Which of the following refers to a cursor type that when the cursor is opened, a primary key value is saved for each row in the recordset; when the application accesses a row, the key is used to fetch the current values of the row?
The necessary conditions needed before deadlock can occur?
Options: Â No Mutual Exclusion, Hold and wait, Preemption, Circular Wait
B. Â Mutual Exclusion, No Hold and wait, Preemption, Circular Wait
C. Â Mutual Exclusion, Hold and wait, No Preemption, Circular Wait
D. Â Mutual Exclusion, Hold and wait, Preemption, No Circular Wait
Ans:– C ,
A device invented by Dr. Bobeck in 1966, for mass storage of data is
Options: Punched paper tape, Magnetic bubble storage, Magnetic tape, Magnetic disk
Options: a feature of data processing systems that allows for the study of data as processed from step to step; and auditor can then trace all transactions that affect an account., a data item that characterizes an object, two or more data items handled as a unit, All of the above
. All of the following are task performed by the operating system except
Options: a. Managing hardware on the computer
b. Controlling the access that application program has to the CPU
c. Performing housekeeping task like file compression and disk defragmentation
d. Provides an interface for user to interact with computer
Which one of the following principles best describes the basic operation of an electromagnet?
Options: Current is induced in a conductor that is moving through a magnetic field, Like magnetic poles repel, while unlike poles attract, Current flowing through a conductor generates a magnetic field, Like magnetic poles attract, while unlike poles repel