OS X El Capitan is the twelfth major release of OS X for Mac computers. It was released on September 30, 2015. Some users have reported an issue where Mac refuses to finish booting after updating to OS X EL Capitan. If your Mac will not start up, stalls on a gray screen with an Apple logo, here is how you troubleshoot. The possible reasons why Mac screen goes black could be listed as follows: 1. Running out of battery is one of the most common reasons why your Mac screen goes blank. Even if your Mac is plugged in, a bad battery or a faulty cable can stop your Mac from charging and thus the Mac showsss black screen and becomes unresponsive. The 'classic' Mac OS is the original Macintosh operating system that was introduced in 1984 alongside the first Macintosh and remained in primary use on Macs until the introduction of Mac OS X in 2001. Apple released the original Macintosh on January 24, 1984; its early system software was partially based on the Lisa OS and the Xerox PARC Alto computer, which former Apple CEO Steve Jobs. Call of Duty Cold War Mac OS X has three modes: Campaign, Multiplayer and Zombies. If you are a COD fan you already know the features of each one. Download now this impressive FPS for Mac and enjoy the 1980’s Cold War between U.S. Call of Duty Black Ops: Cold War is set between the events from Black Ops and Black Ops 2. On your Mac's built-in-keyboard, press the (left-side) Shift-Control-Option keys and the power button at the same time. Release all the keys and the power button at the same time. Press the power button to turn on the computer. Note: While performing this procedure, the status of the indicator light on the MagSafe charger may change.
1) Which of the following is not an operating system?
Windows
Linux
Oracle
DOS
Answer: (c) Oracle
Explanation: Oracle is an RDBMS (Relational Database Management System). It is known as Oracle Database, Oracle DB, or Oracle Only. The first database for enterprise grid computing is the Oracle database. In temperance ruin mac os.
2) What is the maximum length of the filename in DOS?
4
5
8
12
Answer: (c) 8
Explanation: The maximum length of the filename is 8 characters in the DOS operating system. It is commonly known as an 8.3 filename.
3) When was the first operating system developed?
1948
1949
1950
1951
Answer: (c) 1950
Explanation: The first operating system was developed in the early 1950's. It was also called a single-stream batch processing system because it presented data in groups.
4) When were MS windows operating systems proposed?
Explanation: The first MS Windows operating system was introduced in early 1985.
5) Which of the following is the extension of Notepad?
.txt
.xls
.ppt
.bmp
Answer: (a) .txt
Explanation: The .txt file extension is a standard text document extension that contains the unformatted text. It is the default file extension for the notepad.
6) What else is a command interpreter called?
prompt
kernel
shell
command
Answer: (c) shell
Explanation: The command interpreter is also called the shell.
Explanation: The FAT stands for File allocation table. The FAT is a file system architecture. It is used in computer systems and memory cards. A FAT of the contents of a computer disk indicates which field is used for which file.
8) BIOS is used?
By operating system
By compiler
By interpreter
By application software
Answer: (a) By operating system
Explanation: BIOS is used by the operating system. It is used to configure and identify the hardware in a system such as the hard drive, floppy drive, optical drive, CPU, and memory.
9) What is the mean of the Booting in the operating system?
Restarting computer
Install the program
To scan
To turn off
Answer: (a) Restarting computer
Explanation: Booting is a process of the restart the computer. After restarting it, there is no software in the computer's main memory.
10) When does page fault occur?
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The page is present in memory.
The deadlock occurs.
The page does not present in memory.
The buffering occurs.
Answer: (c) The page does not present in memory.
Explanation: Page faults occur when a process tries to access a block page of the memory and that page is not stored in RAM (Read only memory) or memory.
11) Banker's algorithm is used?
To prevent deadlock
To deadlock recovery
To solve the deadlock
None of these
Answer: (a) To prevent deadlock
Explanation: Banker's algorithm is used to prevent the deadlock condition. The banker algorithm is sometimes called the detection algorithm. It is named the banker algorithm because it is used to determine whether a loan can be granted in the banking system or not.
12) When you delete a file in your computer, where does it go?
Recycle bin
Hard disk
Taskbar
None of these
Answer: (a) Recycle bin
Explanation: When you delete a file on your computer device, it is transferred to your computer system's recycle bin or trash.
