SOLD MOLD

1. What is the purpose of flux in soldering?

• To strengthen the solder joint

• To increase the melting point of the solder

• To clean and remove oxidation from surfaces

• To make the solder joint more flexible

If a resistor has color bands of brown, black, and red, what is its resistance value?

• 10 ohms

• 100 ohms

• 1000 ohms

• 10000 ohms

Which of the following materials is commonly used to make fixed resistors?

• copper

• aluminium

• carbon

• silver

What is the purpose of using resistors in series with LEDs in an LED circuit?

• To increase the brightness of LED

• To protect the LED from over current

• To reduce the voltage across the LED

• To change the color of the LED

Which type of resistor changes its resistance with changes in temperature?

• Fixed resistor

• Varistor

• Thermistor

• Superconductor

Which of the following materials is commonly used as a soldering iron stand to hold the iron when not in use?

• Wood

• Plastic

• Metal

• Rubber

Which of the following metals is commonly used in solder alloys?

• Copper

• Aluminium

• Gold

• Tin

Which type of resistor is used to protect circuits from reverse voltage and excessive current?

• Fixed resistor

• Varistor

• Thermistor

• Potentiometer

What is the purpose of the dielectric material inside a capacitor?

• To store electrical energy

• To increase the voltage rating

• To reduce the capacitance

• To separates the capacitor plates and increase capacitance

What is the primary function of a diode in an electrical circuit?

• To amplify signals

• To store electrical energy

• To rectify AC voltage into DC voltage

• To regulate voltage