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programming languages Online Quiz - 351

Description: programming languages Online Quiz - 351
Number of Questions: 21
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Tags: programming languages
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2.What is the correct JavaScript syntax to write "Hello World"?

technology programming languages

  1. response.write("Hello World")

  2. document.write("Hello World")

  3. ("Hello World")

  4. "Hello World"

Show answer
Correct Option: B
Explanation:

To write "Hello World" in JavaScript, the correct syntax is:

B. document.write("Hello World")

Explanation:

A. response.write("Hello World"): This is not the correct syntax. The "response" object does not have a "write" method in JavaScript.

B. document.write("Hello World"): This is the correct syntax. The "document" object represents the current web page, and the "write" method is used to write content directly to the web page. In this case, it will write "Hello World" to the page.

C. ("Hello World"): This is not the correct syntax. Parentheses alone do not have any specific meaning in JavaScript.

D. "Hello World": This is a string literal and is valid syntax in JavaScript. However, it does not actually write "Hello World" to the web page. It is just a static string value that can be assigned to a variable or used in other operations.

Therefore, the correct answer is B. document.write("Hello World").

7.How does a "for" loop start?
technology programming languages

  1. for (i = 0; i <= 5; i++)

  2. for i = 1 to 5

  3. for (i <= 5; i++)

  4. for (i = 0; i <= 5)

Show answer
Correct Option: A

Which SQL statement selects all rows from table called Contest, with column ContestDate having values greater or equal to May 25, 20006?
technology programming languages

  1. SELECT * FROM Contest WHERE ContestDate < '05/25/2006'

  2. SELECT * FROM Contest HAVING ContestDate >= '05/25/2006'

  3. SELECT * FROM Contest WHERE ContestDate >= '05/25/2006'

  4. None of the above

Show answer
Correct Option: C

What is the INSERT command used for?
technology programming languages

  1. To retrieve data.

  2. To insert data.

  3. To modify data.

  4. All the above

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Correct Option: B

Which SQL keyword is used to retrieve only unique values?
technology programming languages

  1. UNIQUE

  2. DISTINCTIVE

  3. DIFFERENT

  4. DISTINCT

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Correct Option: D

The TRUNCATE TABLE…?

technology programming languages

  1. checks if the table has primary key specified

  2. deletes the table

  3. deletes all rows from a table

  4. None of the above

Show answer
Correct Option: C

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) checks if the table has primary key specified - This option is incorrect. The TRUNCATE TABLE statement does not check if the table has a primary key specified. It is used to delete all rows from a table, regardless of the presence of a primary key.

Option B) deletes the table - This option is incorrect. The TRUNCATE TABLE statement does not delete the table itself. It only deletes all rows from the table, leaving the table structure intact.

Option C) deletes all rows from a table - This option is correct. The TRUNCATE TABLE statement is used to delete all rows from a table, effectively removing all data from it. This is different from the DELETE statement, which can be used to delete specific rows or a subset of rows based on certain conditions.

Option D) None of the above - This option is incorrect. The correct answer is option C, as explained above.

The correct answer is C) deletes all rows from a table. This option is correct because the TRUNCATE TABLE statement is specifically used for this purpose.

Which of the following SQL clauses is used to sort a result set?

technology programming languages

  1. ARRANGE

  2. ORDER BY

  3. SORT

  4. None Of The Above

Show answer
Correct Option: B

Java is a strongly-typed language

technology programming languages

  1. True

  2. False

Show answer
Correct Option: A

AI Explanation

To answer this question, you need to understand the concept of strongly-typed languages.

Option A) True - This option is correct. Java is indeed a strongly-typed language. In strongly-typed languages like Java, each variable must be declared with its data type, and the type of a variable cannot be changed after it is declared. This strict type checking ensures that variables are used in a consistent and predictable manner.

Option B) False - This option is incorrect. Java is a strongly-typed language, as explained above.

The correct answer is A) True. Java is a strongly-typed language because it requires explicit declaration of variable types and enforces strict type checking.

Newly created threads take the priority of the threads that create them.
technology programming languages

  1. True

  2. False

Show answer
Correct Option: A

A single source file can contain multiple class definitions, each having any access modifier.

technology programming languages

  1. True

  2. False

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Correct Option: B

Class variables can be accessed only with the class name.

technology programming languages

  1. True

  2. False

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Correct Option: B

The finalize method will only be called once, if called at all.

technology programming languages

  1. True

  2. False

Show answer
Correct Option: A

A thread is a process

technology programming languages

  1. True

  2. False

Show answer
Correct Option: B

System class provides facilities to load files and libraries, and to create them.

technology programming languages

  1. True

  2. False

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Correct Option: B

When a method is overridden, the overriding method can throw only the same exceptions as the overridden method, a subset of them or subclasses of the exceptions.

technology programming languages

  1. True

  2. False

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Correct Option: A

All methods within a final class are implicitly final.

technology programming languages

  1. True

  2. False

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Correct Option: A

All non-assignment operators are evaluated from left to right.

technology programming languages

  1. True

  2. False

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Correct Option: A

What are various privileges that a user can grant to another user?
technology programming languages

  1. SELECT, CONNECT, RESOURCE

  2. SELECT,INSERT,DELETE

  3. INSERT,DELETE,MODIFY,

  4. None Of The Above

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Correct Option: A

Can a primary key contain more than one columns?

technology programming languages

  1. True

  2. False

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Correct Option: A

How you will avoid duplicating records in a query?

technology programming languages

  1. DISTINCT

  2. UNIQUE

  3. DISTINCT and UNIQUE

  4. None Of The Above

Show answer
Correct Option: A

Can we define exceptions twice in same block ?

technology programming languages

  1. True

  2. False

Show answer
Correct Option: B

AI Explanation

To answer this question, we need to understand how exceptions are defined in programming.

In most programming languages, including Python, it is not possible to define the same exception twice within the same block. This is because an exception is typically defined as a class or object, and you cannot have two classes or objects with the same name within the same scope.

Therefore, the correct answer is B) False.

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