Questions and Answers Actual Exam 2026/2027 | Detailed
Rationales | Graded A+ | Pass Guaranteed – A+ Graded
Section 1: General Science
Question 1
Which of the following is the primary function of the mitochondria in a cell?
A. Protein synthesis
B. Cellular respiration and ATP production
C. Photosynthesis
D. Waste removal
Correct Answer: B. Cellular respiration and ATP production
Rationale: Mitochondria are known as the "powerhouses" of the cell because they
generate ATP through cellular respiration. Protein synthesis occurs at ribosomes (A),
photosynthesis occurs in chloroplasts (C), and waste removal is handled by lysosomes
and vacuoles (D).
Question 2
What is the chemical formula for water?
A. CO₂
B. H₂O
C. NaCl
D. O₂
Correct Answer: B. H₂O
Rationale: Water consists of two hydrogen atoms and one oxygen atom. CO₂ is carbon
dioxide (A), NaCl is sodium chloride (C), and O₂ is molecular oxygen (D).
Question 3
Which planet in our solar system is known as the "Red Planet"?
A. Venus
B. Jupiter
,C. Mars
D. Saturn
Correct Answer: C. Mars
Rationale: Mars appears red due to iron oxide (rust) on its surface. Venus is often called
the morning/evening star (A), Jupiter is the largest planet (B), and Saturn is known for
its rings (D).
Question 4
In the human digestive system, where does most nutrient absorption occur?
A. Stomach
B. Large intestine
C. Small intestine
D. Esophagus
Correct Answer: C. Small intestine
Rationale: The small intestine has villi and microvilli that maximize surface area for
nutrient absorption. The stomach primarily breaks down food (A), the large intestine
absorbs water (B), and the esophagus transports food (D).
Question 5
What type of rock is formed when molten material cools and solidifies?
A. Sedimentary
B. Metamorphic
C. Igneous
D. Limestone
Correct Answer: C. Igneous
Rationale: Igneous rocks form from cooled magma or lava. Sedimentary rocks form
from compacted sediments (A), metamorphic rocks form from heat and pressure on
existing rocks (B), and limestone is a specific type of sedimentary rock (D).
Question 6
Which gas makes up approximately 78% of Earth's atmosphere?
A. Oxygen
, B. Carbon dioxide
C. Nitrogen
D. Argon
Correct Answer: C. Nitrogen
Rationale: Nitrogen (N₂) comprises about 78% of the atmosphere. Oxygen is about 21%
(A), carbon dioxide is about 0.04% (B), and argon is about 0.93% (D).
Question 7
What is the atomic number of an element defined as?
A. The number of neutrons in the nucleus
B. The number of protons in the nucleus
C. The total number of protons and neutrons
D. The number of electrons in the outer shell
Correct Answer: B. The number of protons in the nucleus
Rationale: The atomic number uniquely identifies an element by its proton count.
Neutron count defines isotopes (A), protons plus neutrons equals mass number (C), and
valence electrons determine chemical bonding (D).
Question 8
Which of the following is an example of a simple machine?
A. Electric motor
B. Lever
C. Battery
D. Computer
Correct Answer: B. Lever
Rationale: A lever is one of the six classical simple machines. An electric motor (A),
battery (C), and computer (D) are complex devices composed of multiple components
and energy sources.
Section 2: Arithmetic Reasoning
Question 9