CSLB C-10 Electrical Practice Test

Full Mock Exams

How This Practice Test Works

• Each attempt draws 15–20 questions at random from our pool of 162 and shuffles the answer order. Score 80% or more and the next test moves up a difficulty level; under 50% and it eases back.
• After every answer you see an explanation and the CSLB reference behind it.
• We use 70% as a practice target. CSLB tells you the passing percentage at the test site. Aim for 80% or better here.
• There is no sign-up. Your level is saved only in this browser.

These are original questions written by our editorial team from the published CSLB. They are not real exam questions. Questions quote CSLB, Cal/OSHA and eCFR text, not real CSLB exam items. Code-calculation questions from the copyrighted California Electrical Code are not reproduced.

What the Question Pool Covers

Every question cites the rule behind its answer. Counting those references shows where the pool puts its weight:

Sample Questions With Worked Answers

A few questions from the pool with the answer and explanation, so you can see the style before you start.

1. How many major sections does the CSLB C-10 Electrical trade exam cover?

   Answer: Five. Source text: “The Electrical (C-10) Examination is divided into five major sections…”

   Reference: CSLB C-10 Electrical Study Guide (13E-10, 03/2026)

2. Which C-10 exam section carries the largest weight?

   Answer: Planning and Estimating (28%). Source text: “Planning and Estimating (28%)…”

   Reference: CSLB C-10 Electrical Study Guide (13E-10, 03/2026)

3. About what share of the C-10 exam is Rough Wiring?

   Answer: 27%. Source text: “Rough Wiring (27%)…”

   Reference: CSLB C-10 Electrical Study Guide (13E-10, 03/2026)

4. About what share of the C-10 exam is Finish Wiring and Trim?

   Answer: 11%. Source text: “Finish Wiring and Trim (11%)…”

   Reference: CSLB C-10 Electrical Study Guide (13E-10, 03/2026)

5. About what share of the C-10 exam covers Startup, Troubleshooting, and Maintenance?

   Answer: 16%. Source text: “Startup, Troubleshooting, and Maintenance (16%)…”

   Reference: CSLB C-10 Electrical Study Guide (13E-10, 03/2026)

How Difficulty Is Spread Across the Pool

Each question is tagged Foundation, Intermediate or Advanced, and each new test favors questions close to your current level that you have not seen yet in this browser. This is how the 162 CSLB C-10 Electrical questions divide:

Because unseen questions come first, repeated attempts work through the pool rather than repeating the same items. Note the reference on every miss and reread that section before your next attempt.

Study Before You Test

• CSLB C-10 Electrical Exam Guide
• CSLB C-10 Full Mock Exam
• CSLB Law and Business Exam Guide

Sources

• CSLB C-10 Electrical Study Guide
• CSLB List of All Fees
• Cal/OSHA Title 8 §2320.2 Energized Equipment
• 29 CFR 1926.404 Wiring Design and Protection