Metric Conversions for Nursing

Correct Answer: A

Rationale: The correct answer is A: 10^-15 meters. 1 femtometer is equal to 10^-15 meters. This is because the prefix "femto-" represents 10^-15. Therefore, one femtometer is equivalent to 10^-15 meters. Choice B: 10^-9 meters is incorrect as this corresponds to the prefix "nano-" not "femto-". Choice C: 10^-12 meters is incorrect as this corresponds to the prefix "pico-" not "femto-". Choice D: 10^-18 meters is incorrect as this corresponds to the prefix "atto-" not "femto-". In summary, the correct answer is A because 1 femtometer is equal to 10^-15 meters, as per the corresponding SI prefix.

Correct Answer: B

Rationale: The correct answer is B: 1,000 mg. There are 1,000 milligrams in 1 gram. This is because the prefix "milli-" represents one thousandth, so 1 gram is equal to 1,000 milligrams. Choice A (100 mg) is incorrect because it represents only a hundredth of a gram. Choice C (1 mg) is incorrect as it is only one thousandth of a gram. Choice D (10,000 mg) is incorrect as it is actually 10 grams, not 1 gram.

Correct Answer: B

Rationale: To divide 0.4 by 40, we can rewrite 0.4 as 4/10. Then, we divide 4 by 10 to get 0.1. So, 0.4 divided by 40 equals 0.1. Simplifying 0.1 as a fraction gives 1/10. To further simplify, we can divide both the numerator and denominator by 10 to get 1/1000, which is choice B. Choices A, C, and D are incorrect as they do not accurately represent the division of 0.4 by 40.

Correct Answer: A

Rationale: To express 0.004 as a ratio, we need to convert it to a fraction. 0.004 = 4/1000 = 1/250. Therefore, the correct ratio is 1:250. Choice B (4:20) simplifies to 1:5, not equivalent to 1:250. Choice C (2:40) simplifies to 1:20, also incorrect. Choice D (9:20) does not represent the decimal value 0.004. Hence, the correct answer is A.

Correct Answer: C

Rationale: To convert kilograms to grams, you need to multiply by 1000 since there are 1000 grams in 1 kilogram. So, 1.25 kg x 1000 = 1250 grams, which is choice C. Choice A (12.5 grams) is incorrect as it is 10 times less than the correct answer. Choice B (125 grams) is incorrect as it is missing a zero. Choice D (1250 mg) is incorrect as it is in milligrams, not grams.