OTEE - Officer Trainee Entrance General Science Principles Questions and Answers 1

Question 1

An individual is standing on a scale in an elevator that is accelerating upwards. How will the reading on the scale compare to their actual weight?

Accepted Answer

The reading will be higher than the actual weight.

Answer

According to Newton's Second Law (F=ma), when the elevator accelerates upward, the normal force exerted by the scale on the person must be greater than the force of gravity. The scale measures this normal force, so the reading will be higher than the person's actual weight (mass times gravitational acceleration).

Question 2

Which of the following chemical principles best explains why a mixture of oil and water separates into two distinct layers?

Accepted Answer

The principle of 'like dissolves like'

Answer

The principle of 'like dissolves like' states that polar substances tend to dissolve in other polar substances, while nonpolar substances dissolve in other nonpolar substances. Water is a polar molecule, and oil is nonpolar. Due to this difference in polarity, they are immiscible and will not dissolve in each other, causing them to separate.

Question 3

In the process of photosynthesis, plants convert light energy into which type of energy for storage?

Accepted Answer

Chemical Energy

Answer

Photosynthesis is the process where green plants use sunlight to synthesize foods from carbon dioxide and water. The light energy is captured and used to convert these inorganic substances into glucose, an organic molecule. The energy is stored in the chemical bonds of the glucose molecule, which is a form of chemical energy.

Question 4

A scientist observes that a metal object rusts when exposed to air and moisture. This change is an example of a:

Accepted Answer

Chemical change

Answer

Rusting, or the oxidation of iron, is a chemical change because a new substance (iron oxide) is formed. This new substance has different properties from the original iron. A physical change, like melting or boiling, does not result in the formation of a new substance.

Question 5

Which of the following is the primary function of mitochondria within a eukaryotic cell?

Accepted Answer

To generate most of the cell's supply of adenosine triphosphate (ATP)

Answer

Mitochondria are known as the 'powerhouses' of the cell. Their primary function is cellular respiration, a process that generates ATP, which is used as the main source of chemical energy to power the cell's biochemical reactions.

(OTEE) Officer Trainee Entrance Exam Practice Test

(OTEE) Officer Trainee Entrance Exam Practice Test

OTEE - Officer Trainee Entrance General Science Principles Questions and Answers 1