Question
Average weight of a team of 8 persons is 50 kg. When one
more person joins the team, the average weight of the team increases by 7 kg. Find the weight of new personSolution
Sum of weights of 8 persons = 50 × 8 = 400 kg Sum of weights of 9 persons = (50 + 7) × 9 = 513 kg Weight of new person = 513 – 400 = 113 kg
In a relational database, what is a candidate key?
In two-phase locking, a transaction releases its locks:
Which of the following is a non-relational database?
Which of the following is a type of phishing attack?
Which interrupt is generated by software?
Which of the following illustrates an advantage of DBMS over traditional file systems?
Which deadlock prevention scheme allows older transactions to preempt younger ones?
Which database model represents data in a tree-like structure, where each child record has only one parent?
Which SQL command is used to retrieve data from a table?
Which constraint ensures that a column contains only unique values, but allows NULL values?
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