ati teas 7 science

Correct Answer: C

Rationale: The correct answer is C: Exceptional stability of the nucleus. Magic numbers are specific numbers of protons or neutrons that result in a more stable nucleus due to the arrangement of nucleons in energy levels. This stability is a result of closed shells, leading to lower energy states and less tendency for decay. Choices A and B are incorrect as magic numbers actually contribute to increased stability, leading to decreased nuclear instability and lower radioactive decay rates. Choice D is incorrect because magic numbers do not lead to increased instability or enhanced decay rates, but rather to exceptional stability.

Correct Answer: D

Rationale: The correct answer is D: Solar energy to electrical energy. Solar cells, also known as photovoltaic cells, convert sunlight (solar energy) directly into electricity through the photovoltaic effect. When sunlight hits the solar cell, photons from the sunlight are absorbed by the semiconducting material in the cell, creating an electric current. This process allows solar cells to generate electricity without moving parts or the need for any other energy sources. Explanation for other choices: A: Electrical energy to light energy - This is incorrect as solar cells do not convert electrical energy into light energy, but rather convert solar energy into electrical energy. B: Chemical energy to electrical energy - This is incorrect as solar cells do not involve any chemical reactions to produce electricity. C: Solar energy to thermal energy - This is incorrect as solar cells are designed to convert solar energy directly into electrical energy, not thermal energy.

Correct Answer: A

Rationale: The correct answer is A: Hydrogen bonding. Water molecules exhibit hydrogen bonding, where the partially positive hydrogen of one water molecule is attracted to the partially negative oxygen of another water molecule. This strong intermolecular force leads to the cohesive forces that create high surface tension in water. B: London dispersion forces are weaker and do not contribute significantly to water's high surface tension. C: Ionic bonding involves the transfer of electrons between atoms, not relevant to water's surface tension. D: Metallic bonding occurs in metals and is not related to the surface tension of water.

Correct Answer: D

Rationale: The correct answer is D: Dependent, y. In experimental design, the dependent variable is the variable being measured as a possible effect, and it is typically plotted on the y-axis of a graph. This variable is what researchers are observing or testing to see if it changes in response to the manipulation of the independent variable. The independent variable, on the other hand, is what is being manipulated or controlled in the experiment and is usually plotted on the x-axis. Therefore, in a standard experimental design setup, the dependent variable is represented on the y-axis to show the relationship between it and the independent variable on the x-axis. Choices A, B, and C are incorrect because they do not align with the conventional practice of plotting the dependent variable on the y-axis.

Correct Answer: C

Rationale: The primary function of the lymphatic system is to fight infection and remove excess fluid. Lymph nodes contain white blood cells that help fight pathogens. Lymphatic vessels collect excess fluid from tissues and transport it back to the bloodstream, aiding in immune response. Other choices are incorrect because A: Oxygen transport is primarily done by the circulatory system, B: Blood filtration is mainly carried out by the kidneys, and D: Hormone transport is primarily through the circulatory system.