General IOS Technical Test MCQs

1. When you create a new iOS project from a template, the template automatically makes a controller object for you.

2. When adding objects to NSMutableDictionary, the key...

3. Which code snippets would work for changing the position of a view?

4. What data type do you initialize if you want a list of items that can change?

5. What data object can store a timestamp the best?

6. Difference between a frame and bounds?

7. What file contains configuration data for the app?

8. How do you reference your app bundle?

9. What function is called for each cell in a Table View?

10. Which keyboard shortcuts will run your app on the simulator?

11. What's the difference between NSArray and NSMutableArray?

12. What is @2x used for?

13. Which symbol do you prefix a character string with when you want a hard coded string?

14. ARC Stands for:

15. The archive that holds the saved create and configure view objects is known as:

16. What data type do you initialize if you want a string that can change?

17. A Collection View is another name for a tableView

18. The main thread handles touch inputs

19. If an asset is for iPad only, how do you specify it in the file name?

20. An indexPath has a Section and a ____

21. What is the function in Objective C that determines what is in the cells of a tableView?

22. In manual memory management, what do you do when you don't need a reference on a object ?

23. Which object is visible to the user?

24. viewDidLoad comes after viewDidAppear?

25. When using ARC, how do you destroy an object in Objective C?

26. Is it possible to make a full application without using Interface Builder?

27. If you use threading, on which thread should UI Transitions be called?

28. What structure can hold an x and y coordinate that defines a location?

29. Difference between Cocoa and Cocoa Touch?

30. What function do you call to close the current view and go back to the root?

31. What is a category?

32. In ARC enabled project: [someObject release];

33. +(void)doSomething{}

34. What can be linked to an Obj-C program without any particular process?

35. Difference between NSInteger and int?

36. Which holdsdata and knows nothing about the user interface?

37. When do you use the 'assign' value for a property?

38. What do you use to expose preferences for your app in the Settings section of the device?

39. In order to test your application in XCode, which testing frameworks are available?

40. What structure can be used to define a portion of a series?

41. What class supports the sharing of small amounts of data such as strings or dates to iCloud?

42. How can you make the following code display with rounded corners? UIView *rectView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)]; rectView.backgroundColor = [UIColor redColor]; rectView.layer.cornerRadius = 8; [self.view addSubview:rectView];

43. Which statement is TRUE of the use of categories?

44. Best describes the differences between iOS 7 and iOS 6?

45. NSXMLParser is which kind of parser ?

46. An object with at least one owner can be destroyed.

47. This code doesn't do much, but which line will call the + (void)initialize method on the class SomeClass 1. - (void)doSomething 2. { 3. [SomeClass someClassMethod]; 4. SomeClass *obj = [[SomeClass alloc] init]; 5. NSString *descriptionString = [obj getNewString]; 6. }

48. The app is in the background but not executing code. What State App is it in?

49. Which is true?

50. What is the effect of using 'weak' in the following @property definition: @property (nonatomic, weak) SomeClass *responder; ?

51. Which scenario will not result in NSOperation throwing an exceptions:

52. In Objective C, all instance methods are accessors.

53. What class can implement Document Objects?

54. Which method is used to deallocate all the noncritical custom data structure associated with your view controller?

55. How can an application respond to they keyboard being dismissed by the user

56. Which one is true?

57. If you have a CGPathRef and need to draw this path to a core animation layer, which object would you use.

58. When you download a file and the application go to background. You can ...

59. When you play a video with AV Foundation and aAVPlayer. If you want to mute the video

60. Which Interface Builder object will help you to create an animation with a given number of images?

61. Which is the correct declaration of property of a 'Date Picker' user interface object?

62. The files InfoPlist.strings and main.m are always found in ___________, by default.

63. Which can help you to add a new framework to your iOS app in Xcode 4.x?

64. Suppose you are creating an ad hoc provisioning profile in Xcode 4.x. Which of the following will you seek from your testers/testing team to add to the iOS Provisioning Portal?

