Upwork OBJECTIVE C TEST 2016

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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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