13) Which is the Linux operating system?
Private operating system
Windows operating system
Open-source operating system
None of these
Answer: (c) Open-source operating system
Explanation: The Linux operating system is an open-source operating system made up of a kernel. It is a very safe operating system.
14) What is the full name of the DSM?
Direct system module
Direct system memory
Demoralized system memory
Distributed shared memory
Answer: (d) Distributed shared memory
Explanation: The DSM stands for Distributed Shared Memory.
15) What is the full name of the IDL?
Interface definition language
Interface direct language
Interface data library
None of these
Answer: (a) Interface definition language
Explanation: The IDL stands for Interface Definition Language. It is used to establish communications between clients and servers in RPC (Remote Procedure Call).
16) What is bootstrapping called?
Cold boot
Cold hot boot
Cold hot strap
Hot boot
Answer: (a) Cold boot
Explanation: Bootstrapping is also known as the cool boot.
17) What is the fence register used for?
To disk protection
To CPU protection
To memory protection
None of these
Answer: (c) To memory protection
Explanation: The fence register is used for memory protection on the computer. It is a way to access the memory in the computer.
18) If the page size increases, the internal fragmentation is also?.?
Decreases
Increases
Remains constant
None of these
Answer: (b) Increases
Explanation: None
19) Which of the following is a single-user operating system?
Windows
MAC
Ms-Dos
None of these
Answer: (c) Ms-Dos
Explanation: The single-user operating system is the operating system in which only one user can access the computer system at a time, and Ms-DOS is the best example of a single-user operating system.
20) The size of virtual memory is based on which of the following?
CPU
RAM
Address bus
Data bus
Answer: (c) Address bus
Explanation: The size of virtual memory is based on the address bus.
21) If a page number is not found in the translation lookaside buffer, then it is known as a?
Translation Lookaside Buffer miss
Buffer miss
Translation Lookaside Buffer hit
All of the mentioned
Answer: (a) Translation Lookaside Buffer miss
Explanation: A Translation Lookaside Buffer miss arises when the page table entry needed to translate a virtual address to a physical address is not available in the translation lookaside buffer.
22) Which of the following is not application software?
Windows 7
WordPad
Photoshop
MS-excel
Answer: (a) Windows 7
Explanation: Windows 7 is not an application software because it is a operating system.
23) Which of the following supports Windows 64 bit?
Window XP
Window 2000
Window 1998
None of these
Answer: (a) Window XP
Explanation: Windows XP supports the 64-bits. Windows XP is designed to expand the memory address space. Its original name is Microsoft Windows XP Professional x64 and it is based on the x86-64 architecture.
24) Which of the following windows does not have a start button?
Windows 7
Windows 8
Windows XP
None of these
Answer: (b) Windows 8
Explanation: Windows 8 does not have a start button because it uses the tablet mode, but windows 8.1 has a start button.
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25) Which of the following operating systems does not support more than one program at a time?
Linux
Windows
MAC
DOS
Answer: (d) DOS
Explanation: DOS stands for Disk operating system. Disk operating system is a single-user operating system that does not support more than one program at a time.
26) Which of the following is a condition that causes deadlock?
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Mutual exclusion
Hold and wait
Circular wait
No preemption
All of these
Answer: (e) All of these
Explanation: None
27) Who provides the interface to access the services of the operating system?
API
System call
Library
Assembly instruction
Answer: (b) System call
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Explanation: The system call provides an interface for user programs to access the services of the operating system through the API (Application Program Interface).
28) Where are placed the list of processes that are prepared to be executed and waiting?
Job queue
Ready queue
Execution queue
Process queue
Answer: (b) Ready queue
Explanation: The ready queue is a set of all the processes that processes are ready to execute and wait.
29) Who among the following can block the running process?
Fork
Read
Down
All of these
Answer: (d) All of these
Explanation: None
30) Which of the following does not interrupt the running process?
Timer interrupt
Device
Power failure
Scheduler process
Answer: (b) Scheduler process
Explanation: Scheduler process does not interrupt in any running process. Its job is to select the processes for long-term, short-term, and short-term scheduler.
31) What is Microsoft window?
Operating system
Graphics program
Word Processing
Database program
Answer: (a) Operating system
Explanation: Microsoft Windows is an operating system that was developed by Microsoft company. The Microsoft Windows is available in 32-bits and 64-bits in the market.
