What was the main disadvantage of vacuum tubes?
They were larger in size
They consumed a lot of electricity
They produced heat and often burned out
The operation cost was high
Correct Answer :
C. They produced heat and often burned out
Related Questions
Which of the following is not an input device?
OCR
Optical scanners
COM (Computer Output to Microfilm)
Voice recognition device
Who is credited with the idea of using punch cards to control patterns in a waving machine?
Pascal
Hollerith
Babbage
Jacquard
Which of the following is not purely output device?
Screen
Printer
Speaker
Plotter
The first machine to successfully perform a long series of arithmetic and logical operations was:
ENIAC
Mark-I
Analytic Engine
UNIVAC-1
A technique used by codes to convert an analog signal into a digital bit stream is known as
Pulse code modulation
Pulse stretcher
Query processing
Queue management
As compared to diskettes, the hard disks are
More expensive
More portable
Less rigid
Slowly accessed
________ are used for plotting graphs and design on papers
Trackball
Joystick
Light pen
Plotters
CAD stands for
Computer aided design
Computer algorithm for design
Computer application in design
All of the above
The computer that can input analog signals and return result in digital form
Analog Computers
Digital Computers
Hybrid Computers
Mainframe Computers
A kind of scanner MICR is the short form of
Magnetic Ink Character Reader
Magnetic Ink Code Reader
Magnetic Ink Cases Reader
None
Web cam is an
input unit device
output unit device
processing device
Input and Output device
Bit map terminal
support display containing multiple windows
require considerable amount of video RAM
requires tremendous amount of copying and hence low performance
all of above
What do you call a single point on a computer screen?
Cell
Element
Pixel
Bit
which of the following is problem oriented language?
High level language
Machine language
Assembly language
Low level language
A computer assisted method for the recording and analyzing of existing or hypothetical systems is
Data transmission
Data flow
Data capture
Data processing
Which of the following devices can be sued to directly image printed text?
OCR
OMR
MICR
All of above
________ Computers are of large size
Micro
Mainframe
Super
Mini
To prevent the loss of data during power failures, use a(n):
Encryption program.
Surge protector.
Firewall.
UPS.
A program component that allows structuring of a program in an unusual way is known as
Correlation
Coroutine
Diagonalization
Quene
You use a(n) ________, such as a keyboard or mouse, to input information
output device
input device
storage device
processing device
Which of the following is not a class based on size?
Mainframe Computer
Micro Computer
Mini Computer
Digital Computer
Which method is used to connect a remote computer?
Device
Dialup
Diagnostic
Logic circuit
When was the world's first laptop computer introduced in the market and by whom?
Hewlett-Packard, 1980
Epson, 1981
Laplink Traveling Software Inc, 1982
Tandy Model-200, 1985
Who invented EDSAC?
John v. Neumann
J.P. Eckert and John Mauchley
Maurice Wilkes
Howard Aiken
Which is the first electronic digital computer?
ENIAC
MARK I
Z3
ABC
Which statement is valid about computer program?
High level languages must be converted into machine language to execute
High level language programs are more efficient and faster to execute
It is more difficult to identify errors in high level language program than in low level programs
All of above
The qualitative or quantitative attribute of a variable or set of variables is termed as
data
information
both of above
none of above
Which of the following are input devices?
Keyboard
Mouse
Card reader
Any of these
Word length of a Personal Computer is
4 bits
8 bits
16 bits
64 bits
The output quality of a printer is measured by
Dots per inch
Dot per sq. inch
Dots printed per unit time
All of above