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Apex MCQs and Answers with Explanation: Apex is a programming language developed by Salesforce for building custom applications and workflows on the Salesforce platform. It is a strongly typed, object-oriented language that allows developers to create and execute complex business logic and perform database operations. Apex is widely used by Salesforce developers and administrators to customize the platform and enhance its functionality. Now, go through this article further to get the Apex MCQ Questions & Answers which will help you test your knowledge about this Apex.
Apex MCQ Questions & Answers
This article offers a set of Apex Multiple Choice Questions that can be helpful for those preparing for job interviews, certification exams, or for testing their knowledge. The Apex Quiz allows you to evaluate your knowledge, which in turn helps you understand where you stand in regard to the concepts and how much more you need to learn to become an expert in Apex.
Apex Multiple Choice Questions
| Name | Apex |
| Exam Type | MCQ (Multiple Choice Questions) |
| Category | Technical Quiz |
| Mode of Quiz | Online |
Top 58 Apex Multiple Choice Questions | Apex Quiz
1. Which language is used to write Apex code?
a) Java
b) Python
c) Ruby
d) C++
Answer: a) Java
Explanation: Apex code is a programming language that is based on Java, with some additional syntax and capabilities specific to the Salesforce platform.
2. What is the purpose of the “with sharing” keyword in Apex?
a) It ensures that only authorized users can access certain data)
b) It specifies that the code should execute with the same sharing rules as the current user.
c) It prevents the sharing rules from being applied to the current user’s data)
d) It allows code to access data outside of the current user’s sharing rules.
Answer: b) It specifies that the code should execute with the same sharing rules as the current user.
Explanation: The “with sharing” keyword is used to specify that the code should execute with the same sharing rules as the current user, meaning that the code will only be able to access data that the user has permission to access.
3. Which statement is true about Apex classes?
a) A single Apex class can be used by multiple applications.
b) Apex classes cannot be extended to create new classes.
c) Apex classes can only be used within a single application.
d) Apex classes can only be accessed by administrators.
Answer: a) A single Apex class can be used by multiple applications.
Explanation: Apex classes are reusable, and can be used by multiple applications within the same Salesforce organization.
4. Which operator is used to test for equality in Apex?
a) ==
b) =
c) !=
d) <>
Answer: a) ==
Explanation: The == operator is used to test for equality in Apex.
5. What is a trigger in Apex?
a) A type of exception that is thrown when an error occurs in the code.
b) A block of code that is executed automatically in response to a specific event.
c) A way to perform a calculation or manipulate data)
d) A way to generate reports and analyze data)
Answer: b) A block of code that is executed automatically in response to a specific event.
Explanation: A trigger in Apex is a block of code that is executed automatically in response to a specific event, such as when a record is created, updated, or deleted)
6. Which statement is true about Apex governor limits?
a) They are limits on the amount of data that can be stored in a Salesforce organization.
b) They are limits on the number of Apex classes that can be created)
c) They are limits on the amount of CPU time, memory, and other resources that can be used by Apex code.
d) They are limits on the number of users that can access a Salesforce organization.
Answer: c) They are limits on the amount of CPU time, memory, and other resources that can be used by Apex code.
Explanation: Apex governor limits are limits on the amount of CPU time, memory, and other resources that can be used by Apex code, in order to ensure that the code does not consume too many resources and cause performance issues.
7. What is an Apex interface?
a) A way to define a set of methods that a class must implement.
b) A way to create a new instance of a class.
c) A way to perform a calculation or manipulate data)
d) A way to control access to data in a Salesforce organization.
Answer: a) A way to define a set of methods that a class must implement.
Explanation: An Apex interface is a way to define a set of methods that a class must implement. This allows for more flexible and modular code, as different classes can implement the same interface and be used interchangeably.
8. Which statement is true about Apex triggers?
a) A trigger can only be defined for a single object.
b) A trigger can be defined for multiple objects.
c) A trigger can only be defined for standard objects, not custom objects.
d) A trigger can only be defined by a system administrator.
Answer: b) A trigger can be defined for multiple objects.
Explanation: An Apex trigger can be defined for one or more objects, allowing the same block of code to be executed in response to events on different objects.
