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Consider the following statements regarding life time of any normally terminating process in an operating system. (I) The process must be in RUNNING state at least once during its execution. (II) The process must be in RUNNING state at least twice during its execution. (III) The process must be in WAITING state at least once during its execution. (IV) The process must be in READY state at least once during its execution. Which of the above statements are correct?
In a town fair 50 people were asked which dessert they liked: ice cream, Donuts, or cupcakes. 28 said they like ice cream, 26 said they like donuts, and 26 said they like cupcakes. 8 said they like all three. 17 said they like donuts and cupcakes, 11 said they like ice cream and cupcakes. 5 said they do not like any of these. Find those people who liked ice cream and donuts but not cupcakes.
If 'banana' is said 'apple', 'apple' is said 'grapes', 'grapes' is said 'mango', 'mango' is said 'cashew', 'cashew' is said 'guava', 'guava' is said 'papaya' then which fruit is known as the king of fruits?
The following are some events that occur after a device controller issues an interrupt while process L is under execution? (P) The processor pushes the process status onto the control stack. (Q) The processor finishes the execution of the current instruction. (R) The processor executes the interrupt service routine. (S) The processor pops the process status of from the control stack. (T) The processor loads the new PC value based on the interrupt. Which one of the following is the correct order in which the events above occur?
Three concurrent processes X, Y, and Z execute three different code segments that access and update certain shared variables. Process X executes the P operation (i.e., wait) on semaphores a, b and c; process Y executes the P operation on semaphores b, c and d; process Z executes the P operation on semaphores c, d, and a before entering the respective code segments. After completing the execution of its code segment, each process invokes the V operation (i.e., signal) on its three semaphores. All semaphores are binary semaphores initialized to one. Which one of the following represents a deadlock-free order of invoking the P operations by the processes?
If a higher priority process arrives and wants service, the memory manager can swap out the lower priority process to execute the higher priority process. When the higher priority process finishes, the lower priority process is swapped back in and continues execution. This variant of swapping is sometimes called?
The distance between two station A and B is 1000 km. A train starts from A and moves towards B at an average speed of 60 km/hr. Another train starts from B, 2 hours later than the train from A, and moves towards A at an average speed of 50 km/hr. When will the two trains cross each other after A starts journey?
A and B starts from a point C towards D with a speed of 40 km/h and 45 km/h respectively, If  A starts at 8 a.m. and B starts at 9 a.m., then at what time will B catch A? 
The distance between two points X and Y is 480 km. Train A starts from X and train B starts from Y and meet at the point W, which is 180 km away from X. If, Train A starts two hour earlier than train B, then in what time (in hour) train B reaches point W? (Assume speeds of X and Y are same )
Alok starts walking from P with a speed of 6 km/h towards Q. Raman starts time from P towards Q with a speed of 9 km/h. Raman reaches Q, turns back and starts walking towards P. He meets Alok at R. If PQ is 15 km, then what is PR?