Objective / Module 1.2 Mobile Device Display: CompTIA A+ Core 1
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Question 1:
Which of the following is NOT a type of liquid crystal display (LCD)?
A) Organic light-emitting diode (OLED)
B) In-plane switching (IPS)
C) Twisted nematic (TN)
D) Vertical alignment (VA)
Explanation: The correct answer is A. OLED is a different
technology than LCD. It uses organic materials that emit light when electrically stimulated.
Question 2:
What is the primary component responsible for displaying images on a mobile device screen?
A) Processor
B) Battery
C) Display
D) Storage
Explanation: The correct answer is C. The display is the
component that visually
presents information to the user.
Question 3:
Which of the following is a type of touchscreen technology commonly found on mobile devices?
A) Resistive
B) Capacitive
C) Inductive
D) All of the above
Explanation: The correct answer is D. Resistive,
capacitive, and inductive are all
common types of touchscreen technology.
Question 4:
What is the purpose of a WiFi antenna connector on a mobile device?
A) To connect to external speakers
B) To connect to a power source
C) To connect to a wireless network
D) To connect to a headset
Explanation: The correct answer is C. The WiFi antenna
connector enables the device
to communicate with wireless networks.
Question 5:
Which component is responsible for converting electrical signals into light for display on an LCD screen?
A) Inverter
B) Touchscreen
C) Camera
D) Microphone
Explanation: The correct answer is A. The inverter
supplies the high voltage needed
to backlight the LCD panel.
Question 6:
Which of the following is NOT a type of liquid crystal display (LCD)?
A) Organic light-emitting diode (OLED)
B) In-plane switching (IPS)
C) Twisted nematic (TN)
D) Vertical alignment (VA)
Explanation: The correct answer is A. OLED is a different
technology than LCD. It
uses organic materials that emit light when electrically stimulated.
Question 7:
What is the primary component responsible for displaying images on a mobile device screen?
A) Processor
B) Battery
C) Display
D) Storage
Explanation: The correct answer is C. The display is the
component that visually
presents information to the user.
Question 8:
Which of the following is a type of touchscreen technology commonly found on mobile devices?
A) Resistive
B) Capacitive
C) Inductive
D) All of the above
Explanation: The correct answer is D. Resistive,
capacitive, and inductive are all
common types of touchscreen technology.
Question 9:
What is the purpose of a WiFi antenna connector on a mobile device?
A) To connect to external speakers
B) To connect to a power source
C) To connect to a wireless network
D) To connect to a headset
Explanation: The correct answer is C. The WiFi antenna
connector enables the device
to communicate with wireless networks.
Question 10:
Which component is responsible for converting electrical signals into light for display on an LCD screen?
A) Inverter
B) Touchscreen
C) Camera
D) Microphone
Explanation: The correct answer is A. The inverter
supplies the high voltage
needed to backlight the LCD panel.
Question 11:
What is the primary difference between IPS and TN LCD panels?
A) Color accuracy
B) Viewing angle
C) Power consumption
D) All of the above
Explanation: The correct answer is D. IPS panels
generally offer better color
accuracy, wider viewing angles, and higher power consumption compared to TN panels.
Question 12:
How does an OLED display differ from an LCD display in terms of light emission?
A) OLED displays emit light from the pixels
themselves, while LCD displays use backlighting.
B) LCD displays emit light from the pixels
themselves, while OLED displays use backlighting.
C) Both use backlighting.
D) Neither uses backlighting.
Explanation: The correct answer is A. OLED technology
allows each pixel to emit
light
independently, leading to deeper blacks and better contrast.
Question 13:
What is the role of the digitizer in a touchscreen device?
A) To convert electrical signals into light
B) To detect and interpret touch input
C) To store data
D) To amplify sound
Explanation: The correct answer is B. The digitizer is
responsible for sensing
touch input and translating it into coordinates that the device's software can understand.
Question 14:
What is the primary difference between IPS and TN LCD panels?
A) Color accuracy
B) Viewing angle
C) Power consumption
D) All of the above
Explanation: The correct answer is D. IPS panels
generally offer better color
accuracy, wider viewing angles, and higher power consumption compared to TN panels.
Question 15:
How does an OLED display differ from an LCD display in terms of light emission?
A) OLED displays emit light from the pixels
themselves, while LCD displays use backlighting.
B) LCD displays emit light from the pixels
themselves, while OLED displays use backlighting.
C) Both use backlighting.
D) Neither uses backlighting.
Explanation: The correct answer is A. OLED technology
allows each pixel to emit
light
independently, leading to deeper blacks and better contrast.
Question 16:
What is the role of the digitizer in a touchscreen device?
A) To convert electrical signals into light
B) To detect and interpret touch input
C) To store data
D) To amplify sound
Explanation: The correct answer is B. The digitizer is
responsible for sensing
touch input and translating it into coordinates that the device's software can understand.
Question 17:
What is the purpose of a VA LCD panel, and how does it differ from IPS and TN panels?
A) VA panels offer the widest viewing angles and
the
best contrast ratio, but they may have slower response times compared to IPS and TN panels.
B) VA panels offer the best color accuracy and
the
fastest response times, but they may have narrower viewing angles compared to IPS and TN panels.
C) VA panels offer the lowest power consumption
and
the best color accuracy, but they may have slower response times compared to IPS and TN panels.
D) VA panels offer the highest brightness and
the
best viewing angles, but they may have narrower viewing angles compared to IPS and TN panels.
Explanation: The correct answer is A. VA panels use a
vertical alignment
technology that provides excellent contrast and wide viewing angles, but can have slower response times compared
to IPS and
TN panels, which can affect motion clarity.
