GRADE 4 WASTEWATER OPERATOR CERTIFICATION
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES
Set 1: Fundamentals of Nursing (Questions 1-50)
1. A nurse is preparing to administer an enteral feeding via a nasogastric (NG)
tube. Which of the following actions should the nurse take first?
A. Flush the tube with 30 mL of water.
B. Verify tube placement by aspirating gastric contents and checking pH.
C. Elevate the head of the bed to 30 degrees.
D. Check the residual volume.
Correct Answer: B
Rationale: Patient safety requires verifying NG tube placement before each
intermittent feeding or medication administration to prevent aspiration pneumonia.
Checking pH (should be ≤4) confirms gastric placement.
2. A patient with a terminal illness tells the nurse, "I'm ready to go. I don't want any
more treatments." The nurse notices the patient has a DNR order, but the family is
insisting on continued aggressive care. What is the nurse's priority action?
A. Follow the family's wishes to avoid conflict.
B. Tell the patient that the family knows best.
C. Call an ethics committee meeting.
D. Advocate for the patient's autonomy and clarify the DNR order with the
healthcare provider.
Correct Answer: D
,Rationale: The nurse's primary duty is to the patient. The patient has expressed a
clear wish and has a legal DNR order. The nurse must advocate for the patient and
clarify the plan with the provider.
3. A nurse is assessing a patient's pain using the PQRST mnemonic. What does the
"R" stand for?
A. Relief
B. Radiation
C. Region
D. Rate
Correct Answer: B
Rationale: PQRST stands for Provocation/Palliation, Quality/Quantity,
Region/Radiation, Severity Scale, and Timing. "R" specifically refers to whether the
pain radiates to other areas.
4. A patient is on fall precautions. Which nursing intervention is most appropriate
for this patient?
A. Keep the bed in the high position.
B. Keep all four side rails up.
C. Place the call light within reach.
D. Restrain the patient to prevent falls.
Correct Answer: C
Rationale: Placing the call light within reach empowers the patient to call for
assistance. Keeping bed in low position and using bilateral rails (not all four) are
standard; restraints are a last resort.
5. A nurse is calculating the intake for a patient. The patient consumed 8 oz of
water, 12 oz of soda, and 6 oz of soup. What is the total intake in mL?
A. 520 mL
,B. 780 mL
C. 260 mL
D. 1040 mL
Correct Answer: B
Rationale: Total oz = 8 + 12 + 6 = 26 oz. 1 oz = 30 mL. 26 x 30 = 780 mL.
6. A nurse is caring for a patient with a new colostomy. Which statement by the
patient indicates a need for further teaching?
A. "I should avoid carbonated beverages."
B. "I should eat foods high in fiber to thicken my stool."
C. "I should empty my pouch when it is one-third to one-half full."
D. "I should clean the skin around the stoma with mild soap and water."
Correct Answer: B
Rationale: High-fiber foods increase the bulk and frequency of stool, which is not
desirable for a new colostomy. Low-fiber foods help thicken stool initially.
7. During a sterile dressing change, the nurse drops a sterile gauze pad onto the
outer edge of the sterile field. What should the nurse do?
A. Pick it up and use it since it's within the 1-inch border.
B. Discard it and get a new one.
C. Push it further into the field with sterile forceps.
D. Use it and place it on the wound, but tell the patient.
Correct Answer: B
Rationale: The 1-inch border around a sterile field is considered contaminated.
Anything touching that border must be considered unsterile and discarded.
8. A nurse is preparing a patient for a subcutaneous injection of heparin. Which
needle gauge and length are most appropriate?
, A. 18 gauge, 1.5 inch
B. 25 gauge, 5/8 inch
C. 22 gauge, 1 inch
D. 27 gauge, 1.5 inch
Correct Answer: B
Rationale: Subcutaneous injections typically use a 25-27 gauge needle, 3/8 to 5/8
inch in length. 18 gauge is too large (usually for IM or blood draws).
9. A patient is receiving a blood transfusion. Which of the following is the most
common complication that the nurse should monitor for in the first 15 minutes?
A. Hemolytic reaction
B. Fluid overload
C. Febrile reaction
D. Anaphylactic reaction
Correct Answer: C
Rationale: Febrile reactions (chills, fever) are the most common transfusion reactions.
Hemolytic reactions are more severe but less common.
10. A nurse is providing wound care for a patient with a Stage III pressure ulcer.
Which wound care product is appropriate for a wound with granulation tissue?
A. Wet-to-dry dressing
B. Hydrogel
C. Alginate dressing
D. Normal saline irrigation
Correct Answer: B
Rationale: Hydrogel provides moisture to granulating wounds, promoting healing.
Wet-to-dry is for debridement, alginate is for heavy exudate, and saline irrigation
is for cleaning.
