Mometrix TEAS 7 science practice test

Mometrix TEAS 7 science practice test Related

Review Mometrix TEAS 7 science practice test related questions and content

What is the relationship between the wavelength (λ) and frequency (f) of a wave with a constant speed (v)?

  • A. λ = v / f
  • B. λ = f / v
  • C. λ = vf
  • D. λ is independent of f and v
Correct Answer: A

Rationale: The relationship between wavelength (λ), frequency (f), and speed (v) of a wave is given by the formula λ = v / f. This formula is derived from the wave equation v = fλ, where v is the speed of the wave, f is the frequency, and λ is the wavelength. By rearranging the equation, we get λ = v / f, indicating that the wavelength is inversely proportional to the frequency when the speed of the wave is constant. Therefore, choice A, λ = v / f, correctly represents the relationship between wavelength and frequency when the speed of the wave is held constant. Choice B, λ = f / v, is incorrect because it represents an inverse relationship between wavelength and speed, which is not the case. Choice C, λ = vf, is incorrect as it implies a direct relationship between wavelength, frequency, and speed, which is not accurate. Choice D, λ is independent of f and v, is incorrect as both frequency and speed affect the wavelength of a wave, as shown by the correct formula λ = v / f.

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What functional group is present in esters?

  • A. Hydroxyl
  • B. Carbonyl
  • C. Ester
  • D. Amine
Correct Answer: C

Rationale: The functional group present in esters is -COO-, which represents a carbonyl group bonded to an oxygen atom. This group is responsible for the characteristic fruity aroma of esters. Choice A, 'Hydroxyl,' refers to -OH, which is a characteristic group of alcohols, not esters. Choice B, 'Carbonyl,' is a broad term that includes various compounds with a C=O group, but specifically in esters, it is a carbonyl group bonded to an oxygen atom. Choice D, 'Amine,' refers to compounds containing a nitrogen atom bonded to hydrogen atoms or alkyl groups, which is not present in esters. Therefore, the correct answer is 'C: Ester.'

Which of the following is responsible for generating the electrical impulses that regulate the heartbeat?

  • A. Aorta
  • B. Pulmonary veins
  • C. Coronary arteries
  • D. Sinoatrial (SA) node
Correct Answer: D

Rationale: The Sinoatrial (SA) node is responsible for generating the electrical impulses that regulate the heartbeat. It is often referred to as the heart's natural pacemaker because it initiates the electrical signals that coordinate the heart's contractions. The other options listed (Aorta, Pulmonary veins, Coronary arteries) do not play a direct role in generating the electrical impulses for the heartbeat. The Aorta is a large artery that carries oxygen-rich blood away from the heart, the Pulmonary veins carry oxygen-rich blood from the lungs to the heart, and the Coronary arteries supply blood to the heart muscle itself, but none of them are involved in generating the electrical impulses that regulate the heartbeat.

What is the primary function of the epiglottis in the respiratory system?

  • A. Filtration of air
  • B. Production of mucus
  • C. Prevention of food entering the trachea
  • D. Oxygen exchange in the alveoli
Correct Answer: C

Rationale: The primary function of the epiglottis in the respiratory system is to prevent food from entering the trachea. During swallowing, the epiglottis covers the opening of the trachea, guiding food down the esophagus to the stomach and preventing it from entering the airway. This mechanism safeguards the respiratory system from foreign objects, ensuring proper air passage and avoiding potential choking hazards. Choices A, B, and D are incorrect: A) Filtration of air is mainly performed by the nasal hairs and the mucous membranes of the respiratory tract. B) Production of mucus is primarily carried out by the mucous glands in the respiratory system to trap particles and humidify the air. D) Oxygen exchange in the alveoli occurs in the lungs and is related to the process of respiration, not the function of the epiglottis.

What do Newton's rings visually demonstrate?

  • A. Diffraction
  • B. Doppler effect
  • C. Polarization
  • D. Thin-film interference
Correct Answer: D

Rationale: Newton's rings are a series of concentric colored rings observed when light is reflected between a spherical surface and a flat surface. This phenomenon is a result of thin-film interference, where light waves reflecting off the two surfaces interfere with each other constructively or destructively, leading to the observed pattern of rings. Diffraction, polarization, and the Doppler effect are not related to the specific phenomenon of Newton's rings. Diffraction refers to the bending of waves around obstacles, polarization deals with the orientation of electromagnetic waves, and the Doppler effect relates to the change in frequency of waves due to motion. Therefore, the correct answer is thin-film interference, as it precisely describes the phenomenon observed in Newton's rings.

What type of energy does an object in motion possess?

  • A. Potential energy
  • B. Kinetic energy
  • C. Thermal energy
  • D. Chemical energy
Correct Answer: B

Rationale: The correct answer is B. Kinetic energy is the energy possessed by an object in motion. When an object is in motion, it has the ability to do work due to its motion, which is known as kinetic energy. Potential energy, choice A, refers to stored energy that has the potential to do work but is not related to motion. Thermal energy, choice C, is related to the temperature of an object, not its motion. Chemical energy, choice D, is energy stored in the bonds of chemical compounds and is not directly related to an object's motion.

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