HESI A2
HESI A2 Physics Practice Test Questions
Question 1 of 5
In an electrically neutral atom, the number of:
Correct Answer: A
Rationale: Rationale: 1. Atoms are electrically neutral, meaning they have no overall charge. 2. Electrons are negatively charged, and protons are positively charged. 3. In a neutral atom, the number of protons equals the number of electrons to balance charges. 4. Therefore, in an electrically neutral atom, the number of electrons is equal to the number of protons (Choice A). Summary: - Choice B is incorrect because protons are not always equal to neutrons in an atom. - Choice C is incorrect as the number of neutrons can vary and is not always greater than protons. - Choice D is incorrect as electrons can be equal to or greater than protons in an atom, depending on the element.
Question 2 of 5
A hummingbird's wings beat at 25 beats per second. What is the period of the wing beating in seconds?
Correct Answer: A
Rationale: To find the period, we use the formula: Period = 1 / Frequency. Given the frequency as 25 beats per second, we calculate 1 / 25 = 0.04 seconds. Therefore, the correct answer is A. Choice B (0.25 s) is incorrect as it represents the inverse of the frequency, not the period. Choice C (0.4 s) and D (4 s) are also incorrect as they are not the correct calculations based on the given frequency.
Question 3 of 5
What is the phenomenon by which light bends as it passes through a prism known as?
Correct Answer: D
Rationale: The correct answer is D: Refraction. Refraction is the phenomenon of light bending as it passes through different mediums, such as a prism. This occurs due to the change in speed of light when transitioning from one medium to another, causing the light to change direction. Reflection (A) is the bouncing back of light off a surface, not bending. Electrical conduction (B) is the movement of electric charges through a material, not related to light behavior. Diffraction (C) is the bending of light around obstacles or through small openings, not specifically related to prisms.
Question 4 of 5
Fluids can be categorized based on their shear stress-strain rate relationship. An ideal fluid exhibits:
Correct Answer: A
Rationale: Rationale: An ideal fluid exhibits zero shear stress at any strain rate. This is because an ideal fluid is assumed to have no resistance to flow, resulting in no shear stress being generated regardless of the strain rate. This is a fundamental characteristic of an ideal fluid and distinguishes it from real fluids that exhibit varying levels of shear stress. Summary: - Choice A is correct as an ideal fluid exhibits zero shear stress at any strain rate. - Choice B is incorrect as it describes a Newtonian fluid which has a linear relationship between shear stress and strain rate. - Choice C is incorrect as it describes a Non-Newtonian fluid with a non-linear relationship between shear stress and strain rate. - Choice D is incorrect as it describes the temperature dependence of viscosity, which is not a defining characteristic of an ideal fluid.
Question 5 of 5
What is the kinetic energy of a 500-kg wagon moving at 10 m/s?
Correct Answer: C
Rationale: To calculate kinetic energy, we use the formula KE = 0.5 * mass * velocity^2. Plugging in the values (0.5 * 500 kg * (10 m/s)^2), we get 0.5 * 500 * 100 = 25000 J. Therefore, the correct answer is C (2.5 * 10^4 J). Choice A (50 J) is incorrect as it is too low. Choice B (250 J) is incorrect, as it only considers the mass without accounting for the velocity. Choice D (5.0 * 10^5 J) is incorrect as it overestimates the kinetic energy due to incorrect calculations.
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