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Question 1: What is the term for a device that uses electricity to perform work, such as a light bulb?
- Power source
- Conductor
- Electrical load
- Insulator
Answer: C. Electrical load
Explanation: An electrical load is defined as any device or component in a circuit that consumes electrical energy to perform a specific task or work.
Question 2: When you rub a balloon on your hair, why does your hair stand up?
- Opposite charges attract
- Magnetic force
- Like charges repel
- Gravity
Answer: C. Like charges repel
Explanation: Rubbing a balloon on hair transfers electrons, creating a charge. Since the hair strands gain the same charge, they repel each other, causing them to stand up.
Question 3: In a simple battery circuit, which direction do electrons flow through the wire?
- Negative to positive
- Center to edge
- Clockwise only
- Positive to negative
Answer: A. Negative to positive
Explanation: In a standard electrical circuit powered by a battery, electrons are pushed from the negative terminal, through the load, and toward the positive terminal.
Question 4: Which household appliance uses electricity to run a compressor to keep food cold?
- Alarm clock
- Refrigerator
- Toaster
- Light bulb
Answer: B. Refrigerator
Explanation: Electric refrigerators rely on electricity to power a compressor, which circulates refrigerant to cool the interior and preserve food items effectively.
Question 5: What is the primary mechanism a toaster uses to brown bread?
- Convection fan
- Light beams
- Heating coils
- Microwave radiation
Answer: C. Heating coils
Explanation: A toaster functions by passing electricity through internal coils, which creates heat that toasts the bread through direct thermal radiation.
Question 6: Which of these is a common laboratory device powered by electricity?
- Glass beaker
- Metal spatula
- Wooden ruler
- Centrifuge
Answer: D. Centrifuge
Explanation: A centrifuge is a standard piece of laboratory equipment that uses an electric motor to spin samples at high speeds for scientific research.
Question 7: What causes the shock felt when touching an object after walking on a carpet?
- Chemical reaction
- Magnetic induction
- Static electricity
- Current electricity
Answer: C. Static electricity
Explanation: Static electricity is the buildup of charge that occurs when electrons jump between surfaces, such as when walking across a carpeted floor.
Question 8: What component provides the energy for an electric vehicle's motor to run?
- Wind turbine
- Fuel tank
- Solar panel
- Onboard battery
Answer: D. Onboard battery
Explanation: Electric vehicles (EVs) store electrical energy in large onboard batteries, which then supply the power necessary to run the vehicle's electric motor.
Question 9: Which of these public devices relies on electricity to function?
- Wooden bench
- Metal fence
- Stone statue
- Traffic light
Answer: D. Traffic light
Explanation: Traffic lights are essential public infrastructure that require a constant supply of electricity to operate their signaling systems and manage road safety.
Question 10: What happens to a battery-powered alarm clock if the power source is removed?
- It stops working
- It becomes magnetic
- It reverses time
- It speeds up
Answer: A. It stops working
Explanation: An alarm clock requires a continuous stream of electricity to maintain its internal timing mechanism; without power, the device ceases to function.