on input/output devices.

Front

Resistive touchscreens detect input using:

Back

Pressure on layers

Answer explanation

Technical Basis: Two ITO films form a closed circuit when pressed, using voltage gradient measurement for positioning

Exclusion Rationale:

×A - Capacitive screen principle

×C - Acoustic wave screens

×D - Infrared screens

Front

Can capacitive touchscreens be used with gloves?

Back

False

Answer explanation

Core Mechanism: Relies on human body capacitance coupling (typically 50-100pF)

Key Data: Regular gloves (insulation resistance >10MΩ) block coupling

Exception: Conductive fiber gloves (<1kΩ resistance) work

Front

Which touchscreen type is more durable for outdoor kiosks?

Back

Resistive

Answer explanation

Comparative Parameters:

Feature Resistive Capacitive

Surface Flexible PET Tempered Glass

Protection IP65 IP54

Temperature -20~70℃ 0~50℃

Front

A DSLR camera’s mirror reflects light to the: a) Electronic viewfinder b) Optical viewfinder c) LCD screen

Back

Optical viewfinder

Answer explanation

Light Path: Lens → Mirror → Pentaprism → Eyepiece

Note: Electronic viewfinders (EVF) are mirrorless camera features

Front

Do mirrorless cameras use a pentaprism to direct light?

Back

False

Answer explanation

Key Innovation: Eliminates mirror box (reduces thickness by 15-20mm)

Alternative: Direct sensor readout for electronic viewing

Front

Smartphone cameras typically use:

Back

CMOS sensors

Answer explanation

Tech Evolution:

Post-2010 CMOS achieved Backside Illumination (BSI) breakthroughs

Read noise improved from 50e⁻ to <1e⁻

Front

The "f-number" (e.g., f/2.8) controls:

Back

Aperture size

Answer explanation

Formula: Effective aperture diameter = Focal length ÷ f-number

Example: 50mm lens at f/2 has 25mm aperture

Front

A pixel is:

Back

A physical dot of light

Answer explanation

LCD Pixel Structure:

Each pixel contains RGB color filters

Typical size 50-300μm

Front

Higher PPI (Pixels Per Inch) always means better image quality.

Back

False

Answer explanation

Human Eye Limit Formula: PPI > 3438/Viewing distance (cm)

TV Example: 55" 4K TV has ~80 PPI but appears sharp at 3m

Front

4K resolution is approximately:

Back

3840x2160

Answer explanation

Historical Development:

1080p (1920×1080) → QHD (2560×1440) → UHD (3840×2160)