Quiz
Intro to Computer Science S2 Chapter 10
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Questions in this quiz (44)
1It is not possible for an array to hold an array.
- ATrue
- BFalse
2Two-dimensional array indexes are listed as [blank_start]rows[blank_end] and [blank_start]columns[blank_end]
- Arows
- Bcolumns
3Two-dimensional arrays store information that can be represented as a [blank_start]grid[blank_end]
- Agrid
4Consider the following code:
grid = []
grid.append (["frog", "cat", "hedgehog"])
grid.append (["fish", "emu", "rooster"])
print (grid)
How many rows does this array have?
[blank_start]2[blank_end]- A2
5Consider the following code:
grid = []
grid.append (["frog", "cat", "hedgehog"])
grid.append (["fish", "emu", "rooster"])
print (grid)
How many columns does this array have?
[blank_start]3[blank_end]- A3
6Consider the following code:
grid = []
grid.append (["frog", "cat", "hedgehog"])
grid.append (["fish", "emu", "rooster"])
What is output by:
print (grid[0][0])
[blank_start]frog[blank_end]- Afrog
7Consider the following code:
grid = []
grid.append (["frog", "cat", "hedgehog"])
grid.append (["fish", "emu", "rooster"])
What is output by:
print (grid[1][2])
[blank_start]rooster[blank_end]- Arooster
8Consider the following code:
grid = []
grid.append (["frog", "cat", "hedgehog"])
grid.append (["fish", "emu", "rooster"])
What is output by:
print (grid[0][1])
[blank_start]cat[blank_end]- Acat
9To iterate through (access all the entries) a two-dimensional arrays you need [blank_start]2[blank_end] for loops. (Enter the number of for loops needed).
- A2
10When using for loops and two-dimensional arrays the outside loop moves across the _____ and the inside loop moves across the ________
- Arows, columns
- Belements, indexes
- Cindexes, elements
- Dcolumns, rows
11Consider the following two-dimensional array:
What word is in [0][1]
[blank_start]will[blank_end]
- Awill
12Consider the following two-dimensional array:
What word is in [1][1]?
[blank_start]realize[blank_end]
- Arealize
13Consider the following two-dimensional array:
What word is in [3][2]?
[blank_start]fabric[blank_end]- Afabric
14Consider the following two-dimensional array:
What word is in [2][1]?
[blank_start]bandana[blank_end]- Abandana
15In two-dimensional arrays the ______ is always listed first
- Arow
- Bcolumn
- Cinitializer list
- Ddimension
16In Python arrays are also called ________
- Acolumns
- Blists
- Cdata
- Dinitializers
17Two-dimensional arrays are really:
- Aan array of arrays
- Bprimitive data types
- Clooped data structure
- Dbooleans
18Two-dimensional arrays are used to store data that can be represented in a _______
- Agrid
- Bstring
- Crow
- Dnumber
19Consider the following two-dimensional array called element:
What is in element [0][1]?
- Awindmill
- Bpretzel
- Cundervalue
- Drational
20Consider the following two-dimensional array called element:
What is in element [1][1]?- Aundervalue
- Brational
- Cpretzel
- Dwindmill
21Why do we use two for loops with two-dimensional arrays?
- Ato do number calculations
- Bto correctly print out the contents
- Cone to move over the rows, and one for the columns
- Dbecause they can store both numbers and words
22Consider the following code:
temp = []
temp.append ([25, 38, 47, 47, 24, 50, 20, 48, 46, 24, 21, 32, 40])
temp.append ([50, 20, 48, 46, 24, 21, 32, 40, 44, 47, 25, 22, 29])
temp.append ([21, 32, 40, 44, 47, 25, 22, 29, 26, 39, 43, 30, 49])
print (temp[1][2])
What is output?- A20
- B32
- C38
- D48
23Consider the following code:
ar = []
ar.append ([29, 21, 33, -30])
ar.append ([39, 26, -43, 42])
ar.append ([123, 43, 33, 46])
for r in range(len(ar)):
for c in range(len(ar[0])):
print (ar[r][c], end=' ')
print ("")
How many columns does the array have?- A3
- B4
- C2
- D1
24Consider the following code:
grid = []
grid.append (["frog", "cat", "hedgehog"])
grid.append (["fish", "emu", "rooster"])
print (grid[0][2])
What is output?- Acat
- Brooster
- Cemu
- Dhedgehog
25In two-dimensional arrays the ______ is always listed second
- Ainitializer list
- Brow
- Cdimension
- Dcolumn
26Consider the following two-dimensional array:
42 - 31 - 32 - 79
37 - 85 - 82 - 66
35 - 39 - 28 - 25
What is an element [2][1]- A39
- B85
- C82
- D42
27Consider the following two-dimensional array:
42 - 31 - 32 - 79
37 - 85 - 82 - 66
35 - 39 - 28 - 25
What is an element [1][1]- A82
- B42
- C39
- D85
28In an array the element is ______
- Aan individual piece of data is stored in an array
- Ball of the data stored in an array
- Cthe dimensions of the array
- Dthe location of an individual piece of data in an array
29What does it mean that arrays are row major?