9. Which statement is true about Apex test classes?
a) Test classes are optional and not necessary for deploying Apex code.
b) Test classes are only used for manual testing, not automated testing.
c) Test classes are required in order to deploy Apex code to a production environment.
d) Test classes are only used for performance testing, not functional testing.
Answer: c) Test classes are required in order to deploy Apex code to a production environment.
Explanation: Test classes are required in order to deploy Apex code to a production environment, as they help to ensure that the code functions correctly and does not cause any unintended side effects.
10. Which statement is true about Apex triggers and governor limits?
a) Triggers are exempt from governor limits.
b) Triggers can cause governor limit issues if they are not properly written.
c) Governor limits do not apply to test classes.
d) Governor limits only apply to Apex code that is executed by a system administrator.
Answer: b) Triggers can cause governor limit issues if they are not properly written.
Explanation: Triggers can cause governor limit issues if they are not properly written, as they can consume a significant amount of resources depending on the complexity of the code and the number of records being processed)
11. What is the purpose of the “without sharing” keyword in Apex?
a) It ensures that only authorized users can access certain data)
b) It specifies that the code should execute without any sharing rules applied)
c) It allows code to access data outside of the current user’s sharing rules.
d) It prevents sharing rules from being applied to child records when querying parent records.
Answer: b) It specifies that the code should execute without any sharing rules applied)
Explanation: The “without sharing” keyword is used to specify that the code should execute without any sharing rules applied, meaning that the code will be able to access all data regardless of the current user’s permissions.
12. Which statement is true about Apex classes and inheritance?
a) Apex classes can only inherit from other Apex classes that are defined in the same file.
b) Apex classes can only inherit from other Apex classes that are defined in the same namespace.
c) Apex classes can inherit from any other Apex class, regardless of where it is defined)
d) Apex classes cannot inherit from any other classes.
Answer: c) Apex classes can inherit from any other Apex class, regardless of where it is defined)
Explanation: Apex classes can inherit from any other Apex class, regardless of where it is defined, as long as the class is marked as “global” or “public”.
13. What is the difference between a static method and an instance method in Apex?
a) A static method can only be called on an instance of a class, while an instance method can be called on the class itself.
b) A static method is defined within a class, while an instance method is defined outside of a class.
c) A static method operates on class-level data, while an instance method operates on instance-level data)
d) A static method can only be called within a trigger, while an instance method can be called from anywhere in the code.
Answer: c) A static method operates on class-level data, while an instance method operates on instance-level data
14. What is the purpose of the “try-catch” block in Apex?
a) It is used to handle exceptions that might occur during the execution of the code.
b) It is used to define a loop that iterates over a collection of records.
c) It is used to execute code in parallel across multiple threads.
d) It is used to define a section of code that should be executed only if a certain condition is met.
Answer: a) It is used to handle exceptions that might occur during the execution of the code.
Explanation: The “try-catch” block is used to handle exceptions that might occur during the execution of the code, allowing the code to gracefully handle any errors that might occur and prevent the entire program from crashing.
15. Which statement is true about Apex data types?
a) All Apex data types are nullable by default.
b) Apex supports both primitive and complex data types.
c) Apex data types cannot be assigned to variables.
d) Apex data types are limited to the basic data types (e.g. integer, string, etc))
Answer: b) Apex supports both primitive and complex data types.
Explanation: Apex supports both primitive data types (e.g. integer, boolean, etc)) and complex data types (e.g. objects, arrays, etc)), allowing for more complex data structures to be defined and manipulated)
16. What is the purpose of the “set” keyword in Apex?
a) It is used to define a loop that iterates over a collection of records.
b) It is used to define a section of code that should be executed only if a certain condition is met.
c) It is used to define a collection of unique values.
d) It is used to define a variable that cannot be modified)
Answer: c) It is used to define a collection of unique values.
Explanation: The “set” keyword is used to define a collection of unique values, allowing for easy manipulation and de-duplication of data)
17. Which statement is true about Apex maps?
a) Maps are limited to a maximum of 100,000 entries.
b) Maps can only store primitive data types, not objects.
c) Maps are unordered collections of key-value pairs.
d) Maps can only be used within a trigger.
