MCQOPTIONS
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MCQOPTIONS
This section includes 114 Mcqs, each offering curated multiple-choice questions to sharpen your 12th knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In a circuita an active element is one which |
| A. | Supplies energy |
| B. | Receives energy |
| C. | Both supplies and receives energy |
| D. | Amplifies signal |
| Answer» B. Receives energy | |
| 2. |
Which of the following dielectric materials makes the highest-capacitance capacitor? |
| A. | Air |
| B. | Barium-strontium titanite |
| C. | Mica |
| D. | Electrolyte |
| Answer» C. Mica | |
| 3. |
The Q-factor of a series resonant circuit is also known as |
| A. | Current magnification factor |
| B. | Voltage magnification factor |
| C. | Load factor |
| D. | Leakage factor |
| Answer» C. Load factor | |
| 4. |
The Q-factor of a parallel resonant circuit is also known as |
| A. | Current magnification factor |
| B. | Voltage magnification factor |
| C. | Load factor |
| D. | Leakage factor |
| Answer» B. Voltage magnification factor | |
| 5. |
The potential gradient in a cable is maximum in |
| A. | Conductor |
| B. | Outer sheath |
| C. | Insulation |
| D. | Uniformly all over |
| Answer» B. Outer sheath | |
| 6. |
What is the complex impedance of a circuit with an absolute resistance of 300 ? |
| A. | 0 + j 300 |
| B. | 300 + j 90 |
| C. | 0 � j 300 |
| D. | 300 +j 0 |
| Answer» E. | |
| 7. |
Which of the following elements is active? |
| A. | Resistor |
| B. | Inductor |
| C. | Capacitor |
| D. | Ideal voltage source |
| Answer» E. | |
| 8. |
Which of the statements below is not true? |
| A. | Current source is an active element |
| B. | Resistor is a linear element |
| C. | Voltage source is a passive element |
| D. | Diode is a non-linear element |
| Answer» D. Diode is a non-linear element | |
| 9. |
The ohmic value of a resistor with negative temperature coefficient |
| A. | Increases with increasing temperature |
| B. | Increase with decreasing temperature |
| C. | Stays unchanged with temperature change |
| D. | Stays unaffected even with increasing temperature |
| Answer» C. Stays unchanged with temperature change | |
| 10. |
In a pure capacitancea |
| A. | Current leads voltage by 90� |
| B. | Current leads voltage by 180� |
| C. | Current lags voltage by 90� |
| D. | Current lags voltage by 180� |
| Answer» B. Current leads voltage by 180� | |
| 11. |
In an RL series circuita |
| A. | Current lags voltage by less than 90� |
| B. | Current lags voltage by 180� |
| C. | Current lags voltage by 90� |
| D. | Current leads voltage by 90� |
| Answer» B. Current lags voltage by 180� | |
| 12. |
At parallel resonancea the currents flowing through L and C are |
| A. | Infinite |
| B. | Zero |
| C. | Unequal |
| D. | Equal |
| Answer» E. | |
| 13. |
A law which states that when a constant electromotive force is applied to a circuit consisting of a resistor and capacitor connected in seriesa the time taken for the potential on the plates of the capacitor to rise to any given fraction of its final value depends only on the product of capacitance and resistance. |
| A. | Child�s law |
| B. | CR law |
| C. | Coulomb�s law |
| D. | Debye T3 law |
| Answer» C. Coulomb�s law | |
| 14. |
An alloy composed of 84 % coppera 12 % manganese and 4 % nickel. |
| A. | Manganin |
| B. | Constantan |
| C. | Nichrome |
| D. | German silver wire |
| Answer» B. Constantan | |
| 15. |
A factor that states how much the resistance changes for a change in temperature? |
| A. | Resistivity |
| B. | Specific resistance |
| C. | Coefficient of temperature change |
| D. | Temperature coefficient of resistance |
| Answer» E. | |
| 16. |
What refers to such work at very low temperaturesa near absolute zero? |
| A. | Cryogenics |
