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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
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.
In a group of 50 students who either want to join defence forces or paramilitary forces, out of which 40 students want to join defence forces and 30 want to join paramilitary forces. Find the number of students who want to join only defence forces.
Consider the following two tables and four queries in SQL. Book (isbn, bname), Stock (isbn, copies) Query 1: SELECT B.isbn, S.copies FROM Book B INNER JOIN Stock S ON B.isbn = S.isbn;   Query 2: SELECT B.isbn, S.copies FROM Book B LEFT OUTER JOIN Stock S ON B.isbn = S.isbn; Query 3: SELECT B.isbn, S.copies FROM Book B RIGHT OUTER JOIN Stock S ON B.isbn = S.isbn;   Query 4: SELECT B.isbn, S.copies FROM Book B FULL OUTER JOIN Stock S ON B.isbn = S.isbn;   Which one of the queries above is certain to have an output that is a superset of the outputs of the other three queries?
In class, students want to join sports. 15 people will join football, 24 people will join basketball, and 7 people will join both. How many people are there in the class?
A UNIX user named Bob wants to replace his chess program with a new one, but he is not sure where the old one is installed. Bob is currently able to run a Java chess program starting from his home directory /home/bob using the command: java -classpath /test:/home/bob/downloads/*.jar games.Chess Bob's CLASSPATH is set (at login time) to: /usr/lib:/home/bob/classes:/opt/java/lib:/opt/java/lib/*.jar What is a possible location for the Chess.class file?
What is the Message is displayed in the applet made by the following Java program?
import java.awt.*;import java.applet.*;public class myapplet extends Applet{ public void paint(Graphics g) { g.drawString("A Simple Applet", 20, 20); }}
What is the length of the application box made by the following Java program?
import java.awt.*;import java.applet.*;public class myapplet extends Applet{ public void paint(Graphics g) { g.drawString("A Simple Applet", 20, 20); }}