Answer: c) Maps are unordered collections of key-value pairs.
Explanation: Apex maps are unordered collections of key-value pairs, allowing for easy retrieval and manipulation of data based on a specific key.
18. What is the purpose of the “interface” keyword in Apex?
a) It is used to define a type of object that can be used to represent a database table.
b) It is used to define a type of object that can be used to represent a user interface component.
c) It is used to define a set of methods that a class must implement.
d) It is used to define a section of code that should be executed only if a certain condition is met.
Answer: c) It is used to define a set of methods that a class must implement.
Explanation: An interface is a contract that specifies a set of methods that a class must implement in order to be considered “compatible” with the interface. This allows for greater flexibility and reusability of code.
19. Which statement is true about Apex exceptions?
a) Apex exceptions can only be caught by using a “try-catch” block.
b) Apex exceptions can only be thrown by the system, not by custom code.
c) Apex exceptions can be used to control the flow of the program.
d) Apex exceptions are only used for debugging purposes.
Answer: a) Apex exceptions can only be caught by using a “try-catch” block.
Explanation: Apex exceptions can only be caught by using a “try-catch
20. What is the purpose of the “super” keyword in Apex?
a) It is used to call a method or constructor of a parent class.
b) It is used to define a loop that iterates over a collection of records.
c) It is used to define a section of code that should be executed only if a certain condition is met.
d) It is used to define a collection of unique values.
Answer: a) It is used to call a method or constructor of a parent class.
Explanation: The “super” keyword is used to call a method or constructor of a parent class, allowing for inheritance and reuse of code.
21 .What is the purpose of the “finally” block in Apex?
a) It is used to define a loop that iterates over a collection of records.
b) It is used to define a section of code that should be executed only if a certain condition is met.
c) It is used to specify code that should always be executed, regardless of whether an exception occurs or not.
d) It is used to define a collection of unique values.
Answer: c) It is used to specify code that should always be executed, regardless of whether an exception occurs or not.
Explanation: The “finally” block is used to specify code that should always be executed, regardless of whether an exception occurs or not. This allows for cleanup and finalization of resources.
22. What is the purpose of the “this” keyword in Apex?
a) It is used to define a loop that iterates over a collection of records.
b) It is used to define a section of code that should be executed only if a certain condition is met.
c) It is used to refer to the current object or instance of a class.
d) It is used to define a collection of unique values.
Answer: c) It is used to refer to the current object or instance of a class.
Explanation: The “this” keyword is used to refer to the current object or instance of a class, allowing for easy access to instance variables and methods.
23. Which statement is true about Apex unit tests?
a) Apex unit tests must be written using the same language as the main code.
b) Apex unit tests can only be run by users with administrative privileges.
c) Apex unit tests must cover at least 50% of the code in order to be considered complete.
d) Apex unit tests can only be run manually and cannot be automated)
Answer: c) Apex unit tests must cover at least 50% of the code in order to be considered complete.
Explanation: Apex unit tests must cover at least 50% of the code
24. Which statement is true about Apex interfaces?
a) Apex interfaces can be instantiated and used directly.
b) Apex interfaces can only contain method signatures, not implementation.
c) Apex interfaces can only be implemented by classes in the same namespace.
d) Apex interfaces can only be used to define custom objects.
Answer: b) Apex interfaces can only contain method signatures, not implementation.
Explanation: Apex interfaces can only contain method signatures, not implementation. This allows for greater flexibility and customization when implementing interfaces.
25. What is the purpose of the “static” keyword in Apex?
a) It is used to define a loop that iterates over a collection of records.
b) It is used to define a section of code that should be executed only if a certain condition is met.
c) It is used to define a method or variable that belongs to the class itself, rather than an instance of the class
d) It is used to define a collection of unique values.
Answer: c) It is used to define a method or variable that belongs to the class itself, rather than an instance of the class.
Explanation: The “static” keyword is used to define a method or variable that belongs to the class itself, rather than an instance of the class. This allows for easier access and use of shared resources.
