MCAT practice questions

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Re: MCAT practice questions

Postby goldstandard_mcat » Sun Feb 04, 2018 11:55 pm

A cookie recipe calls for 2/3 as much sugar as flour, evenly mixed. If 2 cups of flour is used and the recipe makes 16 cookies, how much sugar is there in 6 cookies?
A. 1 cup
B. 1/6 cup
C. 1/4 cup
D. 1/2 cup

Correct answer: D
This is a conversion problem in disguise. First determine the amount of sugar in a single cookie:
(2/3 cups sugar/1 cup flour)(2 cups flour/1 batch)(1 batch/16 cookies)
= 1/12 cups sugar per cookie
Now multiply this by 6 cookies:
= 1/2 cups sugar per 6 cookies.

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Re: MCAT practice questions

Postby goldstandard_mcat » Wed Mar 07, 2018 6:00 am

What is the SI unit for distance?
A. kilometers
B. meters
C. centimeters
D. Feet

Correct answer: B
The International System of Units (SI) defines seven units of measure as the basic set from which all other SI units are derived. These SI base units and their physical quantities are: (1) the meter for length; (2) the kilogram for mass (not the gram); (3) the second for time; (4) the ampere for electric current; (5) the kelvin for temperature (not Celsius); (6) the candela for luminous intensity (brightness); and (7) the mole for the amount of substance.

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Re: MCAT practice questions

Postby goldstandard_mcat » Mon Apr 02, 2018 4:56 am

Two identical evacuated flasks are filled with different gases to the same pressure and temperature. The first is filled with hydrogen and the second with propane. Compared with the first flask, the flask filled with propane weighs:

A. 11 times more.
B. 22 times more.
C. the same.
D. 44 times more.

Correct answer: B

Rearranging the ideal gas equation, we get:
n = PV/RT.
Since P, V, and T are the same for both gas samples, n is also the same. However, propane has a molecular weight of 44, while H2 has a molecular weight of 2. Therefore, a molecule of propane weighs 22 times more than a molecule of hydrogen. Consequently, the sample of propane weighs 22 times more than the sample of hydrogen.

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