Nursing Metric Conversion

Correct Answer: B

Rationale: The correct answer is B: Powers of 10. The metric system is based on the concept of powers of 10, where each unit is a multiple or fraction of 10. This allows for easy conversion between units by simply moving the decimal point. Multiplication (A), addition (C), and subtraction (D) are not the foundational principles of the metric system. Multiplication is involved in converting between different metric units, but the fundamental concept is the use of powers of 10. Addition and subtraction are not directly related to the structure of the metric system.

Correct Answer: C

Rationale: The correct answer is C: 1,000 mL. This is because there are 1,000 milliliters in 1 liter. This conversion is based on the metric system, where the prefix "milli-" represents one-thousandth of the base unit. In this case, the base unit is the liter. To convert from liters to milliliters, you multiply the number of liters by 1,000 since there are 1,000 milliliters in one liter. Therefore, 1 liter is equal to 1,000 milliliters. Choices A, B, and D are incorrect because they do not accurately represent the conversion factor between liters and milliliters.

Correct Answer: D

Rationale: To convert millimeters to centimeters, we divide by 10 since there are 10 millimeters in 1 centimeter. Therefore, 25 mm / 10 = 2.5 cm. The correct answer is D: 25 mm, as it represents the initial quantity to be converted. Choices A and B are incorrect as they do not follow the conversion factor. Choice C is incorrect as it represents the original unit rather than the converted unit.

Correct Answer: B

Rationale: The correct answer is B: Powers of 10. The metric system is based on the concept of powers of 10, where each unit is a multiple or fraction of 10. This allows for easy conversion between units by simply moving the decimal point. Multiplication (A), addition (C), and subtraction (D) are not the foundational principles of the metric system. Multiplication is involved in converting between different metric units, but the fundamental concept is the use of powers of 10. Addition and subtraction are not directly related to the structure of the metric system.

Correct Answer: A

Rationale: The correct answer is A: 2.54 cm. To convert inches to centimeters, we use the conversion factor 1 inch = 2.54 cm. This conversion factor is derived from the definition of an inch in the metric system. Therefore, there are 2.54 centimeters in 1 inch. Option B (3 cm) is incorrect because it does not align with the correct conversion factor of 1 inch = 2.54 cm. Option C (2 cm) is also incorrect as it does not match the accurate conversion. Option D (1 cm) is incorrect because it is not the correct conversion factor for inches to centimeters.