26. What is the purpose of the “return” keyword in Apex?
a) It is used to define a loop that iterates over a collection of records.
b) It is used to define a section of code that should be executed only if a certain condition is met.
c) It is used to specify the value returned by a method)
d) It is used to define a collection of unique values.
Answer: c) It is used to specify the value returned by a method)
Explanation: The “return” keyword is used to specify the value returned by a method) This allows for greater control over the behavior and output of methods.
27. Which statement is true about Apex access modifiers?
a) Apex does not support access modifiers.
b) Apex access modifiers can be used to restrict access to classes, methods, and variables.
c) Apex access modifiers can only be used to make code public)
d) Apex access modifiers are optional and do not affect the behavior of code.
Answer: b) Apex access modifiers can be used to restrict access to classes, methods, and variables.
Explanation: Apex access modifiers can be used to restrict access to classes, methods, and variables, allowing for greater control over data privacy and security.
28. Which of the following is NOT a valid Apex access modifier?
a) public
b) private
c) protected
d) final
Answer: d) final
Explanation: “final” is not an access modifier in Apex. It is used to declare a variable or method that cannot be overridden or modified)
29. Which statement is true about Apex variables?
a) Apex variables must be declared with a specific data type.
b) Apex variables can be declared without a specific data type.
c) Apex variables cannot be initialized with a default value.
d) Apex variables are always initialized with a null value.
Answer: a) Apex variables must be declared with a specific data type.
Explanation: Apex variables must be declared with a specific data type before they can be used) This ensures data consistency and prevents errors.
30. What is the purpose of the “new” keyword in Apex?
a) It is used to create a new instance of a class.
b) It is used to define a loop that iterates over a collection of records.
c) It is used to define a section of code that should be executed only if a certain condition is met.
d) It is used to define a collection of unique values.
Answer: a) It is used to create a new instance of a class.
Explanation: The “new” keyword is used to create a new instance of a class in Apex. This allows for the creation of multiple instances of the same class, each with their own set of data and behavior.
31. Which statement is true about Apex constructors?
a) Apex constructors must have the same name as the class.
b) Apex constructors cannot take parameters.
c) Apex constructors cannot be overloaded)
d) Apex constructors are optional and do not need to be defined)
Answer: a) Apex constructors must have the same name as the class.
Explanation: Apex constructors must have the same name as the class they are defined in. This ensures that the constructor is called when a new instance of the class is created)
32. Which statement is true about Apex exception handling?
a) Apex does not support exception handling.
b) Apex exception handling is optional and does not need to be implemented)
c) Apex exception handling is used to catch and handle errors that occur during program execution.
d) Apex exception handling is used to terminate the program when an error occurs.
Answer: c) Apex exception handling is used to catch and handle errors that occur during program execution.
Explanation: Apex exception handling is used to catch and handle errors that occur during program execution, preventing the program from crashing and allowing for graceful error handling.
33. Which statement is true about Apex collections?
a) Apex collections are only used to store primitive data types.
b) Apex collections cannot be used to store objects.
c) Apex collections can be of fixed or variable size.
d) Apex collections can only be used to store a single data type.
Answer: c) Apex collections can be of fixed or variable size.
Explanation: Apex collections can be of fixed or variable size, allowing for flexibility in data modeling and manipulation.
34. What is the purpose of the “List” data type in Apex?
a) It is used to store a collection of objects.
b) It is used to store a collection of primitive data types.
c) It is used to store a collection of records from a database.
d) It is used to store a collection of boolean values.
Answer: a) It is used to store a collection of objects.
Explanation: The “List” data type in Apex is used to store a collection of objects. This allows for the manipulation and processing of multiple objects at once.
35. What is the purpose of the “Map” data type in Apex?
a) It is used to store a collection of objects.
b) It is used to store a collection of primitive data types.
c) It is used to store a collection of records from a database.
d) It is used to store a collection of key-value pairs.
Answer: d) It is used to store a collection of key-value pairs.
Explanation: The “Map” data type in Apex is used to store a collection of key-value pairs. This allows for the mapping of one set of data to another set of data for easy access and manipulation.
36. Which statement is true about Apex sets?
a) Apex sets are used to store a collection of objects.
b) Apex sets are used to store a collection of primitive data types.
c) Apex sets can be of fixed or variable size.
d) Apex sets can only contain unique values.
