Nokea
Where was the metric system developed?
- A. Germany
- B. France
- C. Italy
- D. Spain
Correct Answer: B
Rationale: The metric system was developed in France during the 1790s as a standardized system of measurement. This choice is correct because the metric system originated in France. Germany, Italy, and Spain did not play a role in the development of the metric system, making choices A, C, and D incorrect.
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What is 0.4 grams in milligrams?
- A. 400 mg
- B. 40 mg
- C. 4 mg
- D. 4000 mg
Correct Answer: A
Rationale: To convert grams to milligrams, you need to multiply by 1000 as there are 1000 milligrams in one gram. Therefore, 0.4 grams x 1000 = 400 mg. Choice A, 400 mg, is the correct answer. Choices B, C, and D are incorrect because they do not correctly apply the conversion factor of 1000 to convert grams to milligrams.
What is 0.25 mg to mcg?
- A. 250 mcg
- B. 25 mcg
- C. 2.5 mcg
- D. 2500 mcg
Correct Answer: A
Rationale: To convert milligrams (mg) to micrograms (mcg), you multiply by 1000 because 1 mg is equal to 1000 mcg. Therefore, 0.25 mg is equal to 250 mcg. Choices B, C, and D are incorrect as they do not consider the correct conversion factor.
Convert 345 kilometers to meters (m).
- A. 345,000 m
- B. 34,500 m
- C. 34,500,000 m
- D. 345,000,000 m
Correct Answer: B
Rationale: To convert kilometers to meters, you need to multiply by 1,000 since there are 1,000 meters in a kilometer. Therefore, 345 km multiplied by 1,000 equals 345,000 meters. Choice A is incorrect as it incorrectly places the comma. Choice C is incorrect as it adds an extra zero at the end. Choice D is incorrect as it adds an extra zero at the beginning, resulting in an incorrect conversion.
How many grams are in 5 kilograms?
- A. 50 grams
- B. 500 grams
- C. 5000 grams
- D. 5 grams
Correct Answer: C
Rationale: To convert kilograms to grams, you need to multiply by 1000 because there are 1000 grams in a kilogram. Therefore, 5 kilograms x 1000 grams/kilogram = 5000 grams. Choices A, B, and D are incorrect because they do not correctly convert kilograms to grams.
Convert 34.5 grams to kilograms (kg).
- A. 3.45 kg
- B. 34.5 kg
- C. 345 kg
- D. 3.45 grams
Correct Answer: A
Rationale: To convert grams to kilograms, divide by 1,000 since there are 1,000 grams in a kilogram. Therefore, 34.5 grams · 1,000 = 0.0345 kilograms. The correct answer is 3.45 kg (not 3.45 grams, which is the amount given in the initial question). Choices B and C are incorrect as they do not involve the conversion from grams to kilograms. Choice D is also incorrect as it presents the value in grams instead of kilograms.