Class-6
Subject: Computer Science
Chapter- 1 Know About the Computer (Solved Exercise)
A. Name the following:
1.
Two input devices
________________________
____________________
Answer:
Keyboard and Mouse
2. Two
types of printers _____________________ ____________________
Answer:
Impact and non-impact printer
3. Component
of CPU _____________________
____________________
Answer:
ALU and Memory
4. Two
types of monitor ____________________ ____________________
Answer:
CRT and LED
5. Two
types of primary memory _____________ ____________________
Answer:
RAM and ROM
B. Fill in the blanks:
1.
__________ represents product
information such as _________ and ___________.
Answer:
Barcode, price and place.
2. __________
creates digital image of hand written text.
Answer:
OCR
3. __________
ink contains particles of ___________oxide.
Answer:
Special, Iron
4. __________
printer uses ____________ beam and dry ink.
Answer:
Laser, laser
5. __________,__________,__________
and __________ are logic instructions.
Answer:
AND, OR, NOT, XOR
C. Write true or
false.
1.
Secondary memory is directly
accessed by the CPU. __________ F
2.
Output on the monitor is called
the soft copy. _______________ T
3.
Printer gives hard copy.
________________________________ T
4.
Primary memory is non-volatile.
_________________________ F
5.
Computer reduces paper work.
__________________________. T
D. Write the full form
of the following:
1.
OCR______________________________________.
Answer:
Optical Character Recognition
2. OMR_____________________________________.
Answer:
Optical Mark Reader or recognition
3. MICR_____________________________________.
Answer:
Magnetic Ink Character Recognition
4. CPU______________________________________.
Answer:
Central Processing Unit
5. ALU______________________________________.
Answer:
Arithmetic Logical Unit
E. Answer the
following questions.
1. Differentiate
between OMR, OCR and MICR.
Answer:
OMR:
Optical Mark Reader is a input device that reads OMR sheets used in objective
type exams.
OCR:
Optical Character Reader takes normal printed or hand written text
as input. It creates a digital image of the text.
MICR:
Magnetic Ink is a special ink that contains particles of iron oxide.
2.
Write a note on CPU.
Answer:
The Central Processing Unit (CPU) is the brain of a computer where the
processing of input data is done. The CPU consists of two components.
ü Arithmetic Logical Unit (ALU)
ü Control Unit (CU)
3. Diagrammatically
explain the organization of computer components.
Answer: A computer consists of five
functionally independent main parts- input units, memory units, arithmetic logic
unit, output unit and control unit.
4.
How is primary memory different from secondary memory?
Answer:
Primary
Memory:
ü Primary
memory is also called main memory.
ü This
memory is directly accessed by the CPU.
ü Primary
memory is divided into two types- RAM and ROM.
ü RAM
is a volatile memory.
Secondary
Memory:
ü It
is also called permanent memory.
ü It
is non-volatile memory.
ü It
is used to store large amount of data.
5. Write short notes
on the following.
a. Printer and its
types.
b. Barcode reader.
c. Applications and
advantages of a computer.
Answer:
(a) Printer: Printer prints the output on the paper. The
printed copy is called the hard copy.
Dot
Matrix Printer: It works very similar to
typewriter and creates the impression by striking on the paper.
Inkjet
Printer: An Inkjet printer produces hard copy by
spraying ink on to the paper.
Laser
Printer: The laser printer uses laser beam and dry
ink to produce hard copy.
(b):
Barcode Reader: A barcode is a computer coding
system. It represents product information such as price and place of
manufacture.
(C)
Application of computer:
ü Computers
are used at home.
ü Computers
are used in schools.
ü Computers
are used in offices to maintain employee records.
ü Computers
are used in library.
Advantages of computer:
ü It
store large amount of data.
ü It
performs tasks at a high speed.
ü It
performs calculations quickly and accurately.
ü It
reduces the paper work.
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