8th Class Computers Science IT Basics Types of Computer          

   Types of Computer

There are three types of computer including digital computers/analog computers and hybrid computers.  

  Digital Computer

The digital computer stores data, such as text and picture in the form of numbers and proceed in discrete steps from one state to the next. The state of a digital computer involves binary (Os and Is) digit. All operations are carried out on those digits at extremely fast rates. Digital computer can be further classified in the purpose wise and size and performance wise.  

  Analog Computer

Analog computers use continuous physical properties for calculations. An analog magnetic tape, for example, manipulates magnetism to record sound. The magnetic imprint on the tape is a direct analog of the sound, and is read back by a reader. An analog computer uses physical properties in the same way. Analog computers have been built using mechanical, hydraulic, optical and electric principles.  

 Hybrid Computers

The hybrid computers combine the best quantities of both analog and digital computers. These types of computers operate by measuring rather than by calculating. It works with analog or continuous values. Computations are carried out with physical quantities such as temperature, length and voltage. These types of computers are used for measurement of patient's blood pressure, heart beat and the operation is carried out in digital to monitor patient's initial sign.  

  Which of the following statements is true about microcomputer?  

(A) Microcomputer is faster than minicomputers

(B) Microcomputer is a computer whose CPU (Central Processing Unit) is a microprocessor

(C) Microcomputer can be categorized as desktop, workstation and programmable

(D) (B) and (C) are true (E) None of these  

Answer: (D)

Explanation

Correct Option:

(D) The options (B) and (C) are true

Incorrect Option:

Rests of the options are invalid.    

 Computers are of three types: digital computers, analog computers and hybrid computers. Which one of the following types of computer is used for measurement of patient's blood pressure?

(A) Digital                                                           

(B) Analog

(C) Hybrid                                           

(D) All of these

(E) None of these  

Answer: (c)

Explanation

Correct Option:

(C) The hybrid computers are used for measurement of patient's blood pressure

Incorrect Option:

Rests of the options are invalid.  

  The precision of analog computers is limited to................

(A) One                                                              

(B) Two

(C) Three                                                            

(D) Five

(E) None of these  

Answer : (c)

Explanation

Correct Option:

(C) The precision of analog computers is limited to three, or at most, four digits of precision.

Incorrect Option:

Rests of the options are invalid.