Comp Sci General Questions

Question 1

Python programs are…

Answer 1

Interpreted

Question 2

Python is Case Sensitive…
True or False

Answer 2

True

Question 3

PyCharm would be described as a…
A. Intergrated development

Answer 3

IDE(Integrated Development Environment)

Question 4

How would you convert the string a = “HELLO” to lower case?
a) a.lower()
b) lower(a)
c) recase(a, TO_LOWER)
d) a.recase(TO_LOWER)

Answer 4

a.lower()

Question 4

What would be the best way to find the length of the string a?
a) len(a)
b) a.length()
c) a[*]
d) Count each character

Answer 4

len(a)

Question 5

What is the correct way to create a comment in Python?
a) // My comment
b) # My comment
c) /* My comment */

Answer 5

My comment

Question 6

This is called
(2+3) == 2**(3)

Answer 6

Logical Expression

Question 7

Which of the following is not a control statement in loops?
a) break
b) end
c) continue
d) none of the above
e) all of the above

Answer 7

end

Question 8

In Python, what is the primary purpose of the “continue” keyword within a loop?

Answer 8

To skip the current iteration of the loop and move to the next one

Question 9

What does the keys() method do?

Answer 9

Returns the keys in a dictionary as a list

Question 10

What is the correct way to open the file grades.tsv for reading?

Answer 10

file = open(“grades.tsv”, “r”)

Question 11

What is the correct way to read one full line from the already open file?

Answer 11

line = file.readline()

Question 12

When reading a file, what will the readlines() method return when you reach the end of the file?

Answer 12

It will return an empty string(“”)

Question 13

What should you do when you are done reading or writing a file?

Answer 13

Close the file wirh the .close() method

Question 14

What does sep= method do?

Answer 14

Seperates the strings or lists with a new line or tab

Question 15

How would you remove the extra spaces in the strings and convet the integers and floats correctly?

Answer 15

Use the .strip() to remove spaces and int() or float() to covert the strings

Question 16

What does this method do?
lst = sorted(my_set, reverse=True)

Answer 16

Create a list from the following set sorted in decending order

Question 17

What does lambda mean?

Answer 17

Used as an anonymous function inside another function. Can take any number of arguments, but only have one the expression

Question 18

What does the union() method do?

Answer 18

Will return what both sets have

Question 19

What does the difference() method do?

Answer 19

Will return what each set does not have

Question 20

What does the intersection() method do?

Answer 20

Will get the common values that both sets has

Question 21

What is the issuperset() method?

Answer 21

Returns turn if all items in the specified set exists in the original set

Question 22

What is the issubset() method?

Answer 22

Returns True if all items in a set exists in the specified set, otherwise returns false

Question 23

What is the order of the ouput of the following program?
nums = {5, 9, 2, 0, 1, 3, 4}
print(nums)

Answer 23

Sets are unordered, the order of the ouput is implementation dependent

Question 24

What is the name of the constructor method in Python class?

Answer 24

__init__()

Question 25

What is an instance variable in Python?

Answer 25

A variable defined inside a class to specific to each instance

Question 26

In python, a function within a class definion is called a

Answer 26

method

Question 27

Why is self used as the first parameter in class methods?

Answer 27

It is automatically assigned to the instance calling the method

Question 28

True or False. To divide 2 integers to get an integer result, you can use %%

Answer 28

False

Question 29

What is a way to write counter = counter + 1?

Answer 29

counter += 1

Question 30

What is the main purpose of the "break" function?

Answer 30

To terminate the loop and exit it prematurely

Question 31

What does the term variable scope mean?

Answer 31

The portion of code where a variable can be accessed and modified.

Question 32

def is_mutiple(n): if n % 7 == 0: return n elif n % 3 == 0: return -1 elif n % 2 == 1: return True else: return False a) -1 b) False c) 21 d) True

Answer 32

c) 21

Question 33

True or False. The keys() method in Python returns the keys of a dictionary as list.

Answer 33

True

Question 34

True or False Lists in Python can contain elements of different data types.

Answer 34

True

Question 34

What will this method do? print(my_dct[:-2])

Answer 34

It will print out all the elemets except the last 2

Question 35

True or False. Dictionaries are always of a fixed sixed and cannot be changed.

Answer 35

False

Question 35

True or False. In Python dictionaries, keys must be unique, but values can be duplicated.

Answer 35

True

Question 35

What does this method do? print(prices[1][2])?

Answer 35

It will access the dictionary full of lists. Then it will access the first list and then acess the second element.

Question 36

What will this line do? return None

Answer 36

None

Question 37

Power supply, motherboard and CPU are examples of: A) Inputs and Outputs B) Internal Components C) Memory D) Storage E) None of the above

Answer 37

Internal components

Question 38

The speed of the CPU is measured in: A) Byte B) Bit C) Hz (Hertz) D) None of the above

Answer 38

Hetz(Hz)

Question 39

True or False. Hard Disk (HDD) and solid state drive (SSD) are examples of non-volatile storage

Answer 39

True

Question 40

Which of the following is NOT an example of cloud storage. A) DropBox B) iCloud C) Solid State Drive D) Google Drive

Answer 40

Solid State Drive

Question 41

In computers, data is represented using A) 0 , 1 B) 10 , 2 C) 0, 1, 10 D) 0, 1, 10, 2

Answer 41

0, 1

Question 42

What is the representation used in X and Y X = 1010 Y=1110 A) Both are Binary B) Both are Decimal C) X is Binary and Y is Decimal D) Y is Binary and X is Decimal 2 10

Answer 42

X is binary and Y is Decimal.

