Technical Interview Questions and Answers

Q:

A lock can be acquired on a class.

The above statement is

A) True	B) False
C) Both A and B	D) None

Answer & Explanation Answer: A) True

Explanation:

A lock can be acquired on a class. This lock is acquired on the class's Class object.

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Filed Under: Java

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Q:

Which is more effective while calling the functions?

A) call by value	B) call by reference
C) call by pointer	D) none

Answer & Explanation Answer: B) call by reference

Explanation:

In the call by reference, it will just copy the address of the variable to access it, so it will reduce the memory in accessing it.

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Filed Under: C++

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Q:

Which of the following is a properly defined structure?

A) struct {int a;}	B) struct a_struct {int a;}
C) struct a_struct int a;	D) struct a_struct {int a;};

Answer & Explanation Answer: D) struct a_struct {int a;};

Explanation:

The a_struct is declared as structure name and its data element is a.

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Filed Under: C++

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Q:

A subquery in an SQL SELECT statement is enclosed in

A) [ ]	B) { }
C) < >	D) ( )

Answer & Explanation Answer: D) ( )

Explanation:

A subquery in an SQL SELECT statement is enclosed in parenthesis (...).

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Filed Under: SQL
Job Role: Database Administration , IT Trainer , Software Architect

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Q:

Which HTML attribute is used to define inline styles?

A) <header>	B) <strong>
C) <style>	D) <alt>

Answer & Explanation Answer: C) <style>

Explanation:

The style attribute specifies an inline style for an element. The style attribute will override any style set globally,

e.g. styles specified in the <style> tag or in an external style sheet.

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Filed Under: Web Technology
Exam Prep: Bank Exams

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Q:

How to use HTTP Headers inside PHP? Write the statement through which it can be added?

Answer

HTTP headers can be used in PHP by redirection which is written as:

<?header('Location: https://www.php.net')?>

The headers can be added to HTTP response in PHP using the header(). The response headers are sent before any actual response being sent. The HTTP headers have to be sent before taking the output of any data. The statement above gets included at the top of the script.

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Subject: PHP

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Q:

What is the output of this program ?

       #include
        using namespace std;
        int n(char, int);
        int (*p) (char, int) = n;
        int main()
        {
            (*p)('d', 9);
            p(10, 9);
            return 0;
        }
        int n(char c, int i)
        {
            cout << c << i;
            return 0;
        }

A) d99	B) d9d9
C) d9	D) compile time error

Answer & Explanation Answer: A) d99

Explanation:

In this program, we have declared the values as integer instead of character, So it is printing as d99 but it will not arise an error.

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Filed Under: C++

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Q:

What is RDBMS? Explain its features.

Answer

RDBMS is a database management system based on relational model defined by E.F.Codd. Data is stored in the form of rows and columns. The relations among tables are also stored in the form of the table.

Features:
- Provides data to be stored in tables
- Persists data in the form of rows and columns
- Provides facility primary key, to uniquely identify the rows
- Creates indexes for quicker data retrieval
- Provides a virtual table creation in which sensitive data can be stored and simplified query can be applied.(views)
- Sharing a common column in two or more tables(primary key and foreign key)
- Provides multi user accessibility that can be controlled by individual users

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