$13.$ Given an array int $\backslash (\backslash$operatorname$\{$arr$\}[3]=\backslash \{10,20,30\backslash \}\backslash )$; what value does $\backslash (\backslash$operatorname$\{$arr$\}[1]\backslash )$ hold?

$-$ A$)10$

$-$ B$)20$

$-$ C$)30$

$-$ D$)0$

$14.$ Which function is used to include an external library in an Arduino sketch?

$-$ A$)\backslash$#include

$-$ B$)$ import

$-$ C$)$ load

$-$ D$)$ use

$15.$ What is the purpose of the Servo library in Arduino?

$-$ A$)$ To read sensor data

$-$ B$)$ To control servo motors

$-$ C$)$ To manage digital input$/$output pins

$-$ D$)$ To handle interrupts

$16.$ Which command will install a new library using the Arduino IDE?

$-$ A$)$ Tools $>$ Add Library

$-$ B$)$ Sketch $\backslash (>\backslash )$ Include Library $\backslash (>\backslash )$ Manage Libraries

$-$ C$)$ File $\backslash (>\backslash )$ Import Library

$-$ D$)$ Edit $\backslash (>\backslash )$ Add Library

$17.$ Which function is used to attach an interrupt to a digital pin in Arduino?

$-$ A$)$ attachInterrupt $($pin$,$ function, mode$)$

$-$ B$)$ interrupt $($pin$,$ function, mode$)$

$-$ C$)$ enableInterrupt $($pin$,$ function$)$

$-$ D$)$ pinInterrupt $($pin$,$ function, mode$)$

$18.$ Which of the following is a valid interrupt mode in Arduino?

$-$ A$)$ Low

$-$ B$)$ HIGH

$-$ C$)$ change

$-$ D$)$ UP