Answer: d) Apex sets can only contain unique values.
Explanation: Apex sets can only contain unique values, preventing the duplication of data and ensuring data consistency.
37. What is the purpose of the “if-else” statement in Apex?
a) It is used to define a loop that iterates over a collection of records.
b) It is used to define a section of code that should be executed only if a certain condition is met.
c) It is used to define a collection of unique values.
d) It is used to terminate the program when an error occurs.
Answer: b) It is used to define a section of code that should be executed only if a certain condition is met.
Explanation: The “if-else” statement in Apex is used to define a section of code that should be executed only if a certain condition is met. This allows for conditional logic and branching in the program.
38. Which statement is true about Apex loops?
a) Apex loops can only be used to iterate over a collection of records.
b) Apex loops can only be used to iterate over a collection of objects.
c) Apex loops can only be used to iterate a fixed number of times.
d) Apex loops can be used to iterate over a collection of any data type.
Answer: d) Apex loops can be used to iterate over a collection of any data type.
Explanation: Apex loops can be used to iterate over a collection of any data type, allowing for flexibility in program design and data processing.
39. What is the purpose of the “for” loop in Apex?
a) It is used to iterate over a collection of objects.
b) It is used to define a section of code that should be executed only if a certain condition is met.
c) It is used to define a collection of unique values.
d) It is used to terminate the program when an error occurs.
Answer: a) It is used to iterate over a collection of objects.
Explanation: The “for” loop in Apex is used to iterate over a collection of objects, allowing for the processing and manipulation of multiple objects at once.
40. What is the purpose of the “while” loop in Apex?
a) It is used to iterate over a collection of objects.
b) It is used to define a section of code that should be executed only if a certain condition is met.
c) It is used to define a collection of unique values.
d) It is used to terminate the program when an error occurs.
Answer: b) It is used to define a section of code that should be executed only if a certain condition is met.
Explanation: The “while” loop in Apex is used to define a section of code that should be executed only if a certain condition is met. The loop will continue to iterate as long as the condition is true.
41. What is the purpose of the “do-while” loop in Apex?
a) It is used to iterate over a collection of objects.
b) It is used to define a section of code that should be executed only if a certain condition is met.
c) It is used to define a collection of unique values.
d) It is used to execute a section of code at least once, and then continue to iterate as long as a certain condition is met.
Answer: d) It is used to execute a section of code at least once, and then continue to iterate as long as a certain condition is met.
Explanation: The “do-while” loop in Apex is used to execute a section of code at least once, and then continue to iterate as long as a certain condition is met. This is useful when you want to ensure that a certain code block is executed at least once before checking the condition.
42. What is the purpose of an Apex constructor?
a) It is used to create a new instance of an object.
b) It is used to destroy an instance of an object.
c) It is used to initialize the data members of an object.
d) It is used to define the methods of an object.
Answer: c) It is used to initialize the data members of an object.
Explanation: An Apex constructor is used to initialize the data members of an object when a new instance of the object is created)
43. What is the purpose of an Apex trigger?
a) It is used to define a collection of methods.
b) It is used to define a collection of data types.
c) It is used to define a collection of objects.
d) It is used to execute a section of code in response to a specific event.
Answer: d) It is used to execute a section of code in response to a specific event.
Explanation: An Apex trigger is used to execute a section of code in response to a specific event, such as the creation, deletion, or update of a record)
44. What is the purpose of the “throw” statement in Apex?
a) It is used to terminate the program when an error occurs.
b) It is used to generate an exception and halt the program.
c) It is used to define a collection of unique values.
d) It is used to define a section of code that should be executed only if a certain condition is met.
Answer: b) It is used to generate an exception and halt the program.
Explanation: The “throw” statement in Apex is used to generate an exception and halt the program. This is useful for handling errors and directing program flow.
45. What is the purpose of the “try-catch-finally” block in Apex?
a) It is used to define a section of code that should be executed only if a certain condition is met.
b) It is used to define a collection of unique values.
c) It is used to execute a section of code that may generate an exception, handle the exception if it occurs, and then execute a section of code regardless of whether an exception occurred
d) It is used to terminate the program when an error occurs.
