1. Which of the following is NOT a risk factor for developing atherosclerosis?

A. High blood pressure
B. High levels of LDL cholesterol
C. Regular physical activity
D. Smoking

Correct answer: C

Rationale: Regular physical activity is NOT a risk factor for developing atherosclerosis. In fact, engaging in regular physical activity can help reduce the risk of developing atherosclerosis by improving cardiovascular health, lowering blood pressure, and reducing LDL cholesterol levels. High blood pressure, high levels of LDL cholesterol, and smoking are all known risk factors for atherosclerosis. High blood pressure can damage blood vessels, making them more susceptible to plaque buildup. High levels of LDL cholesterol can lead to the accumulation of plaque in the arteries, narrowing the passageways and increasing the risk of atherosclerosis. Smoking is harmful to blood vessels, promoting inflammation and the formation of plaque. Therefore, regular physical activity is actually a protective factor against atherosclerosis rather than a risk factor.

2. Which sentence uses parallel structure correctly?

A. I enjoy reading, watching movies, and to spend time with friends.
B. Reading, watching movies, and spending time with friends are all activities I enjoy.
C. like to read, watch movies, and spend time with friends.
D. Reading, movies, and friends are all things I enjoy.

Correct answer: B

Rationale: Parallel structure means using the same grammatical form for elements in a list. Option (b) uses parallel gerunds ("reading," "watching," "spending"), making it the correct choice.

3. Which property of a substance describes its ability to conduct heat or electricity?

A. Reactivity
B. Conductivity
C. Density
D. Viscosity

Correct answer: b

Rationale: Conductivity refers to a substance's ability to conduct heat or electricity

4. Which organ helps break down food by grinding it with your teeth?

A. Stomach
B. Esophagus
C. Liver
D. Mouth

Correct answer: D

Rationale: Rationale: The mouth is the organ that helps break down food by grinding it with your teeth. The process of chewing, also known as mastication, breaks down food into smaller pieces, making it easier to swallow and digest. The teeth in the mouth play a crucial role in this initial stage of digestion by physically breaking down food into smaller particles. The other options listed do not directly participate in the mechanical breakdown of food through chewing.

5. Express 0.75 as a fraction.

A. 4/5
B. 3/4
C. 1/2
D. 1/4

Correct answer: B

Rationale: Decimals can be represented as fractions where the denominator is a power of 10 (in this case, 10 raised to the power of -1, or 1/10th). So, 0.75 is equivalent to 7/10. We can simplify this fraction by dividing the numerator and denominator by 5, resulting in 3/4.

6. What property of a wave determines its pitch in sound waves?

A. Amplitude
B. Frequency
C. Wavelength
D. Speed

Correct answer: B

Rationale: The pitch of a sound wave is determined by its frequency. Frequency refers to the number of cycles of a wave that occur in a given time period. Higher frequencies correspond to higher pitches, while lower frequencies correspond to lower pitches. Amplitude refers to the intensity or loudness of a sound wave, wavelength is the distance between two consecutive points in a wave, and speed is the rate at which a wave travels through a medium.