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.