The data structure required to check whether an expression contains a balanced parenthesis is?
a) Queue
b) Stack
c) Tree
d) Array
Computer Science MCQS
Computer Science MCQ with detailed explanations for students & freshers preparing for entrance exams, various tests, interviews, competitive exams like GATE exam, interview, competitive examination and entrance exam.
Which data structure is used for implementing recursion?
a) Stack
b) Queue
c) List
d) Array
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What are the disadvantages of arrays?
a) Index value of an array can be negative
b) Elements are sequentially accessed
c) Data structure like queue or stack cannot be implemented
d) There are chances of wastage of memory space if elements inserted in an array are lesser than the allocated size
What is a data structure?
a) A programming language
b) A collection of algorithms
c) A way to store and organize data
d) A type of computer hardware
Answer:
c) A way to store and organize data
_____ operations do not preserve non-matched tuples.
a) Left outer join
b) Inner join
c) Natural join
d) Right outer join
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Procedural language among the following is __
a) Domain relational calculus
b) Tuple relational calculus
c) Relational algebra
d) Query language
Which of the following command is correct to delete the values in the relation teaches?
a) Delete from teaches;
b) Delete from teaches where Id =’Null’;
c) Remove table teaches;
d) Drop table teaches;
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Which of the following set should be associated with weak entity set for weak entity to be meaningful?
a) Neighbour set
b) Strong entity set
c) Owner set
d) Identifying set
Which command is used to remove a relation from an SQL?
a) Drop table
b) Delete
c) Purge
d) Remove
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