Learn: Android & Kotlin Modules 1-5 Exam Questions

Which class contains resource IDs for resources in the res/ directory? A. R B. res C. xml D. ID

A. R

Given MyApp, which reference accesses it in XML? A. @string/myapp B. @+id/myapp C. R.id.myapp D. R.string.myapp

A. @string/myapp

Which function creates an array in Kotlin? A. new array() B. [] C. arrayOf() D. array()

C. arrayOf()

What does println(5 > 3 && 5 < 10) print? A. undefined B. false C. true D. null

C. true

How do you create an instance of MyClass named myObj in Kotlin? A. myObj = new MyClass() B. MyClass.new myObj C. val myObj = MyClass() D. myObj : MyClass()

C. val myObj = MyClass()

In fun myFunction(fname: String), what is fname? A. parameter B. override C. range D. inherit

A. parameter

Kotlin statements must end with a semicolon. A. True B. False

B. False

Which starts a single-line comment in Kotlin? A. % B. // C. # D. --

B. //

Which prints Hello Gwapo in Kotlin? A. cout<

D. println("Hello Gwapo")

Can a Kotlin class inherit properties and functions from another class if inheritance is enabled? A. True B. False

A. True

What is Android? A. A Linux-based mobile OS B. A word processor C. A database D. A hardware processor

A. A Linux-based mobile OS

Who originally developed Android before Google acquired it? A. JetBrains B. Android Inc. C. Apple D. Oracle

B. Android Inc.

When did Google acquire Android Inc.? A. 2005 B. 2008 C. 2011 D. 2016

A. 2005

Which phone carried the first commercial Android release? A. Nexus S B. HTC Dream C. Pixel 1 D. Galaxy S

B. HTC Dream

Which early Android versions had no dessert codenames? A. 1.0 and 1.1 B. 1.5 and 1.6 C. 2.0 and 2.1 D. 4.0 and 4.1

A. 1.0 and 1.1

Which version first received an official dessert codename? A. 1.0 B. 1.1 C. 1.5 Cupcake D. 1.6 Donut

C. 1.5 Cupcake

Which version brought support for larger screen sizes in the slides? A. Donut B. Froyo C. Pie D. Oreo

A. Donut

Which version introduced live wallpaper in the slides? A. Eclair B. Honeycomb C. Lollipop D. Android 11

A. Eclair

Which version is associated with Wi-Fi hotspot support? A. Froyo B. Cupcake C. Pie D. Android 14

A. Froyo

Which release is associated with the Nexus S and improved copy and paste? A. Gingerbread B. Donut C. Oreo D. Android 13

A. Gingerbread

Which Android version family focused on tablets and a revised 3D UI? A. Honeycomb B. Eclair C. Marshmallow D. Android 10

A. Honeycomb

Face Unlock and Wi-Fi Direct are associated in the slides with which version? A. Ice Cream Sandwich B. Froyo C. Donut D. Android 11

A. Ice Cream Sandwich

Which version family introduced Google Now in the slides? A. Jelly Bean B. Cupcake C. Nougat D. Oreo

A. Jelly Bean

Which release is associated with the voice trigger OK Google? A. KitKat B. Eclair C. Gingerbread D. Android 12

A. KitKat

Material Design and ART runtime support are associated with which release? A. Lollipop B. Honeycomb C. Pie D. Android 10

A. Lollipop

Which release introduced the runtime permission model and fingerprint authentication in the slides? A. Marshmallow B. Cupcake C. Froyo D. Android 16

A. Marshmallow

Split-screen and Data Saver are associated with which version? A. Nougat B. Oreo C. Pie D. Android 12

A. Nougat

Picture-in-picture and adaptive icons are associated with which release? A. Oreo B. Eclair C. Jelly Bean D. Android 10

A. Oreo

Adaptive Battery and Adaptive Brightness are associated with which version? A. Pie B. KitKat C. Froyo D. Android 11

A. Pie

Which release introduced a system-wide dark theme in the slides? A. Android 10 B. Android 8 C. Android 6 D. Android 4

A. Android 10

Native screen recording and automatic permission revocation appear under which release? A. Android 11 B. Android 9 C. Android 7 D. Android 5

A. Android 11

Scrolling screenshots and one-handed mode appear under which release? A. Android 12 B. Android 10 C. Android 8 D. Android 6