| B. | Superconductivity |
| C. | Subsonic |
| D. | Thermionic |
| Answer» B. Superconductivity | |
| 17. |
The superposition theorem is used when the circuit contains |
| A. | Reactive elements |
| B. | Active elements |
| C. | Number of voltage sources |
| D. | Single voltage source |
| Answer» D. Single voltage source | |
| 18. |
Which of the following is not a factor affecting dielectric strength? |
| A. | Mass |
| B. | Moisture content |
| C. | Temperature |
| D. | Thickness |
| Answer» B. Moisture content | |
| 19. |
Which component opposes voltage change? |
| A. | Resistor |
| B. | Inductor |
| C. | Capacitor |
| D. | Transistor |
| Answer» D. Transistor | |
| 20. |
The farad is not equivalent to which of the following combination of units |
| A. | CV2 |
| B. | C2/J |
| C. | C/V |
| D. | J/V2 |
| Answer» B. C2/J | |
| 21. |
The unit of elastance is |
| A. | Farad |
| B. | Daraf |
| C. | Siemen |
| D. | Henry |
| Answer» C. Siemen | |
| 22. |
Voltage resonance means |
| A. | Series resonance |
| B. | Parallel resonance |
| C. | Current magnification |
| D. | Gain magnification |
| Answer» B. Parallel resonance | |
| 23. |
Leakage resistance in a capacitor results into |
| A. | Internal heating |
| B. | Internal bleeding |
| C. | Shorter useful life |
| D. | Short-circuiting |
| Answer» B. Internal bleeding | |
| 24. |
In an ac circuit with XL and R in seriesa the |
| A. | Voltages across R and XL are in phase |
| B. | Voltage across R lags the voltage across XLby 90� |
| C. | Voltages across R and XL are 180� outof-phase |
| D. | Voltage across R leads the voltage across XLby 90� |
| Answer» C. Voltages across R and XL are 180� outof-phase | |
| 25. |
In an ac circuit with a resistive branch and an inductive branch in parallela the |
| A. | Voltage across the inductance leads the voltage across the resistance by 90� |
| B. | Resistive branch current is 90� out of phase with the inductive branch current |
| C. | Resistive and inductive branch currents have the same phase |
| D. | Resistive and inductive branch currents are 180� outof-phase |
| Answer» C. Resistive and inductive branch currents have the same phase | |
| 26. |
Two complex numbers or phasors are said to be conjugate if they |
| A. | Differ only in the algebraic sign of their quadratic components |
| B. | Differ only in the algebraic sign of their real components |
| C. | Are equal in their real and quadrature components including alge |
| D. | Are equal in their real components but differ in their quadrature components i ncluding algebraic signs. |
| Answer» B. Differ only in the algebraic sign of their real components | |
| 27. |
In an inductive coila the rate of rise of current is maximum |
| A. | Near the final maximum value of current |
| B. | At midvalue of current |
| C. | At half-power points |
| D. | After one time constant |
| Answer» B. At midvalue of current | |
| 28. |
A capacitor is basically constructed of |
| A. | Two conductors separated by a dielectric |
| B. | Two dielectric separated by a conductor |
| C. | Conductors and dielectric |
| D. | Conductors and semiconductors |
| Answer» B. Two dielectric separated by a conductor | |
| 29. |
An inductance of 1 mH is |
| A. | 0.001 H |
| B. | 0.01 H |
| C. | 0.0001 H |
| D. | 0.10 H |
| Answer» B. 0.01 H | |
| 30. |
If three 100-pF capacitors are connected in seriesa then the total capacitance is |
| A. | 300 pF |
| B. | 100 pF |
| C. | 50 pF |
| D. | 33.3 pF |
| Answer» E. | |
| 31. |
The internal resistance of an ideal current source is |
| A. | Infinite |
| B. | Zero |
| C. | Equal to the load resistance |
| D. | To be determined |
| Answer» B. Zero | |
| 32. |
�Any resistance R in a branch of a network in which a current I is flowing can be replaced by a voltage equal to IR�. This states |
