Square cylinder

Square piston

Cylinder bore equal to stroke length

None of these

Air filter

Battery

Exhaust silencer

Fuel injector

1-3-5-2-4-6

1-5-3-6-2-4

1-4-2-6-3-5

1-6-3-5-2-4

Pascal's law

Buoyancy principle

Venture principle

Pitot tube principle

Pig iron

White cast iron

Wrought iron

Ductile cast iron