Question 18:
How does the placement of a WiFi antenna on a mobile device affect its performance?
A) Placement has no effect on performance.
B) A top-mounted antenna is generally better for
signal strength.
C) A bottom-mounted antenna is generally better
for
signal strength.
D) A side-mounted antenna is generally better
for
signal strength.
Explanation: The correct answer is B. The position of the
WiFi antenna can impact signal reception. A top-mounted antenna is often preferred as it can provide better signal strength and reduce
interference from other devices.
Question 19:
A) Mini PCIe.
B) M.2.
C) Digitizer.
D) RJ45.
Explanation: The correct answer is B. The 2230 standard
is a kind of M.2 size measuring 22×30 mm. It is common in laptops for use with Wi-Fi and Bluetooth. In
comparison, a PC often uses a 2280 M.2 card. Mini PCIe is an older type of card slot that might be used for Wi-Fi cards, but
it does not use measurements such as 2230 or 2280 the way that M.2 does. A digitizer is not a port at all but a
device that converts tapped impulses into digital information. An RJ45 port is a networking port that allows a
laptop to communicate with the rest of the network in a wired fashion—that is, if the laptop has such a port!
Question 20:
How does the placement of a WiFi antenna on a mobile device affect its performance?
A) Placement has no effect on performance.
B) A top-mounted antenna is generally better for
signal strength.
C) A bottom-mounted antenna is generally better
for
signal strength.
D) A side-mounted antenna is generally better
for
signal strength.
Explanation: The correct answer is B. The position of the WiFi antenna can impact
signal reception. A top-mounted antenna is often preferred as it can provide better signal strength and reduce
interference from other devices.
Question 21:
A client has requested your expert advice on a gaming laptop with a 15-inch display that will cost about $1,400. Which of the following screen technologies would be the BEST choice for this user?
A) OLED
B) VA
C) TN
D) IPS
Explanation: In-plane switching (IPS) is faster than OLED
or VA display technologies (up to 144Hz) and also provides better color than VA displays. It would be a
satisfactory choice for a user who wants a system for both office work and gaming, but it is not the best choice
because you
can find an even better option.
Question 22:
A client is generally satisfied with the thin and light laptops in use by her sales force, except that they need touch screens for more interactive presentations. Which of the following is the BEST recommendation for this client?
A) Replace the display panels with touch-screen
versions.
B) Purchase styluses for use with the existing
laptops.
C) Recommend the client never buy laptops from
that
manufacturer again.
D) Work on a schedule for replacing laptops with
touch-screen versions.
Explanation: The correct answer is D. That leaves us with the option of replacing
the laptops. Unless this is an urgent need, they don’t all need to be replaced at once. The last option, working
on a schedule to replace laptops with touch-screen versions, is the best one. Non-touch models could be repurposed
for use by nonsales personnel, and the replacement touch-screen models can be configured to meet current and
forthcoming
requirements.
Question 23:
What kind of video technology do most laptop LCDs use?
A) TFT active matrix.
B) Passive matrix.
C) OLED.
D) MAC ID.
Explanation:The correct answer is A. TFT active-matrix
displays are the most common in laptops that use LCDs. Passive-matrix screens have been discontinued, but you
might see an older laptop that utilizes this technology. OLED technology is a newer and different technology
that is not based on TFT displays but instead uses emissive display technology, meaning that each dot on the screen is
illuminated by a separate diode. OLED displays can, however, be passive-matrix or active-matrix controlled. The
MAC ID is the hexadecimal address associated with a network adapter, such as a Wi-Fi adapter or network card.
Question 24:
Which of the following uses an organic compound that emits light?
A) TFT active matrix.
B) IPS.
C) OLED.
D) LCD.
E) LED.
Explanation: The correct answer is C. OLED
(organiclight-emitting diode) displays use an organic compound or film that emits light. TFT active matrix
implies LCD, and neither TFT nor LCD uses organic compounds the way OLED does. In-plane switching (IPS) is a
type of LCD technology that increases the available viewing angle compared to older technologies, such as
twisted nematic (TN) matrix LCDs. However, IPS is generally considered inferior to OLED screens when it comes to
brightness and contrast ratio when viewed from an angle. LED screens use a film and diode, but not organically
in the way that OLED does, and not at such a small size.
Question 25:
Which of the following possible reasons a laptop's LCD suddenly went black with no user intervention?
A) Damaged inverter.
B) Damaged LCD.
C) Burned-out CCFL.
D) Incorrect resolution setting.
Explanation: The correct answer is A. A damaged inverter
could cause a laptop’s display to go blank. You can verify whether the LCD is still getting a signal by shining
a flashlight at the screen. A damaged LCD usually works to a certain extent and will either be cracked, have
areas of the Windows interface missing, or show other signs of damage. An incorrect resolution setting can
indeed make the screen suddenly go blank (or look garbled), but that scenario will most likely occur only if the
user has changed the resolution setting—and this question specifies “with no user intervention.”
Question 26:
Which of the following allows you to access a WLAN?
A) LED.
B) Webcam.
C) Digitizer.
D) Stylus.
E) Wi-Fi card.
Explanation: The correct answer is E. A Wi-Fi card, also
known as a Wi-Fi network adapter, allows you to connect to a WLAN (wireless local area network), which is
essentially another name for a Wi-Fi network. LED is a type of display. A webcam is used to communicate visually
and audibly with others or to record oneself. A digitizer is a device that converts tapped or written impulses
on a screen into digital information that the operating system can use. A stylus is a writing device used with a
digitizer or touchscreen.
Report Card
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Wrong Answers: 0
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Mobile Device Display - Objective 1.2 - CompTIA A+ Core 1 (220-1101).
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