CS GATE 2009 - Online Test
Q1. Which one of the following is the most appropriate logical formula to represent the statement
“Gold and Silver ornaments are precious”
The following notations are used:
G(x): x is a gold ornament
S(x): x is a silver ornament
P(x): x is precious
Answer : Option D
Explaination / Solution:
No Explaination.
Q2. The binary operation ∨ is defined as follows ;
Which one of the following is equivalent to P∨Q?
Answer : Option B
Explaination / Solution:
No Explaination.
Q3. 
evaluates to
evaluates to
Answer : Option D
Explaination / Solution:
No Explaination.
Q4. Consider the following well-formed formulae:
Which of the above are equivalent?
Answer : Option B
Explaination / Solution:
No Explaination.
Q5. Consider n disk system with 100 cylinders. The requests to access the cylinders occur in the following
sequence:4, 34, 10, 7, 19, 73, 2, 15, 6, 20
Assuming that the head is currently at cylinder 50, what is the time taken to satisfy all requests if it
takes 1 ms to move from one cylinder to adjacent one and shortest seek time first policy is used?
Answer : Option B
Explaination / Solution:
No Explaination.
Q6.
A hard disk has 63 sectors per track, 10 platters each with 2 recording surfaces and 1000 cylinders. The address of a sector is given as a triple〈c, h, s〉, where c is the cylinder number, h is the surface number and s is the sector number. Thus, the 0th sector is addressed as 〈 0, 0, 0〉 , the 1st sector as 〈 0, 0, 1〉 and so on.
The address 〈400, 16, 29〉 corresponds to sector number:
Answer : Option C
Explaination / Solution:
No Explaination.
Q7.
A hard disk has 63 sectors per track, 10 platters each with 2 recording surfaces and 1000 cylinders. The address of a sector is given as a triple〈c, h, s〉, where c is the cylinder number, h is the surface number and s is the sector number. Thus, the 0th sector is addressed as 〈 0, 0, 0〉 , the 1st sector as 〈 0, 0, 1〉 and so on.
The address of 1039th sector is
Answer : Option C
Explaination / Solution:
No Explaination.
