Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

PHY 114 > Chot 5 DC Circuits And Instrument > Flashcards

Chot 5 DC Circuits And Instrument Flashcards

1
Q

QUESTION

A

OPTION 1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q
  1. (What is the current in a DC circuit? A. Steady and does not change with time B. Alternating and periodic C. Increases exponentially with time D. Decreases linearly over time)
A

Answer: A. Steady and does not change with time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q
  1. (Which symbol represents a resistor in a circuit diagram? A. Zigzag line B. Straight line C. Two parallel lines D. Circle with a cross)
A

Answer: A. Zigzag line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q
  1. (Resistors are in series when: A. The same current passes through each B. They are connected to separate power sources C. Different currents flow through each D. They are connected in parallel branches)
A

Answer: A. The same current passes through each

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q
  1. (The equivalent resistance for resistors in series is: A. The sum of all resistances B. The product of all resistances C. The reciprocal of the sum of reciprocals D. Always equal to zero)
A

Answer: A. The sum of all resistances

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q
  1. (For resistors in parallel, the equivalent resistance is: A. The reciprocal of the sum of reciprocals of individual resistances B. The sum of all resistances C. Greater than the largest individual resistance D. Equal to the smallest resistance)
A

Answer: A. The reciprocal of the sum of reciprocals of individual resistances

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q
  1. (The sum of voltage drops across resistors in series equals: A. The total voltage applied B. Zero C. Twice the total voltage applied D. Half the total voltage applied)
A

Answer: A. The total voltage applied

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q
  1. (When two resistors are connected in parallel: A. The same voltage exists across both resistors B. The same current flows through both resistors C. The resistors have equal resistance D. The total resistance doubles)
A

Answer: A. The same voltage exists across both resistors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q
  1. (A circuit element with negligible resistance is represented as: A. Straight line B. Zigzag line C. Circle with a cross D. Two parallel lines)
A

Answer: A. Straight line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q
  1. (If three resistors and are in series, the total resistance is: A. B. C. D. Zero)
A

Answer: A.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q
  1. (In parallel circuits, the total current is: A. The sum of currents through each branch B. Equal to the current through one branch C. Zero D. Always constant)
A

Answer: A. The sum of currents through each branch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q
  1. (For resistors in series, the total current is: A. The same through all resistors B. Different in each resistor C. Zero D. Dependent on resistance)
A

Answer: A. The same through all resistors

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q
  1. (The equivalent resistance of resistors in parallel is always: A. Less than the smallest resistor B. Equal to the largest resistor C. Equal to the sum of all resistors D. Greater than the largest resistor)
A

Answer: A. Less than the smallest resistor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q
  1. (A 10 Ω resistor is connected to a 240 V source. The current is: A. A B. A C. A D. A)
A

Answer: A.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q
  1. (Kirchhoff’s first rule is based on: A. Conservation of charge B. Conservation of energy C. Ohm’s law D. Magnetic flux)
A

Answer: A. Conservation of charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q
  1. (Kirchhoff’s second rule states: A. Sum of potential drops equals the sum of emfs B. Current is constant across all loops C. Resistance is inversely proportional to current D. Voltage remains constant)
A

Answer: A. Sum of potential drops equals the sum of emfs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q
  1. (In a closed loop, the potential drop IR is: A. Positive if the current flows in the chosen direction B. Always negative C. Independent of direction D. Zero)
A

Answer: A. Positive if the current flows in the chosen direction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q
  1. (What is the equivalent resistance of two 10 Ω resistors in parallel? A. B. C. D. )
A

Answer: A.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q
  1. (The unit of resistance is: A. Ohm (Ω) B. Ampere (A) C. Volt (V) D. Farad (F))
A

Answer: A. Ohm (Ω)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q
  1. (When resistors are connected in series: A. Adding more resistors increases the total resistance B. Total resistance decreases C. Voltage remains constant across all resistors D. Current is different across resistors)
A

Answer: A. Adding more resistors increases the total resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q
  1. (A circuit where current splits into branches is: A. Parallel B. Series C. Open D. Shorted)
A

