Mathematical Expressions Quiz (MCQs)

Which of the following algorithms displays the correct distance for all possible values of num1 and num2 ?

• Step 1:

  Add num1 and num2 and store the result in the variable sum.

   Step 2:    Take the absolute value of sum and display the result.

• Step 1:

  Subtract num1 from num2 and store the result in the variable diff.

  Step 2:

  Take the absolute value of diff and display the result.

• Step 1:

  Take the absolute value of num1 and store it in the variable absNum1.

  Step 2:

  Take the absolute value of num2 and store it in the variable absNum2.

  Step 3:

  Add absNum1 and absNum2 and display the result.

• Step 1:

  Take the absolute value of num1 and store it in the variable absNum1.

  Step 2:

  Take the absolute value of num2 and store it in the variable absNum2.

  Step 3:

  Subtract absNum1 from absNum2 and display the result.

A teacher has a goal of displaying the names of 2 students selected at random from a group of 30 students in a classroom. Any possible pair of students should be equally likely to be selected. Which of the following algorithms can be used to accomplish the teacher’s goal?

• 
  

  A

  Step 1:

  Assign each student a unique integer from 1 to 30.

  Step 2:

  Generate a random integer n from 1 to 15.

  Step 3:

  Select the student who is currently assigned integer n and display the student’s name.

  Step 4:

  Generate a new random integer n from 16 to 30.

  Step 5:

  Select the student who is currently assigned integer n and display the student’s name.

• Step 1:

  Assign each student a unique integer from 1 to 30.

  Step 2:

  Generate a random integer n from 1 to 30.

  Step 3:

  Select the student who is currently assigned integer n and display the student’s name.

  Step 4:

  Generate a new random integer n from 1 to 30.

  Step 5:

  Select the student who is currently assigned integer n and display the student’s name.

• Step 1:

  Assign each student a unique integer from 1 to 30.

  Step 2:

  Generate a random odd integer n from 1 to 29.

  Step 3:

  Select the student who is currently assigned integer n and display the student’s name.

  Step 4:

  Generate a new random even integer n from 2 to 30.

  Step 5:

  Select the student who is currently assigned integer n and display the student’s name.

• Step 1:

  Assign each student a unique integer from 1 to 30.

  Step 2:

  Generate a random integer n from 1 to 30.

  Step 3:

  Select the student who is currently assigned integer n and display the student’s name.

  Step 4:

  The student who was selected in the previous step is assigned 0. All other students are reassigned a unique integer from 1 to 29.

  Step 5:

  Generate a new random integer n from 1 to 29.

   Step 6:

  Select the student who is currently assigned integer n and display the student’s name.

Which of the following code segments can be used to interchange the values of the variables num1 and num2 ?

• num 1 - num 2

  num 2 - num 1

• temp - num 1

  num 1 - temp

  num2- num 1

• temp - num 1

  num 2 - num 1

  num 1 - temp

• temp - num 1

  num 1- num 2

  num 2 - temp

Which of the following code segments can be used to update the values of the variables as shown in the table?

• temp ← word1

  word3 ← word1

  word1 ← temp

• temp ← word1

  word1 ← word3

  word3 ← temp

• temp ← word1

  word1 ← word2

  word2 ← word3

  word3 ← temp

• temp ← word3

  word3 ← word2

  word2 ← word1

  word1 ← temp

Which of the following initial values of the variable y would result in the variable z being set to 2 after the code segment is executed?

• 1

• 2

• 3

• 4

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

a - 10

b - 20

c - 30

d - 40

x - 20

b- x+b

a- x+1

d- c + d/2

dispaly a,b,c,d

• 10 20 30 40

• 21 30 40 50

• 21 40 30 40

• 21 40 30 50