Question 1

In which form the data is stored using shared preferences?
A) XML file inside the internal memory of application.
B) Binary form inside the internal memory of application.
C) A Text file inside internal memory of application.
D) Encrypted form inside the application's internal memory.

Accepted Answer

Shared preferences store data in XML format inside the internal memory of the application. This makes it easy to read and modify the data.

Question 2

Which of the following classes is used to find out the DRM plug-in available in a device?
A) DrmManagerClient
B) DrmServer
C) DrmConstraints
D) DrmRights

Accepted Answer

DrmManagerClient class is used to find out the DRM plug-in available in a device.

Question 3

Which of the following methods can be used to extract licence information from rights object?
A) getDrmRightsObject()
B) getConstraints()
C) getApplicationContext()
D) saveRights()

Accepted Answer

The method getConstraints() is used to extract license information from a rights object, as it retrieves the constraints associated with the DRM rights.

Question 4

What is the result of the query when run on SQLite database?
A) The result is returned in the form of a List
B) The result is returned in the form of a Map
C) A cursor is returned that points to all rows found by query.
D) All are correct

Accepted Answer

In SQLite, the result of the query is returned as a cursor that points to all rows found by the query. This cursor can be used to iterate over the results and extract the data. Options A and B are not correct as SQLite does not return the result in the form of a List or Map. Option D is not correct as only option C is correct.

Question 5

Which of the following is not true about SQLite database?
A) The database files are sandboxed with the application.
B) The application can make database files on external memory.
C) It is small and requires no setup.
D) All are correct

Accepted Answer

All the statements about SQLite are correct.

Question 6

What is the recommended use of BaseColumns._ID in SQLite database?
A) It should always be used to maintain unique ID.
B) It should be used to include unique ID when content provider is being used.
C) It is deprecated now.
D) All are correct.

Accepted Answer

BaseColumns._ID is used in SQLite database to maintain a unique ID for each row. When using a content provider, it is recommended to include BaseColumns._ID in the projection when querying the database. This ensures that each row has a unique ID which is useful for updates and deletes. Option A is incorrect because there may be cases where a database does not require a unique ID. Option C is incorrect because BaseColumns._ID is not deprecated. Option D is incorrect because option A is not always correct.

Question 7

What is the validity of the data stored through shared preferences?
A) Data is deleted when application is closed.
B) Data is deleted when application is paused by pressing home button.
C) Data gets deleted when application is uninstalled.
D) Both "Data is deleted when application is closed" and "Data is deleted when application is paused by pressing home button" are correct.

Accepted Answer

Data stored in shared preferences persists across application restarts and pauses, and is only deleted when the application is uninstalled.

Question 8

What is the validity of the files created on external memory?
A) Files are deleted when user presses "back" button to close the app
B) Files are deleted when user uninstalls the application from device
C) Files are deleted when user presses "Home" button of device
D) Files never get deleted from external memory

Accepted Answer

Files created on external memory are stored on the device's storage which can be accessed by other apps and the user. Therefore, they are not deleted when the user presses the "back" button or the "Home" button. However, they will be deleted if the user uninstalls the application from the device which makes B the best choice.

Question 9

Which of the following is not correct when executing the following line of code? FileOutputStream fOut = openFileOutput("MyFile.txt", MODE_WORLD_READABLE);
A) File "MyFile.txt" is created in internal memory of application.
B) File created by this code is readable by other applications.
C) File "MyFile.txt" is created in external memory.
D) File "MyFile.txt" is created in internal memory.

Accepted Answer

The code uses openFileOutput which creates the file in the internal memory of the application. The mode MODE_WORLD_READABLE makes the file readable by other applications. Therefore, option C is incorrect as it states that the file is created in external memory which is not the case.

Question 10

What are the options that Android offers to store a text file
A) File can be stored on external memory.
B) File can be stored inside the internal memory of application.
C) File can be stored in cache folder that lies in internal memory of application.
D) All are correct

Accepted Answer

All options are correct, but the best choice depends on the specific use case. Storing a file on external memory allows for easy transfer and backup, but may not be accessible if the external memory is removed. Storing a file inside the internal memory of the application provides secure storage that is only accessible by the application, but may consume a lot of space. Storing a file in the cache folder that lies in the internal memory of the application provides fast access to frequently used files, but may be deleted if the system requires more space. Therefore, it is important to consider the specific requirements of the application and choose the storage location accordingly.

Question 11

Which of the following is true when the system is running low on memory?
A) Files in the cache memory of application are deleted.
B) Files that the application made on external memory are deleted.
C) No file gets deleted from the device.
D) Application data saved in SQLite database.

Accepted Answer

When a system is running low on memory, it may clear cache memory to free up space, as cache files are temporary and can be recreated by the application when needed.

Question 12

Which of the following is a database tool included in Android SDK?
A) sqlite3.
B) sqlite.
C) adb.
D) All are correct.

Accepted Answer

The sqlite3 tool is included in the Android SDK and can be used to manage SQLite databases on an Android device or emulator. ADB is a separate tool used for device management and debugging, while sqlite is not a valid tool included in the Android SDK.

