A user can operate a keyboard accurately but cannot use a mouse or trackpad at all. Which desktop accessibility feature addresses this directly, and which feature solves the opposite problem?
LPIC-1 Exam 102-500, objective 106. User interfaces and desktops medium
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How these questions are written — where each question comes from, what the verification ledger records, and what happens when one is found wrong.
The options
Correct Mouse Keys moves and clicks the pointer from the numeric keypad; the opposite case, a pointer but no usable keyboard, is served by an on-screen keyboard.
Correct. Mouse Keys maps the numeric keypad to pointer movement and button clicks. An on-screen keyboard is its mirror image: it presents a keyboard that is driven with a pointer, a head tracker or a switch.
Not correct An on-screen keyboard drives the pointer from the keypad; Mouse Keys presents a typing surface for pointer users.
Wrong. The two names have been swapped. An on-screen keyboard is drawn on the display and clicked; Mouse Keys is the keypad-to-pointer mapping.
Not correct Sticky Keys moves the pointer from the keypad; Slow Keys serves users with no keyboard.
Wrong. Both named features are keyboard filters — Sticky Keys latches modifiers, Slow Keys imposes a hold time — and neither touches the pointer or replaces a keyboard.
Not correct A screen reader drives the pointer for keyboard-only users; a screen magnifier serves users without a keyboard.
Wrong. Both of those are visual aids: a screen reader speaks the interface for blind users, a magnifier enlarges part of the screen for users with low vision. Neither substitutes for an input device.
Why
Assistive technologies sort by which channel is impaired. Output aids compensate for vision: screen readers, braille displays, magnifiers, high contrast and large print themes. Input aids compensate for motor control: Mouse Keys for a missing pointer, on-screen keyboards for a missing keyboard, the Sticky/Slow/Bounce/Repeat filters for imprecise keystrokes, gestures and voice recognition for users who can control neither device conventionally. Reading which channel the scenario describes usually settles the item.
Where this comes from
- Cited
- LPI exam objective 106.3
Practise this
Reading one question is not practice. The trainer will draw a short set from objective 106 and space the ones you get wrong.
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