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User level threads are threads that are visible to the programmer and are unknown to the kernel. The operating system kernel supports and manages kernel level threads. Three different types of models relate user and kernel level threads. Which of the following statements is/are true ? (a) (i) The Many - to - one model maps many user threads to one kernel thread (ii) The one - to - one model maps one user thread to one kernel thread (iii) The many - to - many model maps many user threads to smaller or equal kernel threads (b) (i) Many - to - one model maps many kernel threads to one user thread (ii) One - to - one model maps one kernel thread to one user thread (iii) Many - to- many model maps many kernel threads to smaller or equal user threads
Which of the following statements are true/false?
1. Welfare of labour is item number 21 on the concurrent list.
2. Labour is included in the concurrent list in the seventh schedule of the Indian constitution.
3. Social Security and insurance are item number 24 on the concurrent list.4. Trade Union, industrial and labour disputes are item number 22 of the concurrent list.
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?
A multiprocessing technology which enables software to treat a single processor as two processors to utilize the processing power in the chip that would otherwise go unused and lets the chip operate more efficiently resulting in faster processing is called
Consider the following threads, T1, T2, and T3 executing on a single processor, synchronized using three binary semaphore variables, S1, S2, and S3, operated upon using standard wait() and signal(). The threads can be context switched in any order and at any time. T1 T2 T3 While(true) { Wait(S3); Print(“C”); Signal (S2); } While(true) { Wait(S1); Print(“B”); Signal (S3); } While(true) { Wait(S2); Print(“A”); Signal (S1); }   Which initialization of the semaphores would print the sequence BCABCABCA….?
In context of Java Threads, which of the following statements are true? I: sleep () and yield () are static methods in thread class II: yield () voluntarily relinquishes CPU to other threads. III: Daemon will terminate when all non-Daemon threads terminate.
Three statements are given, followed by three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusion logically follow(s) from the statements. Statements: All threads are needles. Some needles are brushes. All needles are cupboards. Conclusions: I. Some brushes are cupboards. II. All threads are cupboards. III. All brushes are threads.
Statements : All needles are threads. All threads are boxes. All trees are boxes.

Conclusions :
I. No needle is tree.
II. Some trees are threads.
III. Some boxes are needles.
IV. Some trees are needles.
Consider a 32-bit processor which supports 70 instructions. Each instruction is 32 bit long and has 4 fields namely opcode, two register identifiers and an immediate operand of unsigned integer type. Maximum value of the immediate operand that can be supported by the processor is 8191. How many registers the processor has?
Assume that we test the performance of two processors, P1 and P2, on a program. We find the following about each: Processor P1 has a CPI of 2 and executes 2 billion instructions per second. Processor P2 has a CPI of 1 and executes 8 billion instructions per second. Which processor has higher performance on this program? (Recall that CPI stands for Cycles Per Instruction.)