V. |
A. | 20F |
B. | 20microF |
C. | 10F |
D. | 10microF |
Answer» C. 10F | |
34. |
What happens to the current flow in a fully charged capacitor? |
A. | Current flow stops |
B. | Current flow doubles |
C. | Current flow becomes half its original value |
D. | Current flow becomes one-fourth its original value |
Answer» B. Current flow doubles | |
35. |
When will capacitor fully charged? |
A. | When the voltage across its plates is half the voltage from ground to one of its plates |
B. | When current through the capacitor is a 1/root2 time its value |
C. | When the supply voltage is equal to the capacitor voltage |
D. | Never |
Answer» D. Never | |
36. |
When the voltage across a capacitor increases, what happens to the charge stored in it? |
A. | Increases |
B. | Decreases |
C. | Becomes zero |
D. | Cannot be determined |
Answer» B. Decreases | |
37. |
If one plate of a parallel plate capacitor is charged to positive charge the other plate is charged to? |
A. | Positive |
B. | Negative |
C. | Positive or negative |
D. | Not charged |
Answer» C. Positive or negative | |
38. |
What is the voltage across a capacitor at the time of switching, that is, when t=0? |
A. | Infinity |
B. | Infinity |
C. | Cannot be determined |
D. | 1V |
Answer» C. Cannot be determined | |
39. |
If a 2F capacitor has 1C charge, calculate the voltage across its terminals. |
A. | 0.5V |
B. | 2V |
C. | 1.5V |
D. | 1V |
Answer» C. 1.5V | |
40. |
Which among the following expressions relate charge, voltage and capacitance of a capacitor? |
A. | Q=C/V |
B. | Q=V/C |
C. | Q=CV |
D. | C=Q2V |
Answer» D. C=Q2V | |
41. |
Capacitance decreases with __________ |
A. | Increase in distance between the plates |
B. | Decrease in plate area |
C. | Decrease in distance between the plates |
D. | Increase in density of the material |
Answer» D. Increase in density of the material | |
42. |
Capacitance increases with ________ |
A. | Increase in plate area |
B. | Decrease in plate area |
C. | Increase in distance between the plates |
D. | Increase in distance between the plates |
Answer» B. Decrease in plate area | |
43. |
Capacitor preferred when there is high frequency in the circuits is __________ |
A. | Electrolyte capacitor |
B. | Mica capacitor |
C. | Air capacitor |
D. | Glass capacitor |
Answer» C. Air capacitor | |
44. |
A capacitor consists of_________ |
A. | Two conductors |
B. | Two semiconductors |
C. | Two dielectrics |
D. | Two insulators |
Answer» B. Two semiconductors | |
45. |
For very low frequencies, capacitor acts as ________ |
A. | Open circuit |
B. | Short circuit |
C. | Amplifier |
D. | Rectifier |
Answer» B. Short circuit | |
46. |
For high frequencies, capacitor acts as _________ |
A. | Open circuit |
B. | Short circuit |
C. | Amplifier |
D. | Rectifier |
Answer» C. Amplifier | |
47. |
A 4microF capacitor is charged to 120V, the charge in the capacitor would be? |
A. | 480C |
B. | 480microC |
C. | 30C |
D. | 30microC |
Answer» C. 30C | |
48. |
Calculate the current in the capacitor having 2V supply voltage and 3F capacitance in 2seconds. |
A. | 2A |
B. | 5A |
C. | 6A |
D. | 3A |
Answer» E. | |
49. |
If 2V is supplied to a 3F capacitor, calculate the chance stored in the capacitor. |
A. | 1.5C |
B. | 6C |
C. | 2C |
D. | 3C |
Answer» C. 2C | |
50. |
What is the relation between current and voltage in a capacitor? |
A. | I=1/C*integral(Vdt) |
B. | I=CdV/dt |
C. | I=1/CdV/dt |
D. | I=Ct |
Answer» C. I=1/CdV/dt | |