TEAS - General Science Practice Questions
- Which organelle is responsible for producing energy in eukaryotic cells?
- A) Nucleus
- B) Ribosome
- C) Mitochondrion
- D) Golgi apparatus
Description: The mitochondrion is known as the powerhouse of the cell because it generates ATP, the cell's primary energy currency, through cellular respiration.
- What is the primary source of energy for Earth's climate system?
- A) Geothermal heat
- B) Solar radiation
- C) Tidal forces
- D) Volcanic activity
Description: Solar radiation from the sun drives Earth's climate by providing the energy that fuels weather patterns, ocean currents, and the water cycle.
- Which type of bond involves the sharing of electrons between atoms?
- A) Ionic bond
- B) Covalent bond
- C) Hydrogen bond
- D) Metallic bond
Description: A covalent bond forms when two atoms share electrons to achieve a stable electron configuration, as seen in molecules like water (H₂O).
- What is the pH of a neutral solution at 25°C?
- A) 0
- B) 7
- C) 14
- D) 10
Description: A neutral solution has a pH of 7 at 25°C, indicating a balance between hydrogen ions (H⁺) and hydroxide ions (OH⁻) in water.
- Which gas makes up the largest percentage of Earth's atmosphere?
- A) Oxygen
- B) Carbon dioxide
- C) Nitrogen
- D) Argon
Description: Nitrogen constitutes approximately 78% of Earth's atmosphere, making it the most abundant gas.
- What type of tissue connects muscles to bones?
- A) Cartilage
- B) Tendon
- C) Ligament
- D) Adipose tissue
Description: Tendons are tough, fibrous connective tissues that attach muscles to bones, enabling movement.
- Which phase of matter has a definite volume but no definite shape?
- A) Solid
- B) Liquid
- C) Gas
- D) Plasma
Description: A liquid takes the shape of its container but maintains a constant volume due to the close proximity of its particles.
- What is the primary function of red blood cells?
- A) Fight infection
- B) Transport oxygen
- C) Clot blood
- D) Produce hormones
Description: Red blood cells contain hemoglobin, which binds and transports oxygen from the lungs to tissues throughout the body.
- Which element is essential for the formation of thyroid hormones?
- A) Iron
- B) Iodine
- C) Calcium
- D) Magnesium
Description: Iodine is a key component of thyroid hormones (T3 and T4), which regulate metabolism.
- What type of reaction releases energy to its surroundings?
- A) Endothermic
- B) Exothermic
- C) Neutralization
- D) Redox
Description: An exothermic reaction releases energy, typically as heat, to the surroundings, such as in combustion reactions.
- Which structure in the human body protects the lungs and heart?
- A) Skull
- B) Rib cage
- C) Pelvis
- D) Spine
Description: The rib cage surrounds and protects the lungs and heart while also supporting the structure of the upper body.
- What is the unit of force in the metric system?
- A) Joule
- B) Watt
- C) Newton
- D) Pascal
Description: A newton is the metric unit of force, defined as the force required to accelerate a 1 kg mass by 1 m/s².
- Which type of rock is formed by the cooling of molten magma?
- A) Sedimentary
- B) Igneous
- C) Metamorphic
- D) Fossiliferous
Description: Igneous rocks, such as granite, form when molten magma cools and solidifies.
- What is the primary source of genetic variation in sexually reproducing organisms?
- A) Mitosis
- B) Meiosis
- C) Binary fission
- D) Transcription
Description: Meiosis introduces genetic variation through processes like crossing over and independent assortment during gamete formation.
- Which subatomic particle carries a negative charge?
- A) Proton
- B) Neutron
- C) Electron
- D) Nucleus
Description: An electron is a negatively charged particle that orbits the nucleus of an atom.
- What is the primary function of the large intestine?
- A) Digest proteins
- B) Absorb water
- C) Produce bile
- D) Store nutrients
Description: The large intestine primarily absorbs water from undigested food, forming solid waste (feces).
- Which type of energy is stored in an object due to its position?
- A) Kinetic energy
- B) Potential energy
- C) Thermal energy
- D) Chemical energy
Description: Potential energy is stored energy based on an object's position, such as a book on a shelf having gravitational potential energy.
- What is the chemical formula for water?
- A) CO₂
- B) H₂O
- C) NaCl
- D) O₂
Description: The chemical formula for water is H₂O, indicating two hydrogen atoms bonded to one oxygen atom.
- Which planet is closest to the Sun?
- A) Venus
- B) Mercury
- C) Earth
- D) Mars
Description: Mercury is the closest planet to the Sun, orbiting at an average distance of about 58 million kilometers.
- What process do plants use to convert sunlight into chemical energy?
- A) Respiration
- B) Photosynthesis
- C) Fermentation
- D) Transpiration
Description: Photosynthesis is the process by which plants use sunlight, carbon dioxide, and water to produce glucose and oxygen.
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