TEAS 7 practice test science

TEAS 7 practice test science Related

Review TEAS 7 practice test science related questions and content

Which of the following is NOT a mechanism that can directly cause evolution by natural selection?

  • A. Mutations in genes
  • B. Differential survival and reproduction based on traits
  • C. Inheritance of acquired characteristics (like strong muscles from working out)
  • D. Competition for resources in an environment
Correct Answer: C

Rationale: A) Mutations in genes can introduce new genetic variations into a population, which can be acted upon by natural selection.
B) Differential survival and reproduction based on traits is a key component of natural selection, as individuals with advantageous traits are more likely to survive and pass on their genes to the next generation.
C) Inheritance of acquired characteristics, also known as Lamarckism, is not a mechanism of evolution by natural selection. Traits acquired during an individual's lifetime (such as strong muscles from working out) are not passed on to offspring.
D) Competition for resources in an environment can drive natural selection by favoring individuals with traits that help them better compete for limited resources.

Therefore, the correct answer is C) Inheritance of acquired characteristics (like strong muscles from working out), as it is not a mechanism that can directly cause evolution by natural selection.

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What determines the frequency of oscillations in a spring-mass system when the spring is stretched and released?

  • A. The mass of the object
  • B. The stiffness of the spring
  • C. The initial displacement of the object
  • D. All of the above
Correct Answer: B

Rationale: The frequency of oscillations in a spring-mass system is determined by the stiffness of the spring (spring constant) and the mass of the object. The stiffness of the spring affects how quickly the system oscillates back and forth, while the mass of the object influences the inertia and therefore the frequency. The initial displacement of the object does not impact the frequency of oscillations. Choice A is incorrect because while the mass of the object affects the frequency, it is not the sole determining factor. Choice C is incorrect as the initial displacement affects the amplitude of oscillations, not the frequency. Choice D is incorrect as not all factors listed determine the frequency, making it an incorrect choice.

What happens when an atom loses an electron?

  • A. It forms a molecule.
  • B. It gains a positive charge and becomes an ion.
  • C. It alters its elemental identity.
  • D. No change occurs; it remains neutral.
Correct Answer: B

Rationale: When an atom loses an electron, it gains a positive charge and becomes an ion. This occurs because the number of protons in the atom exceeds the number of electrons, leading to a positive charge. Therefore, the atom undergoes a transformation into an ion by losing an electron. Choice A is incorrect because losing an electron does not result in the formation of a molecule, as molecules are made up of bonded atoms. Choice C is incorrect because losing an electron does not change the fundamental identity of the atom; it only changes its charge. Choice D is incorrect because losing an electron causes the atom to become positively charged, altering its neutrality.

How does the amplitude of a wave relate to its intensity or loudness?

  • A. They are inversely proportional.
  • B. They are directly proportional.
  • C. They have no relationship.
  • D. Amplitude affects frequency, not intensity.
Correct Answer: B

Rationale: The amplitude of a wave is directly related to its intensity or loudness. In general, the larger the amplitude of a wave, the greater its intensity or loudness. This relationship is due to the fact that the amplitude of a wave represents the maximum displacement of particles in the medium from their rest position. The greater the displacement, the more energy the wave carries, leading to higher intensity or louder sound. Choice A is incorrect because the relationship between amplitude and intensity is direct, not inverse. Choice C is incorrect as there is a clear relationship between amplitude and intensity. Choice D is incorrect as amplitude primarily affects intensity or loudness, not frequency.

Where does most of the chemical digestion and absorption of nutrients occur?

  • A. Mouth
  • B. Stomach
  • C. Small intestine
  • D. Large intestine
Correct Answer: C

Rationale: The small intestine is the primary site for both chemical digestion and absorption of nutrients in the digestive system. The lining of the small intestine is equipped with villi and microvilli, which significantly increase the surface area available for absorption. Enzymes from the pancreas and bile from the liver play crucial roles in further breaking down food into absorbable molecules that can pass through the intestinal wall into the bloodstream. While the stomach assists in mechanical breakdown and initial protein digestion, it is not the main site of nutrient absorption. The large intestine, on the other hand, mainly absorbs water and electrolytes from undigested food particles. The mouth aids in initial mechanical breakdown and some carbohydrate digestion, but the majority of nutrient absorption occurs in the small intestine, making it the correct answer.

Which element is used in fire extinguishers to smother flames by displacing oxygen?

  • A. Nitrogen
  • B. Carbon dioxide
  • C. Helium
  • D. Argon
Correct Answer: B

Rationale: Carbon dioxide is the correct answer. It is used in fire extinguishers because it displaces oxygen, which is necessary for combustion. When carbon dioxide is released onto a fire, it reduces the oxygen concentration around the flames, effectively smothering the fire. This disruption of oxygen availability interrupts the chemical reaction that sustains the fire. Nitrogen (Choice A), helium (Choice C), and argon (Choice D) are not typically used in fire extinguishers for smothering flames by displacing oxygen. Nitrogen is an inert gas that can displace oxygen but is not as effective as carbon dioxide in fire suppression.

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