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES
Set 1: Fundamentals of Nursing (Questions 1-50)
1. A nurse is preparing to administer an enteral feeding via a nasogastric (NG)
tube. Which of the following actions should the nurse take first?
A. Flush the tube with 30 mL of water.
B. Verify tube placement by aspirating gastric contents and checking pH.
C. Elevate the head of the bed to 30 degrees.
D. Check the residual volume.
Correct Answer: B
Rationale: Patient safety requires verifying NG tube placement before each
intermittent feeding or medication administration to prevent aspiration pneumonia.
Checking pH (should be ≤4) confirms gastric placement.
2. A patient with a terminal illness tells the nurse, "I'm ready to go. I don't want any
more treatments." The nurse notices the patient has a DNR order, but the family is
insisting on continued aggressive care. What is the nurse's priority action?
A. Follow the family's wishes to avoid conflict.
B. Tell the patient that the family knows best.
C. Call an ethics committee meeting.
D. Advocate for the patient's autonomy and clarify the DNR order with the
healthcare provider.
Correct Answer: D
,Rationale: The nurse's primary duty is to the patient. The patient has expressed a
clear wish and has a legal DNR order. The nurse must advocate for the patient and
clarify the plan with the provider.
3. A nurse is assessing a patient's pain using the PQRST mnemonic. What does the
"R" stand for?
A. Relief
B. Radiation
C. Region
D. Rate
Correct Answer: B
Rationale: PQRST stands for Provocation/Palliation, Quality/Quantity,
Region/Radiation, Severity Scale, and Timing. "R" specifically refers to whether the
pain radiates to other areas.
4. A patient is on fall precautions. Which nursing intervention is most appropriate
for this patient?
A. Keep the bed in the high position.
B. Keep all four side rails up.
C. Place the call light within reach.
D. Restrain the patient to prevent falls.
Correct Answer: C
Rationale: Placing the call light within reach empowers the patient to call for
assistance. Keeping bed in low position and using bilateral rails (not all four) are
standard; restraints are a last resort.
5. A nurse is calculating the intake for a patient. The patient consumed 8 oz of
water, 12 oz of soda, and 6 oz of soup. What is the total intake in mL?
A. 520 mL
,B. 780 mL
C. 260 mL
D. 1040 mL
Correct Answer: B
Rationale: Total oz = 8 + 12 + 6 = 26 oz. 1 oz = 30 mL. 26 x 30 = 780 mL.
6. A nurse is caring for a patient with a new colostomy. Which statement by the
patient indicates a need for further teaching?
A. "I should avoid carbonated beverages."
B. "I should eat foods high in fiber to thicken my stool."
C. "I should empty my pouch when it is one-third to one-half full."
D. "I should clean the skin around the stoma with mild soap and water."
Correct Answer: B
Rationale: High-fiber foods increase the bulk and frequency of stool, which is not
desirable for a new colostomy. Low-fiber foods help thicken stool initially.
7. During a sterile dressing change, the nurse drops a sterile gauze pad onto the
outer edge of the sterile field. What should the nurse do?
A. Pick it up and use it since it's within the 1-inch border.
B. Discard it and get a new one.
C. Push it further into the field with sterile forceps.
D. Use it and place it on the wound, but tell the patient.
Correct Answer: B
Rationale: The 1-inch border around a sterile field is considered contaminated.
Anything touching that border must be considered unsterile and discarded.
8. A nurse is preparing a patient for a subcutaneous injection of heparin. Which
needle gauge and length are most appropriate?
, A. 18 gauge, 1.5 inch
B. 25 gauge, 5/8 inch
C. 22 gauge, 1 inch
D. 27 gauge, 1.5 inch
Correct Answer: B
Rationale: Subcutaneous injections typically use a 25-27 gauge needle, 3/8 to 5/8
inch in length. 18 gauge is too large (usually for IM or blood draws).
9. A patient is receiving a blood transfusion. Which of the following is the most
common complication that the nurse should monitor for in the first 15 minutes?
A. Hemolytic reaction
B. Fluid overload
C. Febrile reaction
D. Anaphylactic reaction
Correct Answer: C
Rationale: Febrile reactions (chills, fever) are the most common transfusion reactions.
Hemolytic reactions are more severe but less common.
10. A nurse is providing wound care for a patient with a Stage III pressure ulcer.
Which wound care product is appropriate for a wound with granulation tissue?
A. Wet-to-dry dressing
B. Hydrogel
C. Alginate dressing
D. Normal saline irrigation
Correct Answer: B
Rationale: Hydrogel provides moisture to granulating wounds, promoting healing.
Wet-to-dry is for debridement, alginate is for heavy exudate, and saline irrigation
is for cleaning.
