RRB JE Stage 2 Computer and Applications Questions Part 2 Previous year Questions wth answers and explanation

1. PREVIOUS YEARS QUESTIONS WITH
ANSWER AND EXPLANATION
Part - 2
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2. 2
In computing, virtual memory
is a memory management
technique that provides an
"idealized abstraction of the
storage resources that are
actually available on a given
machine" which "creates the
illusion to users of a very
large memory
Answer: (c)

3. 3
• Disk scheduling is done by operating systems to schedule I/O requests
arriving for the disk.
• Disk scheduling is also known as I/O scheduling.
• Disk scheduling is important because: Multiple I/O requests may arrive
by different processes and only one I/O request can be served at a time by
the diskcontroller.
Answer: (b)

4. 4
First come, first served
Shortest seek time first

5. 5
Answer: (d)

6. 6
Answer: (d)

7. 7
Answer: (d)

8. 8
Answer: (c)

9. 9
Answer: (b)

10. 10
Answer: (b)

11. 11
Answer: (c)

12. 12
A real-time operating system is an
operating system intended to serve real-
time applications that process data as it
comes in, typically without buffer delays.
These types of OSs serves the real-time
systems.
The time interval required to process and
respond to inputs is very small. This time
interval is called response time.
Real-time systems are used when there
are time requirements are very strict like
missile systems, air traffic control
systems, robots etc.
Answer: (d)

13. 13
Answer: (a)

14.  IPv4 - 32 bit Address
 IPv6 - 128 bit Address
IPv4 (32 bit)
 With the help of IP we send message from source to
destination.
 Each nodes have unique IP address.
 IPv4 is 32 bit logical address.
 It have 4 octets (8 Bit each), each octet can have 0 to 255 max
and min value.
 It is made of two parts: Network ID + host ID
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15.  IPv4 uses 32-bit addresses:
 The address space=232 =4,294,967,296 ( more than 4
billion)
 This means, if there were no restrictions, more than 4
billion devices could be connected to the Internet.
 IPv6 uses 128 bit-addresses (2128) (Approx. 340 billion)
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16.  There are two prevalent notations to show an IPv4 address:
1. Binary notation:
 Address is displayed as 32 bits.
 Each octet is often referred to as byte.
 IPv4 address referred to as 32-bit address or 4- byte address
Example:
 01110101 10010101 00011101 00000010
2. Dotted-decimal notation:
 More compact and easier to read
 Written in decimal form with a decimal point( dot) separating the bytes.
Example: 117.149.29.2
 Each decimal value range from 0 to 255
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17. 17

18.  Change the following IPv4 addresses from
binary notation to dotted-decimal notation.
 Solution
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19.  Change the following IPv4 addresses from
dotted decimal notation to binary notation.
 Solution
19

20.  Find the errors, if any, in the following IPv4
addresses.
 Solution
a. There must be no leading zero (045).
b. There can be no more than four numbers.
c. Each number needs to be less than or equal to 255.
d. A mixture of binary notation and dotted-decimal
notation is not allowed.
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21. 21

22. 22
IPAddress Class
a. 193.42.1.1
a. 95.0.21.90
a. 220.200.23.1
a. 10.250.1.1
a. 249.240.80.78
a. 150.10.15.0
a. 199.155.77.56
a. 126.8.156.0
a. 192.14.2.0
a. 177.100.18.4
a. 33.0.0.0
a. 117.89.56.45
a. 158.98.80.0
a. 219.21.56.0
Identify the respective classes of the given IP addresses.

23. 23
Apache Hadoop is a collection of open-source software utilities that facilitate using a
network of many computers to solve problems involving massive amounts of data and
computation. It provides a software framework for distributed storage and processing of
big data using the MapReduce programming model.
1. Netscape navigator- it is one of the original web
browser.
2. Internet explorer (IE)- product of Microsoft.
3. Firefox- new browser derived from Mozilla.
4. Google chrome- Developed by Google.
5. Safari- developed by apple included in Mac OS
6. Opera- smaller and faster than most other browsers.
7. Slimjet browser
8. Maxthon
9. SlimBrowser
10. Netsurf browser
11. Macweb
12. UC browser
Answer: (d)

24. 24
Answer: (d)

25. 25
Answer: (d)

26. 26
Answer: (c)

27. 27
• ASCII characters are represented by seven bits.
• These are standard character codes used to store data so that
it may be used by other software programs.
• The standard ASCII codes defines 128 character code (from
0 to 127).
• Basically, ASCII codes are of two types:
• ASCII-7 : it is a 7-bit standard ASCII code, it allows = 128
unique symbols.
• ASCII-8 : It is an extended version of ASCII-7. It is an 8-bit
code, it allows = 256 symbols or characters.
Answer: (b)

28. 28
Answer: (a)

29. 29
Answer: (a)

30. 30
Answer: (b)

31. 31
Answer: (c)

32. 32
Answer: (c)

33. 33
1. Netscape navigator- it is one of the original web
browser.
2. Internet explorer (IE)- product of Microsoft.
3. Firefox- new browser derived from Mozilla.
4. Google chrome- Developed by Google.
5. Safari- developed by apple included in Mac OS
6. Opera- smaller and faster than most other browsers.
7. Slimjet browser
8. Maxthon
9. SlimBrowser
10. Netsurf browser
11. Macweb
12. UC browser
Answer: (c)

34. 34
Answer: (b)

35. 35
PROM (Programmable Read-Only Memory) is a computer memory chip that can be
programmed once after it is created.
Once the PROM is programmed, the information written is permanent and cannot be erased or
deleted.
An EPROM (Erasable programmable read-only memory) is a type of PROM chip that
retains its data when its power supply is switched off. Computer memory that can retrieve
stored data after a power supply has been turned off and back on is called non-volatile.
EEPROM (Electrically Erasable Programmable Read-Only Memory) is a type of non-
volatile memory used in computers, integrated in microcontrollers for smart cards and remote
keyless systems, and other electronic devices to store relatively small amounts of data but
allowing individual bytes to be erased and reprogrammed.
Answer: (d)

36. 36
Answer: (c)

37. 37
1. Binary coded decimal (BCD).
 Binary coded decimal is a number system where four bits are used to
represent each decimal digits.
 BCD is a method of using binary digits to represent the decimal digits (0-9).
 In BCD system, there is no limit on size of a number.
48 – 0100 1000
Answer: (a)

38. 38
Answer: (d)

39. 39
Answer: (a)

40. 40
Answer: (b)

41. 41
OLE - Object Linking and Embedding:
OLE is a compound document standard developed by Microsoft Corporation.
It enables you to create objects with one application and then link or embed them in a second
application.
DOM - The Document Object Model (DOM) is an application programming interface (API) for
HTML and XML documents.
It defines the logical structure of documents and the way a document is accessed and manipulated.
MODEM – (Modulator-Demodulator) is a hardware device that converts data into a format suitable
for a transmission medium so that it can be transmitted from computer to computer (historically over
telephone wires).
OpenDoc is a multi-platform software componentry framework standard created by Apple for
compound documents, intended as an alternative to Microsoft's Object Linking and Embedding
(OLE).
Answer: (c)

42. 42
Will Continue in Part 3