1. Answer Briefly:
(1)What is a computer?
Ans. Computer is an
electronic machine. It can store large amount of data in its memory. It can
process the same data to give desired output according to the instructions.
(2) Write any three features of computer.
Ans. A computer can
calculate at high speed. Computer gives accurate results as long as it receives
correct data and instruction and computer has large memory son it can store a
large amount of data.
(3) Draw and explain the block the block diagram of a
computer.
Ans:
(1) Input device : A device through
which data is entered is called an input device.
(2) Central Processing Unit(CPU): It is made up
of three parts:
(a) ALU (Arithmetic and Logic Unit): All the
arithmetic operations and logical operations are done here.
(b) CU (Control Unit) : This unit regulates and
manages the whole computer system.
(c) Memory Unit: The information is temporarily
stored in this unit.
(3) Output device : The processed data is displayed
on an output device.
(4)Write a short note on mouse.
Ans. The mouse is a
small but a very important input device designed to fit into one’s cupped palm.
It is used to point at a graphical object on the monitor screen.
(5) Explain any three uses of computer.
Ans. Computers in
entertainment: You can use a computer to play games, listen to music and songs,
watch movies etc.
Computers in weather
forecasting: Computers are used to record and forecast the day and night
temperatures as well as rainfall.
Computers in research:
Computers are used for scientific research. They are also used to design new
machines and applications.
(6) Write the
limitations of a computer.
Ans. The limitations of
computers are: (1) A computer lacks intelligence and works only on
instructions.(2) A computer has no feelings ort emotions and hence cannot be
creative like human.
2.Answer in one
sentence.
(1) What is an
input device?
Ans. A device through
which data is entered is called input device.
(2) What is an
output device?
Ans. The processed data
is displayed on an output device.
(3) Name the
different parts of CPU.
Ans. ALU (Arithmetic
and Logic Unit): All the arithmetic operations as well as logical operations
are doing here.CU (Control Unit) : This unit regulates and manages the whole
computer system. Memory Unit: The information is temporarily stored in this
unit.
(4) What is the
use of a scanner?
Ans. A scanner allows
you to capture documents that are printed on paper and turn into digital format
to be viewed on a computer.
(5) What is a
barcode reader?
Ans. A barcode reader
can read the black and white parallel lines on a product contains coded
information about the product.
(6) What is the
use speaker in a computer system?
Ans. The recorded sound
stored in the computer can be paly back through speakers.
3.Name the following.
(1) The person who uses a computer.
Ans. User
(2) A unit of CPU where arithmetic and logical operations
are done.
Ans. Arithmetical and
Logic Unit
(3) An exclusive
set of keys for numbers and arithmetic operators.
Ans. Numeric key pad.
(4) The output
device looks like a TV screen.
Ans. Monitor.
4.Name any two.
(1) Storage device.
Ans. Hard disk and
Compact Disk
(2) Input Devices.
Ans. Keyboard and
Mouse.
(3) Output device.
Ans. Monitor and
Printer
(4)Types of computer.
Ans. Laptop Computer,
Desktop Computer.
5.What is the function
of the following keys.
(1) Spacebar.
Ans. This is the
largest key on the keyboard and is used to insert blank spaces between two
characters or words.
(2) Enter key
Ans. The enter key is
used to move the cursor to the next line. It is also used to tell the computer
to carry out the typed instruction.
(3) Arrow keys.
Ans. The four arrow or
cursor keys (up, down, left, right) can be pressed to move the cursor in these
directions.
(4) Escape key
Ans. Escape key is used to tell the computer to
abort or stop processing an instruction.
6. Distinguish
between:
|
Primary Memory
|
Secondary
Memory
|
|
1.This memory temporarily hold data and
transactions
|
1. This memory permanently stores important
instructions.
|
|
2. When the computer is switched off,
everything in this memory gets erased.
|
2.When the computer is switched off the data in the
memory will not be erased
|
7. Fill in the blanks:
(1)Scanner is an input
device.
(2)The Control unit regulates and manages the whole
computer system.
(3)The coded black and white parallel lines on a product
label is read by Barcode reader and sent to the computer.
(4) Hard disk is a secondary memory.
(5) The rapidly click the left mouse button twice is
called Double Click.
8. Arrange the
following device as input or output:
(a) Mouse
(b) Monitor
(c )Keyboard
(d) Speaker
(e)Scanner
(f) Microphone
|
Input Device
|
Output Device
|
|
a.Mouse
|
a.Monitor
|
|
b. Keyboard
|
b.Speaker
|
|
c. Scanner
|
c.Printer
|
|
d. Microphone
|
|
|
9.Match the following.
|
|
|
Input Unit
|
Keyboard
|
|
Output Unit
|
Monitor
|
|
CPU
|
ALU
|
|
|
|