| 21. | Which type of inheritance results in diamond problem? |
| a. | Single level |
| b. | Hybrid |
| c. | Hierarchical |
| d. | Multilevel |
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Answer: (b).Hybrid
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| 22. | If 6 classes uses single level inheritance with pair classes (3 pairs), which inheritance will this be called? |
| a. | Single |
| b. | Multiple |
| c. | Hierarchical |
| d. | Multilevel |
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Answer: (a).Single
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| 23. | Which among the following is correct for the following code?
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| a. | Multi-level inheritance is used, with nested classes |
| b. | Multiple inheritance is used, with nested classes |
| c. | Single level inheritance is used, with enclosing classes |
| d. | Single level inheritance is used, with both enclosing and nested classes |
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Answer: (d).Single level inheritance is used, with both enclosing and nested classes
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| 24. | Which among the following is false? |
| a. | If one class inherits the inherited class in single level inheritance, it is multi-level inheritance |
| b. | Hybrid inheritance always contains multiple inheritance |
| c. | Hierarchical inheritance involves inheriting same class into more than one classes |
| d. | Hybrid inheritance can involve any types of inheritance together |
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Answer: (b).Hybrid inheritance always contains multiple inheritance
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| 25. | If class A has two nested classes B and C. Class D has one nested class E, and have inherited class A. If E inherits B and C, then: |
| a. | It shows multiple inheritance |
| b. | It shows hierarchical inheritance |
| c. | It shows multiple inheritance |
| d. | Multiple inheritance among nested classes, and single level for enclosing classes |
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Answer: (d).Multiple inheritance among nested classes, and single level for enclosing classes
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| 26. | In hierarchical inheritance, all the classes involve some kind of inheritance. (True/ False) |
| a. | True |
| b. | False |
| c. | May be |
| d. | Can't say |
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Answer: (b).False
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| 27. | Which type of inheritance cannot involve private inheritance? |
| a. | Single level |
| b. | Multiple |
| c. | Hybrid |
| d. | All types can have private inheritance |
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Answer: (d).All types can have private inheritance
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| 28. | How many classes can be inherited by a single class in multiple inheritance (C++)? |
| a. | Only 2 |
| b. | Only 27 |
| c. | Only 1024 |
| d. | Any number of classes can be inherited |
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Answer: (d).Any number of classes can be inherited
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| 29. | How many classes can be inherited by a single class in java? |
| a. | Only 1 |
| b. | Only 27 |
| c. | Only 255 |
| d. | Only 1024 |
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Answer: (a).Only 1
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| 30. | If multi-level inheritance is used, First class B inherits class A, then C inherits B and so on. Till how many classes can this go on? |
| a. | Only till class C |
| b. | Only till class J |
| c. | Only till class Z |
| d. | There is no limit |
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Answer: (d).There is no limit
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