A. Android 12

Expanded Material You themes and a QR scanner appear under which release? A. Android 13 B. Android 11 C. Android 9 D. Android 7

A. Android 13

Predictive back gestures and notification flashes appear under which release? A. Android 14 B. Android 12 C. Android 10 D. Android 8

A. Android 14

Partial screen sharing and sensitive notifications appear under which release? A. Android 15 B. Android 13 C. Android 11 D. Android 9

A. Android 15

What internal codename does the slide give Android 16? A. Baklava B. Tiramisu C. Snow Cone D. Upside Down Cake

A. Baklava

Which architecture layer forms the foundation of Android? A. Linux kernel B. Applications C. UI layout D. Manifest

A. Linux kernel

Which layer exposes system services to app developers? A. Application framework B. Linux kernel C. App icon D. XML values

A. Application framework

Which layer contains C/C++ platform functionality in the module stack? A. Platform libraries B. Applications C. Activities D. Menus

A. Platform libraries

Where are installed user-facing apps placed in the architecture stack? A. Applications layer B. Linux kernel C. Raw resources D. Runtime only

A. Applications layer

What are the five architecture layers shown, from top to bottom?

Applications → Android Framework → Android Runtime → Platform Libraries → Linux Kernel

What is the role of Android Runtime in the architecture? A. Execute app code B. Define icon colors only C. Store only photos D. Replace the Linux kernel

A. Execute app code

Which tools are listed as prerequisites in Module 2? A. JDK and Android Studio B. Excel and Git C. Only a web browser D. Python and Docker

A. JDK and Android Studio

Where do you start a project when another project is open? A. File > New > New Project B. Run > Restart C. Help > About D. View > Tool Windows

A. File > New > New Project

Which project template does the module choose? A. Empty Activity B. No Activity C. Wear OS D. Basic Service

A. Empty Activity

Which value identifies an app project by namespace in the configuration example? A. Package name B. Screen brightness C. Status bar D. Emulator size

A. Package name

What example app name appears in the project setup slides? A. My First App B. Hello Device C. My Browser D. Kotlin Studio

A. My First App

Which language choices are shown during project setup? A. Java and Kotlin B. C and PHP C. Swift and Ruby D. SQL and HTML

A. Java and Kotlin

Which Android Studio area is where you edit source files? A. Editor window B. Status bar C. Toolbar D. Device bezel

A. Editor window

Which area offers Run and Android tool actions? A. Toolbar B. Status bar C. Editor gutter D. Layout file

A. Toolbar

Which area gives a compact way to move through project files? A. Navigation bar B. Status bar C. Emulator D. Manifest

A. Navigation bar

Which interface element expands or collapses IDE tool windows? A. Tool window bar B. Keyboard layout C. App icon D. SDK level

A. Tool window bar

Where do project warnings and IDE status appear? A. Status bar B. Strings XML C. Manifest D. Device screen

A. Status bar

What can tool windows provide access to? A. Project management, search, and version control B. Only app colors C. Only device wallpaper D. Only Kotlin comments

A. Project management, search, and version control

Which two ways to run an Android app are covered? A. Physical device or emulator B. Browser or printer C. Spreadsheet or PDF D. Server or shell only

A. Physical device or emulator

Before running on a connected phone, what must be enabled? A. USB debugging via Developer options B. Airplane mode C. Screen recording D. Battery saver

A. USB debugging via Developer options

Where do you create an emulator device in the module? A. Device Manager B. Layout Editor C. Strings XML D. Manifest editor

A. Device Manager

When creating an emulator, which choices does the module identify? A. Device type/screen and Android SDK version B. Only the app icon C. Only the package name D. Only the JDK vendor

A. Device type/screen and Android SDK version

Who created Kotlin according to Module 3? A. JetBrains B. Apple C. Microsoft D. Android Inc.

A. JetBrains

Which is a listed use of Kotlin? A. Android and server-side applications B. Only image files C. Only hardware design D. Only PDF layout

A. Android and server-side applications

Why can Kotlin be used in an existing Java project? A. Java interoperability B. It deletes Java C. It requires a different OS D. It is a markup language

A. Java interoperability

Which function is the entry point of a simple Kotlin program? A. main() B. println() C. init() D. when()

A. main()

Which keyword declares a function? A. fun B. func C. def D. method

A. fun

Which keyword declares a read-only variable reference? A. val B. var C. let D. constvar

A. val

Which keyword allows reassignment of a variable? A. var B. val C. fun D. class

A. var

What is type inference? A. Inferring a variable type from its assigned value B. Making every value a string C. Removing all types D. Creating a class automatically

A. Inferring a variable type from its assigned value

Which syntax makes a block comment? A. /* comment */ B. // comment // C. # comment D.

