Federal Board Class IX Computer Science

SECTION “A”

Q.1. Insert the correct option i.e. A/B/C/D in the empty box provided opposite each part. Each part carries one mark.

i. Which year was the Transistor invented?

• 1943
• 1948
• 1950
• 1952

ii. What is the called the brain of computer?

• CPU
• CU
• ALU
• ROM

iii. A 16 bit ADDRESS BUS can address ________ of memory

• 256 bytes
• 8 bytes
• 256 bits
• 64 bytes

iv. How many colours doe an EGA monitor Produce?

• 4
• 16
• 64
• 256

v. Which of the following is used to produce Soft Copy?

• Laser Printer
• Plotter
• CD-Writer
• Dot-Matrix Printer

vi. Hard Disk is also known as ________.

• Compact Disk
• Winchester Disk
• System Disk
• Changeable Disk

vii. In Computer, data/instruction flow in groups of bits called _______.

• Bytes
• Nibbles
• Words
• Bits

viii. What types of Software is interpreter?

• System Software
• Service Software
• Utility Software
• Application Software

ix. Which of the following is a DOS internal command?

• ERASE
• EDIT
• DELTREE
• SYS

x. A Text Box is a type of ________.

• Command Box
• Menu Box
• List Box
• Dialog Box

xi. Which of the following is used to change the system defaults or properties of a computer?

• Control Box
• Control Panel
• Control Unit
• Central Processing Unit

xii. At what interval does MS Word automatically save documents by default?

• 5 Minutes
• 10 Minutes
• 15 Minutes
• 30 Minutes

SECTION “B”

Q.2. Attempt any NINE parts. The answer to each part should not exceed 3 to 4 lines each. (27)

i. List any three uses of a Super Computer.

ii. Why are Machine and Assembly Languages called low level languages?

iii. Draw the diagram of the Analytical Engine.

iv. What is the difference between Standard Toolbar and Formating Toolbar?

v. What is the difference between Character Formatting and Paragraph Formatting.

vi. What is the difference between DOS internal and DOS external commands?

vii. What is a Computer Virus? How can Computer Virus be checked in Disks?

viii. Write briefly about the following

a. The Desktop
b. My Computer
c. Recycle Bin

ix. Write briefly about the following DOS internal Commands

a. DATE
b. COPY
c. DIR

x. Differentiate between RAM and ROM

xi. Differentiate between CD ROM and Hard Disk.

xii. What is a Plotter? How does it work?

xiii. Draw Block Diagram of a Computer system with sub-units of CPU.

SECTION “C”

NOTE: Attempt any TWO questions, Each question carries equal marks. (16)

Q.3. (a) What is Internet? Describe its importance in society.
Q.3. (b) What is a Compiler? How does it differ from an interpreter?

Q.4. (a) Write functions of Ports in Computer. What is difference between Serial Port and Parallel Port?
Q.4. (b) Describe the functions of input devices in a computer. Briefly write about keyboard and electric light pen.

Q.5. (a) What is the significance of Bytes? Explain the relation of other Memory Units with Bytes?
Q.5. (b) What is an Operating System? Describe various classifications of operating systems with the help of examples.