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Computer Interview Questions Answers

Computer Interview Questions Answers

Question - 51 : - command sets a file's permission in Linux?

Answer - 51 : -  chmod

Question - 52 : - Should I turn off my computer or put it to sleep?

Answer - 52 : - This question can invoke quite a bit of debate, but my short answer is to put the computer to sleep each night or any time you leave the computer for more than 15 minutes. If you are not going to use the computer for more than a day (such as leaving it for the weekend), it is best to turn the computer off. Idle 15 minutes to 24 hours: Sleep Idle 24 hours or more: Shut Down When a computer is in "sleep" or "standby" mode, it consumes almost no energy, so the difference between letting it sleep overnight or turning it off during the night is negligible. However, if you have a laptop running off a battery charge, the difference may be noticeable. I have noticed that my laptop's battery life only lasts about five to six days in sleep mode, but will last for weeks if the computer is off. Therefore, if you are not going to be using your laptop for more than a few hours and do not have AC power available, it is best to turn the computer off. The most important way to save energy is to not leave the computer running normally when you are not using it. I have my computer set to automatically sleep if it is idle for 15 minutes and my screen dims after 5 minutes. This way, I know that I won't accidentally leave my computer running for a long period of time. I also put my computer to sleep manually if I know I am going to be taking a break for more than 15 minutes. Finally, if you put your computer to sleep every night and hardly ever turn if off, it may be good to at least restart the computer every few weeks. This may help improve performance in case some errant processes are consuming unnecessary RAM or CPU time.

Question - 53 : - What is destination ?

Answer - 53 : - A JMS administered object that encapsulates the identity of a JMS queue or topic. See point-to-point messaging system, publish/subscribe messaging system.

Question - 54 : - Can I fax a document without a fax machine?

Answer - 54 : - There are a number of fax programs available for faxing documents electronically using your computer's modem, or simply through the Internet. Some popular fax programs include FaxSTF (Mac) and Fax Wizard (Windows). These programs allow you to fax electronic documents such as Word documents or documents you scan into your computer. I would suggest visiting Download.com for a shareware fax program if you don't have one or visiting eFax.com for more information.

Question - 55 : - What is the maximum transfer speed of the wireless 802.11a standard?

Answer - 55 : - 54 Mbps is the maximum transfer speed of this standard

Question - 56 : - What is the reserve command?

Answer - 56 : - Reverse Command :Reverse N Lines : if there is not enough space left on the current page for atleast n lines it starts a new page RESERVE If insufficient space is there for listing output reserve statement encounters NEW-PAGE.But before going to new page it processes END-OF-PAGE.  

Question - 57 : - CD-ROM stands for?

Answer - 57 : - Compact Disk Read Only Memory.

Question - 58 : - Are e-mail addresses case sensitive?


Question - 59 : - What is DTD ?  

Answer - 59 : - Document type definition. An optional part of the XML document prolog, as specified by the XML standard. The DTD specifies constraints on the valid tags and tag sequences that can be in the document. The DTD has a number of shortcomings, however, and this has led to various schema proposals. For example, the DTD entry says that the XML element called username contains parsed character data-that is, text alone, with no other structural elements under it. The DTD includes both the local subset, defined in the current file, and the external subset, which consists of the definitions contained in external DTD files that are referenced in the local subset using a parameter entity.

Question - 60 : - What is the difference between Bluetooth and Infrared technology?

Answer - 60 : - Infrared technology is what most TV remotes use. The distance an infrared signal can travel varies based on the strength of the remote, but is usually less than 50 feet for household electronics. In order for an infrared signal to be detected, there must be a direct line of sight between the transmitter (remote) and the receiver (TV). If there is a wall or large object between them, the signal will not pass through it. Bluetooth, on the other hand, uses a radio frequency, which allows transmission through walls and other objects. The standard range of a Class 3 Bluetooth device is about 30 ft., which makes it ideal for syncing PDAs with computers, using wireless cell phone headsets, and enabling handsfree cell phone use inside Bluetooth-enabled automobiles. Because Bluetooth technology is based on a standard 2.4 GHz frequency, different Bluetooth devices can typically communicate with each other, regardless of the manufacturer. Most infrared devices only work with proprietary equipment. While Bluetooth is well on its way to replacing infrared in many different areas, the technology is not meant to be used for wireless networking. Instead, Wi-Fi technology, which has a larger range and higher bandwidth than Bluetooth, is the standard that most wireless networking equipment uses.

Computer Contributors

Rajeev Katiyar
Yes Baroda

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