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(b) Some applications of AI are:
(i) Gaming
(ii) Vision Systems
(iii) Expert Systems
(iv) Speech Recognition

23. What are the different types of printers? (2)
Ans. The different types of printers include:
(a) Dot Matrix Printer: It is also known as serial printer and prints one character at a time. It uses
dots to create an image. It has a low operating cost and can also be used to generate carbon
copies.
(b) Inkjet Printer: It is the most common type of low-cost printer. It uses the technique of spreading
quick-dry ink on paper and generates high-quality prints. It is ideal for small offices and homes.
(c) Laser Printer: It uses laser technology to produce printed documents. It uses a dry form of ink,
i.e., toner, which is made up of fine dry powder typically made from granulated plastics, carbon
black, and other colouring agents. It generates high-quality prints.
24. What is NumPy? (2)
Ans. NumPy refers to Numerical Python. It is a core library offered by Python for data analysis. It is also used
for scientific computing applications. It provides functions for fast mathematical computation on arrays
and matrices.
25. (a) Define the term Virtual Reality (VR). (2)
OR
(b) What are tokens in Python? Name them.
Ans. (a) Virtual Reality (VR) is the use of computer technology to create an immersive virtual environment,
separate from the real world. Instead of simply viewing a screen in front of them, users are fully
immersed in a 3D world and are able to interact with it.
OR
(b) A token is the smallest individual unit of a Python program, which is meaningful to the Interpreter.
The categories of tokens are as follows:
(i) Keywords
(ii) Identifiers
(iii) Literals/Constants
(iv) Operators
(v) Punctuators
26. How can you identify the data type of a variable in Python? Give examples. (2)
Ans. We can identify the data type of a variable with the help of type() function in Python.
For example,
print(type(12))
<class 'int'>
print(type(False))
<class 'bool'>
27. What are the advantages of relational model? (2)
Ans. The advantages of relational model are:
(a) It provides structural independence by using independent tables.
(b) It is represented in the form of tables.
(c) It is simple and easy to understand.
(d) Data organization and manipulation is easy, flexible and faster.

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