Most hardware architectures provide an instruction to return from a interrupt, such as iret. This instruction switches the mode of operation from kernel-mode to user-mode. a) Explain where in the operating system this instruction would be b) Explain what happens if an application program executes this in- used. struction.

To remove a header or footer from a document you can open the header and footer and manually delete the content true or false

3. what is the output of the following statements? temporary object1; temporary object2("rectangle", 8.5, 5); temporary object3("circle", 6, 0); temporary object4("cylinder", 6, 3.5); cout < < fixed < < showpoint < < setprecision(2); object1.print(); object2.print(); object3.print(); object4.print(); object1.set("sphere", 4.5, 0); object1.print();

An npn transistor is correctly biased and turned on if the a. base is negative. b. collector is negative. c. collector is positive with respect to the emitter and negative with respect to the base. d. collector is the most positive lead followed by the base.