Metric Conversions for TEAS 7

Correct Answer: B

Rationale: The prefix 'centi' denotes the factor of 0.01. This is because 'centi' comes from the Latin word 'centum' which means one hundred. Therefore, 'centi' represents 1/100 or 0.01. The correct answer is B (0.01). Choice A (0.1) is incorrect as 'centi' is smaller than that. Choice C (0.001) is incorrect as it represents 'milli', not 'centi'. Choice D (1) is incorrect as 'centi' denotes a fraction of one, not a whole unit.

Correct Answer: B

Rationale: The correct answer is B: balance scale. A balance scale is used to measure the mass of an object by comparing it to a set of known masses. It works on the principle of equilibrium, where the object's mass is balanced by adding or removing known masses until the scale is level. Choice A, thermometer, measures temperature, not mass. Choice C, scale, is a general term and could refer to different types of scales, but a balance scale specifically measures mass. Choice D, caliper, is used to measure dimensions such as length or diameter, not mass. Therefore, the balance scale is the correct choice for measuring mass accurately.

Correct Answer: A

Rationale: To convert mg to mcg, we need to multiply by 1000 since 1 mg = 1000 mcg. So, 0.25 mg x 1000 = 250 mcg. Therefore, the correct answer is A: 250 mcg. Choice B, C, and D are incorrect because they do not correctly convert milligrams to micrograms.

Correct Answer: B

Rationale: To convert meters to kilometers, we divide by 1,000 since 1 kilometer is equal to 1,000 meters. Therefore, 1,000 meters divided by 1,000 equals 1 kilometer. Hence, the correct answer is B: 1 km. A: 0.1 km - Incorrect. This would be the equivalent of 100 meters. C: 10 km - Incorrect. This would be the equivalent of 10,000 meters. D: 0.01 km - Incorrect. This would be the equivalent of 10 meters.

Correct Answer: B

Rationale: The prefix 'centi' denotes the factor of 0.01. This is because 'centi' comes from the Latin word 'centum' which means one hundred. Therefore, 'centi' represents 1/100 or 0.01. The correct answer is B (0.01). Choice A (0.1) is incorrect as 'centi' is smaller than that. Choice C (0.001) is incorrect as it represents 'milli', not 'centi'. Choice D (1) is incorrect as 'centi' denotes a fraction of one, not a whole unit.