Answer: A. Parallel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q
  1. (Which law governs the flow of current into and out of a junction? A. Kirchhoff’s first rule B. Kirchhoff’s second rule C. Ohm’s law D. Coulomb’s law)
A

Answer: A. Kirchhoff’s first rule

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q
  1. (Kirchhoff’s second rule applies to: A. Closed loops B. Open circuits C. Single resistors D. Capacitors)
A

Answer: A. Closed loops

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q
  1. (The total resistance of three resistors , , and in series is: A. B. C. D. )
A

Answer: A.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q
  1. (In a circuit, the emf of a battery is: A. The driving voltage B. Resistance C. Current D. Power)
A

Answer: A. The driving voltage

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q
  1. (What happens to the total resistance if more resistors are added in parallel? A. Decreases B. Increases C. Remains constant D. Doubles)
A

Answer: A. Decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q
  1. (Kirchhoff’s laws are used to analyze: A. Complex circuits B. Single-path circuits C. Magnetic fields D. Inductors)
A

Answer: A. Complex circuits

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q
  1. (The reciprocal of equivalent resistance in parallel is equal to: A. The sum of reciprocals of individual resistances B. The product of all resistances C. The sum of all resistances D. Zero)
A

Answer: A. The sum of reciprocals of individual resistances

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q
  1. (The direction of current in a branch is: A. Assumed for analysis and verified later B. Always clockwise C. Determined only experimentally D. Independent of potential difference)
A

Answer: A. Assumed for analysis and verified later

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q
  1. (In a parallel circuit with equal resistors, the current in each resistor is: A. Equal if voltage is constant B. Zero C. Different D. Half the total current)
A

Answer: A. Equal if voltage is constant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q
  1. (What does the negative sign in current indicate in a DC circuit? a) Opposite direction of current flow b) Accurate current magnitude c) Positive direction of flow d) Resistance magnitude)
A

Answer: a) Opposite direction of current flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q
  1. (What is the primary function of an ammeter? a) Measure current b) Measure voltage c) Measure resistance d) Measure capacitance)
A

Answer: a) Measure current

33
Q
  1. (Which type of resistance is essential for an ammeter? a) Low resistance b) High resistance c) Medium resistance d) Variable resistance)
A

Answer: a) Low resistance

34
Q
  1. (What type of instrument is used to measure potential differences? a) Voltmeter b) Ammeter c) Galvanometer d) Potentiometer)
A

Answer: a) Voltmeter

35
Q
  1. (What is the typical resistance of the coil in a galvanometer? a) 10–100 Ω b) 1–10 kΩ c) 5–50 mΩ d) 50–100 kΩ)
A

Answer: a) 10–100 Ω

36
Q
  1. (What component is added in parallel to a galvanometer to convert it into an ammeter? a) Shunt resistance b) High-resistance multiplier c) Potentiometer d) Transformer)
A

Answer: a) Shunt resistance

37
Q
  1. (What is the main characteristic of a voltmeter? a) High resistance b) Low resistance c) Series connection requirement d) Measures current directly)
A

Answer: a) High resistance

38
Q
  1. (How is a galvanometer converted into a voltmeter? a) Adding a high resistance in series b) Adding a low resistance in series c) Connecting a capacitor across it d) Using an external transformer)
A

Answer: a) Adding a high resistance in series

39
Q
  1. (What does the time constant (τ) in an RC circuit represent? a) Time for the capacitor to charge to 63% b) Time for the current to reach maximum c) Total resistance of the circuit d) Energy storage capacity)
A

Answer: a) Time for the capacitor to charge to 63%

40
Q
  1. (What does the Wheatstone bridge measure? a) Resistance b) Voltage c) Current d) Capacitance)
A

Answer: a) Resistance

41
Q
  1. (In the Wheatstone bridge, what condition signifies balance? a) No current through the galvanometer b) Equal resistances in all arms c) Infinite voltage across the battery d) Zero resistance in the circuit)
A

Answer: a) No current through the galvanometer

42
Q
  1. (In a potentiometer, what parameter is constant along the wire? a) Current b) Resistance c) Voltage d) Capacitance)
A