Answer: c) It is used to execute a section of code that may generate an exception, handle the exception if it occurs, and then execute a section of code regardless of whether an exception occurred)
Explanation: The “try-catch-finally” block in Apex is used to execute a section of code that may generate an exception, handle the exception if it occurs, and then execute a section of code regardless of whether an exception occurred) This is useful for handling errors, cleaning up resources, and ensuring that certain code is always executed)
46. Which of the following is a valid way to instantiate a new object in Apex?
a) new object_name;
b) object_name = new;
c) object_name = new();
d) object_name = new object();
Answer: c) object_name = new();
Explanation: In Apex, a new object can be instantiated using the “new” keyword followed by the name of the object and parentheses. For example, to instantiate a new Contact object, you would use the following syntax: Contact contact = new Contact();
47. Which of the following is true about the “instanceof” operator in Apex?
a) It is used to compare two objects for equality.
b) It is used to check whether an object is an instance of a particular class or interface.
c) It is used to access a particular method or property of an object.
d) It is used to define a new object type.
Answer: b) It is used to check whether an object is an instance of a particular class or interface.
Explanation: The “instanceof” operator in Apex is used to check whether an object is an instance of a particular class or interface. This is useful for checking the type of an object before attempting to perform certain operations on it.
48. Which of the following is true about Apex classes?
a) They are used to define custom data types.
b) They are used to define custom methods and properties.
c) They can be used to define custom exceptions.
d) All of the above.
Answer: d) All of the above.
Explanation: Apex classes are used to define custom data types, custom methods and properties, and even custom exceptions. This allows developers to create complex and customized solutions within the Salesforce platform.
49. Which of the following is not a data type in Apex programming language?
a) Integer
b) Float
c) String
d) Character
Answer: d) Character –
Explanation: Apex does not have a character data type.
50. What is the output of the following code?
Integer x = 5;
System.debug(x++);
a) 5
b) 6
c) Compile error
d) Runtime error
Answer: a) 5 – The post-increment operator returns the original value of x, which is 5, and then increments it to 6.
51. Which of the following is not a valid access modifier in Apex?
a) public
b) private
c) protected
d) final
Answer: d) final –
Explanation: final is not an access modifier in Apex.
52. Which of the following is not a collection data type in Apex?
a) List
b) Set
c) Stack
d) Dictionary
Answer: c) Stack
Explanation: Apex does not have a Stack data type.
53. What is the output of the following code?
String s = ‘Hello’;
s.toUpperCase();
System.debug(s);
a) Hello
b) HELLO
c) Compile error
d) Runtime error
Answer: a) Hello
Explanation: The toUpperCase() method returns a new string with all characters in uppercase, but it does not modify the original string.
54. What is the output of the following code?
List<Integer> nums = new List<Integer>{1, 2, 3};
System.debug(nums[3]);
a) 1
b) 2
c) 3
d) Index out of bounds error
Answer: d) Index out of bounds error
Explanation: The list nums has only three elements, so nums[3] is out of bounds.
55. Which of the following is not a valid loop construct in Apex?
a) for
b) while
c) do-while
d) until
Answer: d) until
Explanation: Apex does not have an until loop construct.
56. Which of the following is not a valid Apex trigger event?
a) before insert
b) after insert
c) before update
d) before delete
Answer: b) after insert
Explanation: Apex has a before insert trigger event, but not an after insert event.
57. Which of the following is not a valid SOQL operator?
a) =
b) !=
c) <>
d) <
Answer: c) <>
Explanation: The not equal to operator in SOQL is !=.
58. Which of the following is not a valid Apex collection method?
a) add()
b) remove()
c) contains()
d) replace()
Answer: d) replace()
Explanation: There is no replace() method in the Apex collection classes.
Apex is a powerful programming language used in Salesforce to build custom applications and workflows. These Top Apex MCQs and Answers provide a comprehensive understanding of the language, which can be helpful for developers looking to improve their skills and knowledge. If you find this article useful in learning new things about Apex and wish to receive similar updates, kindly follow our Freshersnow website daily.