MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 213 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
Instantaneous voltage is the product of resistance and _____________ current in a resistive circuit. |
| A. | Instantaneous |
| B. | Average |
| C. | RMS |
| D. | Peak |
| Answer» B. Average | |
| 102. |
The power for a purely resistive circuit is zero when? |
| A. | Current is zero |
| B. | Voltage is zero |
| C. | Both current and voltage are zero |
| D. | Either current or voltage is zero |
| Answer» E. | |
| 103. |
Find the value of the instantaneous voltage if the resistance is 2 ohm and the instantaneous current in the circuit is 5A. |
| A. | 5V |
| B. | 2V |
| C. | 10V |
| D. | 2.5V |
| Answer» D. 2.5V | |
| 104. |
A string of five series resistors is connected across a 6 V battery. Zero voltage is measured across all resistors except R3. The voltage across R3 is |
| A. | 0 V |
| B. | 1.2 V |
| C. | 6 V |
| D. | 0.6 V |
| Answer» D. 0.6 V | |
| 105. |
The voltage at one point in a circuit is always measured relative to another point. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 106. |
A series circuit has a 24 V source and a total resistance of 120 Ω. The current through each resistor is |
| A. | 24 mA |
| B. | 200 mA |
| C. | 120 mA |
| D. | 20 mA |
| Answer» C. 120 mA | |
| 107. |
Two 6 V batteries are connected series aiding across two 1.2 kΩ resistors in series. Current through each resistor is |
| A. | 5 mA |
| B. | 10 mA |
| C. | 0 A |
| D. | 2.5 mA |
| Answer» B. 10 mA | |
| 108. |
The following resistors (one each) are connected in a series circuit: 470 Ω, 680 Ω, 1 kΩ, and 1.2 kΩ. The voltage source is 20 V. Current through the 680 Ω resistor is approximately |
| A. | 60 mA |
| B. | 30 mA |
| C. | 6 mA |
| D. | 300 mA |
| Answer» D. 300 mA | |
| 109. |
If a 6 V and a 9 V source are connected series aiding, the total voltage is |
| A. | 6 V |
| B. | 9 V |
| C. | 3 V |
| D. | 15 V |
| Answer» E. | |
| 110. |
If a 24 V and a 6 V battery are series opposing, the total voltage is |
| A. | 30 V |
| B. | 24 V |
| C. | 18 V |
| D. | 0 V |
| Answer» D. 0 V | |
| 111. |
When a fourth resistor is connected in series with three resistors, the total resistance |
| A. | Increases by one-fourth |
| B. | Increases |
| C. | Decreases |
| D. | Remains the same |
| Answer» C. Decreases | |
| 112. |
The total resistance of eight 5.6 kΩ resistors in series is |
| A. | 8 Ω |
| B. | 5,600 Ω |
| C. | 4,480 Ω |
| D. | 44,800 Ω |
| Answer» E. | |
| 113. |
The total resistance of a circuit is 680 Ω. The percentage of the total voltage appearing across a 47 Ω resistor that makes up part of the total series resistance is |
| A. | 68 % |
| B. | 47 % |
| C. | 69 % |
| D. | 6.91 % |
| Answer» E. | |
| 114. |
A series circuit acts as a voltage divider. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 115. |
A series circuit acts as a current divider. |
| A. | True |
| B. | False |
| Answer» C. | |
| 116. |
Which of the following series combinations dissipates the most power when connected across a 120 V source? |
| A. | One 220 Ω resistor |
| B. | Two 220 Ω resistors |
| C. | Three 220 Ω resistors |
| D. | Four 220 Ω resistors |
| Answer» B. Two 220 Ω resistors | |
| 117. |
In a series circuit, the individual powers are additive. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 118. |
Two 1.5 V cells are connected series opposing across two 100 Ω resistors in series. Total current flow is |
| A. | 15 mA |
| B. | 5 mA |
| C. | 2 mA |
| D. | 0 A |
| Answer» E. | |
| 119. |
A certain series circuit consists of a 1/8 W resistor, a 1/4 W resistor, and a 1/2 W resistor. The total resistance is 1200 Ω. If each resistor is operating in the circuit at its maximum power dissipation, total current flow is |
| A. | 27 mA |
| B. | 2.7 mA |
| C. | 19 mA |
| D. | 190 mA |
| Answer» B. 2.7 mA | |
| 120. |
The term 'series opposing' means that sources are in series with opposite polarities. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 121. |
Three 680 Ω resistors are connected in series with a 470 V source. Current in the circuit is |
| A. | 69 mA |
| B. | 230 mA |
| C. | 23 mA |
| D. | 690 mA |
| Answer» C. 23 mA | |
| 122. |
When one of three series resistors is removed from a circuit and the circuit is reconnected, the current |
| A. | Increases |
| B. | Increases by one-third |
| C. | Decreases by one-third |
| D. | Decreases by the amount of current through the removed resistor |
| Answer» B. Increases by one-third | |
| 123. |
The sum of all the voltage drops around a single closed loop in a circuit is zero. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 124. |
There are five resistors in a given series circuit and each resistor has 6 V dropped across it. The source voltage is |
| A. | 6 V |
| B. | Depends on the current flow |
| C. | Depends on the resistor values |
| D. | 30 V |
| Answer» E. | |
| 125. |