| A. | Compensation theorem |
| B. | Reciprocity theorem |
| C. | Millman�s theorem |
| D. | Superposition theorem |
| Answer» B. Reciprocity theorem | |
| 33. |
For a series circuita the higher the quality factor |
| A. | The greater the bandwidth |
| B. | The narrower the passband |
| C. | The broader the resonance curve |
| D. | The wider the passband |
| Answer» C. The broader the resonance curve | |
| 34. |
The reactance curve is a plot of frequency versus _____ for a series RLCcircuit |
| A. | Current |
| B. | Voltage |
| C. | Gain |
| D. | Impedance |
| Answer» B. Voltage | |
| 35. |
The charge in the capacitor is stored at the |
| A. | Terminals |
| B. | Plates |
| C. | Dielectric |
| D. | Air |
| Answer» C. Dielectric | |
| 36. |
The voltage cannot be exactly in phase with the current in a circuit that contains |
| A. | Only capacitance |
| B. | Only resistance |
| C. | Inductance and capacitance |
| D. | Inductancea capacitance and resistance |
| Answer» B. Only resistance | |
| 37. |
A capacitance of 6 ��F means |
| A. | 6 pF |
| B. | 6 nF |
| C. | 6 fF |
| D. | 6 aF |
| Answer» B. 6 nF | |
| 38. |
And ideal current source has an internal conductance of _____ siem |
| A. | Infinite |
| B. | One |
| C. | Zero |
| D. | One million |
| Answer» D. One million | |
| 39. |
What is the resonant frequency of a circuit when L of 25 microhenrys and C of 10 picofarads are in parallel? |
| A. | 10.1 kHz |
| B. | 10.1 MHz |
| C. | 101 MHz |
| D. | 101 kHz |
| Answer» C. 101 MHz | |
| 40. |
Which of the following does not refer to electrical energy? |
| A. | Volt-ampere |
| B. | Joule |
| C. | Watt-second |
| D. | Volt-coulomb |
| Answer» B. Joule | |
| 41. |
Which of the following is the most popular waveform? |
| A. | Sinusoidal |
| B. | Sinusoidal |
| C. | Triangular |
| D. | Sawtooth |
| Answer» B. Sinusoidal | |
| 42. |
The graph between an alternating quantity and time is called |
| A. | Sine wave |
| B. | Curve |
| C. | Waveform |
| D. | A plot |
| Answer» D. A plot | |
| 43. |
A trigger circuit consisting of a capacitor of 0.01 F is connected in series with a resistor. If the circuit requires 100 Vdcto operatea determine the value of the resistor when time constant is 0.009s. |
| A. | 900 k |
| B. | 900 M |
| C. | 900 G |
| Answer» C. 900 G | |
| 44. |
Which of the following is not considered a physical factor affecting resistance? |
| A. | Length |
| B. | Material type |
| C. | Temperature |
| D. | Cross-sectional |
| Answer» D. Cross-sectional | |
| 45. |
Which of the following does not affect resistance? |
| A. | Resistivity |
| B. | Cross-sectional area |
| C. | Mass |
| D. | Length |
| Answer» D. Length | |
| 46. |
The reason why electrical appliances are connected in parallel. |
| A. | It is a simple circuit |
| B. | This makes the operation of appliances independent with each other |
| C. | C This results in reduced power consumption |
| D. | All of the above |
| Answer» C. C This results in reduced power consumption | |
| 47. |
What determines the direction of induced emf in a conductor or coil? |
| A. | Cork screw rule |
| B. | Fleming�s left hand rule |
| C. | Ampere�s circuital law |
| D. | Fleming�s right hand rule |
| Answer» E. | |
| 48. |
Loop currents should be assumed to flow in which direction |
| A. | Straight |
| B. | Clockwise |
| C. | Counter-clockwise |
| D. | Either B or C arbitrarily selected |
| Answer» E. | |
| 49. |
The impedance in the study of electronics is represented by resistan |
| A. | Inductance |
| B. | Capacitance |
| C. | Inductance and capacitance |
| D. | Reactance |
| Answer» E. | |
| 50. |
Permeability is otherwise known as |
| A. | Magnetic conductivity |
| B. | Magnetic susceptibility |
| C. | Electric conductivity |
| D. | Electric susceptibility |
| Answer» B. Magnetic susceptibility | |