PCEP-30-02 1.4 Choose Operators and Data Types Adequate to the Problem PCEP-30 Practice Questions (Page 3)

Questions 11–15

1. 11foundation · easy

   Why might the expression 0.1 + 0.2 not equal 0.3 in Python?

   • ABecause floating-point numbers are stored in binary and cannot represent some decimal values exactly.
   • BBecause Python rounds all floating-point numbers to the nearest integer.
   • CBecause the + operator is not defined for floating-point numbers.
   • DBecause Python uses a different number system for decimal calculations.
   Reveal Solution Discussion Select an answer first
2. 12application · medium

   A developer is evaluating the expression `2 + 3 * 4 ** 2` to use in a calculation. What is the result of this expression?

   • A80
   • B400
   • C98
   • D50
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4. 13foundation · easy

   What is the result of the expression 'Py' + 'thon'?

   • A'Python'
   • B'Py' + 'thon'
   • C'Py thon'
   • D'Py' 'thon'
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5. 14foundation · easy

   What is the output of the following code? print('ab' * 3)

   • Aab*3
   • Baaa bbb
   • Cababab
   • Dab3
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6. 15foundation · easy

   Which of the following is a consequence of the limited precision of floating-point numbers?

   • AFloating-point numbers are always exact.
   • BSome calculations may produce results that are slightly different from the mathematically expected value.
   • CFloating-point numbers cannot be used in arithmetic operations.
   • DFloating-point numbers can only store integers.
   Reveal Solution Discussion Select an answer first