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Question 1
A solution contains 10% w/v; how many mg per mL does this concentration correspond to?
Correct Answer:
100 mg/mL
Explanation:
Understanding how percent weight/volume translates to concentration is the first step. A 10% w/v solution means 10 g of solute in every 100 mL of solution. To express this in mg per mL, convert grams to milligrams and divide by the volume in mL. So, 10 g equals 10,000 mg. 10,000 mg in 100 mL gives 10,000 mg / 100 mL = 100 mg per mL. Therefore, the concentration is 100 mg/mL. This corresponds to 10% w/v because 100 mg/mL multiplied by 100 mL equals 10,000 mg, i.e., 10 g. For reference, other values would map to different percentages (e.g., 50 mg/mL is 5 g per 100 mL, or 5% w/v).
Question 2
Where are intradermal injections delivered?
Correct Answer:
Into the dermis, just below the epidermis
Explanation:
Intradermal injections are placed into the dermis, the skin layer just beneath the outermost epidermis. This thin, highly vascular layer is rich in antigen-presenting cells, which is why it’s used for tests like skin tests and for delivering very small volumes of solution. Depositing into the fat under the skin would be a subcutaneous injection, going deeper into muscle would be intramuscular, and injecting into a vein would be intravenous. So the dermis, just below the epidermis, is the correct site for intradermal administration. A tiny amount with a fine needle often produces a small wheal, confirming proper placement.
Question 3
Which method administers medication to the stomach via a tube through the nose?
Correct Answer:
Rectal suppositories
Explanation:
Delivering medication to the stomach via a tube that goes in through the nose is nasogastric tube administration. An NG tube is threaded through the nostril, down the esophagus, and into the stomach, allowing liquids or medications to be given directly into the stomach when swallowing isn’t possible or practical. This route is distinct from oral tablets, which must be swallowed and dissolve in the GI tract; rectal suppositories, which are inserted into the rectum for absorption; and intramuscular injections, which deliver medication into muscle tissue for systemic absorption.
Question 4
What is the parenteral route defined as?
Correct Answer:
By injecting the drug
Explanation:
Parenteral administration means delivering a drug by injection, bypassing the gastrointestinal tract. This includes intravenous, intramuscular, and subcutaneous routes, and can also encompass other injected methods. Because the drug goes directly into the tissues or bloodstream, it often gives a rapid or more controlled onset and is used for medications that are poorly absorbed orally or degraded in the GI tract. The other options involve swallowing (oral/enteral), inhaling (inhalation), or applying to the skin (topical), which do not fit the parenteral definition.
Question 5
A dilution will produce 200 mL of a solution at 3 mg/mL using a stock solution of 10 mg/mL. How many milliliters of stock solution are needed?
Correct Answer:
60 mL
Explanation:
The key idea is that the total amount of drug stays the same when you dilute. Use C1V1 = C2V2 (equivalently, final concentration times final volume equals the amount of drug you need). First, find how much drug is required in the final solution: 3 mg/mL × 200 mL = 600 mg of drug. From the stock solution, you have 10 mg of drug per mL. To get 600 mg, you need 600 mg ÷ 10 mg/mL = 60 mL of stock solution. So, you would use 60 mL of the stock solution and dilute it up to 200 mL total. This gives a final concentration of 600 mg/200 mL = 3 mg/mL.
Question 1
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Prepare with the Pharmacy Science and Calculations Sessions 1-6 Practice Test practice quiz. This question bank includes 10 questions covering solution, many, contains, route, and stock. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Pharmacy Science and Calculations Sessions 1-6 Practice Test

This practice set contains 10 questions from the matching question bank and focuses on solution, many, contains, route, and stock. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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