WorksheetsMaterials and Mechanisms Worksheet
Total questions: 30
Worksheet time: 15mins
What is the primary goal of material selection in engineering design?
Reduce cost only
Improve appearance
Match material properties to application needs
Use the strongest material available
Which property describes a material’s ability to resist breaking under tension?
Hardness
Ductility
Tensile strength
Elasticity
Which material property allows a material to return to its original shape after deformation?
Plasticity
Elasticity
Brittleness
Density
Which test is commonly used to determine material hardness?
Tensile test
Compression test
Impact test
Hardness test
Which material property measures resistance to surface wear or scratching?
Toughness
Hardness
Elasticity
Conductivity
Which material would best absorb impact without breaking?
Glass
Ceramic
Rubber
Concrete
What does ductility describe?
Ability to resist heat
Ability to stretch into a wire
Ability to resist corrosion
Ability to conduct electricity
Which factor is LEAST important when selecting materials?
Cost
Environmental impact
Color preference
Mechanical properties
Which test measures how a material reacts to sudden force?
Tensile test
Fatigue test
Impact test
Compression test
A brittle material will typically:
Stretch before breaking
Bend permanently
Break suddenly without much deformation
Absorb high impact energy
Which material property relates to mass per unit volume?
Density
Weight
Hardness
Strength
Why is material testing important in engineering?
To increase production speed
To confirm material performance and safety
To reduce design steps
To eliminate prototypes
Which material is most suitable for electrical insulation?
Copper
Aluminum
Rubber
Steel
Which material property indicates resistance to repeated loading?
Elasticity
Fatigue strength
Ductility
Conductivity
Engineers often use material data charts to:
Choose the cheapest material
Compare material properties efficiently
Avoid testing
Improve aesthetics
What is a mechanism?
A single machine part
An electrical system
A group of moving parts that transmit motion and force
A computer program
Which mechanism is commonly used to change speed and torque?
Lever
Pulley
Gear
Cam
Which mechanism changes the direction of force?
Gear
Pulley
Cam
Linkage
A crowbar is an example of which mechanism?
Gear
Pulley
Lever
Cam
What is the input force?
The force produced by the mechanism
The force applied to start the mechanism
The friction force
The output load
Mechanical advantage is defined as:
Input force ÷ output force
Output force ÷ input force
Speed ÷ distance
Distance ÷ speed
If a mechanism has a mechanical advantage of 5, it means:
It increases speed
It reduces efficiency
Output force is 5 times input force
Input force is greater than output
Which mechanism converts rotational motion into linear motion?
Gear
Pulley
Cam
Lever
Bicycle gears are used primarily to:
Change color
Increase friction
Adjust speed and torque
Reduce wheel size
Which mechanism connects parts to transfer motion between them?
Cam
Linkage
Gear
Pulley
Why are mechanisms important in engineering?
They increase system weight
They make machines inefficient
They enable machines to perform useful work
They replace electricity
Which is a real-world application of pulleys?
Engine valves
Bicycle chains
Construction cranes
Door hinges
Which challenge involves minimizing wasted energy?
Cost control
Space limitation
Efficiency optimization
Material selection
Which modern technology is influencing future mechanisms?
Hand tools
Artificial intelligence
Steam engines
Wooden gears
What is the first step in designing a mechanism?
Prototyping
Sketching
Problem definition
Testing
