SCE Engineering Sciences 1

Question 1

What is Newton's second law of motion?

Accepted Answer

F = ma (force equals mass times acceleration)

Answer

Newton's second law states that the net force acting on an object equals its mass multiplied by its acceleration (F = ma), forming the foundation of dynamics.

Question 2

The coefficient of thermal expansion is a measure of:

Accepted Answer

How much a material expands per degree of temperature change

Answer

The coefficient of thermal expansion (α) quantifies the fractional change in length, area, or volume per unit temperature change, critical for designing structures in Saudi Arabia's extreme temperatures.

Question 3

Hooke's Law states that stress is proportional to strain within the:

Accepted Answer

Elastic limit

Answer

Hooke's Law (σ = Eε) applies only within the elastic region where deformation is reversible. Beyond the elastic limit, permanent plastic deformation occurs.

Question 4

The first law of thermodynamics is a statement of:

Accepted Answer

Conservation of energy

Answer

The first law states that energy cannot be created or destroyed, only converted between forms. For a closed system, ΔU = Q - W (internal energy change equals heat added minus work done).

Question 5

Young's modulus is defined as the ratio of:

Accepted Answer

Stress to strain in the elastic region

Answer

Young's modulus (E) = stress/strain = (F/A)/(ΔL/L) in the elastic region. It measures a material's stiffness. Steel has E ≈ 200 GPa, concrete ≈ 25-30 GPa.

SCE Engineering Practice Test

SCE Engineering Practice Test

SCE Engineering Sciences 1