TEAS 7 science quizlet

TEAS 7 science quizlet Related

Review TEAS 7 science quizlet related questions and content

What is the process of splitting a heavy nucleus into smaller nuclei, releasing a vast amount of energy called?

  • A. Nuclear fusion
  • B. Nuclear fission
  • C. Radioactive decay
  • D. Chain reaction
Correct Answer: B

Rationale: The correct answer is B: Nuclear fission. Nuclear fission is the process of splitting a heavy nucleus into smaller nuclei, releasing a vast amount of energy. This process is commonly used in nuclear power plants and nuclear weapons. It is a controlled chain reaction that generates energy. Option A, Nuclear fusion, is the process of combining two light nuclei to form a heavier nucleus, releasing energy. This process powers the sun and other stars. Option C, Radioactive decay, is the process by which an unstable atomic nucleus loses energy by emitting radiation. Option D, Chain reaction, is a self-sustaining reaction where the products of one reaction event stimulate further reaction events. While chain reactions can occur in both nuclear fission and fusion, the specific process of splitting a heavy nucleus into smaller ones is known as nuclear fission.

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What is the term for the process of a liquid changing into a gas?

  • A. Evaporation
  • B. Boiling
  • C. Condensation
  • D. Sublimation
Correct Answer: A

Rationale: The correct answer is 'Evaporation.' Evaporation is the process by which a liquid changes into a gas at any temperature, while boiling specifically refers to the rapid vaporization of a liquid only at its boiling point. Condensation is the opposite process of gas turning into a liquid, and sublimation is the direct transition from solid to gas without passing through the liquid phase.

Which hormone is responsible for regulating blood sugar levels and is produced by the pancreas?

  • A. Insulin
  • B. Glucagon
  • C. Testosterone
  • D. Estrogen
Correct Answer: A

Rationale: Insulin is the correct answer. It is the hormone produced by the pancreas that regulates blood sugar levels by facilitating the uptake of glucose from the blood into cells for energy production or storage. Glucagon, also produced by the pancreas, has the opposite effect of increasing blood sugar levels by promoting the release of stored glucose from the liver. Testosterone and estrogen are sex hormones produced by the testes and ovaries, respectively, and are not directly involved in regulating blood sugar levels.

What is the process by which cells respond to external stimuli, such as chemicals, temperature, or touch, called?

  • A. Signal transduction
  • B. Homeostasis
  • C. Adaptation
  • D. Metabolism
Correct Answer: A

Rationale: Signal transduction is the correct answer. It is the process by which cells respond to external stimuli like chemicals, temperature, or touch. When a cell receives a signal from its environment, it triggers a series of molecular events leading to a specific cellular response. This process involves transmitting signals from the cell surface to the interior, triggering various cellular activities. Homeostasis, on the other hand, refers to an organism's ability to maintain internal stability in response to external changes. Adaptation involves an organism adjusting to its environment over time through genetic changes or behavioral modifications, which is distinct from the process of cells responding to immediate external stimuli. Metabolism, although essential for cellular functions, is not specifically about cells responding to external stimuli but rather the biochemical processes involved in energy production, storage, and utilization within cells.

What is the difference between heat and temperature?

  • A. They are the same thing.
  • B. Heat is a form of energy, while temperature measures the average kinetic energy of particles.
  • C. Heat flows from cold to hot, while temperature flows from hot to cold.
  • D. Heat is measured in Celsius, while temperature is measured in Joules.
Correct Answer: B

Rationale: Heat and temperature are distinct concepts. Heat is a form of energy that transfers from a higher temperature object to a lower temperature object, while temperature represents the average kinetic energy of particles in a substance. Heat is quantified in units like Joules or calories, whereas temperature is typically gauged in degrees Celsius or Fahrenheit. Therefore, choice B correctly distinguishes between heat and temperature, making it the correct answer. Choices A, C, and D are incorrect because they do not accurately define the difference between heat and temperature. Choice A erroneously suggests they are the same, choice C confuses the direction of heat and temperature flow, and choice D provides inaccurate units for measuring heat and temperature.

What happens to the momentum of an object when there is no external force acting upon it?

  • A. Momentum increases
  • B. Momentum decreases
  • C. Momentum remains constant
  • D. Momentum becomes zero
Correct Answer: C

Rationale: When there is no external force acting upon an object, the law of conservation of momentum dictates that the momentum of the object remains constant. This means that the momentum does not increase or decrease; it stays the same. Choice A is incorrect because momentum does not increase. Choice B is incorrect because momentum does not decrease. Choice D is incorrect as momentum does not become zero; it remains constant as per the conservation law. Therefore, the correct answer is C, as the object's momentum is unchanged in the absence of external forces.

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