Question 43

What colour would rgb(255, 255, 0) or #FFFF00 most likely look like? A) Red B) Green C) Blue D) Yellow E) Purple / Violet

Answer 43

Yellow

Question 44

RGB such as rgb(79, 38, 131) or #4F2683 is a representation used for A)Text B) Numbers C) Memory Addresses D) Colour

Answer 44

Colour

Question 45

Operating Systems (OS): The programs run by an operating system which performs a service or function. Application Programs: A program that controls the computer’s resources. A) True B) False

Answer 45

False

Question 46

Which one of the following is NOT an operating system? A) iOS B) Linux C) Android D) Firefox E) Unix

Answer 46

Firefox

Question 47

True or False. Firmware is a special software on read-only memory (ROM) and Facebook is an example of such software

Answer 47

False

Question 48

True or False. Objects are assigned to memory

Answer 48

True

Question 49

What will this method do? slice = temp[:6]

Answer 49

Will print out every value from from the first element not includes the 6th element

Question 50

What will this method do? slice = temp[6:]

Answer 50

Will print out the rest of the list but including the 6 position

Question 51

What will this function do sort()?

Answer 51

It will sort a list from smallest to greatest

Question 52

What will this method do .insert()?

Answer 52

Depending on the position it will add an element in a desired place in the list

Question 53

Each pixel on your screen is made up of three subpixels, one for each of the following colours: A. Cyan, Magenta, Yellow B. Orange, Green, Violet C. Red, Yellow, Blue D. Red, Green, Blue E. White, Black, Green

Answer 53

Red, Green, Blue

Question 54

CPU" stands for __________. A. Cache memory Processing User B. Computer Python Utility C. Computer Program Unit D. Central Printing Utility E. Central Processing Unit

Answer 54

Central Processing Unit

Question 55

One of the main functions of a GPU is to: A. act as large-scale permanent file storage. B. act as short time volatile file storage. C. accelerate the rendering of 3D graphics. D. compile or interpret Python computer code written by the user. E. ensure the security of the computer’s network connection and encrypt Wifi traffic

Answer 55

Accelerate the rendering of 3D graphics

Question 56

A byte can store ____ character(s) of text. A. 1 B. 4 C. 8 D. 5 E. 3

Answer 56

8 bytes

Question 57

Which of the following is a volatile memory? A. Hard Disk Drive (HDD) B. Solid State Drive (SSD) C. Random Access Memory (RAM) D. Punch Card E. Blu-ray Disk

Answer 57

RAM is volatile.

Question 58

Which mode in Python's open() function is used to both read and write to a file without replacing it?

Answer 58

"a"

Question 59

Why is self used as the first parameter in class methods?

Answer 59

It is automatically assigned to the instance calling the method

Question 60

What does isinstance() mean?

Answer 60

Returns True if the specified object is the specified object

Question 61

Unit testing means...

Answer 61

Testing a class in isolation from other programs

Question 62

Who developed Python? What year?

Answer 62

1990 and Gudio Van Rossum

Question 63

Object Oriented Programming...

Answer 63

is a programming style which tasks are solved by collaborating items. Example, String, Lists, and File objects

Question 64

What is public interface?

Answer 64

The set of all methods provided by a class together with a description of their behavior

Question 65

Encapsulating means..

Answer 65

The process of providing a public interface while hiding the implementation details

Question 66

What is the _ used for?

Answer 66

It is used to indicate to class users that should not directly access the instance variables

Question 67

What is the difference between a function and a method?

Answer 67

A method a parameter that starts with self and it is found under a class. A function is not under a class and you do not need to use self.

Question 68

What is the state of the object?

Answer 68

The values stored in an instance variable make up the state of the object

Question 69

True or false. Always call a Python method with a double underscore ___

Answer 69

False

Question 70

What is an accessor method?

Answer 70

An accessor method asks objects for info without changing it and normally returns current values

Question 71

A mutator method...

Answer 71

Changes value and objects and usually takes a parameter that with change an instance variable. Ex. addItem()

Question 72

What is a tester program?

Answer 72

A tester program is a driver module and contains statements to run methods in the class.

Question 73

Object Reference means...

Answer 73

When a variable does not actually hold an object, but holds a memory location of an object

Question 74

Shared Reference means...

Answer 74

Multiple object variables may contain reference to the same object. These are called aliases

Question 75

How do you test if objects are aliases?

Answer 75

You use the is or is not operator.

Question 76

___eq__ is used for ...

Answer 76

IS called to compare if 2 objects are equal

Question 77

__str__ is used for...

Answer 77

returns a human readable or an informal string representation

Question 78

__repr__ returns...

Answer 78

a more information rich or formal string

Question 79

What does the type() function do?

Answer 79

Returns the type of the object

Question 80

variable scope

Answer 80

the portion of code where a variable can be access or modified.