WorksheetsEngineering Concepts Quiz for Grade 9
Total questions: 35
Worksheet time: 22mins
What is the primary function of a gear in a mechanical system?
To increase friction
To transmit torque
To store energy
To reduce noise
Which of the following is a characteristic of a parallel circuit?
The current is the same through all components
The voltage is the same across all components
The resistance is the same across all components
The power is the same across all components
In the engineering design process, what is the purpose of the "Define the Problem" step?
To brainstorm solutions
To test prototypes
To identify the needs and constraints
To build a model
Calculate the mechanical advantage of a lever with an effort arm of 4 meters and a load arm of 2 meters.
1
2
4
8
If a resistor of 5 ohms is connected in series with a 10-ohm resistor, what is the total resistance?
5 ohms
10 ohms
15 ohms
50 ohms
During the engineering design process, why is it important to test a prototype?
To finalize the design
To identify potential improvements
To reduce costs
To increase production speed
A mechanical system uses a pulley to lift a load. If the input force is 50 N and the output force is 200 N, what is the mechanical advantage of the pulley system?
0.25
2
4
8
Analyze the following circuit: A 12V battery is connected in series with a 4-ohm and a 6-ohm resistor. What is the current flowing through the circuit?
0.5 A
1 A
1.2 A
2 A
In the context of the engineering design process, how would you evaluate the effectiveness of a solution?
By comparing it to the initial problem statement
By checking if it uses the least amount of materials
By ensuring it is the most expensive option
By seeing if it looks aesthetically pleasing
What is the function of a capacitor in an electrical circuit?
To store electrical energy
To increase current
To decrease voltage
To convert AC to DC
Which of the following is a step in the engineering design process?
Conducting a survey
Defining the problem
Writing a report
Selling the product
If a simple machine has an input force of 10 N and an output force of 50 N, what is its mechanical advantage?
0.2
1
5
10
In a parallel circuit with a 12V battery, if one branch has a resistance of 6 ohms and another branch has a resistance of 3 ohms, what is the total current supplied by the battery?
2 A
4 A
6 A
8 A
Why is brainstorming an important step in the engineering design process?
It helps in reducing the cost of the project
It allows for the generation of multiple ideas and solutions
It ensures the final product is aesthetically pleasing
It guarantees the success of the project
A circuit consists of a 9V battery and three resistors of 3 ohms each connected in series. What is the total resistance of the circuit?
3 ohms
6 ohms
9 ohms
12 ohms
The ramp height is 25 feet. The length of the ramp is 75 feet. What is the mechanical advantage of the ramp?
75
3
1/3
25
If a pulley system has a mechanical advantage of 4, what does that mean?
This means that it is 4 times easier to lift this load.
This means you only need a quarter of the effort to lift the load.
For example, if you lifted 100 kg, it would only take 25 kg of effort.
All of the above
Mechanical advantage is the output divided by the input on a machine. The higher the number, the least amount of _______ is used.
force
work
distance
power
What is the advantage of using a longer handled wrench?
There's more enough room for both hands
it's easier to grip
It produces more torque
it has a better fit with more sizes of bolts
When you build your prototype it is really important to do this...
Rebuild it
Test it many times
Present it
In the design process, it is okay to make many prototypes and test them instead of choosing one solution to try.
True
False
Your friend Rohan tells you that he has a great idea for a different kind of shoe. To help explain his idea, Rohan constructs a version of his shoe from materials he finds in his home. Rohan’s shoe is known as a
___________________
prototype.
solution.
experiment.
variable.
What is the First Step of the Engineering Design Process?
Testing Solutions
Designing Solutions
Identifying the Problem
Planning Solutions
Creating a final technical drawing using everyones ideas would be done during which step in the design process?
Generate concepts
Build and test
Share or present
Develop a solution
What is the function of a switch in an electrical circuit?
To increase the voltage
To decrease the resistance
To open or close the circuit
To convert AC to DC
Why do bulbs in a series circuit glow less brightly than those in a parallel circuit?
Because in a series circuit, the voltage is divided among the bulbs
Because in a series circuit, the resistance is lower
Because in a parallel circuit, each bulb receives the full voltage of the power source
Because in a parallel circuit, the current is weaker
What is effort (input) force?
the force one exerts on a machine
the force which an effort force must overcome in order to do work on an object via a simple machine.
the force the machine exerts on a object
the output work times the input distance
Based on the graph, which of the following would be true regarding the relationship of voltage and current?
As voltage increases, current decreases.
Voltage will not affect current.
As voltage decreases, current increases.
As voltage increases, current also increases.
