Mechanical Aptitude Principles Questions and Answers 2

Question 1

What is the principle of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed

Answer

The law of conservation of energy states that energy cannot be created or destroyed — it can only be transformed from one form to another. The total energy in a closed system remains constant.

Question 2

What is Hooke's Law?

Accepted Answer

The extension of a spring is proportional to the applied force

Answer

Hooke's Law states that the deformation (extension or compression) of an elastic material is directly proportional to the force applied, within the elastic limit: F = kx, where k is the spring constant and x is the deformation.

Question 3

What does the principle of moments state?

Accepted Answer

For a body in rotational equilibrium, the sum of clockwise moments equals the sum of counterclockwise moments

Answer

The principle of moments states that for a system in rotational equilibrium, the total clockwise moments about any point equal the total counterclockwise moments. A moment is force multiplied by perpendicular distance from the pivot.

Question 4

What is the efficiency of a machine that outputs 750J of useful work from 1000J of input energy?

Accepted Answer

75%

Answer

Efficiency = (useful output / total input) × 100% = (750/1000) × 100% = 75%. The remaining 25% (250J) is lost to friction, heat, sound, or other non-useful energy forms.

Question 5

What does Pascal's principle state about pressure in a confined fluid?

Accepted Answer

Pressure applied to a confined fluid is transmitted equally in all directions

Answer

Pascal's principle states that pressure applied to an enclosed, incompressible fluid is transmitted undiminished and equally to every point in the fluid and to the walls of its container. This is the foundation of all hydraulic systems.

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Test Practice Test

Mechanical Aptitude Principles Questions and Answers 2