MCQOPTIONS
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MCQOPTIONS
This section includes 77 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The ___ rating of a resistor will increase with an increase in the surface area of the resistor. |
| A. | resistance |
| B. | current |
| C. | power |
| D. | voltage |
| Answer» D. voltage | |
| 52. |
If current through a resistance is halved |
| A. | the resistance is halved |
| B. | the voltage is halved |
| C. | the voltage doubles |
| D. | none of the above |
| Answer» C. the voltage doubles | |
| 53. |
Energy is defined as the ability to |
| A. | produce heat |
| B. | produce light |
| C. | produce sound |
| D. | All of the above |
| Answer» E. | |
| 54. |
The voltage across a ___ resistor is 12 V and the current through it is 500 A. |
| A. | 600 |
| B. | 2.4 k |
| C. | 6 k |
| D. | 24 k |
| Answer» E. | |
| 55. |
The current through a resistor can be found by dividing the resistor's voltage by its ohmic value. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 56. |
A damaged resistor |
| A. | may appear burned |
| B. | may have an increased resistance value |
| C. | may be checked with an ohmmeter |
| D. | All of the above |
| Answer» E. | |
| 57. |
Generally, increasing the resistance in a circuit will decrease the current. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 58. |
The rate at which work is performed is called |
| A. | current |
| B. | energy |
| C. | power |
| D. | voltage |
| Answer» D. voltage | |
| 59. |
Ohm's law is a relationship between |
| A. | voltage, current, and time |
| B. | power, current, and resistance |
| C. | resistance, time, and current |
| D. | voltage, current, and resistance |
| Answer» E. | |
| 60. |
If voltage across a resistance doubles |
| A. | the current is halved |
| B. | the resistance doubles |
| C. | the current is unchanged |
| D. | none of the above |
| Answer» E. | |
| 61. |
The voltage across a 2.2 k resistor is ___ if 3 mA of current is flowing through it. |
| A. | 6.6 V |
| B. | 7.33 V |
| C. | 1.4 V |
| D. | 0.8 V |
| Answer» B. 7.33 V | |
| 62. |
What is the resistor value in the given circuit? |
| A. | 200 |
| B. | 1 k |
| C. | 2 k |
| D. | 4 k |
| Answer» D. 4 k | |
| 63. |
Current and voltage have a nonlinear relationship. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 64. |
Power supplies differ from batteries in that |
| A. | power supply output voltages are ac and not dc |
| B. | power supply voltages are not stable |
| C. | power supplies are low-current devices |
| D. | None of the above |
| Answer» E. | |
| 65. |
The efficiency rating of a power supply is determined by internal power loss. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 66. |
The power rating for the resistor in the given circuit should be at least ___. |
| A. | 1/4 W |
| B. | 1/2 W |
| C. | 1 W |
| D. | 2 W |
| Answer» C. 1 W | |
| 67. |
What electromotive force would cause 20 A of current to flow through a 500 resistor? |
| A. | 0.04 V |
| B. | 2.5 V |
| C. | 25.0 V |
| D. | 10,000 V |
| Answer» E. | |
| 68. |
Using 4 kWh of power is equivalent to using 2000 W of power for 2 h. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 69. |
If the voltage across a fixed value of resistance is increased five times, what does the current do? |
| A. | It increases by a factor of five. |
| B. | It decreases by a factor of five. |
| C. | It stays the same. |
| D. | Not enough information |
| Answer» B. It decreases by a factor of five. | |
| 70. |
If doubling the voltage across a resistor doubles the current through the resistor then |
| A. | the resistor value decreased |
| B. | the resistor value did not change |
| C. | the resistor value increased |
| D. | it is impossible to determine the change in the resistor value |
| Answer» C. the resistor value increased | |
| 71. |
What is the power in the given circuit? |
| A. | 3.6 W |
| B. | 35 W |
| C. | 175 W |
| D. | 245 W |
| Answer» C. 175 W | |
| 72. |
What is the kilowatt-hour consumption of a 40 W lamp if it remains on for 1750 h? |
| A. | 43.75 |
| B. | 70 |
| C. | 43750 |
| D. | 70000 |
| Answer» C. 43750 | |
| 73. |
If the resistance in a circuit with constant voltage increases, the current will |
| A. | increase |
| B. | decrease |
| C. | stay the same |
| D. | Not enough information |
| Answer» C. stay the same | |
| 74. |
If the voltage in the given circuit was cut in half, what would the current equal? |
| A. | 10 mA |
| B. | 30 mA |
| C. | 60 mA |
| D. | 90 mA |
| Answer» C. 60 mA | |
| 75. |
If the voltage across a resistor ___, the current flowing through it will increase. |
| A. | increases |
| B. | decreases |
| C. | stays the same |
| D. | Not enough information |
| Answer» B. decreases | |
| 76. |
A battery's capacity to deliver power is measured in |
| A. | kWh |
| B. | Ah |
| C. | Wh |
| D. | Vh |
| Answer» C. Wh | |
| 77. |
"Half-splitting" is |
| A. | a means for nuclear fuel cells to produce electricity |
| B. | a means of isolating a problem in a circuit |
| C. | a means for reducing a high ac voltage to a low dc voltage |
| D. | a means of limiting current in a circuit |
| Answer» C. a means for reducing a high ac voltage to a low dc voltage | |