Grade 9 Technology

Which part of a rack-and-pinion gear set rotates?

• pinion gear

• rack gear

Which part of a rack-and-pinion gear set moves in a straight line?

• rack gear

• pinion gear

If the distance between two teeth on the rack is 3cm, and the pinion has 18 teeth, how far will the rack move if the pinion makes one full revolution?

• 54cm

• 62cm

• 58cm

• 50cm

How a structure should be constructed, the size it should be, the types of materials that are used to construct it are all part of the structure's...

• load

• design

• force

• function

Corrosion resistance is the property of a material that...

• allows heat to be conducted

• prevents the action of substances such as acids, alkalis, and gases which tends to cause oxidisation

• allows the action of substances such as acids, alkalis, and gases which causes mineralisation.

• enables the formation of permanent deformation in a material.

Concrete has a relatively high...

• tensile strength

• torsion strength

• bending strength

• compressive strength

Which symbol represents first angle orthographic projection?

• 
• 
• 
• 

What type of gearing system would be used to move this gate?

• rack-and-pinion

• pulley system

• bevel system

• spur system

Name the main mechanism used in this illustration

(a)  

Which type of compound system is this?

• block and tackle

• fixed

• movable

• groovy