🛠️ Simple Machines
Which of the following is NOT a simple machine?
A. Pulley
B. Screw
C. Gear
D. Wedge
C. Gear
How many milliliters are in 2.5 liters?
A. 250 ml
B. 2,500 ml
C. 25 ml
D. 0.25 ml
B. 2,500 ml
Which of the following best defines a "hypothesis"?
A. A step-by-step plan
B. A variable to be measured
C. A proposed explanation based on prior knowledge
D. A result of an experiment
C. A proposed explanation based on prior knowledge
Which of the following is the primary reason for wearing safety goggles in industrial environments?
A. To improve visibility
B. To prevent dust allergies
C. To protect eyes from chemical splashes and flying debris
D. To reduce screen glare
C. To protect eyes from chemical splashes and flying debris
I have keys but no locks. I have space but no room. You can enter but can’t go outside. What am I?
A. Keyboard
B. Safe
C. Calculator
D. Door
A. Keyboard
Which simple machine converts rotational force into vertical motion, such as in a drill?
A. Lever
B. Pulley
C. Screw
D. Wheel and Axle
C. Screw
A component is measured as 4 inches long. What is this length in centimeters? (1 inch = 2.54 cm)
A. 10.16 cm
B. 8.22 cm
C. 5.08 cm
D. 12.7 cm
A. 10.16 cm
What section of a project proposal identifies the research aim and question?
A. Results
B. Abstract
C. Introduction
D. Methodology
C. Introduction
Which statement best describes the proper use of safety gloves when handling chemicals?
A. All gloves offer equal protection
B. Only latex gloves are chemical-resistant
C. Gloves must be chosen based on the chemical type and exposure risk
D. Thick gloves are always safer regardless of material
C. Gloves must be chosen based on the chemical type and exposure risk
I orbit a star, yet I’m not a planet. I reflect light, yet I’m not a mirror. I influence tides but float in space. What am I?
A. Comet
B. Moon
C. Meteorite
D. Satellite
B. Moon
Which combination of machines is used in a bicycle’s gear system?
A. Lever and pulley
B. Wheel and axle with gears
C. Screw and inclined plane
D. Pulley and wedge
B. Wheel and axle with gears
Which of these best describes a measurement with high precision but low accuracy?
A. Close to the true value but inconsistent
B. Far from the true value but consistent
C. Random and inaccurate
D. Always equal to the expected value
B. Far from the true value but consistent
In the scientific method, which step follows data collection?
A. Formulating a hypothesis
B. Designing an experiment
C. Drawing a conclusion
D. Stating the objective
C. Drawing a conclusion
Why is it important for workplaces to have trained paramedics or first aid responders?
A. To reduce insurance costs
B. To replace hospital staff during emergencies
C. To provide immediate medical care and stabilize injuries before professionals arrive
D. To discipline employees violating safety rules
C. To provide immediate medical care and stabilize injuries before professionals arrive
The more you take from me, the bigger I become. What am I?
A. A balloon
B. A hole
C. A shadow
D. A volcano
B. A hole
Which principle explains why using a lever reduces the amount of force needed to lift an object?
A. Law of Thermodynamics
B. Mechanical Advantage
C. Electromagnetic Induction
D. Pascal’s Law
B. Mechanical Advantage
Which of the following tools would be best for measuring the diameter of a wire accurately?
A. Tape measure
B. Caliper
C. Ruler
D. Protractor
B. Caliper
What is the independent variable in this research question: “How does temperature affect the viscosity of oil?”
A. Viscosity
B. Oil
C. Temperature
D. Measurement tool
C. Temperature
Which of the following scenarios best represents a “physical hazard” in the workplace?
A. Unlabeled toxic container
B. Wet floor with no warning sign
C. Incorrect data on a safety report
D. Harassment complaint
B. Wet floor with no warning sign
What has mass and volume, but is invisible to the eye?
A. Metal
B. Energy
C. Air
D. Vapor
C. Air
If a lever has a long arm and a short load distance, what happens to the effort required?
A. It increases exponentially
B. It becomes zero
C. It decreases significantly
D. It stays the same
C. It decreases significantly
Which of the following is a unit of force in the metric system?
A. Pound
B. Newton
C. Inch
D. Joule
B. Newton
In an engineering project proposal, which part evaluates the potential challenges and limitations of your experiment?
A. Hypothesis
B. Budget
C. Risk Assessment
D. Data Analysis
C. Risk Assessment
You see a red fire extinguisher labeled “CO₂.” What type of fire should it be used on?
A. Wood or paper fire
B. Flammable liquids and electrical fires
C. Cooking oil fires
D. Metal fires
B. Flammable liquids and electrical fires
You measure my life in hours, I serve you by expiring. I die when I’m fed, I grow when I’m thin. What am I?
A. Time
B. Shadow
C. Fire
D. Bacteria
C. Fire