Computer Science Test

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Computer Science Test - 18

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Weekly Quiz Competition

Question 1
5 / -1

Insertions take place at the rear end of the queue and deletions take place at the 'front' end of the queues. On which principal does this work?

A
logical in first out

B
First in first out

C
last in first out

D
last in logical out

Solution

In linear queue, an insertion takes place from one end while the deletion occurs from another end. The end at which the insertion takes place is known as the rear end, and the end at which the deletion takes place is known as the front end.
Question 2
5 / -1

What is the significance of the tell() method?

A
It tells the path of file.

B
It tells the current position of the file pointer within the file.

C
It tells the end position within the file.

D
It checks the existence of a file at the desired location.

Solution

The tell() method returns the current position of file object. This method takes no parameters and returns an integer value. Initially file pointer points to the beginning of the file (if not opened in append mode). So, the initial value of tell() is zero.
Question 3
5 / -1

Computers manipulate data in many ways, this manipulation is called _____.

A
utilizing

B
batching

C
upgrading

D
processing

Solution

Processing is any computer program that is not a control program, such as an application program, or a non-controlling part of the operating system, such as a sort-merge program or language translator.
Question 4
5 / -1

What are the two advantages of database management system?

A
data base security and system

B
data base security and integrity

C
data base security and shering

D
data base calculation and integrity

Solution

Data base security and integrity are two advantages of the data base management system. Central control also ensures that adapted checks are incorporated.
Question 5
5 / -1

Which method is used to protect online images from hackers?

A
Shrink wrapping

B
Firewall

C
Email security

D
None of these

Solution

A firewall is an essential piece of security software that monitors all incoming and outgoing traffic going through your network, checking for hackers, malware, unauthorized outgoing information, or anything that might put you or your PC at risk. Firewalls are often the first line of defense when protecting your data.
Question 6
5 / -1

_________ switching is well suited for voice communication while _________switching is better suited for data and other non-voice communication.

A
Message; Circuit

B
Circuit; Message

C
Packet; Circuit

D
Circuit; Packet

Solution

In-circuit switching when the source does not have enough data to transmit, the resources are unnecessarily kept idle. To avoid such situation, Message switching is used.
Circuit Switching is a switching technique method that establishes a dedicated path between the sender and the receiver to send the data. The example of a Circuit-switch network is a telephone network.
Question 7
5 / -1

Consider a declaration, L = (1, 'Python', '3.14').

Which of the following represents the data type of L?

A
List

B
Tuple

C
Dictionary

D
String

Solution

A tuple is almost like a List and contains python objects and objects inside are separated by comma (,) and enclosed within parentheses.

Example:

list1 = (6.25, 'brinjal', 'onion', 'beans')
list1 is a tuple.
Question 8
5 / -1

Which of the following file modes is not valid?

A
rw

B
ab

C
w+

D
r+

Solution

File mode r+, w+, or a+ may be to perform both read and write operations using a single file object.
Question 9
5 / -1

Directions For Questions

Radha Shah is a programmer, who has recently been given a task to write a python code to perform the following CSV file operations with the help of two user defined functions/modules:

a. CSVOpen() : to create a CSV file called BOOKS.CSV in append mode containing information of books – Title, Author, and Price.
b. CSVRead() : to display the records from the CSV file called BOOKS.CSV where the field title starts with 'R'.

She has succeeded in writing partial code and has missed out certain statements, so she has left certain queries in comment lines.
import csv
def CSVOpen():
with open('books.csv','______',newline='') as csvf:
#Statement-1
cw=______ #Statement-2
______ #Statement-3
cw.writerow(['Rapunzel','Jack',300])
cw.writerow(['Barbie','Doll',900])
cw.writerow(['Johnny','Jane',280])
def CSVRead():

...view full instructions

Choose the appropriate mode in which the file is to be opened in append mode (Statement 1).

A
w+

B
ab

C
r+

D
a

Solution

Mode 'a' opens a file for appending. The file pointer is placed at the end of the file, if the file exists. If the file does not exist, it creates a new file for writing.
Question 10
5 / -1

Directions For Questions

Radha Shah is a programmer, who has recently been given a task to write a python code to perform the following CSV file operations with the help of two user defined functions/modules:

a. CSVOpen() : to create a CSV file called BOOKS.CSV in append mode containing information of books – Title, Author, and Price.
b. CSVRead() : to display the records from the CSV file called BOOKS.CSV where the field title starts with 'R'.

She has succeeded in writing partial code and has missed out certain statements, so she has left certain queries in comment lines.
import csv
def CSVOpen():
with open('books.csv','______',newline='') as csvf:
#Statement-1
cw=______ #Statement-2
______ #Statement-3
cw.writerow(['Rapunzel','Jack',300])
cw.writerow(['Barbie','Doll',900])
cw.writerow(['Johnny','Jane',280])
def CSVRead():

...view full instructions

Choose the correct option for Statement 3 to write the names of the column headings in the CSV file, BOOKS.CSV.

A
cw.writerow('Title','Author','Price')

B
cw.writerow(['Title','Author','Price'])

C
cw.writerows('Title','Author','Price')

D
cw.writerows(['Title','Author','Price'])

Solution

Correct code for statement 3 is cw.writerow (['Title', 'Author', 'Price']) where, Title, Author and Price are the columns. writerow () method is used to write single row at a time.

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Computer Science Test - 18

Result

Computer Science Test - 18

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SHARING IS CARING

Question 1

logical in first out

First in first out

last in first out

last in logical out

Solution

Question 2

It tells the path of file.

It tells the current position of the file pointer within the file.

It tells the end position within the file.

It checks the existence of a file at the desired location.

Solution

Question 3

utilizing

batching

upgrading

processing

Solution

Question 4

data base security and system

data base security and integrity

data base security and shering

data base calculation and integrity

Solution

Question 5

Shrink wrapping

Firewall

Email security

None of these

Solution

Question 6

Message; Circuit

Circuit; Message

Packet; Circuit

Circuit; Packet

Solution

Question 7

List

Tuple

Dictionary

String

Solution

Question 8

rw

ab

w+

r+

Solution

Question 9

w+

ab

r+

a

Solution

Question 10

cw.writerow('Title','Author','Price')

cw.writerow(['Title','Author','Price'])

cw.writerows('Title','Author','Price')

cw.writerows(['Title','Author','Price'])

Solution

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