Technology Revision Term 3 and 4 Set 1

What is the unit of measurement for current?

• Volt
• Ampere
• Ohm
• Watt

Answer explanation

Current is measured in Amperes (A).

Which component allows current to flow in one direction only?

• Resistor
• Capacitor
• Diode
• Transistor

Answer explanation

A diode allows current to flow in one direction only.

What does LED stand for?

• Light Emitting Diode
• Light Enhancing Device
• Low Energy Diode
• Light Emitting Device

Answer explanation

LED stands for Light Emitting Diode.

Which of the following is NOT a thermoplastic?

• PET
• HDPE
• PVC
• Thermosetting polymer

Answer explanation

Thermosetting polymers are not thermoplastics. They are a separate category of plastics.

What is the purpose of the Resistor Color Code?

• To make resistors look colorful
• To indicate the resistance value
• To show the manufacturing date
• To identify the manufacturer

Answer explanation

The Resistor Color Code is used to indicate the resistance value of a resistor.

Which of the following is a characteristic of thermoplastics?

• Can be moulded only once
• Cannot be reshaped when heated
• Can be moulded again and again
• Always opaque

Answer explanation

Thermoplastics can be moulded again and again when heated.

What does PET stand for in plastic recycling?

• Polyethylene Terephthalate
• Polyester Tetrafluoroethylene
• Polyethylene Tetrachloride
• Polystyrene Ethylene Terephthalate

Answer explanation

PET stands for Polyethylene Terephthalate in plastic recycling.

Which of the following is NOT a method of food preservation?

• Pickling
• Drying
• Salting
• Rusting

Answer explanation

Rusting is not a method of food preservation. It's a process that occurs in metals.

What causes rust?

• Exposure to sunlight
• Chemical reaction between metal and oxygen
• Exposure to cold temperatures
• Contact with plastic

Answer explanation

Rust is caused by a chemical reaction between metal and oxygen, known as oxidation.

Which of the following is a way to prevent rust?

• Exposing metal to water
• Scraping off the outer layer
• Painting
• Heating the metal

Answer explanation

Painting is a common method to prevent rust by creating a barrier between the metal and oxygen.