Hong Kong Taoist Association Tang Hin Memorial Secondary School

S.3 Computer Literacy

2015-16

First Test

Question-Answer Book

Date: 28nd October 2015

Time: 8.40 – 9.20

Instructions:

1. Full mark of this paper is 100.

2. There are 12 pages in this Question-Answer Book.

3. Attempt ALL questions.

4. Put ALL your answer in this Question-Answer Book.

Class:

Name:

Class Number:

A 32

B 10

C 6

D 10

E 8

F 14

G 11

H 9

100

S.3 C.P. 1ST TEST Q&A pp.2/12

Part A: Multiple Choices [32M, 2M@] Put a “” in the box of the most suitable answer.

1. Which of the following is true for console application?

A. The interface is text only.

B. Button can be used.

C. It is easier to use by mouse.

D. Clear method cannot be used.

2. Which of the following cannot be found in timer control?

A. Timer1.enabled

B. Timer1.interval

C. Timer1.Tick

D. Timer1.Exit

3. Which of the following is an error for select…case statement?

A. Case 1 to 100

B. Case >=1 and <=100

C. Case Is <=100

D. Case 100

4. How many output numbers can be displayed for the following part?

For i = 10 To -10 Step -5

Console.WriteLine(i)

Next

A. 4

B. 5

C. 6

D. 7

5. What is the output of the following part?

For i = 10 To 0 Step 2

Console.Write(i)

Next

A. 1086420

B. 109876543210

C. No output

D. 101214161820

6. What is the range of random numbers produced for the expression

Int(Rnd() * 5 - 5)?

A. 5 to 10

B. 0 to 1

C. -5 to -1

D. -4 to 0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

A

B

C

D

S.3 C.P. 1ST TEST Q&A pp.3/12

7. What is the final value of variable i for the following part?

For i = 1 To 10

Console.WriteLine(i)

Next

Console.WriteLine(i)

A. 9

B. 10

C. 11

D. 12

8. Which of the following can always produce a number from 2 to 9? ( n is an integer )

A. n Mod 8 + 2

B. (n+2) Mod 9

C. n Mod 8

D. 1+(n+1) Mod 8

9. Which of the following is can be a name of a variable in Visual Basic?

A. Class

B. Exit

C. Private

D. __234

10. Which of the following operators is calculated first?

A. &

B. +

C. And

D. Or

11. Which of the following returns the value False?

A. True Or False

B. Not True Or Not False

C. True Or Not False

D. Not True Or False

12. Which of the following code segment will create the result below?

A. For i As Integer = 1 To 4

For j As Integer = 5 To 9

Console.Write(j - i)

Next

Console.WriteLine()

Next

B. For i As Integer = 4 To 1 Step -1

For j As Integer = 9 To 5 Step -1

Console.Write(j - i)

Next

Console.WriteLine()

Next

S.3 C.P. 1ST TEST Q&A pp.4/12

C. For i As Integer = 4 To 1 Step -1

For j As Integer = 5 To 9

Console.Write(j - i)

Next

Console.WriteLine()

Next

D. For i As Integer = 1 To 4

For j As Integer = 9 To 5 Step -1

Console.Write(j - i)

Next

Console.WriteLine()

Next

13. Which of the following statement is TRUE?

A. -17 Mod 2 ^ 3 <> 14 - 5 * 3

B. 3 ^ 2 \ 7 > 8 ^ (1 / 3)

C. 4 * 5 \ 3 < 13 * 2 Mod 3

D. 6 \ 3 * 2 = 11 Mod 2 * 5

14. Study these 3 code segments:

I. For i As Integer = 1 To 4

For j As Integer = 1 To i

Console.Write(" ")

Next

Console.WriteLine("*")

Next

Console.ReadLine()

II. For i As Integer = 4 To 1 Step -1

For j As Integer = i To 1 Step -1

Console.Write(" ")

Next

Console.WriteLine("*")

Next

Console.ReadLine()

III. For i As Integer = 1 To 4

For j As Integer = i To 1 Step -1

Console.Write(" ")

Next

Console.WriteLine("*")

Next

Console.ReadLine()

Which of the code segments will create same results?