- Arow comes first in the index of an element
- Bthe row comes first in the element of an index
- Cthe row comes second in the element of an index
- Dall of the data stored in rows
30To create a 2D array which of the following is NOT correct
- Astuff = []
stuff.append([1, 5, 7, 2]) - Bstuff = [][]
- Cstuff = [[3, 4, 5], [6, 3, 1]]
- Dstuff.append([])
stuff[0].append(7)
- Astuff = []
31Consider the following code:
grid = []
grid.append([63, 59, 25, 86, 86, 24, 31] )
grid.append([17, 28, 67, 68, 44, 27, 33] )
grid.append([24, 31, 28, 67, 68, 44, 27] )
What are the dimensions of the two-dimensional array?- A4x7
- B7x7
- C3x7
- D7x3
32Consider the following code:
temp = []
temp.append ([25, 38, 47, 47, 24, 50, 20, 48, 46, 24, 21, 32, 40])
temp.append ([50, 20, 48, 46, 24, 21, 32, 40, 44, 47, 25, 22, 29])
temp.append ([21, 32, 40, 44, 47, 25, 22, 29, 26, 39, 43, 30, 49])
print (temp[2][1])
What is output?- A38
- B32
- C48
- D20
33Consider the following code:
ar = []
ar.append ([29, 21, 33, -30])
ar.append ([39, 26, -43, 42])
ar.append ([123, 43, 33, 46])
for r in range(len(ar)):
for c in range(len(ar[0])):
print (ar[r][c], end=' ')
print ("")
How many rows does the array have?- A4
- B3
- C2
- D1
34Consider the following code:
grid = []
grid.append (["frog", "cat", "hedgehog"])
grid.append (["fish", "emu", "rooster"])
print (grid[0][2])
What is output?- Acat
- Bemu
- Chedgehog
- Dfish
35Why do we use two for loops with 2D arrays?
- Abecause they can store both numbers and words
- Bone to move over the rows, and one for the columns
- Cto correctly print out the contents
- Dto do number calculations
36Consider the following code that stores values in a 5 x 3 array called grid:
grid = []
grid.append (["frog", "cat", "hedgehog"])
grid.append (["fish", "emu", "rooster"])
grid.append (["dog", "bird", "rabbit"])
grid.append (["deer", "chipmunk", "opossum"])
grid.append (["fox", "coyote", "wolf"])
f = 0
for r in range (len (grid)):
for c in range (len(grid[0])):
f = f + 1
grid[r][c] = r * c
What is the array re-initialized to after running the code?- A2 - 2 - 2
3 - 2 - 2
4 - 3 - 2
5 - 3 - 3
6 - 4 - 3 - B0 1 2
1 2 3
2 3 4
3 4 5
4 5 6 - C0 0 0
0 1 2
0 2 4
0 3 6
0 4 8 - D1 1 1
1 2 3
1 3 5
1 4 7
1 5 9
- A2 - 2 - 2
37Which method correctly swaps two rows of an array?
