HESI Exams Quizlet Physics

HESI Exams Quizlet Physics Related

Review HESI Exams Quizlet Physics related questions and content

What is the purpose of a switch in a circuit?

  • A. To reverse the direction of alternating current
  • B. To increase the voltage of the battery or cell
  • C. To increase the resistance of wires in the circuit
  • D. To allow the circuit to open and close
Correct Answer: D

Rationale: The purpose of a switch in a circuit is to allow the circuit to open and close. When the switch is turned on, it provides a complete path for the current to flow through the circuit. When the switch is turned off, it breaks the circuit, stopping the flow of current. This function of opening and closing the circuit using a switch is essential for controlling the flow of electricity in various electrical devices and systems. Choices A, B, and C are incorrect because a switch does not reverse the direction of current, increase voltage, or increase resistance in a circuit; its primary function is to open and close the circuit.

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In a U-tube manometer, a fluid is used to measure pressure differences. When one side is connected to a pressurized system, the fluid level on that side will:

  • A. Remain the same
  • B. Decrease
  • C. Increase
  • D. Depend on the type of fluid used
Correct Answer: B

Rationale: In a U-tube manometer, the side connected to a pressurized system will experience a decrease in fluid level due to the pressure exerted by the system. This pressure forces the fluid down, causing the fluid level to decrease. Therefore, choice B is correct. Choices A and C are incorrect because the fluid level will not remain the same or increase when connected to a pressurized system. Choice D is incorrect as the type of fluid used does not determine the direction of the fluid movement in response to pressure.

A 0-kg block on a table is given a push so that it slides along the table. If the block is accelerated at 6 m/s2, what was the force applied to the block?

  • A. 0 N
  • B. 3 N
  • C. 6 N
  • D. The answer cannot be determined from the information given.
Correct Answer: A

Rationale: According to Newton's second law of motion,

F=ma. Since the block has a mass of 0 kg, the force applied must be 0 N, as no force is needed to move an object with zero mass.

Which of these objects has the greatest momentum?

  • A. A 1,250-kg car moving at 5 m/s
  • B. An 80-kg person running at 4 m/s
  • C. A 10-kg piece of meteorite moving at 600 m/s
  • D. A o.5-kg rock moving at 40 m/s
Correct Answer: A

Rationale: Momentum is the product of mass and velocity. The car has the highest momentum because it has the largest mass and a significant velocity.

A 3-volt flashlight uses a bulb with 60-ohm resistance. What current flows through the flashlight?

  • A. o.05 amp
  • B. o.5 amp
  • C. 1.8 amp
  • D. 18 amp
Correct Answer: A

Rationale: : Using Ohm's Law, I = V / R:
I = 3 / 60 = 0.05 amp.
So, the correct current is 0.05 amp.

Diamagnetism refers to a material's weak:

  • A. Attraction to magnetic fields
  • B. Repulsion to magnetic fields
  • C. Amplification of magnetic fields
  • D. Indifference to magnetic fields
Correct Answer: B

Rationale: Diamagnetism refers to a material's weak repulsion to magnetic fields. When diamagnetic materials are placed in an external magnetic field, they create an opposing magnetic field, leading to repulsion. This is why choice B, 'Repulsion to magnetic fields,' is the correct answer. Choices A, C, and D are incorrect because diamagnetic materials do not exhibit attraction, amplification, or indifference to magnetic fields.

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