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PCEP-30-02 Exam Prep: Mastering Bitwise Operators and Data Types

PCEP Certification Practice Test - Questions, Answers and Explanations

This comprehensive set of questions and explanations covers the topic of choosing operators and data types with a focus on bitwise operators. These exercises are designed to enhance understanding and prepare you for the PCEP-30-02 examination.

Question 1: What is the result of the following expression?

result = 5 & 3
print(result)
  1. 7
  2. 3
  3. 1
  4. 0
▼

Answer: c) 1

Explanation: The & (bitwise AND) operator compares each bit of its operands. The binary representation of 5 is 101, and 3 is 011. Performing a bitwise AND results in 001, which equals 1 in decimal.

Question 2: Evaluate the following expression:

result = 12 | 5
print(result)
  1. 15
  2. 13
  3. 9
  4. 7
▼

Answer: a) 13

Explanation: The | (bitwise OR) operator compares each bit of its operands. The binary representation of 12 is 1100, and 5 is 0101. Performing a bitwise OR results in 1101, which equals 13 in decimal.

Question 3: What is the result of the following expression?

result = ~10
print(result)
  1. -11
  2. 10
  3. -10
  4. 11
▼

Answer: a) -11

Explanation: The ~ (bitwise NOT) operator inverts all the bits of its operand. The binary representation of 10 is 1010, and inverting the bits gives ...11110101, which represents -11 in two's complement form.

Question 4: What is the result of the following expression?.

result = 8 >> 2
print(result)
  1. 2
  2. 4
  3. 8
  4. 1
▼

Answer: b) 2

Explanation: The >> (right shift) operator shifts the bits of 8 (1000 in binary) two positions to the right, resulting in 10, which is 2 in decimal.

Question 5: What will be the result of the following operation?

result = 4 << 1
print(result)
  1. a
  2. 2
  3. 4
  4. 16
▼

Answer:a) 8

Explanation: The << (left shift) operator shifts the bits of 4 (100 in binary) one position to the left, resulting in 1000, which is 8 in decimal.

Question 6: Which of the following expressions will result in 7? (Select all that apply).

  1. 5 | 2
  2. 6 & 7
  3. 4 ^ 3
  4. 8 >> 1
▼

Answer:a) 5 | 2, c) 4 ^ 3

Explanation:

  • 5 | 2 gives 7 (binary 101 | 010 = 111).
  • 4 ^ 3 also gives 7 (binary 100 ^ 011 = 111).
  • 6 & 7 results in 6 and 8 >> 1 results in 4.

Question 7: Which of the following operations will result in 0? (Select all that apply).

  1. 7 & 8
  2. 3 ^ 3
  3. ~1
  4. 4 << 2
▼

Answer: a) 7 & 8, b) 3 ^ 3

Explanation: First, assign values to a and b, then compute z and print it.

  • 7 & 8 results in 0 since there are no common set bits.
  • 3 ^ 3 results in 0 because XORing the same number gives 0.
  • ~1 results in -2 and 4 << 2 results in 16.

Question 8: Which expressions use the bitwise XOR operator? (Select all that apply).

  1. result = a ^ b
  2. result = a | b
  3. result = a & b
  4. result = ~a
▼

Answer: a) result = a ^ b

Explanation: The XOR operator is represented by ^ in Python.

Question 9: Fill in the blank with the correct bitwise operator to toggle the bits of a number.

result = ~x
▼

Answer: ~

Explanation: The ~ operator is used to toggle (invert) the bits of a number.

Question 10: To combine two binary numbers using bitwise AND, you would use the ______ operator.

▼

Answer: &

Explanation: The & operator is used to perform a bitwise AND operation.

Question 11: Arrange the following steps in the correct order to perform a bitwise left shift operation:

  • Shift the bits to the left.
  • Append zeros to the right.
  • Determine the number of positions to shift.
▼

Answer:

  • Determine the number of positions to shift.
  • Shift the bits to the left.
  • Append zeros to the right.

Explanation: A left shift operation involves determining the shift count, shifting the bits left, and appending zeros.

Question 12: Fill in the missing code to perform a bitwise OR operation on a and b.

result = a ______ b
▼

Answer: |

Explanation: The | operator is used to perform a bitwise OR operation between a and b.

Question 13: Fill in the missing code to perform a bitwise XOR operation on a and b.

result = a ______ b
▼

Answer: ^

Explanation: The ^ operator is used to perform a bitwise XOR operation between a and b.

Question 14: Sort the following operations to correctly perform a bitwise right shift by 3 positions:

  • Shift the bits to the right.
  • Remove the last three bits.
  • Determine the number of positions to shift.
▼

Answer:

  • Determine the number of positions to shift.
  • Shift the bits to the right.
  • Remove the last three bits.

Explanation: A right shift involves shifting bits right by the specified number of positions, effectively removing the specified number of least significant bits.

Question 15: Insert the appropriate bitwise operator to check if the second bit of x is set.

if x & 0b10 ______ 0b10:
    print("Second bit is set")
▼

Answer: ==

Explanation: The & operator is used to isolate the second bit, and == is used to compare it with 0b10.

