1. What is the process of breaking down and rebuilding bone tissue called?

A. Ossification
B. Remodeling
C. Calcification
D. Osteoporosis

Correct answer: B

Rationale: The correct answer is B: Remodeling. Remodeling is the process of breaking down and rebuilding bone tissue. This process helps maintain bone strength and structure by replacing old or damaged bone with new bone. Ossification refers to the formation of bone tissue, not the breakdown and rebuilding process. Calcification is the deposition of calcium salts in tissues, not specifically related to bone tissue remodeling. Osteoporosis is a condition characterized by a decrease in bone density, but it is not the process of breaking down and rebuilding bone tissue.

2. What is the momentum of a car with a mass of 1500 kg moving at a speed of 20 m/s?

A. 30,000 kg m/s
B. 1500 kg m/s
C. 20 kg m/s
D. Momentum cannot be determined without knowing the direction of motion.

Correct answer: A

Rationale: Momentum is defined as the product of mass and velocity. Momentum = mass x velocity = 1500 kg x 20 m/s = 30,000 kg m/s.

3. Which phenomenon explains the formation of rainbows in the sky?

A. Diffraction
B. Interference
C. Refraction and dispersion of sunlight by water droplets.
D. Reflection from clouds

Correct answer: C

Rationale: Refraction and dispersion of sunlight by water droplets in the atmosphere separate white light into its constituent colors, creating the rainbow phenomenon.

4. What is the recommended daily fluid intake for adults?

A. 1 liter
B. 2 liters
C. 3 liters
D. 4 liters

Correct answer: B

Rationale: Rationale: The recommended daily fluid intake for adults is typically around 2 liters, which is equivalent to about 8 cups or half a gallon. This amount can vary depending on factors such as age, gender, weight, activity level, and climate. Staying adequately hydrated is essential for overall health and helps maintain proper bodily functions, such as regulating body temperature, aiding digestion, and transporting nutrients and oxygen throughout the body. Drinking enough fluids also helps prevent dehydration, which can lead to symptoms like fatigue, headaches, and dizziness. It's important to note that individual fluid needs may vary, so it's always best to consult with a healthcare provider for personalized recommendations.

5. Percent (%) is a way to express a fraction with a denominator of 100. 125% can be expressed as a fraction in lowest terms. Which of the following represents 125% as a fraction?

A. 5/4
B. 1/8
C. 5/2
D. 25/2

Correct answer: A

Rationale: Percent literally means "out of one hundred." So, 125% is equivalent to 125/100. We can simplify this fraction by dividing the numerator and denominator by 25, resulting in 5/2.

6. Which number is the opposite of -3?

A. -6
B. 3
C. 0
D. 6

Correct answer: B

Rationale: The opposite of a number is the one with the same distance from zero but on the opposite side of the number line. So, the opposite of -3 is 3.