Upwork OBJECTIVE C TEST 2018

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1. What’s the difference between copy and deepCopy?

Answers:

1. They are the same
2. deepCopy doesn’t exist
3. copy creates a copy at the first level, while deepCopy copies the instance variables
4. copy creates a proxy object, while deepCopy allocate a new object
5. None of the above

2. Which of the following can be inherited?

Answers:

1. Categories
2. Protocols
3. Classes
4. None of the above

3. Which of the following is the fastest?

Answers:

1. @synchronized
2. Explicit locking
3. Condition locking
4. Mutex implicit locking

4. A method can be tagged to be called only by a specific class and its subclasses.

Answers:

1. True
2. False

5. Which of the following is not recommended?

Answers:

1. Adding an (id)sender argument to methods
2. Using static variables inside methods
3. Using C code inside Obj-C methods
4. None of the above

6. A class can have two methods with the same name, but with different argument types.

Answers:

1. True
2. False

7. What are @try and @catch?

Answers:

1. Exception handlers
2. Exceptions
3. Exception keywords
4. All of the above

8. A class can conform to only one protocol.

Answers:

1. True
2. False

9. How do you free an object?

Answers:

1. free(obj)
2. [obj dealloc]
3. [obj release]
4. [obj free]
5. None of the above

10. Which of the following creates a class that conforms to a protocol?

Answers:

1. @interface ClassName [ProtocolName]
2. @interface ClassName <ProtocolName>
3. @interface ClassName < ProtocolName
4. @interface ClassName::ProtocolName
5. @interface ClassName(ProtocolName)

11. What is the isa variable in objects?

Answers:

1. Object size
2. Object memory footprint
3. Object class identification
4. Object serial number
5. None of the above

12. What is true regarding C functions inside .m files?

Answers:

1. They can contain Obj-C code
2. They are slower than if in a .c files
3. They cannot use C libraries
4. They can be static

13. What is the id type?

Answers:

1. A generic C type that Objective-C uses for an arbitrary object
2. A memory address type
3. A type to hold serialized objects
4. The type used for Classes
5. None of the above

14. What is a @finally block?

Answers:

1. A block that is executed when the program quits
2. A block that is executed within a dynamic library when it’s unloaded
3. A block of code that is run whenever an exception is thrown or not
4. None of the above

15. Is the following code a correct allocation?

MyClass myObj;

[&myObj aMessage];

Answers:

1. Yes
2. No

16. What does the following imply?

Worker *ceo = [[Worker alloc] init];

ceo->boss = nil;

Answers:

1. That the ceo object is statically typed
2. That the boss instance variable is declared @protected
3. That the boss instance variable is declared @public
4. That the ceo is in fact a structure
5. This code is not correct

17. What is not supported in Obj-C?

Answers:

1. Recursive method call
2. Variable argument count to method
3. Byte manipulation
4. Method argument default value
5. None of the above

18. Which of the following does not happen when you throw an exception in a @synchronized block?

Answers:

1. The object is deallocated
2. The object is unlocked
3. An exception is thrown
4. None of the above

19. Can you send messages to nil?

Answers:

1. Yes
2. No

20. In which version of Objective-C did the fast enumeration system appear?

Answers:

1. 2.0
2. 1.5
3. 1.0
4. 3.0

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

Answers:

1. C libraries
2. Java jar files
3. C++ libraries
4. scripts
5. Executables

22. What is the C type used to work with objects in Obj-C?

Answers:

1. int
2. structure
3. pointer
4. array

23. What is a category?

Answers:

1. A namespace
2. A category is a way to add instance variables to a class which already exists
3. A category is a group of classes
4. A category is a way to add methods to a class which already exists
5. None of the above

24. Protocols are like classes; they can inherit.

Answers:

1. True
2. False

25. What comments are supported in Obj-C?

Answers:

1. // Line comments
2. /* Block comments */
3. # Line comments
4. ; Line comments
5. -[[ block comments ]]

26. Which of the following is false?

Answers:

1. Method lookup is done at runtime
2. When a method is called, the send is automatically available as the sender variable, like self or super
3. Messages can be sent to nil
4. Methods in static libraries must be present at link time

27. What happens if two categories define methods with the same names for the same class?

Answers:

1. The code won’t compile
2. At runtime, either method will be called
3. A runtime exception will be thrown
4. None of the above

28. What type of variable do you need to use to implement singletons?

Answers:

1. static
2. auto
3. const
4. volatile

29. As categories can’t have instance variables, what class could you use to implement a full class only with categories?