65. Which attribute in Xcode 4.x, enables you to display 'Comment' as a text inside a text field, as given in the image?

66. Which is the correct declaration of an input text field with the title, 'input2'?

67. What is the use of 'Disabled' attribute of a Text Field object?

68. Which setting is optional while submitting an app to the Apple App Store?

69. What is the use of creating outlets for objects in iOS applications?

70. Which is not a state of an iOS app?

71. The given image is a snapshot of an iOS app. What does it depicts?

72. The minimum resolution required for app icons on iOS or iPod touch with non-retina display is:

73. Which profile is automatically created and installed on the iOS device when you add an iOS device in Xcode 4.x for the first time?

74. Which is not an inbuilt received action in a Web View Interface Builder object?

75. Which framework must be added in an Xcode 4.x project to play audio files?

76. As an iOS app tester, which is the advantages of having an ad hoc provisioning profile?

77. Which option is a property of UIActivityIndicatorView object in Xcode 4.x?

78. Which profile is to be created to test an iOS app on a variety of devices and iOS versions?

79. You are developing an application for iOS in Xcode 4.x. Which option will check if a text field with id 'TextField' is empty or not, and displaying it in a label with the id 'Output'?

80. Which two are true about (void)didReceiveMemoryWarning method?

81. The configuration data of table view objects in Xcode 4.x is loaded from:

82. What is the use of Alpha value that is available in attributes of every Interface Builder object?

83. How can you create an OpenGL ES texture with a .png image?

84. Can non-main threads poll for events?

85. Which is a feature of CAPropertyAnimation class in Core Animation?

86. What is the default value for the anchorPoint property in Layer Geometry?

87. Can you place calls using the iPhone SDK?

88. What is the CompressResources build step in an iPhone Xcode project?

89. Does ABPersonCreate function add the newly created record into the address book?

90. What is the endianness of the network for IP communications?

91. Which can be used to draw a tiled image?

92. Can the iPhone use Bonjour messaging?

93. Can you use POSIX threads on the iPhone?

94. While using an iPhone, a user switches from one application to another application or service on the device. What is the most important factor to be kept in mind to ensure that your application reflects the most recent changes made by the user the next time it starts?

95. How do you play a short sound on the iPhone?

96. Which is not a touch event method?

97. Is OpenAL available on the iPhone?

98. Consider the following code: (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Set Background Color/Pattern self.window.backgroundColor = [UIColor blackColor]; self.tabBarController.tabBar.backgroundColor = [UIColor clearColor]; //self.window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@'testbg.png']]; // Set StatusBar Color [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent]; // Add the tab bar controller's current view as a subview of the window self.window.rootViewController = self.tabBarController; [self.window makeKeyAndVisible]; return YES; } How can the error be corrected that gets thrown in the console, 'Applications are expected to have a root view controller at the end of application launch'?