Answer: c) Voltage

43
Q
  1. (What is the main advantage of a potentiometer over a moving coil voltmeter? a) Elimination of internal resistance errors b) Direct measurement of resistance c) Compact size d) Reduced sensitivity)
A

Answer: a) Elimination of internal resistance errors

44
Q
  1. (What is the role of a multiplier in a multi-range voltmeter? a) Extends measurement range b) Decreases sensitivity c) Reduces resistance d) Prevents overheating)
A

Answer: a) Extends measurement range

45
Q
  1. (In an RC circuit, what happens to the current as the capacitor charges? a) Decreases over time b) Remains constant c) Increases exponentially d) Oscillates periodically)
A

Answer: a) Decreases over time

46
Q
  1. (How can the e.m.f. of two cells be compared using a potentiometer? a) Measuring their balance points b) Calculating current flow c) Observing their terminal voltages d) Using a Wheatstone bridge)
A

Answer: a) Measuring their balance points

47
Q
  1. (In a meter bridge, what corresponds to the balance point? a) Ratio of resistances b) Voltage across terminals c) Current in the wire d) Length of wire)
A

Answer: a) Ratio of resistances

48
Q
  1. (What is the primary application of the meter bridge? a) Measure unknown resistances b) Compare voltage sources c) Store electric energy d) Generate alternating current)
A

Answer: a) Measure unknown resistances

49
Q
  1. (What does the galvanometer indicate in the Wheatstone bridge? a) Balance point b) Maximum current flow c) Voltage drop d) Inductive reactance)
A

Answer: a) Balance point

50
Q
  1. (What is the significance of the constant (k) in a potentiometer? a) Relates e.m.f to wire length b) Represents the resistance per unit length c) Measures the accuracy of the device d) Balances the voltage sources)
A

Answer: a) Relates e.m.f to wire length

51
Q
  1. (What happens when τ in an RC circuit? a) Charge reaches 63% of maximum value b) Current is at its peak c) Voltage across capacitor is zero d) Energy in the circuit doubles)
A

Answer: a) Charge reaches 63% of maximum value

52
Q
  1. (What is the primary function of a multi-meter? a) Measure current, voltage, and resistance b) Store charge c) Generate high voltages d) Compare e.m.f of cells)
A

Answer: a) Measure current, voltage, and resistance

53
Q
  1. (What is the maximum charge a capacitor can hold in an RC circuit? a) Q = C × V b) Q = I × t c) Q = 1/2 × C × V² d) Q = 1/2 × I × t²)
A

Answer: a) Q = C × V

54
Q
  1. (What kind of resistance does the capacitor encounter during charging? a) Constant resistance of the resistor b) Varying resistance from the battery c) Inductive reactance d) Zero resistance)
A

Answer: a) Constant resistance of the resistor

55
Q
  1. (In the RC circuit, how is the charge (Q) related to time (t)? a) Q = Q₀(1 - e^(-t/τ)) b) Q = Q₀e^(t/τ) c) Q = V × t d) Q = V × C)
A

Answer: a) Q = Q₀(1 - e^(-t/τ))

56
Q
  1. (Which instrument measures small e.m.f. more accurately? a) Potentiometer b) Ammeter c) Voltmeter d) Galvanometer)
A

Answer: a) Potentiometer

57
Q
  1. (In a charging capacitor, what happens to the current at t = τ? a) It becomes zero b) It reaches maximum c) It oscillates d) It decreases to a minimum)
A

Answer: a) It becomes zero

58
Q
  1. (Why must a voltmeter have high resistance? a) To minimize current draw b) To maximize voltage measurement c) To reduce circuit power consumption d) To stabilize the battery)
A

Answer: a) To minimize current draw

59
Q
  1. (What is the primary use of a galvanometer in circuit analysis? a) Detect small currents b) Measure voltage drop c) Compare resistances d) Store electric charge)
A

Answer: a) Detect small currents

60
Q
  1. (During discharge, the charge on a capacitor decreases: A. Exponentially B. Linearly C. Logarithmically D. Quadratically)
A

