Sample Questions

Q1. Write base values of binary, octal and hexadecimal number system.

Ans. 

Base value of binary – 2

Base value of Octal – 8

Base value of Hexadecimal – 16

Q2. Give full form of ASCII and ISCII.

Ans. Full forms are :

ASCII : American Standard Code for Information Interchange

ISCII : Indian Script Code for Information Interchange

Q3. Try the following conversions. (Number after bracket is showing the base)

(i) (514)8 = (?)10       (ii) (220)8 = (?)2      (iii) (76F)16 = (?)10

(iv) (4D9)16 = (?)10          (v) (11001010)2 = (?)10      (vi) (1010111)2 = (?)10

Ans.

 i) (514)8 = (332)10

ii) (220)8 = (10010000)2

iii) (76F)16 = (1903)10

iv) (4D9)16 = (1241)10

v) (11001010)2 = (202)10

vi) (1010111)2 = (87)10

Q4. Express the following octal numbers into their equivalent decimal numbers.

(i) 145      (ii) 6760   (iii) 455   (iv) 10.75 

Ans. 

(i) (145)8 = (101)10

(ii) (6760)8 = (3568)10

(iii) (455)8 = (301)10

(iv) (10.75)8 = (8.953125)10

Q5. Write binary representation of the following hexadecimal numbers.

(i) 4026   (ii) BCA1     (iii) 98E  (iv) 132.45

Ans. (i) (4026)16 = (100000000100110)2

(ii) (BCA1)16 = (1011110010100001)2

(iii) (98E)16 = (100110001110)2

(iv) (132.45)16 = (100110010.010001012)

Q6. Write binary equivalent of the following octal numbers.

(i) 2306  (ii) 5610    (iii) 742   (iv) 65.203

Ans.

(i) (2306)8 = (10011000110)2

(ii) (5610)8 = (101110001000)2

(iii) (742)8 = (111100010)2

(iv) (65.203)8 = (110101.010000011)2

Q6. Convert the following binary numbers into octal and hexadecimal numbers.

(i) 1110001000   (ii) 110110101   (iii) 1010100   (iv) 1010.1001

Ans.

 (i) (1110001000)2 = (1610)8 = (388)16

(ii) (110110101)2 = (665)8 = (1B5)16

(iii) (1010100)2 = (124)8 = (54)16

(iv) (1010.1001)2 = (12.44)8 = (A.9)16

Q7. Express the following decimal numbers into hexadecimal numbers.

(i) 548  (ii) 4052   (iii) 58   (iv) 100.25

Ans. (548)10 = (224)16

(ii) (4052)10 = (FD4)16

(iii) (58)10 = (3A)16

(iv) (100.25)10 = (64.4)16

Q7. The hexadecimal number system uses 16 literals(0–9, A–F). Write down its base value.

Ans. 16

Q8. What is the need of RAM? How does it differ from ROM?

Ans. RAM is used to store data temporarily while the computer is working. Whenever the computer is started or a software application is launched, the required program and data are loaded into RAM for processing. 

ROM is a primary memory of the computer that stores those computer instructions and programs that do not need to be altered in future like BIOS (Basic Input/output System )

Q9. How does the computer understand a program written in high level language?

Ans. Humans are able to write programs in high-level language while computers can understand only machine language. so with the help of language translators (Compiler or Interpreter) programs written in HLL can be converted into machine language which is understood by computer.

Q10. Why is the execution time of the machine code less than that of source code?

Ans. The program code written in assembly or high-level language is called source code. This source code is converted into machine understandable form called machine (object) code, So the execution time of machine code is less than that of source code.

Q11. What is the need for secondary memory?

Ans. The secondary memory (also called storage device) is required to store data, instructions and results permanently for future use.

Q12. What is the primary role of system bus? Why is data bus is bidirectional while address bus is unidirectional?

Ans. 

The System bus or bus provides a communication path between the major components of the Computer system.

Data bus is bidirectional as the CPU may require to read data from main memory or write data to main memory, while Address bus is unidirectional because the CPU is addressing a specific memory location either for reading or writing.