A. I, II B. II, III

C. I, III D. All of the above

S.3 C.P. 1ST TEST Q&A pp.5/12

15. To create the following output, what should be the code segment?

A. Console.Write("Enter a word: ")

Dim s As String = Console.ReadLine()

Dim t As Integer = Len(s)

Dim u As String = ""

For i As Integer = 1 To t

u &= Mid(s, i, 1)

Console.WriteLine(u)

Next

B. Console.Write("Enter a word: ")

Dim s As String = Console.ReadLine()

Dim t As Integer = Len(s)

Dim u As String = ""

For i As Integer = t To 1 Step -1

u &= Mid(s, i, 1)

Console.WriteLine(u)

Next

C. Console.Write("Enter a word: ")

Dim s As String = Console.ReadLine()

Dim t As Integer = Len(s)

Dim u As String = ""

For i As Integer = 1 To t

u &= Mid(s, 1, i)

Console.WriteLine(u)

Next

D. Console.Write("Enter a word: ")

Dim s As String = Console.ReadLine()

Dim t As Integer = Len(s)

Dim u As String = ""

For i As Integer = t To 1 Step -1

u &= Mid(s, 1, i)

Console.WriteLine(u)

Next

S.3 C.P. 1ST TEST Q&A pp.6/12

16. Which of the following will create a result that is different from the other 3?

A. For i As Integer = 1 To 4

Console.Write("$ |")

Next

Console.WriteLine()

B. For i As Integer = 1 To 4

Console.WriteLine("$ |")

Next

C. For i As Integer = 1 To 4

Console.WriteLine("$ |")

Next

D. For i As Integer = 4 To 1 Step -1

Console.WriteLine("$ |")

Next

Part B: Write down the outputs of the following parts: [10M]

1 For i = 1 To 10 Step 2

Console.Write(i & "!")

Next

2 For i = 1 To 3

For j = 1 To 5

Console.Write("*")

Next

Console.WriteLine()

Next

3 For i = 1 To 2

For j = 1 To 3

Console.Write(i & "-" & j & "-")

Next

Console.WriteLine()

Next

4 For i = 1 To 3

For j = i To 4

Console.Write(j)

Next

Console.WriteLine()

Next

5 For i = 1 To 4

For j = 1 To i

Console.Write("*")

Next

Console.WriteLine()

Next

S.3 C.P. 1ST TEST Q&A pp.7/12

Part C: Console Programming. [6M]

Write a program that calculates the value of f in the formula below:

vu

uvf

The program should be able to produce the sample outputs shown below, where the shaded texts in the sample outputs are the user inputs.

Sample Output 1

Enter the value of u: 1

Enter the value of v: 2

The value of f is 0.666666666666667

Sample Output 2

Enter the value of u: 5.5

Enter the value of v: 2.5

The value of f is 1.78175

Program

Sub Main()

Dim u, v As Double

End Sub

S.3 C.P. 1ST TEST Q&A pp.8/12

Part D: Programming [10M]

Q1 Read the following program:

Sub Main()

Dim i, k, sum As Integer

Console.Write("Enter the value of k: ")

k = Val(Console.ReadLine())

sum = 0

line A: For i = 1 To k

line B: sum += i

Next

Console.WriteLine("sum = " & sum)

Console.ReadLine()

End Sub

a) Write down the screen output when the user inputs 10 for the value of the variable k.

(2M)

______________________________________________________________

______________________________________________________________

b) Change line A only to get the sum of even numbers from 2 to 30 (user’s input) by

using keyword step. (2M)

______________________________________________________________

c) Change line B only to get the sum of even numbers from 2 to 30 (the user inputs 15)

without using keyword step. (1M)

______________________________________________________________

d) What is the final value of sum if k is 10 and the following 3 lines are inserted between

lines A and B? (1M)

If i Mod 5 = 0 Then

Exit For

End If

______________________________________________________________

e) What is the final value of sum if k is 10 and the following 3 lines are inserted

between lines A and B? (1M)

If i Mod 5 = 0 Then

Continue For

End If

______________________________________________________________

f) What is the meaning of i Mod 5 = 0? (1M)

______________________________________________________________

______________________________________________________________

g) What is the use of the above program? (1M)

______________________________________________________________

______________________________________________________________

h) What is the meaning of sum+=i? (1M)

______________________________________________________________

______________________________________________________________

S.3 C.P. 1ST TEST Q&A pp.9/12

Part E: Select Case [8M]

Sammy has written a program that gives comments on an odds on winning. Odds on winning is

calculated by

losses of no.

winsof no.on winning odds

The comment given by Sammy is as follows:

Odds on winning Comment

< 0.5 Very unlucky!

