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AT&T TKT II (803 TECHNICAL
KNOWLEDGE TEST II) EXAM PREP
GUIDE
300+ PRACTICE QUESTIONS WITH
VERIFIED ANSWERS & DETAILED
RATIONALES
UPDATED FOR THE 2026-2027
ACADEMIC YEAR | 100% VERIFIED
SOLUTIONS | GRADED A+
# SECTION 1: BASIC ELECTRICITY (~25% of Exam)
## 1.1 Electrical Fundamentals & Units
**Q1. What is the unit of measurement for electrical current?**
- A) Volt
- B) Ohm
- C) Ampere
- D) Watt
**Correct Answer: C — Ampere**
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**Rationale:** The ampere (amp) is the SI unit for measuring electrical current, which
represents the rate of electron flow through a conductor. Voltage is measured in volts, resistance
in ohms, and power in watts.
---
**Q2. Which subatomic particle carries a negative electric charge?**
- A) Proton
- B) Neutron
- C) Electron
- D) Positron
**Correct Answer: C — Electron**
**Rationale:** Electrons have a negative charge (-1 elementary charge). Protons carry a positive
charge (+1), neutrons are neutral (0), and positrons are antimatter particles with positive charge.
---
**Q3. Volt is a measure of:**
- A) Electrical current
- B) Electrical resistance
- C) Electromotive force or electrical potential
- D) Electrical power
**Correct Answer: C — Electromotive force or electrical potential**
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**Rationale:** The volt is the SI unit of electromotive force (EMF) and electrical potential
difference. It represents the potential energy per unit charge between two points in an electric
field.
---
**Q4. What is the base unit of electrical charge?**
- A) Ampere
- B) Volt
- C) Coulomb
- D) Ohm
**Correct Answer: C — Coulomb**
**Rationale:** The coulomb is the SI unit of electric charge. One coulomb is defined as the
amount of charge transported by a current of one ampere flowing for one second.
---
**Q5. Electrons and protons:**
- A) Repel each other
- B) Attract each other
- C) Have no effect on each other
- D) Only interact in magnetic fields
**Correct Answer: B — Attract each other**
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**Rationale:** Opposite charges attract. Electrons carry a negative charge while protons carry a
positive charge, so they are attracted to each other. Like charges (electron-electron or proton-
proton) repel.
---
**Q6. An electron is a particle with a ______ charge.**
- A) Positive
- B) Negative
- C) Neutral
- D) Variable
**Correct Answer: B — Negative**
**Rationale:** By definition, an electron is a subatomic particle with a negative electric charge.
This is a fundamental property of electrons that determines their behavior in electrical circuits.
---
**Q7. What is the equation for electrical power (P)?**
- A) P = V / I
- B) P = V × I
- C) P = I / V
- D) P = V² × R
**Correct Answer: B — P = V × I**
AT&T TKT II (803 TECHNICAL
KNOWLEDGE TEST II) EXAM PREP
GUIDE
300+ PRACTICE QUESTIONS WITH
VERIFIED ANSWERS & DETAILED
RATIONALES
UPDATED FOR THE 2026-2027
ACADEMIC YEAR | 100% VERIFIED
SOLUTIONS | GRADED A+
# SECTION 1: BASIC ELECTRICITY (~25% of Exam)
## 1.1 Electrical Fundamentals & Units
**Q1. What is the unit of measurement for electrical current?**
- A) Volt
- B) Ohm
- C) Ampere
- D) Watt
**Correct Answer: C — Ampere**
,Page 2 of 154
**Rationale:** The ampere (amp) is the SI unit for measuring electrical current, which
represents the rate of electron flow through a conductor. Voltage is measured in volts, resistance
in ohms, and power in watts.
---
**Q2. Which subatomic particle carries a negative electric charge?**
- A) Proton
- B) Neutron
- C) Electron
- D) Positron
**Correct Answer: C — Electron**
**Rationale:** Electrons have a negative charge (-1 elementary charge). Protons carry a positive
charge (+1), neutrons are neutral (0), and positrons are antimatter particles with positive charge.
---
**Q3. Volt is a measure of:**
- A) Electrical current
- B) Electrical resistance
- C) Electromotive force or electrical potential
- D) Electrical power
**Correct Answer: C — Electromotive force or electrical potential**
,Page 3 of 154
**Rationale:** The volt is the SI unit of electromotive force (EMF) and electrical potential
difference. It represents the potential energy per unit charge between two points in an electric
field.
---
**Q4. What is the base unit of electrical charge?**
- A) Ampere
- B) Volt
- C) Coulomb
- D) Ohm
**Correct Answer: C — Coulomb**
**Rationale:** The coulomb is the SI unit of electric charge. One coulomb is defined as the
amount of charge transported by a current of one ampere flowing for one second.
---
**Q5. Electrons and protons:**
- A) Repel each other
- B) Attract each other
- C) Have no effect on each other
- D) Only interact in magnetic fields
**Correct Answer: B — Attract each other**
, Page 4 of 154
**Rationale:** Opposite charges attract. Electrons carry a negative charge while protons carry a
positive charge, so they are attracted to each other. Like charges (electron-electron or proton-
proton) repel.
---
**Q6. An electron is a particle with a ______ charge.**
- A) Positive
- B) Negative
- C) Neutral
- D) Variable
**Correct Answer: B — Negative**
**Rationale:** By definition, an electron is a subatomic particle with a negative electric charge.
This is a fundamental property of electrons that determines their behavior in electrical circuits.
---
**Q7. What is the equation for electrical power (P)?**
- A) P = V / I
- B) P = V × I
- C) P = I / V
- D) P = V² × R
**Correct Answer: B — P = V × I**
