Skip to main content

Quiz based on Digital Principles and Computer Organization

1) Base of hexadecimal number system? Answer : 16 2) Universal gate in digital logic? Answer : NAND 3) Memory type that is non-volatile? Answer : ROM 4) Basic building block of digital circuits? Answer : Gate 5) Device used for data storage in sequential circuits? Answer : Flip-flop 6) Architecture with shared memory for instructions and data? Answer : von Neumann 7) The smallest unit of data in computing? Answer : Bit 8) Unit that performs arithmetic operations in a CPU? Answer : ALU 9) Memory faster than main memory but smaller in size? Answer : Cache 10) System cycle that includes fetch, decode, and execute? Answer : Instruction 11) Type of circuit where output depends on present input only? Answer : Combinational 12) The binary equivalent of decimal 10? Answer : 1010 13) Memory used for high-speed temporary storage in a CPU? Answer : Register 14) Method of representing negative numbers in binary? Answer : Two's complement 15) Gate that inverts its input signal? Answer : NOT 16)...

Java Important Questions - 2

1) Does Java uses pointers?
         No, java doesn't use Pointers. Carelessness in their use may result in memory problems. Also it has tough security. Instead of Pointers, reference are used in java as they are safer and more secure when compared to a Pointer.

2) How are Destructors defined in java?
          Since, java has it's own garbage collection, no destructors are required to be defined. Destruction of objects is automatically carried by the garbage collection mechanism.

3) What is the difference between path and classpath variable?
          PATH is an environment variable used by operating system to locate the executables. Once you installed java on your machine, it is required to set the PATH environment variable to run conveniently run the executables (javac.exe, java.exe, javadoc.exe,and so on) from any directory without having to type the full path of the command,such as:
c:\javac Testclass.java
Otherwise, you need to specify the full path every time you run it, such as:
c:\java\jdk1.7.0\bin\javac TestClass.java
Classpath is specified to java and used by java executables to locate class files. We can provide the classpath location while running java application and it can be a directory, ZIP files, JAR files etc.

4) Can we overload main method ?
          Yes, we can have multiple methods with name 'main' in a single class. However if we run the class, java runtime environment will look for main method with syntax as
public static void main(String args[])

5) Can we execute any code, even before the main method?
          Yes, we can execute any code, even before the main method. We are using a static block of code in the class when creating the objects at load time of class. Any statements within the static block of code will get executed one time while loading the class, even before the creation of objects in the main methods.
Labels:

Popular posts from this blog

Human Factors in Designing User-Centric Engineering Solutions

Human factors play a pivotal role in the design and development of user-centric engineering solutions. The integration of human-centered design principles ensures that technology not only meets functional requirements but also aligns seamlessly with users' needs, abilities, and preferences. This approach recognizes the diversity among users and aims to create products and systems that are intuitive, efficient, and enjoyable to use. In this exploration, we will delve into the key aspects of human factors in designing user-centric engineering solutions, examining the importance of user research, usability, accessibility, and the overall user experience. User Research: Unveiling User Needs and Behaviors At the core of human-centered design lies comprehensive user research. Understanding the target audience is fundamental to creating solutions that resonate with users. This involves studying user needs, behaviors, and preferences through various methodologies such as surveys, interview...
Read more

Introduction to C Programs

INTRODUCTION The programming language ‘C’ was developed by Dennis Ritchie in the early 1970s at Bell Laboratories. Although C was first developed for writing system software, today it has become such a famous language that a various of software programs are written using this language. The main advantage of using C for programming is that it can be easily used on different types of computers. Many other programming languages such as C++ and Java are also based on C which means that you will be able to learn them easily in the future. Today, C is mostly used with the UNIX operating system. Structure of a C program A C program contains one or more functions, where a function is defined as a group of statements that perform a well-defined task.The program defines the structure of a C program. The statements in a function are written in a logical series to perform a particular task. The most important function is the main() function and is a part of every C program. Rather, the execution o...
Read more

Performance

Performance ( Optional ) * The I/O system is a main factor in overall system performance, and can place heavy loads on other main components of the system ( interrupt handling, process switching, bus contention, memory access and CPU load for device drivers just to name a few. ) * Interrupt handling can be relatively costly ( slow ), which causes programmed I/O to be faster than interrupt driven I/O when the time spent busy waiting is not excessive. * Network traffic can also loads a heavy load on the system. Consider for example the sequence of events that occur when a single character is typed in a telnet session, as shown in figure( And the fact that a similar group of events must happen in reverse to echo back the character that was typed. ) Sun uses in-kernel threads for the telnet daemon, improving the supportable number of simultaneous telnet sessions from the hundreds to the thousands.   fig: Intercomputer communications. * Rather systems use front-end processor...
Read more