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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 Questions and Answers - 1

1) What do you mean by platform independent in java?
          Platform independence means that you can run the same java program in any Operating system. For example, you can write java program in window and run it in Mac OS.

2) What is JVM and is it platform independent ?
          Java virtual machine (JVM) is the heart of java programming language. JVM is responsible for converting byte code into machine readable code. JVM is not platform independent, that's why you have different JVM for different operating system. We can customize JVM with java options, such as minimum and maximum memory to JVM. It is called virtual because it provides an interface that doesn't depend on the underlying OS.

3) Java compiler is stored in JDK, JRE or JVM ?
          The task of java compiler is to convert java program into byte code, we have javac executeable for that. So it must be stored in JDK, we don't need it in JRE and JVM is just the specs.

4) Which class is the superclass of all the classes?
          java.lang.Object is the root class for all the java classes and we don't need to extend it.

5) Why java is not Object Oriented Programming language?
          Java is not a pure OOP language due to two reasons:
The first reason is that the object oriented programming language should only have objects whereas java contains 8 primitives data types like char, boolean, byte, short, int, long, float, double which are not objects. These primitive data types can be used without the use of any object.

The second reason related to the static keyword. In pure object oriented language, we should access everything by message passing(through objects). But java contains static variables and methods which can be accessed directly without using objects. That means, when we declare a class as 'static' then it can be referenced without the use of an object.
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