Question: Which is incorrect in the practice of 5S in the workplace? Choose one from options A to D.

A. Seiri (整理) is separating necessary and unnecessary items, then discarding the unnecessary ones.

B. Seiton (整頓) is placing necessary items in designated places and making them available for use at any time.

C. Seiso (清掃) is an activity that not only removes dirt but also includes equipment inspection.

D. ✅ Seiketsu (清潔) is tidying the appearance of workers, and the work environment is not included.

Explanation: Answer D is incorrect because Seiketsu (cleanliness) not only covers the personal appearance of workers but also maintaining seiri, seiton, and seiso to keep the work environment in good condition. Seiketsu covers the work environment as a whole, not just individual appearance.

Question: Which is not included in the QC Seven Tools? Choose one from options A to D.

A. Pareto Diagram

B. Histogram

C. ✅ Flowchart

D. Scatter Diagram

Explanation: Answer C is correct because a Flowchart is included in the New QC Seven Tools, not the QC Seven Tools. The QC Seven Tools consist of: Pareto Diagram, Histogram, Scatter Diagram, Check Sheet, Cause-and-Effect Diagram, Control Chart, and Stratification.

Question: Which is the correct type of non-destructive inspection? Choose one from options A to D.

A. Tensile Test

B. ✅ Magnetic Particle Testing

C. Impact Test

D. Hardness Test

Explanation: Answer B is correct because magnetic particle testing is a non-destructive inspection method that can detect defects on or near the surface of the material without damaging the material. Options A, C, and D are destructive tests that damage the material sample during testing.

Question: Which is incorrect as a precaution when using a micrometer? Choose one from options A to D.

A. Perform zero-point adjustment before measurement.

B. Use the ratchet stop to maintain proper measuring force.

C. ✅ The object to be measured must be cooled before measurement.

D. The measuring surfaces must be kept clean.

Explanation: Answer C is incorrect because it is not necessary to cool the object to be measured. Basic measurements are performed at room temperature, and extreme temperature changes can affect measurement accuracy due to thermal expansion or contraction of the material.

Question: The following image shows a solid object drawn using the third angle projection method. Choose one from options A to F as the correct front view of this solid object.

(This question contains images)

A. ✅ A

B. B

C. C

D. D

Explanation: In third angle projection, the shape seen from the front is displayed as the front view. The top view is placed above the front view, and the side view is placed to the left or right of the front view. Based on the given top and side views, the corresponding level difference and external shape match image A. Therefore, the correct front view is A.

Question: Which is the most inappropriate content to be included in a work standard book? Choose one from options A to D.

A. Work procedures

B. Quality standards

C. ✅ Personal opinions of workers

D. Safety precautions

Explanation: Answer C is correct because a work standard book must contain objective and standardized content, and personal opinions should not be included. A work standard book contains work procedures, quality standards, and safety precautions that are objective and can be consistently applied by all workers.

Question: Which is the correct unit for cutting speed in lathe work? Choose one from options A to D.

A. rpm (revolutions per minute)

B. ✅ m/min (meters per minute)

C. mm/min (millimeters per minute)

D. m/s (meters per second)

Explanation: Answer B is correct because cutting speed indicates the speed at which the tip of the tool moves relative to the workpiece, and its unit is expressed in m/min (meters per minute). rpm is the unit for spindle rotation speed, not cutting speed.

Question: What is the purpose of quenching in the heat treatment of steel? Choose one from options A to D.

A. Decrease hardness

B. ✅ Increase hardness

C. Increase ductility

D. Improve machinability

Explanation: Answer B is correct because quenching is a heat treatment that heats steel and then cools it rapidly to transform the structure into martensite and increase hardness. This process makes the steel harder but also more brittle.

Soal: Which of the following is incorrect as the purpose of surface preparation in painting work? Choose one from options A to D.

A. Increasing the adhesion of the paint layer

B. Smoothing the surface

C. ✅ Reducing the amount of paint used

D. Increasing the anti-rust effect

Penjelasan: Answer C is correct because the purpose of surface preparation is to increase the adhesion of the paint layer, smooth the surface, and increase the anti-rust effect, but not to reduce the amount of paint used as the main goal. Good surface preparation might require more preparation materials but results in a higher quality final result.

Soal: Which is the first round conducted in the KYT (Hazard Prediction Training) 4-round method? Choose one from options A to D.

A. Establishment of countermeasures

B. ✅ Understanding the current situation

C. Search for the essence

D. Determination of countermeasures

Penjelasan: Answer B is correct because in the KYT 4-round method, the first round is to understand the current situation (what hazards are hidden). The complete sequence: 1) Understanding the situation, 2) Search for essence, 3) Establishment of measures, 4) Determination of targets.

