1
GATE CSE 2016 Set 1
+1
-0.3
Which of the following is NOT a superkey in a relational schema with attributes $$V, W, X, Y, Z$$ and primary key $$V Y?$$
A
$$VXYZ$$
B
$$VWXZ$$
C
$$VWXY$$
D
$$VWXYZ$$
2
GATE CSE 2016 Set 1
+2
-0.6
Consider the following two phase locking protocol. Suppose a transaction $$T$$ accesses (for read or write operations), a certain set of objects $$\left\{ {{O_1},...,{O_k}} \right\}.$$ This is done in the following manner:

Step 1. T acquires exclusive locks to $${{O_1},...,{O_k}}$$ in increasing order of their
Step 2. The required operations are performed.
Step 3. All locks are released.

This protocol will

A
B
C
D
3
GATE CSE 2016 Set 1
Numerical
+1
-0
We want to design a synchronous counter that counts the sequence $$0-1-0-2-0-3$$ and then repeats. The minimum number of $$J-K$$ flip-flops required to implement this counter is _________.
4
GATE CSE 2016 Set 1
+1
-0.3
Consider the Boolean operator $$\ne$$ with the following properties:
$$x \ne 0 = x,\,\,x \ne 1 = \overline x ,\,\,x \ne x = 0$$ and $$x \ne \overline x = 1.$$ Then $$x \ne y$$ is equivalent to
A
$$x\overline y + \overline x y$$
B
$$x\overline y + \overline x \overline y$$
C
$$\overline x y + xy$$
D
$$xy + \overline x \overline y$$
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