PAX Science NLN Exam 2025

PAX Science NLN Exam
2025
A material that settles out of a reaction is termed a(n)?
A.) precipitate
B.) product
C.) reactant
D.) solid CORRECT ANSWER: precipitate

Which of the following describes the acceleration due to gravity on Earth?
a) 9.8 m/s²
b) 6.67 m/s²
c) 3.00 x 10⁸ m/s²
d) 1.0 m/s²
CORRECT ANSWER: a) 9.8 m/s²

Which of the following is a covalent compound?
a) NaCl
b) H₂O
c) MgO
d) CaCl₂
CORRECT ANSWER: b) H₂O

Which organelle is responsible for producing energy in the form of ATP?
a) Nucleus
b) Ribosome
c) Mitochondria
d) Golgi apparatus
CORRECT ANSWER: c) Mitochondria

Which of the following is a greenhouse gas?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Argon
CORRECT ANSWER: c) Carbon dioxide

Which of the following is a renewable energy source?
a) Coal
b) Natural gas
c) Solar power

,d) Petroleum
CORRECT ANSWER: c) Solar power

What is the primary function of red blood cells?
a) Fight infection
b) Transport oxygen
c) Produce hormones
d) Digest food
CORRECT ANSWER: b) Transport oxygen

Which of the following is a characteristic of prokaryotic cells?
a) Presence of a nucleus
b) Lack of membrane-bound organelles
c) Complex multicellular structure
d) Large size
CORRECT ANSWER: b) Lack of membrane-bound organelles

What is the role of enzymes in biological reactions?
a) Provide energy
b) Speed up reactions
c) Store genetic information
d) Transport molecules
CORRECT ANSWER: b) Speed up reactions

Which process describes the movement of water across a selectively permeable
membrane?
a) Diffusion
b) Osmosis
c) Active transport
d) Endocytosis
CORRECT ANSWER: b) Osmosis

What is the atomic number of an element determined by?
a) Number of neutrons
b) Number of protons
c) Number of electrons
d) Number of isotopes
CORRECT ANSWER: b) Number of protons

What is the pH of a neutral solution?
a) 0
b) 7
c) 10
d) 14
CORRECT ANSWER: b) 7

,Which type of bond involves the sharing of electrons?
a) Ionic bond
b) Covalent bond
c) Hydrogen bond
d) Metallic bond
CORRECT ANSWER: b) Covalent bond

What is the chemical formula for glucose?
a) C₆H₁₂O₆
b) C₆H₁₀O₅
c) C₆H₆O₆
d) C₆H₈O₈
CORRECT ANSWER: a) C₆H₁₂O₆

What is the unit of force in the International System of Units (SI)?
a) Joule
b) Newton
c) Watt
d) Pascal
CORRECT ANSWER: b) Newton

What type of energy is stored in a stretched spring?
a) Kinetic energy
b) Thermal energy
c) Potential energy
d) Electrical energy
CORRECT ANSWER: c) Potential energy

Which law states that every action has an equal and opposite reaction?
a) Newton's First Law
b) Newton's Second Law
c) Newton's Third Law
d) Law of Gravitation
CORRECT ANSWER: c) Newton's Third Law

What is the speed of light in a vacuum?
a) 3.00 x 10⁸ m/s
b) 1.50 x 10⁸ m/s
c) 2.25 x 10⁸ m/s
d) 4.50 x 10⁸ m/s
CORRECT ANSWER: a) 3.00 x 10⁸ m/s

Which layer of the Earth is primarily composed of iron and nickel?
a) Crust
b) Mantle
c) Outer core

, d) Inner core
CORRECT ANSWER: c) Outer core

What is the primary cause of tides on Earth?
a) Wind
b) Earth's rotation
c) Gravitational pull of the Moon
d) Solar radiation
CORRECT ANSWER: c) Gravitational pull of the Moon

What is the process by which water vapor turns into liquid water?
a) Evaporation
b) Condensation
c) Sublimation
d) Precipitation
CORRECT ANSWER: b) Condensation

Which gas makes up the majority of Earth's atmosphere?
a) Oxygen
b) Carbon dioxide
c) Nitrogen
d) Argon
CORRECT ANSWER: c) Nitrogen

What is the primary function of the circulatory system?
a) Digestion
b) Transportation of nutrients and oxygen
c) Waste elimination
d) Sensory perception
CORRECT ANSWER: b) Transportation of nutrients and oxygen

Which of the following is a characteristic of a base?
a) Sour taste
b) pH less than 7
c) Releases H⁺ ions
d) Slippery feel
CORRECT ANSWER: d) Slippery feel

What is the smallest unit of life?
a) Atom
b) Molecule
c) Cell
d) Organ
CORRECT ANSWER: c) Cell

Which planet is known as the "Red Planet"?
a) Venus