Question 16: Insert the appropriate bitwise operation to double the value of y.

y = y ______ 1
▼

Answer: <<

Explanation:The << operator shifts the bits left by one position, effectively doubling the value.

Question 17: What is the result of the following operation?

result = 10 & 7
print(result)
  1. 3
  2. 2
  3. 7
  4. 10
▼

Answer: b) 2

Explanation: The bitwise AND operator (&) compares each bit of the numbers 10 (1010 in binary) and 7 (0111 in binary) and returns 0010 in binary, which is 2 in decimal.

Question 18: What will be the output of this code?

x = 4
y = 1
result = x << y
print(result)
  • 8
  • 5
  • 9
  • 2
▼

Answer: a) 8

Explanation: The left shift operator (<<) shifts the bits of x (which is 4, or 0100 in binary) one place to the left, resulting in 1000, which is 8 in decimal.

Question 19: What is the result of this operation?

result = ~5
print(result)
  • 5
  • -4
  • -6
  • 6
▼

Answer: c) -6

Explanation: The bitwise NOT operator (~) inverts all bits of 5 (which is 0101 in binary), resulting in ...11111010 in binary, which is -6 in decimal (due to two's complement representation).

Question 20: Which of the following results are correct for the bitwise OR (|) operation? (Select all that apply)

a = 3
b = 5
result = a | b
  • 7
  • 8
  • 5
  • 3
▼

Answer: a) 7

Explanation: The bitwise OR (|) compares each bit of 3 (0011 in binary) and 5 (0101 in binary) and results in 0111, which is 7 in decimal.

Question 21: Which of the following outputs can be generated by this code? (Select all that apply)

a = 6
b = 3
result = a ^ b
print(result)
  • 1
  • 5
  • 7
  • 0
▼

Answer: b) 5

Explanation: The bitwise XOR (^) compares each bit of 6 (0110 in binary) and 3 (0011 in binary), resulting in 0101, which is 5 in decimal.

Question 22: Arrange the following binary representations in the correct order to calculate the result of 9 & 5:

  • 0101
  • 1001
  • 0001
▼

Answer:

  • 1001 (binary for 9)
  • 0101 (binary for 5)
  • 0001 (binary result of 9 & 5)

Explanation: The bitwise AND operator (&) compares each bit of 9 and 5, resulting in 0001, which is 1 in decimal.

Question 23: The bitwise left shift operator (<<) shifts bits to the ______, multiplying the number by ______.

▼

Answer: left, 2

Explanation: The left shift operator (<<) shifts the bits of the number to the left and multiplies the number by 2 for each shift.

Question 24: The bitwise OR operator (|) compares each bit and returns 1 if either of the bits is ______.

▼

Answer: 1

Explanation: The OR operator (|) returns 1 if at least one of the corresponding bits is 1.

Question 25: Sort the following steps to correctly calculate the bitwise XOR (^) of 7 and 4:

  • 0100
  • 0111
  • 0011
▼

Answer:

  • 0111 (binary for 7)
  • 0100 (binary for 4)
  • 0011 (binary result of 7 ^ 4)

Explanation: The XOR operator (^) compares each bit of 7 and 4, resulting in 0011, which is 3 in decimal.

Question 26: Fill in the missing code to calculate the result of 15 OR 9.

result = 15 _____ 9
print(result)
▼

Answer: |

Explanation: The bitwise OR (|) compares each bit of 15 (1111 in binary) and 9 (1001 in binary), resulting in 1111, which is 15 in decimal.

Question 27: Fill in the missing code to perform a right shift on 32 by 2 bits.

result = 32 _____ 2
print(result)
▼

Answer: >>

Explanation: The right shift operator (>>) shifts the bits of 32 (100000 in binary) two places to the right, resulting in 1000, which is 8 in decimal.

Question 28: Insert the correct operation to invert all bits of the number 12.

num = 12
result = ______ num
print(result)
▼

Answer: ~

Explanation: The bitwise NOT operator (~) inverts all bits of 12, resulting in ...11110011 in binary, which is -13 in decimal.

Question 29: Insert the appropriate operation to compute the bitwise AND of 7 and 10.

a = 7
b = 10
result = a ______ b
print(result)
▼

Answer: &

Explanation: The bitwise AND operator (&) compares each bit of 7 (0111 in binary) and 10 (1010 in binary), resulting in 0010, which is 2 in decimal.

Question 30: What will be the output of the following code?

x = 12
y = 25
result = x ^ y
print(result)
  • 5
  • 17
  • 21
  • 29
▼

Answer: c) 21

Explanation: The bitwise XOR operator (^) compares each bit of 12 (1100 in binary) and 25 (11001 in binary), resulting in 10101, which is 21 in decimal.

Question 31: What will be the output of this code snippet?

num = 14
result = num >> 1
print(result)
  • 7
  • 28
  • 12
  • 10
▼

Answer: a) 7



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