Information Technology Mixed Test - 3

Final is a keyword which is used in three cases: (1) a final class means you cannot extend the class, i.e. you can't make a subclass, (2) a final method means you can not override the method, (3) a final variable means you cannot change it's value.

It holds 8 bytes(64-bits) memory to store a value of a variable. Its range is from -1.79769313486232E308 to -45841247E-324 for negative values and 4.94065645841247E-324 to 1.79769313486232E308 for positive values.

 Protected is an access specifier.It allows subclasses to inherit the protected thing, even if those classes are outside the package of the super class they extend means a protected class can be inherited outside the package(another package). Protected access specifier is used with finalize method for garbage collection when an object is being garbage collected, the garbage collector will call a special method called finalize in the object. It is also used for cleanup code and to avoid circular references.

This is the char type, which holds representations of characters such as letters and numbers. The char data type holds 2 byte(16-bits), its range is 0 to 65535, for example: char i ='j'; i is a variable of char type declare and assign it the value 'j'.

It covers area larger than LAN but smaller than WAN covering an area of 2 to 100 km. Therefore, MAN allows the sharing of resources within a city.

All of  the above options are correct.
Print is a method. Methods have bodies, return types and they can take different types of arguments. Print function is defined in the System class.

Object is the class and this class is the mother of all classes. Every class in java extends class Object, means the superclass of everything. Any class that does not explicitly extends another class implicitly extends object class. For example: public class lion extends Object {} class lion, which extends class Object explicitly, public class dog {},in this example class dog extends class Object implicitly.

Each device is connected point-to- point to central device which is called hub. Hub manages and controls all the functions of the network. It also acts a multiport repeater for the data flow.

 All the above options are correct.

L2 cache is referred to the cache which is located outside the processor. Therefore, its size can exceed from L1 cache located inside the processor.

Backbone provider is an organization that supplies access to high speed transmission lines which connect users to the internet.

 It is an access modifier: private means that only code within same class can access the private data members.To encapsulate the data or hide  the data we use private instance variable and provide public getter and setter methods. For example: class dog { private int size; public int getSize(){ return size;} public void set Size(int s ){size =s; }}, mark the instance variable(size) private and make the getter(getSize()) and setter(setSize()) methods public.

Because there is four pin USB port in the system and the cable end A also have four pin connector.

It is easy to install, configure and manage and also easy to detect a faulty device.

This is correct, because the size of single-sided, single-layered DVD is 4.7 GB. Therefore,  the size of this DVD will be just double of it.

Here each device is connected to each other. Data sent by the device can take any possible path to reach the destination. In mesh topology, each device is connected directly to each other.

B2B refers to Business-to-Business in which a business firm makes transactions with other business firms.

 IRQ 1 enables keyboard to communicate with the microprocessor. If we assign the same IRQ to two devices, this will result in an IRQ conflict and the system or the device may malfunction.

The data unit of the layer known as segment has the functions; segmentation and re-assembly, connection control, flow control and error control.

CMOS battery is installed on the motherboard because there is a particular socket made for on-the-motherboard, which helps in showing the date and time on the system.