Microcontrollers:
1. b) Arduino Uno
2. b) ROM
3. b) It converts analog signals to digital signals.
4. c) C/C++
Circuits:
5. b) It decreases.
6. d) Transistor
7. b) To provide a stable and regulated output voltage.
8. c) They remain unaffected.
Mathematics:
9. c) 1
10. a) 2a
11. c) 25
12. a) 6x + 2
13. a) 24
14. b) 10π units
15. b) 3 hours
16. a) x = 1, x = 2
17. a) 90 km/h
18. d) 49
19. b) 6
20.a) 4 units