Soal: What is represented by "C" in the PDCA cycle? Choose one from options A to D.

A. Planning (Plan)

B. Implementation (Do)

C. ✅ Evaluation (Check)

D. Improvement (Action)

Penjelasan: Answer C is correct because "C" in the PDCA cycle is Check (evaluation/inspection), which is the stage to check whether implementation is according to plan and whether targets are achieved. The PDCA cycle consists of: P (Plan), D (Do), C (Check), A (Action).

Soal: Which statement is correct regarding 100% inspection and sample inspection? Choose one from options A to D.

A. 100% inspection is only carried out on destructive inspection

B. Sample inspection is only carried out on non-destructive inspection

C. ✅ In destructive inspection, sample inspection is generally performed

D. In 100% inspection, defective products can definitely be prevented from flowing out

Penjelasan: Answer C is correct because destructive inspection damages the product, so if 100% inspection is carried out, all products will become unusable. Therefore, in destructive inspection, sample inspection is generally performed to ensure quality without destroying all products.

Question Translation

The following image shows the measurement results using a vernier caliper. What is the correct measurement value based on that scale reading? Choose one correct answer from options A～D.

Explanation:

The first step is to read the main scale (main scale / 本尺). The zero position on the vernier scale is slightly past 11 mm. Thus, the main scale reading is 11 mm.

The second step is to read the vernier scale (vernier scale / 副尺). The vernier line that is exactly aligned with the line on the main scale indicates a value of 0,65 mm.

Since the vernier caliper measurement result is obtained from the sum of the main scale and the vernier scale, then:

11 mm + 0,65 mm = 11,65 mm

So, the correct measurement value is 11,65 mm.

Soal: What is represented by the additional dimension symbol "φ"? Choose one from options A to D.

A. Radius

B. ✅ Diameter

C. Angle

D. Thickness

Penjelasan: Answer B is correct because the additional dimension symbol "φ" is a symbol determined by JIS standards to represent diameter. This symbol is used in technical drawings to show the size of the diameter of a circle or cylinder.

Soal: Which of the following is incorrect as a basic way of thinking in work improvement on standard work? Choose one from options A to D.

A. Eliminating wasteful movements

B. Optimizing work sequence

C. ✅ Not changing the old way at all

D. Improving quality

Penjelasan: Answer C is correct because in standard work improvement, it is important not to be stuck in old ways and always look for better methods. Continuous improvement (kaizen) requires openness to change and innovation to increase efficiency and quality.

Soal: Which of the following is incorrect as an advantage of digital calipers? Choose one from options A to D.

A. Easy to read

B. Measurement values can be recorded as data

C. ✅ No worry about battery running out

D. Few scale reading errors

Penjelasan: Answer C is correct because digital calipers operate with a battery, so there is a risk of being unable to use them due to the battery running out. This is one of the disadvantages of digital calipers compared to mechanical vernier calipers which do not require a battery.

Soal: Which of the following is correct regarding safety education based on the Industrial Safety and Health Act? Choose one from options A to D.

A. It is sufficient to conduct it only during new recruitment

B. It does not need to be conducted for managers

C. ✅ Education at the time of recruitment is a legal obligation

D. Special education is conducted voluntarily

Penjelasan: Answer C is correct because based on the Industrial Safety and Health Act, the implementation of safety and health education when recruiting workers (education at the time of recruitment) is mandatory for employers. This is a legal obligation that must be fulfilled by the company.

Question: What type of line represents hidden lines? Choose one from options A to D.

A. Continuous line

B. ✅ Dashed line

C. Chain line

D. Wavy line

Explanation: Answer B is correct because in JIS standards, hidden parts of an object (lines that are not visible) are displayed with dashed lines. Dashed lines are used to show edges or contours that cannot be seen from a specific viewpoint in technical drawings.

Question: What type of inspection in quality management is performed at each stage of the production process? Choose one from options A to D.

A. Receiving inspection

B. ✅ In-process inspection

C. Final inspection

D. Shipping inspection

Explanation: Answer B is correct because in-process inspection is an inspection conducted at each production process to check quality, find defective products early, and manage the process. This allows quality issues to be identified and corrected immediately before proceeding to the next stage.

Question: Which of the following is incorrect as a characteristic of visual inspection? Choose one from options A to D.

