(21) In a modern smartphone, which component is an essential part for displaying images and text on the screen?
- (a) SIM card
- (b) Display (LCD or OLED)
- (c) Battery
- (d) Charger
(22) In a musical instrument like a violin, which component is an essential part for creating sound when the strings are played?
- (a) Bow
- (b) Fingerboard
- (c) Resonating body (soundbox)
- (d) Chin rest
(23) In a microwave oven, which component is an essential part for generating electromagnetic waves to heat food?
- (a) Glass turntable
- (b) Magnetron
- (c) Control panel
- (d) Interior light
(24) In a car’s electrical system, which component is an essential part for storing electrical energy and starting the engine?
- (a) Alternator
- (b) Battery
- (c) Spark plug
- (d) Radiator
(25) In a television remote control, which component is an essential part for transmitting signals to the TV to change channels and adjust volume?
- (a) Rubber buttons
- (b) Infrared (IR) emitter
- (c) Battery compartment
- (d) LCD screen
