1. Which vitamin plays a vital role in muscle function and helps prevent muscle weakness and fatigue?

A. Vitamin A
B. Vitamin B12
C. Vitamin D
D. Vitamin E

Correct answer: B

Rationale: The correct answer is B: Vitamin B12. Vitamin B12 plays a crucial role in muscle function by aiding in the production of red blood cells, which carry oxygen to the muscles. This vitamin also helps maintain the health of nerves that control muscle movements. Deficiency in vitamin B12 can lead to muscle weakness and fatigue due to decreased oxygen delivery and impaired nerve function in the muscles. Vitamin A is important for vision and immune function, Vitamin D is crucial for bone health, and Vitamin E is an antioxidant that protects cells from damage, but they do not have the same direct impact on muscle function as Vitamin B12.

2. What happens to the wavelength of a wave when its frequency increases while the speed remains constant?

A. Wavelength increases
B. Wavelength decreases
C. Wavelength remains the same
D. Wavelength becomes zero

Correct answer: b

Rationale: When the frequency of a wave increases while the speed remains constant, the wavelength decreases.

3. What is a lifestyle practice that can benefit the lymphatic system?

A. Consuming a high-sugar diet
B. Maintaining a sedentary lifestyle
C. Regularly engaging in moderate exercise
D. Smoking cigarettes

Correct answer: C

Rationale: The correct answer is C: Regularly engaging in moderate exercise. Exercise can benefit the lymphatic system by promoting circulation and the movement of lymph fluid throughout the body. This helps to remove toxins and waste products, improving overall lymphatic function. Consuming a high-sugar diet (A) can have a negative impact on the lymphatic system by increasing inflammation and impairing immune function. Maintaining a sedentary lifestyle (B) can lead to poor lymphatic circulation and fluid retention. Smoking cigarettes (D) is harmful to the lymphatic system and overall health, as it can impair immune function and increase inflammation.

4. The phrase "illuminates not only past events" suggests that history

A. primarily serves as a nostalgic exercise in remembering old stories.
B. offers valuable lessons beyond simply recalling occurrences from the past.
C. is focused solely on factual accuracy and avoids drawing any interpretations.
D. exists only as a static record of unchanging events with no relevance to our lives.

Correct answer: B

Rationale: The phrase highlights that history goes beyond mere chronology, offering valuable insights and lessons beyond the dates and facts.

5. What are the building blocks of proteins?

A. Sugars
B. Fatty acids
C. Amino acids
D. Nucleotides

Correct answer: C

Rationale: Rationale: Proteins are macromolecules made up of long chains of amino acids. Amino acids are the building blocks of proteins and are linked together through peptide bonds to form polypeptide chains, which then fold into specific three-dimensional structures to carry out various functions in the body. Sugars (A) are the building blocks of carbohydrates, fatty acids (B) are the building blocks of lipids, and nucleotides (D) are the building blocks of nucleic acids like DNA and RNA.