99. Which allows it to determine if an application is running on iPhone, or if it's running on an iPod Touch?

100. What is true about ARC and manual memory management?

101. What does the 'strong' property attribute do?

102. What gets returned if XIB is not properly connected to a parent controller?

103. What is the use of performSelector in iOS?

104. Correct way to get the value of the first object of a NsMutableArray stored in another NsMutableArray?

105. What is the maximum size of an iOS application?

106. Correct way to set the font size of UIButton title label?

107. Which framework is needed to apply a border to an object?

108. How can it be detected if the app is running on an iPhone 5?

109. Which is not a valid Touch method with respect to Cocoa Touch programming?

110. Which will return the device's current location?

111. Correct way to print out stack/trace to the console/log in Cocoa application?

112. Which is not a valid UIGestureRecognizer?

113. Which will change the placeholder text color in UITextField?

114. Which framework is needed to round corners of UILabel?

115. Which is not a valid icon size for any iOS device (iPhone, iPod, iPad)?

116. Select all incorrect bundle ID(s):

117. Which will set the font of UISegmentedControl?

118. Which correctly sets an image on UIButton?

119. Which font packages are supported by Cocoa-Touch?

120. Which is not an Open Source Framework/Library?

121. Which is the best way to add a UIToolbar above keyboard?

122. Select which is not UITableViewCellSelectionStyle values?

123. What is the correct method to define a delegate object in an ARC Environment?

124. Which is the best practice to find active internet connection?

125. Output of following code? NSLog(@'%.2f',[[UIDevice currentDevice].systemVersion floatValue]);

126. Difference between new and [[alloc]init] in iOS?

127. How can the application name of an iOS project be changed?

128. What could be the probable result if selector is unknown or undefined?

129. Is it possible to deploy beta build on any device?

130. Which one is true regarding integrating and using custom fonts in an iOS application?

131. Which is the correct way to set UIButton's Highlight Tint color programmatically?

132. Which properties would be used to draw a shadow under UIView?

133. Which is the correct way to check whether the view controller view is loaded or visible?

134. Which is the correct way to transfer data from one view controller to another?

135. Which UILabel properties help adjust text within a UILabel?

136. Which is the correct way to set the Navigation Bar Color of the Tab Bar Configure Menu?

137. What does EXC_BAD_ACCESS signal received mean in Xcode?

138. Which is best JSON library to be used in iOS applications

139. How can an SMS be sent programmatically from the iPhone (iOS 4.0 or later)?

140. Difference between assign and retain in Objective-C?

141. Which property would be used to get the UDID of UIDevice on iOS?

142. When does this behavior usually happen? 'Xcode Message: finished running ' on targeted device shows, but nothing happens

143. Is it possible to set multiple architecture from Build Settings tab in Xcode for a project?

144. Which framework can be used to call SOAP web services in iOS applications?

145. What property in info.plist handles the association of file types in an iPhone application?

146. Which method of Objective-C handles detecting the shake gesture on an iOS device?

147. Which one is the best resolution for the following error? 'A valid signing identity matching this profile could not be found in your keychain'

148. Best way to show multiple lines text in the UILabel?

149. Which correctly describes when the - (void)viewDidUnload method is called?

150. Which is not a valid MKAnnotationView property?

151. What does a '__block' type specifier mean?

152. Which is not a valid MPVolumeView method?

153. Which code samples will declare a variable inside a block in Objective-C?

154. What is true about Grand Central Dispatch(GCD) and NSOperation?

155. Which will print the value of a Boolean flag in NSLog?

156. Which is not used to find an object contained in NSMutableArray?

157. Why does the error, 'EXC_BAD_ACCESS' occur?

158. Which changes the color of the pagination dots of UIPageControl?

159. Which will make an iPhone app return its own version number?

160. Where does Xcode place its build products and other intermediaries/temporary files?

161. Which is the correct way to get the screen height and width in iOS ?

162. Which CATransform3D matrix cell is responsible for perspective transforms?

163. Which method is used to dismiss keyboard for UITextField?

164. Select the following statements that are true?

165. The iPhone Simulator can be found at:

166. Which is the correct way to vertically center the UITextField text?

167. What will happen when the tableView:accessoryButtonTappedForRowWithIndexPath UITableViewDelegate method is called, in a case where there is a custom UIControl subclass in the standard accessory view?

168. Which will create a singleton class that is compatible with ARC?

169. Which compares NSString while ignoring case?

170. How can an alert message/pop-up dialog box be shown in iOS?

171. Which will get the position of UIView within the entire UIWindow?

172. Which will create a singleton class that is compatible with ARC?

173. Which is a valid JSON string?

174. What would be examples of troubleshooting steps to do, when Xcode displays a launching remote program error?

175. Which are true regarding the usage of NSinteger and int in iOS?

176. Which programmatically avoids auto-lock?

177. Which debugging tasks are provided by Xcode to find and squash bugs in your code?

178. Locking all connections before editing the Nib files can be achieved by using:

179. Which debugging tasks are provided by Xcode to find and squash bugs in your code?

180. In a Cocoa framework, how do the UIKit classes UIControl, UITextField, UIButton, and UITableView deliver their services?

