Which of the following blanks the screen or fills it with moving images or patterns when the
computer is not in use?

A.
Debugger

B.
Spider

C.
Screensaver

D.
Cookie

Explanation:

A screensaver is a program initially designed to prevent phosphor burn-in on CRT and plasma
computer monitors by blanking the screen or
filling it with moving images or patterns when the computer is not in use. Modern screensavers are
used primarily for entertainment or
security.
Answer B is incorrect. A spider is an automated program, such as a search engine, indexing
program, or cataloging software. It
requests Web pages much faster than human beings can. A spider is also known as crawler and
robot.
Answer A is incorrect. A debugger is a special application program that is used to find bugs in other
programs. It allows a programmer

to stop a program at any point of time and examine and change the values of the variables. It is the
program execution platform that allows
the following:
Pausing the program execution at any time
Inspecting the values of the program variables
Modifying the values of the program variables
Calling the methods of the program randomly
The steps in debugging are as follows:
1.Gather data
2.Develop a hypothesis
3.Perform experiments
4.Predict new facts
5.Prove or disprove the hypothesis
Answer D is incorrect. Cookie is a block of data, which a Web server stores on the client computer. If
no expiration date is set for the
cookie, it expires when the browser closes. If the expiration date is set for a future date, the cookie
will be stored on the client’s disk after the
session ends. If the expiration date is set for a past date, the cookie is deleted.