(26) In a typical household water faucet, which component is an essential part for controlling the flow of water?
- (a) Sink
- (b) Valve
- (c) Drainpipe
- (d) Faucet handle
(27) In a digital watch, which component is an essential part for keeping track of time and displaying it on the screen?
- (a) Bezel
- (b) Watchband
- (c) Quartz crystal
- (d) Second hand
(28) In a camera lens, which component is an essential part for adjusting the focal length and focusing on objects at different distances?
- (a) Lens cap
- (b) Zoom button
- (c) Aperture
- (d) Tripod mount
(29) In an electric guitar, which component is an essential part for producing sound when the strings are strummed or plucked?
- (a) Tuning pegs
- (b) Whammy bar
- (c) Pickup
- (d) Neck
(30) In a bicycle, which component is an essential part for stopping the bike by applying friction to the wheel rims?
- (a) Chain
- (b) Saddle
- (c) Brake pads
- (d) Handlebars
