AP CSP Practice Test 1 (1)

Consider the following code.

What is displayed because of executing the code segment?

• 1 3 5 7 9

• 1 5 7

• 3 9

• 9

Answer explanation

Consider the following code segment.

What is displayed as a result of executing the code segment?

• Dog Cat Fish Golden Bandicoot

• Dog Cat Fish

• Dog Golden Bandicoot Cat Fish

• Golden Bandicoot Cat Fish

Answer explanation

petList is initialized containing the value Dog

petList[Dog]

- The value Cat is added to the end of petList

- petList[Dog Cat]

- The value Fish is added to the end of petList

- petList[Dog Cat Fish]

The value Golden Bandicoot is added at position 2 of petList and shifts all values after position 2 to the right.

- petList [Dog Golden Bandicoot Cat Fish]

- The value in position 1 of petList is removed, and all values to the right of position 1 are shifted to the left: petList[Golden Bandicoot Cat Fish]

Each item in petList is displayed, resulting in [Golden Bandicoot Cat Fish].

Students at a high school receive letter grades based on the following scale:

Scores - Grades letter

• I only

• III only

• I and II only

• I, II and III

Answer explanation

Colors can be represented by decimal values from 0 to 255. If each pixel in a photo is a combination of three color values, what is the minimum number of bits needed to store a single pixel?

• 512

• 256

• 24

• 8

Answer explanation

Determine the minimum number of bits to hold the number 254:

254 − 128 = 126

  126 − 64 = 62

    64 − 32 = 30

    30 − 16 = 14

      14 − 8 = 6

        6 − 4 = 2

        2 − 2 = 0

11111110

It takes 8 bits to hold the number 255.

Three colors would require 8 bits × 3 = 24 bits.

Which of the following is a true statement about data transmitted over the internet?

• All data traveling over the internet is binary.

• Packets are received in the same order that they are sent.

• Redundancy in the design of the internet is overseen by large companies that set the standards used.

• The domain name system (DNS) has been challenged by the Digital Millennium Copyright Act (DMCA).

Answer explanation

The internet uses fiber-optic cables that transmit data as “on” or “off,” which is represented in binary as 0 or 1.

(B)Due to the fault-tolerant nature of the internet, packets travel in different directions through the internet. Since packets travel in different directions, they arrive at their destination in a different order than that in which they were sent.

(C)There is no central governing body that controls the design of the internet.

(D)The Digital Millennium Copyright Act does not relate to the internet naming convention.

What will the following code segment display?

• 1 4 7 10 9

• 10

• 9 10 7 4 1

• Nothing will be displayed due to the error index out of bounds.

Answer explanation

The procedure is trying to access index 0. The language used on this AP exam starts on index 1. So 0 is out of bounds and will result in an error.

What should replace <missing condition> so that the program below displays TRUE 60% of the time?

• x < 6

• x >= 6

• x > 10

• x £ 10

Answer explanation

There are ten numbers between 5 and 14 inclusive: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14. For the condition to evaluate to true 60% of the time, six of the ten numbers must be included: 5, 6, 7, 8, 9, 10. Since x £ 10 would include six numbers, it would result in being true 60% of the time

(A)x < 6 would include only one number and would result in being true 10% of the time.

(B)x ≥ 6 would include nine numbers and would result in being true 90% of the time.

(C)x > 10 would include four numbers and would result in being true 40% of the time.

What percentage of the time will the program display an even number?

Line  1:  num ← RANDOM(1,10)

Line  2:  IF(num < 5 AND num MOD 2 = 0)

Line  3:  {

Line4:      DISPLAY(num)

Line 5:   }

• 10%

• 20%

• 30%

• 40%

Answer explanation

The program states that num can be 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10. Of those numbers, 1, 2, 3, and 4 are less than 5. Of those, only 2 and 4 are also even. Two out of ten numbers equals 20%.

(A)Ten percent (10%) would be one out of ten numbers.

(C)Forty percent (40%) would be four out of ten numbers.

(D)Fifty percent (50%) would be five out of ten numbers.

What will the following code segment display?

• 11

• 6

• 3

• Nothing will be displayed due to an error.

Answer explanation

A list can directly access elements by index. In this AP exam, indexes start at 1. Accessing index 2 will result in displaying the number 3. In this example, list[1] would access 11, list[2] is 3, list[3] is 5, and list[4] is 6.

A flowchart is a way to represent an algorithm visually. The flowchart below uses the following building blocks.

What will the program above display?

• 2 8

• 4 8

• 2 7

• 3 7

Answer explanation

Step 1: Start the program.

Step 2: Set num = 4.

Step 3: Is 4 > 2 evaluates to true.

Step 4: Display 4.

Step 5: Is 4 > 7 evaluates to false.

Step 6: Set num = 5.

Step 7: Is 5 > 7 evaluates to false.

Step 8: Set num = 6.

Step 9: Is 6 > 7 evaluates to false.

Step 10: Set num = 7.

Step 11: Is 7 > 7 evaluates to false.

Step 12: Set num = 8.

Step 13: Is 48 > 7 evaluates to true.

Step 14: Display 8.

Step 15: End the program.