1. Which type of brain wave activity is often seen during REM sleep, associated with dreaming?

A. Delta waves
B. Alpha waves
C. Beta waves
D. Theta waves

Correct answer: D

Rationale: During REM (rapid eye movement) sleep, the brain is highly active, and theta waves are the dominant brain wave pattern. Theta waves are associated with deep relaxation, creativity, and dreaming. Delta waves are typically seen in deep sleep stages, not during REM sleep. Alpha waves are present when we are awake but relaxed, while beta waves are associated with active thinking and concentration. Therefore, theta waves are the correct answer for brain wave activity during REM sleep.

2. What is the SI unit of measurement for acceleration?

A. Meters per second (m/s)
B. Newton (N)
C. Meters (m)
D. Meters per second squared (m/sÂ²)

Correct answer: d

Rationale: Acceleration is measured in meters per second squared (m/sÂ²) in the SI unit system.

3. Identify the antonym of the word "pensive":

A. joyous
B. thoughtful
C. curious
D. introspective

Correct answer: A

Rationale: "Joyous" is the opposite of "pensive," which means thoughtful and slightly melancholy.

4. Which word correctly completes the sentence: "He was _____ by the kindness of strangers."

A. affected
B. infected
C. effected
D. defected

Correct answer: C

Rationale: "Effected" means to produce a result or impression, aligning with the emotional impact of the strangers' kindness.

5. What is the general formula for an alkene?

A. CnH2n+2
B. CnH2n
C. CnH2n-2
D. CnH2n+1

Correct answer: B

Rationale: The general formula for an alkene is $C_nH_{2n}$, indicating the presence of a double bond between carbon atoms.

6. What is the main function of the urinary system?

A. Transporting oxygen
B. Fighting off infections
C. Maintaining acid-base balance
D. All of the above

Correct answer: D

Rationale: The correct answer is D: 'All of the above.' The main function of the urinary system is not just limited to one specific task but encompasses multiple important functions. It is responsible for maintaining acid-base balance by regulating the pH of the blood through the excretion of acids and bases. Additionally, the urinary system plays a crucial role in filtering waste products from the blood and expelling them from the body, which helps in fighting off infections. Moreover, the urinary system is not involved in transporting oxygen, as this function is primarily carried out by the respiratory system. Therefore, 'All of the above' is the correct choice as it includes the comprehensive functions of the urinary system.