Related InterviewSolutions

• What is the output of the following JAVA program ?class simple{public static void main(String[ ] args){simple obj = new simple( );obj.start( );}void start( ){long [ ] P= {3, 4, 5};long [ ] Q= method (P);System.out.print (P[0] + P[1] + P[2]+”:”);System.out.print (Q[0] + Q[1] + Q[2]);}long [ ] method (long [ ] R){R [1]=7;return R;}} //end of class(A) 12 : 15(B) 15 : 12(C) 12 : 12(D) 15 : 15
• The hexadecimal equivalent of the binary integer number 110101101 is:(A) D24(B) 1BD(C) 1AE(D) 1AD
• What does the following logic diagram represent?(A) Synchronous Counter(B) Ripple Counter(C) Combinational Circuit(D) Mod 2 Counter
• In a paged memory, the page hit ratio is 0.40. The time required to access a page in secondary memory is equal to 120 ns. The time required to access a page in primary memory is 15 ns. The average time required to access a page is ________.(A) 105(B) 68(C) 75(D) 78
• In a multi-user operating system, 30 requests are made to use a particular resource per hour, on an average. The probability that no requests are made in 40 minutes, when arrival pattern is a poisson distribution, is _________.(A) e-15(B) 1 – e-15(C) 1 – e-20(D) e-20
• At a particular time of computation, the value of a counting semaphore is 10. Then 12 P operations and “x” V operations were performed on this semaphore. If the final value of semaphore is 7, x will be:(A) 8(B) 9(C) 10(D) 11
• Normally user programs are prevented from handling I/O directly by I/O instructions in them. For CPUs having explicit I/O instructions, such I/O protection is ensured by having the I/O instructions privileged. In a CPU with memory mapped I/O, there is no explicit I/O instruction. Which one of the following is true for a CPU with memory mapped I/O ?(A) I/O protection is ensured by operating system routines.(B) I/O protection is ensured by a hardware trap.(C) I/O protection is ensured during system configuration.(D) I/O protection is not possible.
• Which UNIX/Linux command is used to make all files and sub-directories in the directory “progs” executable by all users ?(A) chmod− R a+x progs(B) chmod −R 222 progs(C) chmod−X a+x progs(D) chmod −X 222 progs
• In Java, which of the following statements is/are True?S1 : The ‘final’ keyword applied to a class definition prevents the class from being extended through derivation.S2 : A class can only inherit one class but can implement multiple interfaces.S3 : Java permits a class to replace the implementation of a method that it has inherited. It is called method overloading.Code:(A) S1 and S2 only(B) S1 and S3 only(C) S2 and S3 only(D) All of S1, S2 and S3
• Which of the following statements is/are True?P : C programming language has a weak type system with static types.Q : Java programming language has a strong type system with static types.Code:(A) P only(B) Q only(C) Both P and Q(D) Neither P nor Q