181. What is the default value of the fontSize property of the CATextLayer class?

183. Which copy functions will you use in Objective-C to create an entirely new compound object?

184. Which languages can be used to write the code for Xcode projects?

185. Which properties of the CAKeyframeAnimation class represents an optional array of NSNumber objects that define the duration of each keyframe segment?

186. By default, is the search interface visible in the UISearchDisplayController class?

187. What is the default value of the borderColor property of the CALayer class?

188. Which animation class provides simple interpolation between values for a layer property?

189. What is the purpose of active executable in an Xcode project?

190. Before editing the Nibs, one should:

191. What is the return value of function CGColorGetAlpha of class CGColor?

192. What is the default value of allowsEditing property of UIImagePickerController class in iPhone OS 4.0?

193. Which properties of the UIImage class affects the way the image data is displayed when drawn?

194. When using a Cocoa framework, what will all ControlEvents method of UIControl class return in case it fails to create the object?

195. How much time in seconds will it take to display an animation if you have 60 images using UIImageView class for the property animationDuration?

196. What is the datatype of the clockwise parameter of the CGContextAddArc function of the CGContext class?

197. Which is the correct syntax for declaring a class in Objective-C?

198. Which iTunes application URLs are NOT valid?

199. When the genstrings tool discovers a key string used more than once in a single strings file, it:

200. What is the default value of the remoteParticipantVolume property of the class GKVoiceChatService in iPhone OS 4.0?

201. Which are NOT a property of UIImagePickerController class in iPhone OS 4.0?

202. Which properties of the GKSession class is readonly?

203. What type of value is assigned to the loc-args child property of alert property in an Apple Push Notification?

204. What is the default setting to refer to file locations in your Xcode project?

205. Which are the Derivative types defined in ObjectiveC?

206. What will be the return value of function ABPersonComparePeopleByName when person1 goes before person2 in class ABPersonComparePeopleByName in iPhone OS 4.0?

207. When your session becomes active, which of the following iPhone OS 4.0 audio session categories allows other audio to continue playing?

208. Which are new features to have been introduced in iPhone OS 4.0?

209. What will be the value of the clockwise parameter of the CGContextAddArc function of the CGContext class if you want to create a counterclockwise arc?

210. Which Core Audio Services framework handles positional and lowlatency audio services in iPHone OS 4.0?

211. What are universal binaries in Xcode?

212. Which type of audio files has NO size restriction?

213. What will be the return value of CFHTTPMessageApplyCredentials function of CFHTTPMessage class if the authentication is successful?

214. Consider the following code with 2 alternatives of vector operator for OpenGL ES: highp float f0,f1; highp vec4 v0, v1; Alternative 1: v0 = (v1*f0)*f1; Alternative 2: v0 = v1 * (f0 * f1); Which alternative demonstrates proper use of vector operations?

215. When you send an object a retain message in Memory Management using Objective-C, what will happen?

216. Which OpenGL ES objects is a simple 2D graphics image in a specified format?

217. While opening Nib files, which of the following should not be ignored?

218. Which methods is used for the purpose of creating your view objects in memory management?

219. What is the value type of UTTypeConformsTo key of uniform type identifier for iPhone OS 4.0?

220. Which directives are used to declare and define classes, categories, and protocols?

221. What is the datatype of the parameter inValidBitsPerChannel for the function CalculateLPCMFlags in CoreAudioTypes class in iPhone OS 4.0?

222. What is the return value of SecRandomCopyBytes function of SecRandom class in iPhone OS 4.0 if the function completes successfully?

223. Which reason will return a value of NO for the instance method startVideoCapture of class UIImagePickerController?

224. Which statement regarding Objective-C are correct?

225. Which need to be modified while localizing an application?

226. Which symbol is used as a syntactic marker for blocks of code in iPhone OS 4.0?

227. What will you get from the default database? NSUserDefaults *defs = [NSUserDefaults standardUserDefaults]; NSArray *languages = [defs objectForKey:@'AppleLanguages']; NSString *preferredLang = [languages objectAtIndex:0];

228. What is the data type of extendStart parameter of function CGShadingCreateAxial of class CGShading?

229. The genstrings tool can parse _____.

230. What is the functionality of the beta parameter of function catlas_caxpby in class cblas?

231. Which Audio Toolbox framework file defines an interface for reading and writing audio data in files in iPhone OS 4.0?

