Praxis 5652 Computer Science Prep Mod 6 Basic Boolean Logic

Evaluate the following code segment.

boolean x <- true
boolean y <- false
boolean z <- true

Which expression evaluates to true?

• (x and y) and (y or z)

• not((x and y) or (x and z))

• (x and y) and (x and z)

• (x and y) or (x and z)

Answer explanation

https://drive.google.com/file/d/16YxNdEN_nrps68emephufQRSP1YF2RQs/view

Consider the following variable declarations and initializations.

Which expression evaluates to false?

•  

  a < b == c < b

• a < b == b < c

Answer explanation

https://drive.google.com/file/d/1t2gjxVTNSmLiCORFXnxYshzChENmjxKW/view

• daysMissed is 6, gpa 3.5

• daysMissed is 4, gpa 3.0

• daysMissed is 5, gpa 2.5

• daysMissed is 6, gpa 3.0

Answer explanation

https://drive.google.com/file/d/1qtJ-sYc0bzvwIHF43bhWUWj0i_1N5cPg/view

Consider the following variable declarations and initializations.

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

• a == b

• false

• true

• 10 == 10

Answer explanation

https://drive.google.com/file/d/1ySeh0xoRKgmZBqoRda-myreU5U6rMuwG/view

Consider the following statement.

What is the value of z after the statement has been executed?

• 9

• 6

• true

• false

Answer explanation

https://drive.google.com/file/d/1KQ3LBOmNLODb1U3WzpOQZ0_SW2Y31ZGH/view

Consider the following Boolean expression in which the int variables x and y have been properly declared and initialized..

Which expression below is equivalent to the one above?

Answer explanation

https://drive.google.com/file/d/13BTedCk15tfnp-r8xZB_o79mQobmxfbk/view

Consider the following code segment.

Select the correct missing code that will make z evaluate to true?

• a <- true
  b <- false
  c <- true
  d <- false

• a <- false
  b <- false
  c <- false
  d <- false

• a <- false
  b <- true
  c <- false
  d <- true

•  

  a <- true
  b <- true
  c <- false
  d <- false

Answer explanation

https://drive.google.com/file/d/1U3nlBGH7MpgB0qXLh2NrnDx_cmwhO8QB/view

Consider the following code segment.

What output is produced when this code segment is executed?

• false true

• true false

• false false

• true true

Answer explanation

https://drive.google.com/file/d/169nLBdsZnCx-WncVyxM3Df0nPS0HY8ng/view

Consider the following Boolean expression in which the int variables x and y have been properly declared and initialized.

Which expression below is equivalent to the one above?

• (x == y) and (y < z)

Answer explanation

https://drive.google.com/file/d/1cf2r0K5qm6HkeP5EZ3X42FHTapoZZETg/view

In the following expression, windy and raining are properly declared and initialized.boolean variables.

not windy and not raining

Which expression below is equivalent to the one above?

• not(windy and raining)

• not windy or not raining

• windy or raining

• not(windy or raining)

Answer explanation

https://drive.google.com/file/d/1O5A9bGC4a5pXRlFuzh9t69zxsO9EgL4x/view