The total resistance of a series circuit is equal to the difference between the largest and smallest value resistors. |
| A. | True |
| B. | False |
| Answer» C. | |
| 126. |
Five resistors are connected in a series and there is a current of 3 A into the first resistor. The amount of current into the second resistor is |
| A. | 3 A |
| B. | 1 A |
| C. | 4 A |
| D. | 0.3 A |
| Answer» B. 1 A | |
| 127. |
The total power in a certain circuit is 12 W. Each of the four equal-value series resistors making up the circuit dissipates |
| A. | 12 W |
| B. | 48 W |
| C. | 3 W |
| D. | 8 W |
| Answer» D. 8 W | |
| 128. |
Two resistors are in series: a 5.6 kΩ resistor and a 4.7 kΩ resistor. The voltage drop across the 5.6 kΩ resistor is 10 V. The voltage across the 4.7 kΩ resistor is |
| A. | 8.39 V |
| B. | 10 V |
| C. | 2.32 V |
| D. | 0 V |
| Answer» B. 10 V | |
| 129. |
A series circuit consists of a 4.7 kΩ, a 12 kΩ, and a 2.2 kΩ resistor. The resistor that has the most voltage drop is |
| A. | The 12 kΩ |
| B. | The 2.2 kΩ |
| C. | The 4.7 kΩ |
| D. | Impossible to determine from the given information |
| Answer» B. The 2.2 kΩ | |
| 130. |
To measure the current out of the second resistor in a circuit consisting of four resistors, an ammeter can be placed |
| A. | Between the second and third resistors |
| B. | At the negative terminal of the source |
| C. | Between the third and fourth resistors |
| D. | At any point in the circuit |
| Answer» E. | |
| 131. |
A short in a series circuit prevents current. |
| A. | True |
| B. | False |
| Answer» C. | |
| 132. |
If you know the current anywhere in a series circuit, you know the current everywhere in a series circuit. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 133. |
A series circuit consists of three resistors. Two resistors are 1.2 kΩ each. The total resistance is 12 kΩ. The value of the third resistor is |
| A. | 9,600 Ω |
| B. | 960 Ω |
| C. | 1.2 kΩ |
| D. | Cannot be determined |
| Answer» B. 960 Ω | |
| 134. |
A 12 V battery is connected across a series combination of 68 Ω, 47 Ω, 220 Ω, and 33 Ω. The amount of current is |
| A. | 326 mA |
| B. | 16.3 mA |
| C. | 32.6 mA |
| D. | 163 mA |
| Answer» D. 163 mA | |
| 135. |
A series circuit consists of three resistors with values of 120 Ω, 270 Ω, and 330 Ω. The total resistance is |
| A. | Less than 120 Ω |
| B. | The average of the values |
| C. | 720 Ω |
| D. | 120 Ω |
| Answer» D. 120 Ω | |
| 136. |
‘Series aiding’ is a term sometimes used to describe voltage sources of the same polarity in series. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 137. |
Four equal-value resistors are in series with a 12 V battery and 13.63 mA are measured. The value of each resistor is |
| A. | 22 Ω |
| B. | 220 Ω |
| C. | 880 Ω |
| D. | 88 Ω |
| Answer» C. 880 Ω | |
| 138. |
All the voltage drops and the source voltage added together in a series circuit is equal to |
| A. | The total of the voltage drops |
| B. | The source voltage |
| C. | Zero |
| D. | The total of the source voltage and the voltage drops |
| Answer» D. The total of the source voltage and the voltage drops | |
| 139. |
If four 90 resistors are connected in series across an 18 V source, the current equals ___. |
| A. | 50 mA |
| B. | 0.2 A |
| C. | 0.20833333333333 |
| D. | 20 A |
| Answer» B. 0.2 A | |
| 140. |
A series circuit provides only one path for current between two points. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 141. |
An open in a series circuit will cause maximum voltage across the power supply terminals. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 142. |
In the given circuit, _____ are in series. |
| A. | R1 and R3 |
| B. | R3 and R5 |
| C. | R5 and R7 |
| D. | None of the above |
| Answer» C. R5 and R7 | |
| 143. |
To find the total resistance in series, add the individual resistances. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 144. |
The polarity on the side of the resistor where current enters is ______. The polarity on the side of the resistor where current exits is ___________. |
| A. | positive, positive |
| B. | negative, negative |
| C. | negative, positive |
| D. | positive, negative |
| Answer» D. positive, negative | |
| 145. |
If 7.3 k, 1.8 k, and 4.9 k resistors are wired in series, the total resistance is 14 k. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 146. |
Using a voltage divider the voltage across R1 is 10 V, R2 is 15 V, and R3 is 30 V. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 147. |
To find the total current in series, add the individual currents. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 148. |
In the given circuit, R2 equals _____. |
| A. | 100 k |
| B. | 200 k |
| C. | 300 k |
| D. | More information is needed to find R2. |
| Answer» C. 300 k | |
| 149. |
A short in a series circuit causes the total circuit current to decrease. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 150. |
The voltage across R1 is 10 volts. |
| A. | 1 |
| B. | |
| Answer» C. | |