232. Which is NOT the default behavior of an audio session in iPhone OS?

233. Which properties of ADBannerView class are readonly?

234. Which is NOT a parameter of function SecKeyDecrypt of the class SecCertificate in iPhone OS 4.0?

235. Which terms are related to Memory Management in Objective-C?

236. Which defined types is a dynamic object type in Objective-C?

237. Which part of the HTTP Live Streaming is responsible for taking input streams of media and encoding them digitally?

238. Which properties of the UIImage class are not in use after iOS 4.2?

239. You want to animate a layer's opacity to 0 while moving it further away in the layer. Which of the following code snippets will you use?

240. Apple's implementation of HTTP Live Streaming supports DRM (Digital rights management).

241. What will the hitTest: object of the CALayer class return if the point lies outside the receiver's bounds rectangle?

242. Which Core Audio Service framework is used to record, play back, pause, loop, and synchronize audio in iPhone OS 4.0?

243. What method definition do if the value of the accessed counter is 0? - (void)discardContentIfPossible

244. If the code is written using the Core Foundation and Foundation macros, the simplest way to create strings files is:

245. What is the function of the Code Sense feature in Xcode?

246. Which statement is correct regarding functions fopen and open in generic C?

247. What happens if Xcode is not able to find a file or folder at the path defined for it in the project?

248. If you want to rotate an object using Core Animation, in radians, in the z axis, which of the following key paths of a layer’s CATransform3D matrix will you use?

249. Which VOIP protocols manages the searching of a user's call history?

250. Which type of queues is provided and managed by Grand Central Dispatch (GCD), using which, an app can submit tasks, in the form of block objects?

251. Which classes in the CallKit framework declares a programmatic interface for objects that represent a telephony action?

252. In Sirikit, which protocol is used to get the current status of a car's locks?

253. In iOS1O CodeData, NSPersistentContainer uses a new class to describe the conf‌iguration information to pass to NSPersistentStoreCoordinator. while adding a persistent store. That class is:

254. Which protocol is used to present custom content in the Siri and Maps interfaces?

255. The INGetCarLockStatuslntent class in SiriKit is inherited from which class?

256. Which method manage the execution of work items in a queue?

257. Which class object is used to perform certain tasks, in response of a delivered notification?

258. Which class is used to find and monitor the available capture devices on a system (iphone/ipad)?

259. Which Messages framework classes is used to create and update messages?

260. Which of the following classes defines an object, which specifies if the widget has content to display?

261. Grand Central Dispatch (GCD) provides functions to access several common dispatch queues in an application. Which of the following functions, when called from inside a block object, returns the queue, to which the block was originally submitted for queuing?

262. Correct sequence of steps for creating an object that supports background downloading? 1: Create the conf‌iguration object using the backgroundSessionConf‌igurationWithldentifier method of NSURLSessionConf‌iguration. 2: Set the discretionary property of the configuration object to YES, in case the app starts the transfer while in foreground. 3: Set the value of the conf‌iguration object's sessionSendsLaunchEvents property to YES. 4: Use the conf‌iguration object to create your NSURLSession object.

263. Which function is used to provide the largest data packet, which the operating system guarantees, can be sent without fragmentation?

264. Which function participate in the preparation of a session, using the SecureTransport API?

265. Which primary ATS keys disables all ATS restrictions for media. which an app loads using the AV Foundation framework?

266. Which protocol define the methods to handle the displaying and editing of content in the Today Widget?

267. Which App Extension points handle tasks related to supporting Siri integration with an iOS App?

268. Sliced apps are supported by devices running:

269. Which classes handles the communication between a user and an app involving the intent object?

270. Which core extensions of Intents framework represents the entry point for an Intents extension?

271. Which classes handles the editable content of a notification?

272. Which Messages framework classes is used to display a dynamically-generated list of stickers. which is capable of drag-and-drop functionality?

