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Learn Electronics

Basics of Electronics

Instructions

  • Total number of questions : 20.
  • Time alloted : 30 minutes.
  • Each question carry 1 mark, no negative marks.
  • DO NOT refresh the page.
  • All the best.


1.     What is the most commonly used conductors in electronics?
Aluminum
Copper
Gold
Silver
2.     The conduction band is closest to the valence band in?
Semiconductors
Conductors
Insulators
The distance is the same for all of the above
3.     What can a semiconductor sense?
Magnetism
Temperature
Pressure
All of the above
4.     Which semiconductor material is made from coal ash?
Germanium
Silicon
Tin
Carbon
5.     Good insulators are?
Have few electrons in their outer shells
Have a large dielectric strength
Have a small breakdown voltage
Have many electrons in the nucleus
6.     Silicon atoms combine into an orderly pattern called a?
Covalent bond
Crystal
Semiconductor
Valence orbit
7.     If conductance increases as temperature increases, this is known as a?
Positive coefficient
Negative current flow
Negative coefficient
Positive resistance
8.     Which among the following is the best conductor of electricity?
Silver
Copper
Gold
Lead
9.     Which resistive component is designed to be temperature sensitive?
Thermistor
Rheostat
Potentiometer
Photoconductive cell
10.     If the current in a circuit equals 0 A, it is likely that the?
Voltage is too high
Resistance is too low
Circuit has a short
Circuit is open
11.    An example of potential energy is?
Bulb
A moving vehicle
The sun
A battery
12.     What is the color coding for a value 220 ohms 5% resister ?
Red, Red, Brown, Gold
Orange, Orange, Black, Gold
Red, Red, Black, Gold
Red, Red, Brown, Silver
13.    Gold is used for connectors due to?
Gold does corrode
Better conductor
Gold does not corrode
14.    A damaged Resistor?
May appear burned
May have an increased resistance value
May be checked with an ohmmeter
All of the above
15.    A battery's capacity to deliver power is measured in?
kwh
Ah
Wh
Vh
16.    Why is heat produced in a diode?
Due to current passing through the diode
Due to voltage across the diode
Due to the power rating of the diode
Due to the PN junction of the diode
17.    Increasing the number of turns of wire on the secondary of a transformer will?
Increase the secondary current
Decrease the secondary current
Have no effect on the secondary current
Increase the primary current
18.    In a power supply diagram, which block indicates a smooth dc output?
Transformer
Filter
Rectifier
Regulator
19.    Energy is defined as the ability to?
Produce heat
Produce light
Produce sound
All of the above
20.    Which element exhibits the property of inertia?
Resistance
Capacitance
Inductance
Both resistance and inductance