Question 13

What is the visibility or accessibility level of the preference file created by application?
A) By default it is private to the application that created it.
B) By default it is available for all applications on the same device.
C) It can be shared with other applications on same device
D) Both "By default it is private to the application that created it" and "It can be shared with other applications on same device" are correct.

Accepted Answer

By default, the preference file created by an application is private to the application that created it, but it can be shared with other applications on the same device by making it accessible to other applications through content providers, intents, or other means of interprocess communication. Therefore, both options A and C are correct, making option D the best choice.

Question 14

What does the following line of code do? FileOutputStream fOut = openFileOutput("MyFile.txt", MODE_WORLD_READABLE); A) The file MyFile.txt will be created in the /data// files/ directory. B) The file MyFile.txt will be created in the /data/data// files/ directory. C) None are correct D) The file MyFile.txt will be created in the /data/data// directory.

Accepted Answer

The openFileOutput() method creates a file output stream to write to a file on the device's internal storage. As per the Android documentation, the file created by this method will be stored in the /data/data/<application-path>/files/ directory. Therefore, option B is correct. Option A is incorrect because /files/ directory is missing. Option D is incorrect because it does not specify the "files" subdirectory. Option C is obviously not correct.

Question 15

Which of the following is to execute complex queries in SQLite database?
A) SQLiteDatabase.query()
B) SQLiteQueryBuilder
C) SQLiteOpenHelper
D) Both "SQLiteDatabase.query()" and "SQLiteQueryBuilder" are correct.

Accepted Answer

The answer of Which of the following is to execute...

Question 16

Which of the following is correct about saving files in cache?
A) Cache file can only be created in internal memory
B) By using getCacheDir()method
C) By using getExternalStorageDirectory()method
D) Both options "By using getCacheDir()method" and "By using getExternalStorageDirectory() method" are correct.

Accepted Answer

The answer of Which of the following is correct about...

Question 17

For the preference class to collect settings from UI, which of the following is required?
A) Preference class should extend Activity class
B) Preference class should extend PreferenceActivity
C) Preference class should extend SharedPreferenceActivity
D) Preference class should extend View class

Accepted Answer

PreferenceActivity is specifically designed to collect settings from UI using the Preference API in Android. Therefore, to collect settings from UI, the preference class should extend PreferenceActivity. Extending Activity or View class will not provide the necessary functionality for collecting settings. SharedPreferenceActivity is not a valid class in Android.

Question 18

Which of the following storage methods does Android offer to ensure secure data saving?
A) Shared preferences
B) Content providers
C) File storage in internal and external memory
D) All are correct

Accepted Answer

Android offers multiple storage methods for secure data saving, and all of the options listed in the question are correct.

- Shared preferences allow the application to store small amounts of data as key-value pairs that are private to the application, preventing other apps from accessing them.
- Content providers provide a secure way for the apps to share data with other apps without giving them direct access to the data.
- File storage in internal and external memory allows the app to store data in a private directory that can only be accessed by the app itself, ensuring the data's privacy and safety.

As all the options are secure storage methods, choosing all of them is the best choice to ensure that the data is protected.

Question 19

Which type of data can be stored using shared preferences?
A) Text files
B) Class objects
C) Primitive data types
D) All are correct

Accepted Answer

Shared preferences are used to store primitive data types such as int, float, boolean, and strings in key-value pairs.

Question 20

Which of the following is true about the cache files made by an application? (Choose two) A) They are visible only to the application that created it. B) They are created at the following path /data/data//cache/ C) They are created at the following path /data//cache/ D) None are correct

Accepted Answer

Cache files made by an application are stored in the cache directory specific to that application, which is located at /data/data//cache/. These files are only visible to the application that created them and cannot be accessed by other applications or users, hence option A is also correct. Option C is incorrect as there is no /data//cache/ directory in Android.

Exam 2: Android Security Essentials

In which form the data is stored using shared preferences?

Which of the following classes is used to find out the DRM plug-in available in a device?

Which of the following methods can be used to extract licence information from rights object?

What is the result of the query when run on SQLite database?

Which of the following is not true about SQLite database?

What is the recommended use of BaseColumns._ID in SQLite database?

What is the validity of the data stored through shared preferences?

What is the validity of the files created on external memory?

Which of the following is not correct when executing the following line of code? FileOutputStream fOut = openFileOutput("MyFile.txt", MODE_WORLD_READABLE) ;

What are the options that Android offers to store a text file

Which of the following is true when the system is running low on memory?

Which of the following is a database tool included in Android SDK?

What is the visibility or accessibility level of the preference file created by application?

What does the following line of code do? FileOutputStream fOut = openFileOutput("MyFile.txt", MODE_WORLD_READABLE) ;

Which of the following is to execute complex queries in SQLite database?

Which of the following is correct about saving files in cache?

For the preference class to collect settings from UI, which of the following is required?

Which of the following storage methods does Android offer to ensure secure data saving?

Which type of data can be stored using shared preferences?

Which of the following is true about the cache files made by an application? (Choose two)