Mobile application Questions & Answers

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Questions
101 Android Applications must be signed.
A After they are installed
B Before they are installed
C Never
D Within two weeks of installation

Answer: Before they are installed
102 Which of the following are not a component of an APK file?
A Resources
B All of these are components of the APK
C Native Librariesr
D Dalvik executable

Answer: All of these are components of the APK
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103 What is contained within the manifest xml file?
A The permissions the app requires
B The list of strings used in the app
C The source code
D All other choices

Answer: The permissions the app requires
104 The emulated device for android.
A Runs the same code base as the actual device, all the way down to the machine layer.
B Is more of a simulator, and acts as a virtual machine for the Android device.
C Runs the same code base as the actual device, however at a higher level.
D An imaginary machine built on the hopes and dreams of baby elephants.

Answer: Runs the same code base as the actual device, all the way down to the machine layer.
105 The Emulator is identical to running a real phone EXCEPT when emulating/simulating what?
A Telephony
B Applications
C Sensors
D The emulator can emulate/simulate all aspects of a smart

Answer: Sensors
106 How is a simulator different from an emulator?
A Emulators are only used to play old SNES games, simulators are used for software development
B The emulator is shipped with the Android SDK and third party simulators are not
C The emulator can virtualize sensors and other hardware features, while the simulator cannot
D The emulator imitates the machine executing the binary code, rather than simulating the behavior of the code at a higher level.

Answer: The emulator imitates the machine executing the binary code, rather than simulating the behavior of the code at a higher level.
107 An activity can be thought of as corresponding to what?
A A Java project
B A Java class
C A method call
D An object field

Answer: A Java class
108 To create an emulator, you need an AVD. What does it stand for?
A Android Virtual Display
B Android Virtual Device
C Active Virtual Device
D Application Virtual Display

Answer: Android Virtual Device
109 The ___________ file specifies the layout of your screen.
A Layout file
B Manifest file
C Strings XML
D R file

Answer: .Layout file
110 While developing Android applications, developers can test their apps on…
A Emulator included in Android SDK
B Physical Android phone
C Third-party Emulators (Youwave, etc.)
D All three options will work.

Answer: All three options will work.
111 What file is responsible for glueing everthing together , explaining what the applicatin consists of, what its main building blocks are, ext…?
A Layout file
B Strings XML
C R file
D Manifest file

Answer: Manifest file
112 The XML file that contains all the text that your application uses.
A stack.xml
B text.xml
C strings.xml
D string.java

Answer: strings.xml
113 Which of the following is the most “resource hungry” part of dealing with Activities on Android
A Closing an app
B Suspending an app
C Opening a new app
D Restoring the most recent app

Answer:Opening a new app
114 What runs in the background and doesn’t have any UI components?
A Intents
B Content Providers
C Services
D Applications

Answer: Services
115 What is an Activity?
A A single screen the user sees on the device at one time
B A message sent among the major building blocks
C A component that runs in the background without any interface.
D Context referring to the application environment.

Answer:. A single screen the user sees on the device at one time
116 When an activity doesn’t exist in memory it is in.
A Starting state
B Running state
C Loading state
D Inexistent state.

Answer: Starting state
117 Which of the following is NOT a state in the lifecycle of a service?
A Starting
B Running
C Destroyed
D Paused

Answer: Paused
118 Intents
A are messages that are sent among major building blocks
B trigger activities to being, services to start or stop, or broadcast
C are asynchronous
D all of these

Answer: all of these
119 Broadcast receivers are Android’s implementation of a system-wide publish/subscribe mechanism, or more precisely, what design pattern?
A Observer
B Facade
C Mediator
D Command

Answer: Observer
120 What built-in database is Android shipped with?
A SQLite
B Apache
C MySQL
D Oracle

Answer:SQLite

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