Nursing Metric Conversions

Correct Answer: A

Rationale: To convert liters to milliliters, you need to multiply by 1000 since there are 1000 milliliters in 1 liter. Therefore, to find how many milliliters are in 0.5 liters, you would multiply 0.5 by 1000 which equals 500 ml. This makes choice A, 500 ml, the correct answer. Choices B, C, and D are incorrect because they do not correctly convert liters to milliliters. Choice B (50 ml) is 10 times less than the correct answer, choice C (5 ml) is 100 times less, and choice D (0.5 ml) is 1000 times less than the correct answer.

Correct Answer: A

Rationale: The correct formula to convert Celsius to Fahrenheit is A: (C * 9/5) + 32. To convert Celsius to Fahrenheit, you first multiply the Celsius temperature by 9/5 to get the equivalent in Fahrenheit scale, then add 32 to adjust for the offset between the two scales. This formula correctly accounts for both the scaling factor and the offset. Choices B, C, and D have incorrect scaling factors or offsets, leading to inaccurate conversions. B uses the incorrect scaling factor, C and D incorrectly subtract 32 instead of adding it.

Correct Answer: B

Rationale: To convert milliliters to liters, divide by 1000 since 1 liter = 1000 milliliters. So, 2000 milliliters ÷ 1000 = 2 liters. Choice B is correct. Choice A is incorrect as it's 0.2 liters (misplaced decimal). Choice C is incorrect as it's 0.02 liters (decimal off by a factor of 10). Choice D is incorrect as it's 20 liters (decimal misplaced).

Correct Answer: A

Rationale: To simplify the ratio 0.004, we need to express it in the form of a ratio of integers. First, multiply by 1000 to get 4. So, the ratio becomes 4:1000. Further simplifying by dividing both terms by 4 gives us 1:250, which is the correct answer (A). Choices B, C, and D are incorrect because they do not represent the simplified ratio of 0.004. B, C, and D do not result from the correct calculation process and do not simplify to the equivalent ratio of 1:250.

Correct Answer: B

Rationale: The number 0.2 rounded to the nearest tenth means rounding to one decimal place. Since the digit after the tenths place is 0, we keep the tenths place as it is. Therefore, the correct answer is B: 0.2. A: 0.1 - Incorrect, this is rounding down to the nearest tenth. C: 0.3 - Incorrect, this is rounding up to the nearest tenth. D: 0.25 - Incorrect, this is rounding to the nearest hundredth, not tenth.