A. /* comment */

What does println("Hi") do? A. Print Hi followed by a newline B. Read keyboard input C. Declare a function D. Create a file

A. Print Hi followed by a newline

What does && mean in a Boolean condition? A. Both conditions must be true B. At least one is true C. Reverse the result D. Assign a value

A. Both conditions must be true

What does || mean in a Boolean condition?

A. At least one condition is true

What does !true evaluate to? A. false B. true C. null D. 1

A. false

What is the output of println(4 4)? A. true B. false C. 4 D. null

A. true

What does an if/else expression select? A. A result based on a condition B. A superclass C. A resource folder D. An SDK version

A. A result based on a condition

Which Kotlin construct selects among several branches? A. when B. import C. init D. override

A. when

Which loop tests its condition before executing its body? A. while B. do-while C. init D. class

A. while

Which loop runs its body at least once? A. do-while B. while C. for over empty array D. none

A. do-while

What does for (i in 1..3) iterate over? A. 1, 2, 3 B. 1, 2 C. 0, 1, 2 D. 3 only

A. 1, 2, 3

How do you loop through an array called items? A. for (item in items) B. foreach item of items C. for item(items) D. loop items:

A. for (item in items)

What is a class in OOP? A. A blueprint for objects B. A PDF page C. A resource ID D. An emulator

A. A blueprint for objects

Which keyword declares a Kotlin class? A. class B. objectnew C. structclass D. typeclass

A. class

What is an object? A. An instance of a class B. An IDE status message C. A compiler version D. A package name

A. An instance of a class

Which Kotlin declaration has a primary constructor property? A. class Person(val name: String) B. new Person(name) C. class Person -> name D. Person.class(name)

A. class Person(val name: String)

When does an init block execute? A. During object initialization B. Only when a loop ends C. When the app is uninstalled D. Only after onDestroy

A. During object initialization

What does a default constructor argument allow? A. Omitting that argument when creating an object B. Disabling the class C. Changing val to var D. Skipping compilation

A. Omitting that argument when creating an object

Which keyword introduces a secondary constructor? A. constructor B. secondary C. create D. new

A. constructor

How does Kotlin mark a class inheritable by default? A. open class Base B. final class Base C. private class Base D. static class Base

A. open class Base

Which keyword marks a subclass method that replaces an open parent method? A. override B. replace C. extend D. superfun

A. override

What is Kotlin null safety intended to reduce? A. Unexpected null dereferences B. Emulator startup time C. Resource size D. Package length

A. Unexpected null dereferences

Which type can hold null? A. String? B. String C. Int only D. val

A. String?

Which operator accesses a nullable value only when it is non-null? A. ?. B. !! C. :: D. ..

A. ?.

What does the Elvis operator ?: usually provide? A. A fallback when the left side is null B. A new class C. An XML namespace D. A loop label

A. A fallback when the left side is null

What is a Kotlin extension function?

A function callable on a type without changing its class definition

What does $name do inside a Kotlin string template? A. Insert the value of name B. Create a variable named name C. Start a comment D. Access an XML resource

A. Insert the value of name

What are the two Java-to-Kotlin conversion workflows described?

Convert an entire Java file, or add a Kotlin file and paste Java code for conversion

Which command converts a whole Java file in the module? A. Convert Java File to Kotlin File B. Create Device C. Rebuild Project D. Extract Resource

A. Convert Java File to Kotlin File

Which extension does a converted Kotlin source file use? A. .kt B. .java C. .xml D. .kotlinapp

A. .kt

Can Java and Kotlin files coexist in an Android Studio project? A. Yes B. No

A. Yes

What project configuration files can change when Kotlin support is configured in the module? A. build.gradle files B. drawable PNG files C. device logs D. font files

A. build.gradle files

Which file declares Android application components? A. AndroidManifest.xml B. colors.xml C. activity_main.xml D. arrays.xml

A. AndroidManifest.xml

What are the four primary Android app components?

Activities, services, broadcast receivers, and content providers