Peer Instruction: Inheritance Multiple Choice Questions

Q-1: In the following pairs of words, the first is the subclass and the second is the superclass. Which of them is a correct example of inheritance?

• dog, cat
• Try again. Dog and cat are both the subclass of animal.
• dog, animal
• Correct! Dog is the subclass of animal.
• animal, dog
• Try again. Dog is the subclass of animal and the question wants the first is subclass.
• dog, tail
• Try again. Tail is a part of the dog but it does not belong to the subclass.
• None of the above
• Try again. There is one answer correct. Try to think about the relationship between category and subcategory.

Q-2: In the following pairs of words, the first is the subclass and the second is the superclass. Which of them is a correct example of inheritance?

• school, building
• Correct! School is the subclass of building.
• school, student
• Try again. School is an object but student is not.
• student, school
• Try again. School is an object but student is not.
• school, computer
• Try again. School is a building but computer is not.
• None of the above
• Try again. There is one answer correct. Try to think about the relationship between category and subcategory.

Q-3: What is the output of this code?

class A(object):
  def __init__(self, x):
      self.x = x

  def __str__(self):
      return str(self.x)

class B(A):
  def __init__(self, x):
  self.x = x * 2

b = B(5)
print(b)

• 5
• Try again. A is defined by the first class, which returns self.x. self.x equals to x, so class B inherits A whose value is 5. B(5) = 5 * 2 = 10.
• 10
• Correct! Class B inherits A, whose value is 5. B(5) = 5 * 2 = 10.
• 510
• Try again. A is defined by the first class, which returns self.x. self.x equals to x, so class B inherits A whose value is 5. B(5) = 5 * 2 = 10.
• 105
• Try again. A is defined by the first class, which returns self.x. self.x equals to x, so class B inherits A whose value is 5. B(5) = 5 * 2 = 10.

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