- Adef swapRows (grid, a, b):
if ( a >=0 and a < len(grid)):
if ( b >=0 and b < len(grid)):
for r in range(len(grid)):
temp = grid[a][r]
grid[a][r] = grid[b][r]
grid[b][r] = temp - Bdef swapRows (grid, a, b):
if ( a >=0 and a < len(grid)):
if ( b >=0 and b < len(grid)):
for r in range(len(grid)):
temp = grid[r][a]
grid[r][a] = grid[r][b]
grid[r][b] = temp - Cdef swapRows (grid, a, b):
if ( a >=0 and a < len(grid)):
if ( b >=0 and b < len(grid)):
for c in range(len(grid[0])):
temp = grid[a][c]
grid[a][c] = grid[b][c]
grid[b][c] = temp - Ddef swapRows (grid, a, b):
if ( a >=0 and a < len(grid)):
if ( b >=0 and b < len(grid)):
for c in range(len(grid[0])):
temp = grid[c][a]
grid[c][a] = grid[c][b]
grid[c][b] = temp
- Adef swapRows (grid, a, b):
38Which loop initializes the array grid to the following values?
1 2 3
4 5 6
7 8 9
10 11 12
13 14 15- Afor r in range (len (grid)):
for c in range (len(grid[0])):
grid[r][c] = r + 1 - Bfor r in range (len (grid)):
for c in range (len(grid[0])):
grid[r][c] = c + 1 - Cfor r in range (len (grid)):
for c in range (len(grid[0])):
grid[r][c] = r + c - Df = 0
for r in range (len (grid)):
for c in range (len(grid[0])):
f = f + 1
grid[r][c] = f
- Afor r in range (len (grid)):
39Write the code to initialize a 4 x 3 array to the values:
1 2 3
1 2 3
1 2 3
1 2 3
Assume the array called values is already declared and initialized as a 4 x 3 array.- Afor r in range (len (values)):
for c in range (len(values[0])):
values[r][c] = r + c - Bfor r in range (len (values)):
for c in range (len(values[0])):
values[r][c] = c + 1 - Cfor r in range (len (values)):
for c in range (len(values[0])):
values[r][c] = r + 1 - Dfor r in range (len (values)):
for c in range (len(values[0])):
values[r][c] = r * c
- Afor r in range (len (values)):
40Consider the following two-dimensional array:
11 25 57 97 50
67 22 45 89 38
42 12 98 73 41
88 61 82 71 62
44 27 97 54 98
88 76 77 29 66
93 12 46 12 87
95 38 82 22 35
35 26 18 83 97
73 13 26 12 94
66 42 74 78 32
53 43 10 72 10
Which loop correctly adds the values in the fourth column (i.e. the column accessed by index 3)?- Asum = 0
for r in range(len(a)):
sum = sum + a[r][3] - Bsum = 0
for r in range(len(a)):
A[r][3] = a[r][3] + sum - Csum = 0
for r in range(len(a)):
sum = sum + a[3][r] - Dsum = 0
for i in range(12):
for j in range(5):
sum = sum + a[r][c]
- Asum = 0
41Consider the following code:
vals = []
Which loop correctly builds a 14 x 17 array initialized to random 2-digit numbers?- Afor r in range(14):
vals.append([])
for c in range(17):
vals[r][c] = random.randint(10,99) - Bfor r in range(14):
for c in range(17):
vals[r].append (random.randint(10,99)) - Cfor r in range(17):
vals.append([])
for c in range(14):
vals[r].append (random.randint(10,99)) - Dfor r in range(14):
vals.append([])
for c in range(17):
vals[r].append (random.randint(10,99))
- Afor r in range(14):
42Row-major means:
- Athe for loop only iterates through the columns
- Bthe for loop only iterates through the rows
- Ccolumns first in the index
- Drows come first in the index
43Consider the following code:
grid = []
grid.append( [])
grid [0].append (9)
grid [0].append (7)
grid [0].append (5)
grid [0].append (3)
grid.append( [])
grid [1].append (2)
grid [1].append (8)
grid [1].append (1)
grid [1].append (3)
How many rows and columns does this array have?- A4 rows 2 columns
- B2 rows 4 columns
- C4 rows 4 columns
- D2 rows 2 columns
44A _______ variable is available to all methods in a program
- Aswap
- Btemp
- Clocal
- Dglobal
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- 10th grade Computer Science Quiz on Intro to Computer Science S2 Chapter 10, created by Grant Eversole on 10/05/2018.
- Author
- Grant Eversole
- Language
- English
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