Answers:

1. NSArray
2. NSMutableDictionary
3. NSSet
4. None of the above

30. What can you do with categories?

Answers:

1. Add instance variables to a class without subclassing it
2. Add methods to a class without subclassing it
3. Override methods of a class without subclassing it
4. None of the above

31. How do you throw an exception?

Answers:

1. raise Exception
2. @throw exception
3. RAISE exception
4. THROW exception
5. None of the above

32. What is true regarding strings?

Answers:

1. C string literals are automatically mapped to objects
2. C string literals can be used in Obj-C
3. Obj-C strings are not of static storage<m/span>
4. Obj-C strings are like C strings

33. In which version of Objective-C did the properties system appear?

Answers:

1. 3.0
2. 2.5
3. 2.0
4. 1.5
5. 1.0

34. How do you include the root “Object” class?

Answers:

1. #include <Object.h>
2. #include <objc/Object.h>
3. #include <Object/Object.h>
4. #include <ROOT.h>
5. It depends on the compiler

35. What is the default visibility for instance variables?

Answers:

1. @private
2. @package
3. @public
4. @protected
5. None of the above

36. What is true regarding @protected?

Answers:

1. The instance variable is accessible within the class that declares it and within classes that inherit it
2. The instance variable is accessible everywhere
3. The instance variable is accessible only within the class that declares it.
4. This is analogous to private_extern for variables and functions. Any code outside the class implementation’s image that tries to use the instance variable will get a link error
5. None of the above

37. What happens if you release an unretained object twice?

Answers:

1. Nothing, too many releases are handled correctly
2. Undefined behaviour
3. MemoryException is raised
4. None of the above

38. What is a protocol?

Answers:

1. A class that uses functions instead of methods
2. A method signature
3. A class signature
4. An interface without an implementation
5. None of the above

39. In Obj-C 2.0, what do the fast enumeration protocols rely on to provide fast Enumerations?

Answers:

1. C arrays
2. Java Vectors
3. Ruby hash
4. Obj-C Array
5. None of the above

40. Which of the following is incorrect?

Answers:

1. [self release]
2. [super release]
3. [AClass release]
4. They are all correct

41. What can you use to avoid the msgSend function overhead?

Answers:

1. SEL
2. IMP
3. You can’t use anything
4. None of the above

42. How do you allocate an object?

Answers:

1. MyClass *obj = malloc(sizeof(MyClass));
2. MyClass *obj = [MyClass alloc];
3. MyClass *obj = alloc(MyClass);
4. MyClass *obj = [MyClass new];
5. None of the above

43. Which C feature is not supported in Obj-C?

Answers:

1. Bitfields
2. Compound literals
3. Structures
4. C arrays
5. Support is compiler dependant

44. What does Obj-C not support?

Answers:

1. Instance variables
2. Class variables
3. Static variables
4. Automatic variables

45. What will be the output of the following code?

static int

a (void)

{

printf (“an”);

return 0;

}

static int

b (void)

{

printf (“bn”);

return 1;

}

static int

c (void)

{

printf (“cn”);

return 2;

}

int

main (int argc, const char *argv[])

{

printf (“%d %d %d”, a (), b (), c ());

return 0;

}

Answers:

1. a b c 0 1 2
2. a b c 2 1 0
3. c b a 0 1 2
4. c b a 2 1 0
5. None of the above

46. When using the garbage collector, which method, that is normally called without the collector, is not called on your objects where they are collected?

Answers:

1. free
2. dealloc
3. destroy
4. uninit

47. What is nil?

Answers:

1. The null object
2. The null class
3. It doesn’t exist
4. None of the above

48. What can be used as Object instance variables?

Answers:

1. int
2. structures
3. pointers
4. unions
5. None of the above

49. Can an exception caught in @catch be re-thrown?

Answers:

1. Yes
2. No

50. What is a SEL?

Answers:

1. A selection
2. The C type of a message selector
3. The C type of a class
4. A pointer to a method
5. None of the above

51. What is an IMP?

Answers:

1. A special type used for computation
2. An alias for SEL
3. A preprocessor directive defined to the implementation name
4. The C type of a method implementation pointer
5. None of the above

52. What is true regarding @public?

Answers:

1. It doesn’t exist in Objective-C
2. It breaks encapsulation
3. It can be used only on singleton objects
4. None of the above

53. What class specifiers are supported?

Answers:

1. FINAL
2. STATIC
3. FAST
4. ITERATIVE
5. There is no such thing as class specifiers

54. Which of the following declares a protocol?

Answers:

1. @proto ProtocolName
2. protocol ProtocolName {};
3. @protocol ProtocolName
4. @interface <ProtocolName>
5. @interface ProtocolName::Protocol

55. What is an autoreleased object?

Answers:

1. A C object.
2. A static object.
3. An object that is garbage collected.
4. An object that will be released when the current AutoreleasePool is deallocated.
5. None of the above

56. If you need to allocate custom memory, in which method will you do so?

Answers:

1. + alloc
2. – alloc
3. + init
4. – init
5. None of the above

57. What is #import

Answers:

1. A namespace import rule
2. A namespace definition
3. A recursive include
4. C preprocessor construct to avoid multiple inclusions of the same file
5. None of the above

58. What is the Obj-C runtime?

Answers:

1. A C library
2. A compiler
3. A language
4. A dynamic loader

59. What is true regarding messaging?

Answers:

1. Messaging is static and messages are replaced by function call at compile time
2. Messaging is fully dynamic, which means you can compile some code that sends a message to a class that doesn’t implement it, and add a category later, in a dynamic library for example
3. Messaging is only a syntax sugar to call functions
4. None of the above is true

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