Welcome to the Current Electricity MDCAT MCQs with Answers. In this post, we have shared Current Electricity Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Physics offers a chance to enhance your knowledge regarding Current Electricity MCQs in this MDCAT Online Test.
Current Electricity MDCAT MCQs Test Preparations
What is the unit of electric current?
A) Volt
B) Ohm
C) Ampere
D) Watt
Ohm’s Law states that the current through a conductor is directly proportional to:
A) Resistance
B) Voltage
C) Power
D) Capacitance
In a series circuit, the total resistance is:
A) The sum of individual resistances
B) The product of individual resistances
C) The reciprocal of the sum of reciprocals of individual resistances
D) Equal to the resistance of the smallest resistor
The unit of resistance is:
A) Volt
B) Ohm
C) Ampere
D) Watt
What is the relationship between power, voltage, and current?
A) Power = Voltage × Resistance
B) Power = Current × Resistance
C) Power = Voltage × Current
D) Power = Voltage / Current
Which of the following is a conductor of electricity?
A) Rubber
B) Glass
C) Copper
D) Plastic
The equivalent resistance of two resistors in parallel is:
A) The sum of their resistances
B) The product of their resistances divided by their sum
C) The reciprocal of the sum of the reciprocals of their resistances
D) The sum of their reciprocal resistances
In a parallel circuit, the voltage across each resistor is:
A) The same
B) Different
C) Equal to the sum of all resistances
D) Equal to zero
If the resistance in a circuit is doubled, the current:
A) Doubles
B) Halves
C) Stays the same
D) Quadruples
The total current entering a junction in a circuit is:
A) Equal to the total current leaving the junction
B) Less than the total current leaving the junction
C) Greater than the total current leaving the junction
D) Not related to the total current leaving the junction
What is the formula for calculating electrical power?
A) Power = Voltage × Current × Time
B) Power = Voltage / Current
C) Power = Current^2 × Resistance
D) Power = Voltage × Current
In which type of circuit does the current remain constant throughout?
A) Series Circuit
B) Parallel Circuit
C) Mixed Circuit
D) Open Circuit
If the voltage across a resistor is halved, the current through it:
A) Doubles
B) Halves
C) Stays the same
D) Becomes zero
Which component is used to limit current in a circuit?
A) Capacitor
B) Inductor
C) Resistor
D) Transformer
The formula for calculating the total resistance in a series circuit is:
A) R_total = R1 + R2 + R3 + …
B) 1/R_total = 1/R1 + 1/R2 + 1/R3 + …
C) R_total = (R1 × R2) / (R1 + R2)
D) R_total = (R1 + R2) / (R1 × R2)
In an electric circuit, what does a battery provide?
A) Resistance
B) Current
C) Voltage
D) Power
If two resistors of equal value are connected in parallel, their combined resistance is:
A) Equal to the value of one resistor
B) Twice the value of one resistor
C) Half the value of one resistor
D) Four times the value of one resistor
Which law states that the current through a conductor is directly proportional to the voltage across it?
A) Kirchhoff’s Voltage Law
B) Ohm’s Law
C) Faraday’s Law
D) Coulomb’s Law
The total current in a parallel circuit is the:
A) Sum of the currents through each resistor
B) Average of the currents through each resistor
C) Product of the currents through each resistor
D) Difference between the currents through each resistor
The device used to measure electric current is called a:
A) Voltmeter
B) Ammeter
C) Ohmmeter
D) Capacitor
The energy consumed in an electric circuit can be calculated using:
A) Energy = Current × Voltage
B) Energy = Voltage × Resistance
C) Energy = Current^2 × Voltage
D) Energy = Voltage^2 × Current
The principle of conservation of charge implies that:
A) Charge cannot be created or destroyed
B) Charge can be created but not destroyed
C) Charge can be destroyed but not created
D) Charge can be both created and destroyed
The resistance of a wire is inversely proportional to its:
A) Length
B) Cross-sectional area
C) Temperature
D) Voltage
In a circuit with a 12V battery and a 4Ω resistor, what is the current flowing through the resistor?
A) 3A
B) 6A
C) 12A
D) 48A
The equivalent resistance of resistors in series is:
A) Always less than the smallest resistor
B) Equal to the sum of the resistances
C) Always greater than the largest resistor
D) Equal to the average of the resistances
If the voltage across a resistor is doubled while the resistance remains constant, the current:
A) Doubles
B) Halves
C) Remains unchanged
D) Quadruples
What happens to the total resistance in a series circuit if more resistors are added?
A) It decreases
B) It remains the same
C) It increases
D) It becomes zero
In a parallel circuit, what is the effect of adding more branches?
A) The total resistance increases
B) The total resistance decreases
C) The total current decreases
D) The voltage across each branch decreases
Which component stores electrical energy in an electric field?
A) Resistor
B) Inductor
C) Capacitor
D) Transformer
The term used to describe the opposition to the flow of electric current is:
A) Voltage
B) Power
C) Resistance
D) Conductance
What is the formula to find the current through a resistor using Ohm’s Law?
A) Current = Voltage × Resistance
B) Current = Voltage / Resistance
C) Current = Resistance / Voltage
D) Current = Voltage + Resistance
If a circuit has a resistance of 10Ω and a voltage of 20V, what is the power consumed?
A) 200W
B) 10W
C) 20W
D) 2W
In an electric circuit, what is the role of a fuse?
A) To increase the current
B) To protect the circuit from excessive current
C) To store electrical energy
D) To convert electrical energy into mechanical energy
In a parallel circuit with identical resistors, the total current is:
A) Equal to the current through one resistor
B) The same as the voltage across one resistor
C) Divided equally among the resistors
D) The sum of the currents through each resistor
The power dissipated in a resistor can be calculated using which formula?
A) Power = Voltage × Current
B) Power = Current^2 × Resistance
C) Power = Voltage^2 / Resistance
D) All of the above
The resistance of a wire is directly proportional to its:
A) Cross-sectional area
B) Length
C) Voltage
D) Temperature
Which of the following laws is used to calculate the current in a circuit with multiple branches?
A) Ohm’s Law
B) Kirchhoff’s Current Law
C) Faraday’s Law
D) Coulomb’s Law
The concept of electrical resistance is primarily related to the:
A) Ability to store charge
B) Ease with which current flows through a material
C) Conversion of electrical energy into heat
D) Measure of the electrical energy supplied
If the voltage across a resistor is increased by 50%, what happens to the power dissipated by the resistor?
A) Increases by 50%
B) Decreases by 50%
C) Increases by 150%
D) Remains the same
What happens to the equivalent resistance in a parallel circuit if resistors of equal value are added?
A) It increases
B) It decreases
C) It stays the same
D) It becomes zero
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