≥ 0.5 but < 1 Unlucky!

≥ 1 but ≤ 2 Lucky!

> 2 Very lucky!

Otherwise Error...

Peter has got a copy of the code. Unfortunately some code has been missing. Please complete the

missing code.

Console.Write("Enter the number of wins: ")

Dim wins As Double = Val( _____________________ )

Console.Write("Enter the number of losses: ")

Dim losses _____________ = Val(Console.ReadLine())

______________________________

Case ______________

Console.WriteLine("Very unlucky!")

Case ______________

Console.WriteLine("Unlucky!")

Case ______________

Console.WriteLine("Lucky!")

Case ______________

Console.WriteLine("Very lucky!")

Case ______________

Console.WriteLine("Error...")

End Select

S.3 C.P. 1ST TEST Q&A pp.10/12

Part F: Write down the output of the following: [14M, 2M@]

Codes Output

1. 2 ^ InStr(3, "opportunities", "o")

2. Dim s As String = "opaque"

Dim t As Integer = InStr(s, "a")

Console.WriteLine(Mid(s, t, t) & mid(s, 3,1))

3. 28 \ InStr("equality", "i") * 2

4. Strings.Left("volcano", 3) & Strings.Right("pulley", 3)

5. Dim u As String = "consultation"

Console.WriteLine(InStr(Len(u) - 4, u, "t"))

6. Dim v As String = "transparent"

Console.WriteLine(Mid(v, 6, 6) & Mid(v, 5, 1))

7. Dim w As Integer = 26726820

Console.WriteLine(Strings.Right(w, 3) Mod 17)

Part G: Programming [11M]

The following programme helps customer to find out the amount to be paid at the “Fun Fun

Catering”. There are two meals (sandwiches and chicken wings) and two drinks (soya milk and

lemon tea) for the customer to choose. [11M]

Firstly, customer will see this display:

After entering all choices, customer will see this display:

S.3 C.P. 1ST TEST Q&A pp.11/12

Complete the programme by filling up the blanks:

Line Code

1 Sub Main()

2 Console.WriteLine(________________________________________ )

3 Console.WriteLine("Please choose your meal and drink.")

4 Console.Write("Select Meal A (Sandwiches) or Meal B (Chicken wings): (Use A or B only) ")

5 Dim meal As String = ____________________ (Console.ReadLine())

6 Console.Write("Select Drink X (Soya milk) or Drink Y (Lemon tea): (Use X or Y only) ")

7 Dim drink As String = ____________________ (Console.ReadLine())

8 Dim total As String

9 Select Case ____________________

10 Case ____________________

11 ____________________

12 Case "X"

13 total = "Sandwiches + Soya milk = $10.5"

14 Case "Y"

15 total = "Sandwiches + Lemon tea = $12.5"

16 End Select

17 Case ____________________

18 Select Case drink

19 Case "X"

20 total = "Chicken wings + Soya milk = $13.5"

21 Case "Y"

22 total = "Chicken wings + Lemon tea = $15.5"

23 End Select

24 ____________________

25 ____________________

26 Console.WriteLine("***** Thanks for your purchase *****")

27 Console.Write("Your meal: " & ____________________)

28 ____________________

29 End Sub

S.3 C.P. 1ST TEST Q&A pp.12/12

Part H: Programming [9M]

Rachel writes a program to find the information of a string. Here is a sample output:

Enter a string: This is a testing string...

The string contains 20 letters, 0 digits, 4 spaces and 3 symbols.

Now write the program below:

Console.Write("Enter a string: ")

Dim s As String = ____________________

Dim letters, digits, spaces, symbols As Integer

For i As Integer = 1 To _________

' Do operations on a character

Select Case _________________

' Both capital and small letters

Case _____________________

letters += 1

Case _____________________

digits += 1

Case " "

__________________

Case Else

symbols += 1

End Select

________

' Output the result

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

_____________________________________________________________

* * * End of S.3 C.P. Paper * * *