CONSTRUCTION SCIENCE T LEVEL QUESTIONS

Name the seven base units of the Système Internationale d’Unités (SI).

Convert 5.2 terametres (Tm) to meters (m) using scientific notation.

• 5.2 x 10¹² m

• 5.2 x 10⁹ m

• 5.2 x 10⁶ m

• 5.2 x 10³ m

Define 'ductility' and give an example of a ductile material.

• Ductility is the ability to be drawn into a wire; example: gold

• Ductility is the ability to conduct electricity; example: copper

• Ductility is the ability to absorb moisture; example: sponge

• Ductility is the ability to reflect light; example: mirror

Explain the difference between tensile strength and compressive strength.

• Tensile strength resists tearing; compressive strength resists force

• Tensile strength resists heat; compressive strength resists cold

• Tensile strength resists electricity; compressive strength resists magnetism

• Tensile strength resists light; compressive strength resists darkness

List three factors that contribute to the degradation of materials over time.

• Temperature, humidity, and pressure

• Time, ultraviolet (UV) light, and weathering from the elements

• Chemical reactions, friction, and sound

• Light, sound, and magnetism

State Newton's second law of motion and explain what each symbol in the formula represents.

• F = ma, where F is force, m is mass, and a is acceleration

• F = ma, where F is frequency, m is momentum, and a is area

• F = ma, where F is force, m is momentum, and a is area

• F = ma, where F is frequency, m is mass, and a is acceleration

A truck weighs 40,000 kg and accelerates at 0.25 m/s². Calculate the force required for this acceleration.

• 10,000 N

• 20,000 N

• 5,000 N

• 15,000 N

Define 'work done' in mechanical terms and state its SI unit.

• Work done is the energy transferred when a force causes displacement; SI unit is joule (J)

• Work done is the energy stored in an object; SI unit is watt (W)

• Work done is the energy lost due to friction; SI unit is newton (N)

• Work done is the energy gained from heat; SI unit is calorie (cal)

A lift moves a person weighing 700 N a distance of 40 m. Calculate the work done.

• 28,000 J or 28 kJ

• 14,000 J or 14 kJ

• 35,000 J or 35 kJ

• 21,000 J or 21 kJ

State Ohm's law and give the SI units for voltage, current, and resistance.

• V = IR; voltage in volts (V), current in amperes (A), resistance in ohms (Ω)

• V = IR; voltage in watts (W), current in amperes (A), resistance in ohms (Ω)

• V = IR; voltage in volts (V), current in ohms (Ω), resistance in amperes (A)

• V = IR; voltage in joules (J), current in amperes (A), resistance in ohms (Ω)