273. Which ApplePay JS Data Types showcases the outcome of authorizing a payment request and contains encrypted payment information?

274. Which classes manages notif‌ication-related activities for an app or app extension?

275. Which is an object that manages a memory—based data buffer in Grand Central Dispatch (GCD)?

276. Which event of the Apple Pay JS framework defines the attributes contained by the onshippingmethodselected callback function?

277. Which CodeDate classes maintains a small connection pool for allowing concurrent database operations for NSSOLiteStoreType persistent stores?

278. Which SiriKit components is a type of protocol?

279. Which Trigger class objects indicates that a notif‌ication was sent by the Apple Push Notification Service?

280. Which is a new key for the info.plist file introduced in iOS 10?

281. Which is a new class in the AVFoundation framework, which is used to provide a modern interface for capture workflows related to still photography?

282. In the AVFoundation framework, which classes has been deprecated in iOS 10?

283. Which classes is used to specify a notification's content and the condition that triggers its delivery?

284. The lNVocabulary class in SiriKit is inherited from which of the following classes?

285. In the Notif‌icationCenter framework, the NCWidgetController class is inherited from the:

286. In the AVFoundation framework, which classes contains per-pixel distance or disparity information, while capturing images using iphone 7 plus?

287. Core Data now supports pinning an NSManagedObjectContext to a specific query generation. Which of the following classes iS used to specify a pinning behavior or a specific version from another context?

288. You want to pre-order an item from an online store. The payment for the pre-order is to be done using Apple Pay. This scenario comes under which of the following transaction types?

289. You want to pay for a gym subscription for 10 months. The payment is to be made via Apple Pay. It is a type of:

290. Apple Pay uses Passkit framework. Which classes in Passkit framework is used to store information about Apple Pay Cards?

291. In SiriKit, which INSearchCallHistorylntent class instance properties is deprecated in iOS1O onwards?

292. which class object is used to manage capture activity and coordinates the flow of data from input devices to capture outputs?

293. To prevent memory leakage, iOS uses a policy based on a number, which is maintained by every reference object. What is it called?

294. Which classes provides input data to a capture session?

295. Which is the App Transport Security (ATS) exception domains dictionary keys (not primary keys)?

296. Which App Transport Security dictionary keys are of the type, Boolean?

297. Which statement is correct about NSFetchRequest?

298. In iOS 10, which is the new methods introduced in the NSManagedObject class?

299. The iMessage app is used to:

300. Which option is correct about the Operation class, NSOperation?

301. Which statement is correct about the NSManagedObject class?

302. Which App Extension points are available both in iOS and macOS?

303. In ApplePay JS, which is correct about the ApplePayPaymentRequest data type?

304. Which statement is correct about NSFetchedResuItsController?

305. In iOS, which option is correct regarding slicing?

306. In ios10, which statement is correct about Xcode auto generation of classes?

307. Which method of the UlAppIication objects are called by an app that requires additional time for the completion of a task ?

308. Which Accessing Action attributes belong to the CXAction class?

309. In iOS 10, which option is correct about pasteboard?

310. Which class have DispatchObject as the base class?

311. Which Option is the three components of App Thinning?

312. Apple Pay JavaScript API is supported on which of the following?

313. Which stage of an ln-App purchase are handled by the App Store?

314. Which statement is correct about background app modes?

315. In iOS10, which is the new behavioral changes in Core data?

316. Which function of the AVCaptureSession class manage the running state of a capture device?

317. Which option is correct regarding automatic reference counting (ARC)?

318. Which classe is deprecated in Sirikit?

319. Which statement is correct about 108 10?

320. Which statement is correct about NSManagedObjectContext?

321. We have two objects: OBJA and OBJB. OBJB points to another object OBJX. Which of the following test cases are correct related to these 3 pointers?

322. With respect to the DispatchSource.ProcessEvent event in Grand Central Dispatch (GCD), which of the following options is/are the valid instance method(s)?

323. Which statement is correct about Apple Pay Buttons?

324. Which cryptographic algorithm is supported in iOS1O or higher?