1. Which digestive enzyme is primarily responsible for breaking down proteins?

A. Pepsin
B. Lipase
C. Amylase
D. Maltase

Correct answer: A

Rationale: The correct answer is A: Pepsin. Pepsin is primarily responsible for breaking down proteins in the stomach. It is an enzyme produced by the gastric chief cells in the stomach lining and works in a highly acidic environment to break down proteins into smaller peptide fragments. Lipase, on the other hand, is responsible for breaking down fats, amylase for breaking down carbohydrates, and maltase for breaking down maltose (a type of sugar). Therefore, pepsin is the correct enzyme involved in the digestion of proteins.

2. Two identical balls, one made of clay and the other made of steel, are dropped from the same height. Which ball reaches the ground first, neglecting air resistance?

A. The clay ball due to its lower density
B. The steel ball due to its higher density
C. Both balls reach the ground simultaneously
D. It depends on the initial velocities of the balls

Correct answer: C

Rationale: In a vacuum (neglecting air resistance), the acceleration due to gravity is constant for all objects regardless of their mass or composition. This means both balls will experience the same acceleration and reach the ground at the same time.

3. A car is traveling on a curved road. What force keeps the car moving along the curved path?

A. Gravitational force
B. Normal force from the road
C. Air resistance
D. Friction between the tires and the road

Correct answer: D

Rationale: In this case, static friction acts between the tires and the road, providing the centripetal force required to keep the car moving in a circle even though it's traveling in a straight line relative to the ground.

4. An object is thrown upwards and reaches a maximum height. Which of the following statements is TRUE about its velocity and acceleration at the peak?

A. Velocity is zero and acceleration is maximum upwards
B. Velocity is maximum and acceleration is zero.
C. Velocity is maximum and acceleration is maximum upwards.
D. Velocity is zero and acceleration is maximum downwards.

Correct answer: A

Rationale: At the peak, the object momentarily stops moving (zero velocity), but gravity still pulls it upwards, causing a maximum upward acceleration.

5. Which of the following is a unit of measurement for energy?

A. Watt (W)
B. Joule (J)
C. Newton (N)
D. Kilogram (kg)

Correct answer: b

Rationale: Energy is measured in Joules (J) in the SI unit system.

6. How are genetic markers used in paternity testing?

A. They identify unique sequences in the father's DNA present in the child.
B. They analyze the presence or absence of specific alleles for certain genes.
C. They compare the child's blood type to the parents' blood types.
D. They measure the child's physical resemblance to the father.

Correct answer: B

Rationale: Rationale: Genetic markers are specific DNA sequences that can vary among individuals. In paternity testing, genetic markers are used to compare the DNA of the child with that of the alleged father. By analyzing the presence or absence of specific alleles (different forms of a gene) at these genetic markers, scientists can determine the likelihood of paternity. This method is more accurate and reliable than comparing blood types or physical resemblance, making option B the most appropriate choice.