Nursing Elites

1. What is the term for the distance between the center of a lens or curved mirror and its focal point?

• A. Aperture
• B. Focal length
• C. Refractive index
• D. Lens thickness

Correct answer:

Rationale: The focal length of a lens or curved mirror is the distance between its center and the focal point, where parallel light rays converge or appear to diverge from.

2. What type of particle carries no charge and mediates the strong nuclear force between protons and neutrons?

• A. Electron
• B. Photon
• C. Gluon
• D. Neutrino

Correct answer: C

Rationale: Gluons are the force carriers of the strong nuclear force, holding protons and neutrons together within the nucleus.

3. What is the formula to calculate gravitational potential energy near the Earth's surface?

• A. Potential Energy=Mass×Acceleration
• B. Potential Energy=Force×Distance
• C. Potential Energy=Mass×Height×Gravity
• D. Potential Energy=Mass×Acceleration due to gravity×Height

Correct answer: d

Rationale: Gravitational potential energy near the Earth's surface is given by the formula PE = � × � × ℎ PE=m×g×h, where � m is mass, � g is acceleration due to gravity, and ℎ h is heigh

4. A person is pushing a box across the floor. Which of the following forces is NOT doing work?

• A. The person's pushing force
• B. The normal force from the floor
• C. The gravitational force on the box
• D. The frictional force between the box and the floor

Correct answer: A

Rationale: Work is defined as the force applied in the direction of motion multiplied by the distance moved. Since the normal force acts perpendicular to the motion, it does not contribute to work.

5. What kind of lens focuses parallel light rays to a single point?

• A. Concave lens
• B. Convex lens
• C. Cylindrical lens
• D. Plano lens

Correct answer: B

Rationale: Convex lenses (converging lenses) bend incoming light rays inwards, focusing them to a point called the focal point.

6. Which property of a substance describes how much matter is packed into a given space?

• A. Mass
• B. Volume
• C. Weight
• D. Density

Correct answer: D

Rationale: Density is the property of a substance that describes how much matter is packed into a given space. It is calculated by dividing the mass of the substance by its volume. Mass refers to the amount of matter in an object, volume is the amount of space an object occupies, and weight is the force of gravity acting on an object's mass. Density specifically relates to how tightly packed the particles of a substance are.

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