Interview Questions

Q:

Difference between system call and API

Answer

A system call is a function.subroutine which interrupts the currently executing program and transfers control to the interrupt routine.The contents of the executing program are saved and after the interrupt routine finishes its function,control is transferred back to the executing program. If we talk in the context of Linux then System calls are called kernel mode.


Whereas API (Application Programming Interface) is a function or a set of functions, objects, protocols or data-structures for the support of application development for developers/programmers. It is actually a kind of function definition which specifies how to make available of a specific service of the system/OS to the other program/process or system. Read more at: https://www.queryhome.com/48442/os-what-is-difference-between-system-call-and-api

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Q:

Text/Html is called the __________ of the page

A) content type B) MIME type
C) content type/MIME type D) None of these
 
Answer & Explanation Answer: C) content type/MIME type

Explanation:
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Filed Under: Web Technology

3 7115
Q:

The correct statement for a function that takes pointer to a float, a pointer to a pointer to a char and returns a pointer to a pointer to a integer is

A) int **fun(float**, char**) B) int *fun(float*, char*)
C) int ***fun(float*, char**) D) int ***fun(*float, **char)
 
Answer & Explanation Answer: C) int ***fun(float*, char**)

Explanation:
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Filed Under: C++

3 7106
Q:

Explain derivatives in terms of capital markets ?

Answer

The term derivative indicates that it has no independent value that is its value is entirely derived from the values of the underlying assets. The underlying asset can be securities, commodities , bullion, currency, livestock or anything else.

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Subject: Finance

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Q:

Which of the following are incorrect form of StringBuffer class constructor  ?

A) StringBuffer(int size , String str) B) StringBuffer(int size)
C) StringBuffer(String str) D) StringBuffer()
 
Answer & Explanation Answer: A) StringBuffer(int size , String str)

Explanation:
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Filed Under: Java
Job Role: Database Administration , IT Trainer

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Q:

What is the meaning of VSAM RETURN-CODE 28?

Answer

Out of space condition is raised.

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Q:

What are the restriction imposed on a static method or a static block of code?

Answer A static method should not refer to instance variables without creating an instance and cannot use "this" operator to refer the instance.
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Subject: Java

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Q:

Which two method you need to implement for key Object in HashMap ?

Answer

In order to use any object as Key in HashMap, it must implements equals and hashcode method in Java.

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