ISRO CS 2014

Question 51

Consider the logic circuit given below. The inverter, AND and OR gates have delays of 6, 10 and 11 nanoseconds respectively. Assuming that wire delays are negligible, what is the duration of glitch for Q before it becomes stable?

• 5
• 11
• 16
• 17

Question 52

The conic section that is obtained when a right circular cone is cut through a plane that is parallel to the side of the cone is called

• parabola
• hyperpola
• circle
• ellipse

Question 53

An IP packet has arrived with the first 8 bits as 0100 0010. Which of the following is correct?

• The number of hops this packet can travel is 2.
• The total number of bytes in header is 16 bytes
• The upper layer protocol is ICMP
• The receiver rejects the packet

Question 54

Which of the following is not valid Boolean algebra rule?

• X.X = X
• (X + Y).X = X
• X ̄ + XY = Y
• (X + Y).(X + Z) = X + YZ

Question 55

A supernet has a first address of 205.16.32.0 and a supernet mask of 255.255.248.0. A router receives 4 packets with the following destination addresses. Which packet belongs to this supernet?

• 205.16.42.56
• 205.17.32.76
• 205.16.31.10
• 205.16.39.44

Question 56

Which of the following is FALSE with respect to possible outcomes of executing a Turing Machine over a given input?

• it may halt and accept the input
• it may halt by changing the input
• it may halt and reject the input
• it may never halt

Question 57

Suppose you are browsing the world wide web using a web browser and trying to access the web servers. What is the underlying protocol and port number that are being used?

• UDP, 80

• TCP, 80

• TCP, 25

• UDP, 25

Question 58

A mechanism or technology used in Ethernet by which two connected devices choose common transmission parameters such as speed, duplex mode and flow control is called

• Autosense
• Synchronization
• Pinging
• Auto negotiation

Question 59

Consider the following sorting algorithms. 
I. Quicksort 
II. Heapsort 
III. Mergesort 
Which of them perform in least time in the worst case?

• I and II only

• II and III only

• III only

• I, II and III

Question 60

Consider the following table < img src = "https://www.cdn.geeksforgeeks.org/wp-content/uploads/ISRO64.png "> The table is in which normal form?

• First Normal Form
• Second Normal Form
• Third Normal Form but not BCNF
• Third Normal Form but not BCNF