AP MECHANIC GENERAL
PRACTICE TEST
COMPLETE
Question 1: How is a voltmeter correctly connected in a circuit to measure voltage?
Choices:
1) In series with the power source 2) In parallel with the load or circuit being measured 3) In series with the load 4) Across the ground path only
Correct Answer: In parallel with the load or circuit being measured
Explanation: A voltmeter measures the potential di�erence across a component and must always be connected in parallel with the circuit or component being measured.Page 1
Question 2: What happens to the total resistance in a series circuit if another
resistor is added?
Choices:
1) It decreases 2) It remains the same 3) It increases 4) It drops to zero
Correct Answer: It increases
Explanation: In a series circuit, total resistance is the sum of all individual resistances (Rt = R1 + R2 + ...). Adding a resistor increases the total resistance.
Question 3: Which of the following is true regarding a capacitor?
Choices:
1) It allows direct current (DC) to �ow freely 2) It blocks alternating current (AC) 3) It stores electrical energy in an electrostatic �eld 4) It converts electrical energy into mechanical energy Correct Answer: It stores electrical energy in an electrostatic �eld Explanation: A capacitor stores electrical energy in the form of an electrostatic �eld and consists of two conductive plates separated by an insulator (dielectric).Page 2
Question 4: What is the total capacitance of three 10-microfarad capacitors
connected in parallel?
Choices:
1) 3.33 microfarads 2) 10 microfarads 3) 20 microfarads 4) 30 microfarads
Correct Answer: 30 microfarads
Explanation: When capacitors are connected in parallel, their total capacitance is the sum of the individual capacitances (Ct = C1 + C2 + C3). 10 + 10 + 10 = 30 microfarads.Question 5: According to Ohm's Law, what is the current in a 24-volt circuit with a 12- ohm resistor?
Choices:
1) 0.5 amps 2) 2 amps 3) 12 amps 4) 288 amps
Correct Answer: 2 amps
Explanation: Ohm's Law states I = V / R. Current (I) = 24 volts / 12 ohms = 2 amps.Page 3