HESI A2
Biology HESI A2 Practice Test
1. Which of the following is an example of human error in an experiment?
- A. an imperfectly calibrated scale
- B. contaminating a sterile sample by breathing on it
- C. a draft in the laboratory slightly changing the temperature of a liquid
- D. failure to account for wind speed when measuring distance traveled
Correct answer: B
Rationale: Contaminating a sterile sample by breathing on it is an example of human error in an experiment because it involves an action directly caused by the researcher that compromises the integrity of the sample. Breathing on a sterile sample introduces external contaminants that can affect the results. Choices A, C, and D involve factors not directly under the researcher's control or are technical errors that do not involve direct human actions.
2. Select the meaning of the underlined word in the following sentence. All volatile liquids should be stored and labeled correctly.
- A. Unstable
- B. Abnormal
- C. Lethal
- D. Blended
Correct answer: A
Rationale: In the context of the sentence, 'volatile' means likely to change rapidly and unpredictably or evaporate quickly. When referring to liquids, volatile typically implies that the liquids are unstable and can easily change from liquid to gas. Therefore, the most appropriate meaning of 'volatile' in this sentence is 'unstable.' Choices B, C, and D are incorrect because 'abnormal' and 'lethal' do not capture the essence of rapid change or evaporation associated with volatile liquids, while 'blended' is unrelated to the characteristics of volatile liquids described in the sentence.
3. What is another word for latent?
- A. Flagrant
- B. Dormant
- C. Deceased
- D. Postponed
Correct answer: B
Rationale: The correct answer is B: Dormant. Latent and dormant are synonymous and refer to something existing but not currently active or evident. Choice A, 'Flagrant,' means something that is conspicuously offensive, blatant, or glaring, which is the opposite of latent. Choice C, 'Deceased,' means no longer alive, which is unrelated to latent. Choice D, 'Postponed,' means to delay or reschedule to a later time, which is not synonymous with latent.
4. How many ounces are in 3 pints?
- A. 24 ounces
- B. 48 ounces
- C. 32 ounces
- D. 64 ounces
Correct answer: B
Rationale: To find out how many ounces are in 3 pints, you need to multiply the number of pints by the number of ounces in 1 pint. Since there are 16 ounces in 1 pint, 3 pints equal 3 * 16 = 48 ounces. Therefore, the correct answer is 48 ounces. Choice A (24 ounces) is incorrect because it miscalculates the conversion. Choice C (32 ounces) is incorrect as it does not correctly apply the conversion factor. Choice D (64 ounces) is incorrect as it doubles the correct answer, showing a misunderstanding of the conversion.
5. Which word describes a person's music collection who listens to a mixture of genres from punk rock to classical?
- A. Theoretical
- B. Relevant
- C. Mélange
- D. Cacophony
Correct answer: C
Rationale: The word 'mélange' refers to a mixture or medley of different elements, which perfectly fits the description of someone who listens to various music genres. It implies diversity in their collection, covering a broad range of styles from punk rock to classical music. Choice A, 'Theoretical,' does not relate to music collections and is more aligned with concepts and hypotheses. Choice B, 'Relevant,' does not capture the idea of a varied music collection. Choice D, 'Cacophony,' refers to a harsh, discordant mixture of sounds, which does not represent a music collection with a variety of genres.
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