Answer: A. Exponentially

61
Q
  1. (The cathode ray in a Cathode Ray Oscilloscope (CRO) produces light when it strikes: A. The fluorescent screen B. The control grid C. The anode D. The deflection plates)
A

Answer: A. The fluorescent screen

62
Q
  1. (The primary use of the Cathode Ray Oscilloscope is to: A. Visually follow and estimate transient variations of voltage B. Measure resistance C. Measure current D. Store electrical energy)
A

Answer: A. Visually follow and estimate transient variations of voltage

63
Q
  1. (The principle of the CRO is also utilized in: A. Television tubes B. Digital voltmeters C. Ammeter shunts D. Galvanometers)
A

Answer: A. Television tubes

64
Q
  1. (Kirchhoff’s first rule (junction rule) is based on the conservation of: A. Charge B. Energy C. Momentum D. Power)
A

Answer: A. Charge

65
Q
  1. (The equation represents Kirchhoff’s: A. Second rule B. First rule C. Series rule D. Parallel rule)
A

Answer: B. First rule

66
Q
  1. (To convert a galvanometer into an ammeter, a: A. Shunt is connected in parallel B. Multiplier is connected in series C. Shunt is connected in series D. Multiplier is connected in parallel)
A

Answer: A. Shunt is connected in parallel

67
Q
  1. (The time constant in an RC circuit represents the time taken for the charge to reach approximately: A. 63% of its maximum value B. 50% of its maximum value C. 90% of its maximum value D. 37% of its maximum value)
A

Answer: A. 63% of its maximum value

68
Q
  1. (The charge on a capacitor decreases to 37% of its original value in: A. One time constant B. Two time constants C. Three time constants D. Four time constants)
A

Answer: A. One time constant

69
Q
  1. (The main advantage of a potentiometer over a voltmeter is that: A. It draws no current from the source B. It is more compact C. It measures current directly D. It has lower sensitivity)
A

Answer: A. It draws no current from the source

70
Q
  1. (The resistance of resistors in series is: A. The sum of individual resistances B. The reciprocal of the sum of reciprocals C. Always less than the smallest resistance D. Always equal to the largest resistance)
A

Answer: A. The sum of individual resistances

71
Q
  1. (The equivalent resistance of resistors in parallel is: A. The reciprocal of the sum of reciprocals B. The sum of individual resistances C. Always greater than the largest resistance D. Equal to the largest resistance)
A

Answer: A. The reciprocal of the sum of reciprocals

72
Q
  1. (A device used to compare resistances using a null point is: A. A Wheatstone bridge B. A potentiometer C. An oscilloscope D. A galvanometer)
A

Answer: A. A Wheatstone bridge

73
Q
  1. (The equation for a discharging capacitor is given by: A. ) B. ) C. ) D. )
A

Answer: A. Q = Q₀ e^(-t/τ)

74
Q
  1. (The resistance of a voltmeter should be: A. Very high B. Very low C. Equal to the circuit resistance D. Infinite)
A

Answer: A. Very high

75
Q
  1. (A strain gauge is primarily used to measure: A. Pressure B. Voltage C. Current D. Resistance)
A

Answer: D. Resistance

76
Q
  1. (The SI unit of capacitance is: A. Farad B. Coulomb C. Volt D. Ampere)
A

Answer: A. Farad

77
Q
  1. (The function of the control grid in a cathode ray tube is to: A. Control the intensity of the electron beam B. Accelerate electrons C. Deflect the electron beam D. Generate the electron beam)
A

Answer: A. Control the intensity of the electron beam

78
Q
  1. (The time base of a CRO is responsible for: A. Moving the electron beam linearly with time B. Controlling the brightness of the trace C. Adjusting the focus of the trace D. Producing sinusoidal waveforms)
A

Answer: A. Moving the electron beam linearly with time

79
Q
  1. (The voltage across the plates of a capacitor in a CRO is applied to: A. The deflection plates B. The fluorescent screen C. The control grid D. The cathode)
A

Answer: A. The deflection plates

PHY 114 (8 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions