1 How many times does a loop with the header for count in xrange(10): execute th
ID: 3664753 • Letter: 1
Question
1 How many times does a loop with the header for count in
xrange(10): execute the statements in its body?
a 9 times
b 10 times
c 11 times
2 A for loop is convenient for
a making choices in a program
b running a set of statements a predictable number of times
c counting through a sequence of numbers
d describing conditional iteration
3 What is the output of the loop for count in xrange(5):
print count?
a 1 2 3 4 5
b 1 2 3 4
c 0 1 2 3 4
4 When the function xrange receives two arguments, what does the
second argument specify?
a the last value of a sequence of integers
b the last value of a sequence of integers plus 1
c the last value of a sequence of integers minus 1
5 Consider the following code segment:
xƒ=ƒ5
yƒ=ƒ4
ifƒxƒ>ƒy:
ƒƒƒprintƒy
else:
ƒƒƒprintƒx
What value does this code segment print?
a 4
b 5
6 A Boolean expression using the and operator returns True when
a both operands are true
b one operand is true
c neither operand is true
7 By default the while loop is an
a entry-controlled loop
b exit-controlled loop
8 Consider the following code segment:
ƒƒƒcountƒ=ƒ5
ƒƒƒwhileƒcountƒ>ƒ1:
ƒƒƒƒƒƒprintƒcount,
ƒƒƒƒƒƒcountƒ-=ƒ1
What is the output produced by this code?
a 1 2 3 4 5
b 2 3 4 5
c 5 4 3 2 1
d 5 4 3 2
9 Consider the following code segment:
ƒƒƒcountƒ=ƒ1
ƒƒƒwhileƒcountƒ<=ƒ10:
ƒƒƒƒƒƒprintƒcount,
Which of the following describes the error in this code?
a The loop is off by 1.
b The loop control variable is not properly initialized.
c The comparison points the wrong way.
d The loop is infinite.
10 Consider the following code segment:
ƒƒƒsumƒ=ƒ0.0
ƒƒƒwhileƒtrue:
11 The expression len(data) evaluates to
a 8
b 7
c 6
12 The expression data[1] evaluates to
a 'N'
b 'o'
13 The expression data[-1] evaluates to
a '!'
b 'y'
14 The expression data[3:6] evaluates to
a 'way!'
b 'way'
c ' wa'
15 The expression data.replace(“No”, “Yes”) evaluates to
a 'No way!'
b 'Yo way!'
c 'Yes way!'
16 The expression data.find(“way!”) evaluates to
a 2
b 3
c True
17 A Caesar cipher locates the coded text of a plain text character
a A given distance to the left or the right in the sequence of characters
b In an inversion matrix
18 The binary number 111 represents the decimal integer
a 111
b 3
c 7
19 Which of the following binary numbers represents the decimal integer
value 8?
a 11111111
b 100
c 1000
20 Which file method is used to read the entire contents of a file in a
single operation?
a readline
b read
c a for loop
Explanation / Answer
1 How many times does a loop with the header for count in
xrange(10): execute the statements in its body?
Answer:
b 10 times
2 A for loop is convenient for
Answer:
b running a set of statements a predictable number of times
3 What is the output of the loop for count in xrange(5):
print count?
Answer:
c 0 1 2 3 4
4 When the function xrange receives two arguments, what does the
second argument specify?
Answer:
b the last value of a sequence of integers plus 1
5 Consider the following code segment:
xƒ=ƒ5
yƒ=ƒ4
ifƒxƒ>ƒy:
ƒƒƒprintƒy
else:
ƒƒƒprintƒx
What value does this code segment print?
Answer:
a 4
6 A Boolean expression using the and operator returns True when
Answer:
a both operands are true
7 By default the while loop is an
Answer:
a entry-controlled loop
8 Consider the following code segment:
ƒƒƒcountƒ=ƒ5
ƒƒƒwhileƒcountƒ>ƒ1:
ƒƒƒƒƒƒprintƒcount,
ƒƒƒƒƒƒcountƒ-=ƒ1
What is the output produced by this code?
Answer:
c 5 4 3 2 1
19 Which of the following binary numbers represents the decimal integer
value 8?
Answer:
b 100
20 Which file method is used to read the entire contents of a file in a
single operation?
b read
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