GATE | GATE-CS-2002 | Question 46

Which combination of the following features will suffice to characterize an OS as a multi-programmed OS?

(a) More than one program may be loaded into main memory 
   at the same time for execution. 
(b) If a program waits for certain events such as I/O, 
   another program is immediately scheduled for execution. 
(c) If the execution of program terminates, another program 
   is immediately scheduled for execution. 

(A) a
(B) a and b
(C) a and c
(D) a, b and c


Answer: (B)

Explanation:

(a) More than one program may be loaded into main memory 
   at the same time for execution. 
True: Only done in a multiprogrammed OS, not in single
       programmed OS

(b) If a program waits for certain events such as I/O, 
   another program is immediately scheduled for execution.
True: Only done in a multiprogrammed OS, not in single
       programmed OS
 
(c) If the execution of program terminates, another program 
   is immediately scheduled for execution. 
False: Done in both Multiprogrammed and single
       programmed OSs


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