Polytechnic Engineering Fundamentals 2

Question 1

What is the First Law of Thermodynamics?

Accepted Answer

Energy cannot be created or destroyed, only converted

Answer

Heat flows from cold to hot

Answer

Entropy always increases in an isolated system

Answer

Work is the product of force and displacement

Question 2

What is the SI unit of power?

Accepted Answer

Watt (W)

Answer

Joule (J)

Answer

Newton (N)

Answer

Pascal (Pa)

Question 3

What does Kirchhoff's Current Law (KCL) state?

Accepted Answer

The sum of currents entering a node equals the sum of currents leaving it

Answer

Voltage is the same across all parallel branches

Answer

Total resistance in series is the sum of individual resistances

Answer

Power dissipated equals current squared times resistance

Question 4

Which material property describes resistance to plastic deformation?

Accepted Answer

Hardness

Answer

Toughness

Answer

Ductility

Answer

Brittleness

Question 5

What is the purpose of a capacitor in a circuit?

Accepted Answer

To store electrical energy in an electric field

Answer

To convert AC to DC

Answer

To amplify electrical signals

Answer

To regulate current flow

Question 6

What is the formula for kinetic energy?

Accepted Answer

KE = ½mv²

Answer

KE = mv

Answer

KE = mgh

Answer

KE = ½mv