A. Depends on the inspector's skills

B. Can evaluate appearance quality

C. ✅ Can definitely detect internal defects

D. Short inspection time

Explanation: Answer C is correct because visual inspection is an inspection that checks the surface appearance and is not suitable for detecting internal defects. To detect internal defects, other inspection methods such as ultrasonic inspection, X-ray inspection, or other non-destructive methods are required.

Question: Which is the correct unit for feed rate in cutting machining? Choose one from options A to D.

A. m/min (meters per minute)

B. ✅ mm/min (millimeters per minute)

C. rpm (revolutions per minute)

D. m/s (meters per second)

Explanation: Answer B is correct because the feed rate indicates the distance traveled by the tool per unit of time and is expressed in mm/min (millimeters per minute). This is different from the cutting speed, which uses m/min.

Question: Which of the following is incorrect as a property of aluminum? Choose one from options A to D.

A. Lightweight

B. Good corrosion resistance

C. Good electrical conductivity

D. ✅ Has magnetism

Explanation: Answer D is correct because aluminum is a non-magnetic material and is not attracted by magnets. Aluminum does not have magnetic properties like iron or steel, so option D is an incorrect statement.

Question: Which of the following is the least important as content to be included in a work instruction sheet? Choose one from options A to D.

A. Work procedures

B. Quality standards

C. ✅ Worker's age

D. Safety precautions

Explanation: Answer C is correct because work instruction sheets must list objective information required for the job, and worker's age as personal information does not need to be listed. Work instruction sheets focus on procedures, standards, and safety relevant to the task, not the personal data of the worker.

Question: Which of the following is correct as the relationship of line thickness according to JIS standards? Choose one from options A to D.

A. Thick line : Thin line = 1 : 1

B. ✅ Thick line : Thin line = 2 : 1

C. Thick line : Thin line = 3 : 1

D. Thick line : Thin line = 4 : 1

Explanation: Answer B is correct because in JIS drawing standards, the thickness ratio between thick lines and thin lines is determined as 2:1. This is a consistent standard to ensure clarity and readability of technical drawings.

Question: Which of the following is incorrect as the content to be checked in pre-work inspection? Choose one from options A to D.

A. Abnormal machine noise

B. Safety device function

C. ✅ Product sales performance

D. Tool wear condition

Explanation: Answer C is correct because pre-work inspection is an inspection to perform work safely, and product sales performance is not an inspection item. Pre-work inspections focus on the condition of machines, tools, and safety, not business aspects like sales.

Question: Which of the following is the most inappropriate response when a product defect occurs? Choose one from options A to D.

A. Investigate the cause

B. Consider recurrence prevention measures

C. ✅ Punish the person in charge

D. Check if there are similar defects

Explanation: Answer C is correct because when a product defect occurs, what is important is investigating the cause and recurrence prevention, and it must focus on system improvement rather than individual punishment. A good approach is to improve processes and systems to prevent future problems, not blame people.

Question: What is the most important element in selecting cushioning material in industrial packaging? Choose one from options A to D.

A. ✅ Product weight and shape

B. Color of packaging material

C. Worker preference

D. Packaging aesthetics

Explanation: Answer A is correct because cushioning material functions to protect the product from impact, so selecting material that suits the product's weight and shape is most important. Cushioning materials must be chosen based on the product's physical characteristics to provide optimal protection.

Question: Which of the following cannot be expected as an effect of an improvement proposal system? Choose one from A to D.

A. Increased work efficiency

B. Quality improvement

C. Increased employee motivation

D. ✅ Reduction of manager's tasks

Explanation: Answer D is correct because the improvement proposal system aims for on-site improvement and increasing employee participation awareness, rather than directly reducing manager tasks. While the system can increase overall efficiency, the main focus is employee empowerment and continuous improvement.

Question: Which of the following statements is true regarding instrument calibration? Choose one from A to D.

A. Once calibrated once, it can be used forever

B. ✅ Periodic calibration is required

C. Calibration is only performed by the manufacturer

D. Storing calibration records is not required

Explanation: Answer B is correct because measuring instruments undergo changes in accuracy due to use, thus periodic calibration is necessary to maintain accuracy. Regular calibration ensures that measurements remain accurate and reliable over time.

Question: Which of the following is incorrect as a type of welding defect? Choose one from A to D.

A. Blow hole

B. Undercut

C. Oxide layer

D. ✅ Heat treatment hardening

Explanation: Answer D is correct because heat treatment hardening is not a welding defect, but a term expressing a change in metal properties. Welding defects include blow holes, undercuts, and oxide layers. Heat treatment hardening is an intentional process to change material properties, not a defect.