Q13. Name the input or output device used to do the following:

a) To output audio

b) To enter textual data

c) To make hard copy of a text file

d) To display the data or information

e) To enter audio-based command

f) To build 3D models

g) To assist a visually-impaired individual in entering data

Ans.

a) To output audio : Speaker

b) To enter textual data : Keyboard

c) To make hard copy of a text file : Printer

d) To display the data or information : Monitor

e) To enter audio-based command : Microphone

f) To build 3D models : 3D Printer

g) To assist a visually-impaired individual in entering data : Braille keyboards

Q14. Identify the category (system, application, programming tool) of the following software:

a) Compiler

b) Assembler

c) Ubuntu

d) Text editor

Ans. a) Compiler : System Software

b) Assembler : System Software

c) Ubuntu : System Software

d) Text Editor : Programming Tool

What do you mean by memory devices? Explain RAM and ROM. [2]

Difference between data and information ?

How many Bytes in 1 TB ?

How many bits in 1 TB  ?

How many MB in  1 TB  ?

How many byte in 1 GB  ?

What is the function of memory? What are its measuring units?

Expand the Terms 1. DVD 2.OCR  3.MICR 4.SRAM 5.HDD

What is Booting? Difference between Cold and warm booting?

Briefly explain the basic architecture of a computer with diagram? [2]

Any two difference between Primary and Secondary storage in Computer

Covert Following binary numbers in Octal and Hexadecimal

(a)   (11110001)   (b) (1010101111)   (c) (10000111101)  

(b)   (d)100011101  (e) 11011010101 

What is source code and Object code ? 

The program code written in assembly or high-level language is called source code. This source code is converted into machine understandable form called machine (object) code, So the execution time of machine code is less than that of source code.

What does a cross platform language means? 

What is IPO cycle ?

Difference between SRAM and DRAM ? 

a) Define computer 1

 b) Which is computer memory? 1

 c) Differentiate compiler and interpreter? 2 

d) Define following: 2

 i. Operating System ii. Parallel Computing

 e) Write difference between SRAM and DRAM. 2 

  f) Prove De-morgan s law using truth table. 

 a) Convert following 2 

1) (101110)2=()8 

2) (4156)8=()16 

b) Write full form of following 2 

1)ASCII 2)ISCII 

c) Define proprietary software and write any two example . 1 

d) What is data? What is output of data processing system? 1 

e) What is bit? How bit, byte and nibble are related with each other? 2

 f) What is application software? Write any two example. 2 

b) Convert (330)10 into binary. 1 

c)Add binary number 11.01 and 101.11.     [1 ]

e)Write the truth table for 2-input XOR gate. 2

 f)State and verify any one De Morgan’s law using truth table. 2 

g)Convert (11011010)2 to decimal number and hexadecimal  number.  

h) Convert (101101.101)2 to Decimal base number 

i)  convert (3674)8 in binary

j)convert (B2F)16 in octal

h) Add the binary numbers (a) 1101101 and 101111 (b) 10110 and 1101

i) convert (1111101110101)2 to octal

j)convert (4ABC)16 to binary

k) convert (FACE)16 to binary

l)Convert (2C9)16 to decimal

What is system bus? what are its type ?

What is the difference between blue ray and DVD  ?  [2]

What is meant by Boolean algebra?

In Mathematics, boolean algebra is called logical algebra consisting of binary variables that hold the values 0 or 1, and logical operations.

Why do we use Boolean algebra?

In electrical and electronic circuits, boolean algebra is used to simplify and analyze the logical or digital circuits.

What are the three main Boolean operators?

The three important boolean operators are:

AND (Conjunction)

OR (Disjunction)

NOT (Negation)

Is the value 0 represents true or false?

In boolean logic, zero (0) represents false and one (1) represents true. In many applications, zero is interpreted as false and a non-zero value is interpreted as true.

Mention the six important laws of boolean algebra.

The six important laws of boolean algebra are:

Commutative law

Associative law

Distributive law

Inversion law

AND law

OR law

Q11. How does computer understand the following text?

(hint: 7 bit ASCII code).

(i) HOTS  (ii) Main   (iii) CaSe  

Q. Differentiate between proprietary software and freeware software. Name two software for each type.