Question Discussion & Solution

Inheritance

The capability of a class to derive properties from another class is called Inheritance

• The class that inherits properties from another class is called Subclass or Derived Class.
• The class whose properties are inherited by a subclass is called Base Class or Superclass.

Syntax for Inheritance

class derived_name : access_mode base_class

{

//body of derived class

};

Additional Information 

Polymorphism

Polymorphism is mainly divided into two types:

• Compile-time Polymorphism
• Runtime Polymorphism

Compile-time polymorphism

This is achieved by function overloading or operator overloading.

• Function Overloading - When there are multiple functions with the same name but different parameters then these functions are said to be overloaded
• Operator overloading - When there are multiple operations can be performed by using single operator is called operator overloading for example operator ‘+’ when placed between integer operands, adds them and when placed between string operands, concatenates them

Run Time Polymorphism

It is achieved by Function Overriding.

Conclusion

Feature of Reusability is followed by inheritance so the correct answer is the inheritance.

The correct answer is CPU.

Key Points

• CPU (Central Processing Unit) -
  • It is the main part of the computer, it can also be called the 'brain of the computer'.
  • Its function is to process the inputs and instructions coming on the computer. 
  • This unit of computer performs arithmetic, logical, control functions, input functions, and output functions. 
  • It is also commonly known as a processor.

Additional Information

• Motherboard -
  • It is a printed circuit board installed in most electronic plants such as laptops, computers, etc.
  • It is also called the mainboard or system board.
  • The main part of the motherboard is its chipset.
• RAM (Random Access Memory) -
  • This is a type of memory, we also know it by the name of Primary Memory.
  • There are two types of RAM. Static RAM and Dynamic RAM

The correct answer is Fermentation. Key Points

• The name of the process which converts milk into curd is lactic fermentation and in this process, the lactose sugar of the milk is converted into lactic acid by lactic acid bacteria.
• The acid thus produced curdles the milk and gives it a sour taste.
• During the fermentation process, lactose fermenting bacteria utilize lactose of milk to gain energy.
• Fermentation is an enzyme-catalyzed, the metabolic process whereby organisms convert starch or sugar to alcohol or an acid anaerobically releasing energy.
• The science of fermentation is called “zymology”.
• Types of Fermentation
  • ​Homo fermentation: only one type of product formation
  • Hetero fermentation: more than one product formed
• Examples of Products Formed by Fermentation
  • ​Beer, Wine, Yogurt, Cheese, Certain sour foods containing lactic acid, including sauerkraut, kimchi, and pepperoni.
  • Bread leavening by yeast.
  • Sewage treatment.
  • Some industrial alcohol production

Additional Information

The correct answer is Desktop.

• The first screen which appears when windows are loaded is called Desktop.

Key Points 

• Desktop
  • The first screen which appears when windows are loaded is called Desktop.
  • As soon as we open the computer we come across the Windows welcome screen which displays many small pictures on the screen of the monitor.
    • This screen is known as the desktop.
  • The small pictures on the screen are known as icons.

Additional Information

• File Folder
  • ​A file is the common storage unit in a computer, and all programs and data are "written" into a file and "read" from a file.
  • A folder holds one or more files, and a folder can be empty until it is filled. 
• Recycling Bin
  • ​A recycling bin (or recycle bin) is a container used to hold recyclables before they are taken to recycling centers. 
  • Recycling bins exist in various sizes for use inside and outside homes, offices, and large public facilities.
• Recently Added Screen
  • ​A typical “Recently Added” section looks like at the top of the Start menu app list.
  • It's a small area that shows the names and icons of recently installed apps.

The correct answer is Scanner.

Key Points

• Scanner:
  • Scanner is an input device and can be used to scan images as well as text documents.
  • Scanner is not a pointing input device.
• ​Pointing device
  • A pointing device is an input interface that allows a user to input spatial data to a computer. 
  • Common pointing devices
    • Mouse
    • Trackball
    • Joystick
    • Pointing stick
    • Wii Remote
    • Finger tracking
    • Graphics tablet
    • Stylus
    • Finger tracking

Additional Information

• Track Ball:
  • The trackball is a pointing device consisting of a ball housed in a socket containing sensors to detect rotation of the ball about two axes, similar to an upside-down mouse..
  • Tracker balls are commonly used on CAD workstations​
• Digitizing Tablet:
  • A digitizer tablet is a peripheral device that allows users to draw on a computer screen.
• Joystick:
  • A joystick is a lever-type device that can be moved in several directions.
  • Used to control the movement of an image on a computer or similar display screen.