TEAS 7 science practice

TEAS 7 science practice Related

Review TEAS 7 science practice related questions and content

What happens to the work done on an object when the angle between the force and displacement is 90 degrees?

  • A. Maximum work is done
  • B. No work is done
  • C. Minimum work is done
  • D. Work is infinite
Correct Answer: B

Rationale: When the angle between the force and displacement is 90 degrees, the work done is given by the formula W = F * d * cos(theta), where theta is the angle between the force and displacement vectors. Since cos(90 degrees) = 0, the work done becomes zero. This means that no work is done on the object when the angle between the force and displacement is 90 degrees. Choice A is incorrect because maximum work is done when the force and displacement are in the same direction (theta = 0 degrees). Choice C is incorrect as minimum work is done when the force and displacement are parallel (theta = 0 degrees), not perpendicular. Choice D is incorrect because work cannot be infinite; it depends on the force, displacement, and the cosine of the angle between them.

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Which part of the brainstem is responsible for controlling vital functions such as heart rate, blood pressure, and breathing?

  • A. Medulla oblongata
  • B. Pons
  • C. Midbrain
  • D. Cerebellum
Correct Answer: A

Rationale: The medulla oblongata is the correct answer. It is responsible for controlling vital functions such as heart rate, blood pressure, and breathing. This part of the brainstem contains centers that regulate these essential autonomic functions to maintain homeostasis in the body. The pons and midbrain are also parts of the brainstem, but they are not primarily responsible for controlling these vital functions. The cerebellum, on the other hand, is involved in coordination and balance, not in regulating vital functions like heart rate, blood pressure, and breathing.

What condition is characterized by progressive muscle weakness and wasting?

  • A. Muscular dystrophy
  • B. Myositis
  • C. Fibromyalgia
  • D. Carpal tunnel syndrome
Correct Answer: A

Rationale: Muscular dystrophy is a genetic disorder characterized by progressive muscle weakness and wasting due to mutations in genes responsible for muscle cells' structure and function. Myositis is an inflammatory muscle disease, fibromyalgia is a chronic pain condition, and carpal tunnel syndrome affects the hand and arm nerves, but none present with the progressive muscle weakness and wasting seen in muscular dystrophy.

During inhalation, which muscle contracts to increase the volume of the thoracic cavity, allowing air to flow into the lungs?

  • A. Diaphragm
  • B. Intercostal muscles
  • C. Abdominal muscles
  • D. Pectoral muscles
Correct Answer: A

Rationale: The diaphragm is the primary muscle responsible for inhalation. When it contracts, it moves downward, increasing the volume of the thoracic cavity and creating a pressure gradient that allows air to flow into the lungs. While the intercostal muscles also play a role in expanding the chest cavity during inhalation, the diaphragm is the main muscle involved in this process. Abdominal muscles and pectoral muscles are not directly involved in the process of inhalation.

What is the external body covering, providing protection and contributing to temperature regulation, composed of?

  • A. Muscle tissue
  • B. Epithelial tissue (skin)
  • C. Bone marrow
  • D. Cartilage
Correct Answer: B

Rationale: The external body covering, which is the skin, is composed of epithelial tissue. Epithelial tissue serves as a protective barrier against pathogens, chemicals, and physical damage. It also helps regulate body temperature through processes like sweating. Choice A (Muscle tissue) is incorrect as muscles are responsible for movement and not the external body covering. Choice C (Bone marrow) is incorrect as it is a component of the skeletal system and not the external body covering. Choice D (Cartilage) is incorrect as cartilage is a type of connective tissue found in joints and the structure of some body parts, not the external body covering.

What is the relationship between work and energy?

  • A. Work is the rate of energy transfer
  • B. Work and energy are the same concepts
  • C. Work is the result of energy
  • D. Work changes an object's energy from one form to another
Correct Answer: A

Rationale: Work is defined as the transfer of energy from one system to another. It is the rate at which energy is transferred or converted. Therefore, work is the rate of energy transfer, making option A the correct choice. Work involves the transfer or conversion of energy, but it is not the same as energy itself, nor is it the result of energy. Additionally, work does not change an object's energy from one form to another; instead, it involves the transfer of energy.

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