32) Which of the following is group of programs?
Accessories
Paint
Word
All of above
Answer: (a) Accessories
Explanation: The windows accessories are a group of programs in the operating system. Windows XP offers many accessories or software that you can use to help with your work. The accessories are not full features programs, but it is useful for a specific task in the operating systems. It provides many programs such as a painting program, a calculator, a word processor, a notepad, and Internet software.
33) Which of the following is an example of a Real Time Operating System?
MAC
MS-DOS
Windows 10
Process Control
Answer: (d) Process Control
Explanation: Process control is a best example of a Real time operating system.
34) Which of the following operating systems do you use for a client-server network?
MAC
Linux
Windows XP
Windows 2000
Answer: (d) Windows 2000
Explanation: Windows 2002 operating systems were used to implement a client Server Network. It is a server OS that was developed by Microsoft in April 24, 2002. It includes some features of Windows XP.
35) Which windows was introduced to My Computer?
Windows 10
Windows XP
Windows 95
Windows 98
Answer: (c) Windows 95
Explanation: Windows 95 was first window to introduced the My Computer.
36) What type of commands are required to perform various tasks in DOS?
Internal commands
External commands
Valuable commands
Primary commands
Answer: (b) External commands
Explanation: External commands are required to perform various tasks in DOS.
37) What is the number of characters contained in the primary name of the file of MS-DOS?
Up to 8 characters
3 characters
Up to 10 characters
None of the above
Answer: (a) Up to 8 characters
Explanation: MS-DOS operating system uses the file system that supports the 8.3 characters. The eight characters are used to the filename, and three characters are used to the extension.
38) Which command is used to fetch a group (.doc) of files that have just been deleted?
Undelete
Undelete/all
Undelete *.doc
All of above
Answer: (c) Undelete *.doc
Explanation: Undelete *.doc command is used to fetch a group (.doc) of files that have just been deleted.
39) Which of the following is system software?
Operating system
Compiler
Utilities
All of the above
Answer: (d) All of the above
Explanation: The system software is a type of computer program designed to run hardware and software programs on a computer.
According to some definitions, system software also includes system utilities, system restore, development tools, compilers, and debuggers.
40) Which program runs first after booting the computer and loading the GUI?
Desktop Manager
File Manager
Windows Explorer
Authentication
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Answer: (d) Authentication
Explanation: The authentication program is run first after booting the computer and loading the GUI. Authentication is a process of verifying the person or device. For example, when you log in to Facebook, you enter a username and password.
These key combinations apply only to Mac computers with an Intel processor, not Mac computers with Apple silicon.
To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. Keep holding until the described behavior occurs.
Command (⌘)-R: Start up from the built-in macOS Recovery system. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. If your Mac is using a firmware password, you're prompted to enter the password.
Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. If your Mac is using a firmware password, you're prompted to enter the password.
Option-Command-P-R:Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery.
Shift (⇧): Start up in safe mode. Disabled when using a firmware password.
D: Start up to the Apple Diagnostics utility. Or use Option-Dto start up to this utility over the Internet. Disabled when using a firmware password.
N: Start up from a NetBoot server, if your Mac supports network startup volumes. To use the default boot image on the server, hold down Option-N instead. Disabled when using a firmware password.
Command-S: Start up in single-user mode. Disabled in macOS Mojave or later, or when using a firmware password.
T: Start up in target disk mode. Disabled when using a firmware password.
Command-V: Start up in verbose mode. Disabled when using a firmware password.
Eject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc. Disabled when using a firmware password.
If a key combination doesn't work
If a key combination doesn't work at startup, one of these solutions might help:
Press and hold all keys in the combination together, not one at a time.
Shut down your Mac. Then press the power button to turn on your Mac. Then press and hold the keys as your Mac starts up.
Wait a few seconds before pressing the keys, to give your Mac more time to recognize the keyboard as it starts up. Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognized and ready for use.
If you're using a wireless keyboard, plug it into your Mac, if possible. Or use your built-in keyboard or a wired keyboard. If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac.
If you're using Boot Camp to start up from Microsoft Windows, set Startup Disk preferences to start up from macOS instead. Then shut down or restart and try again.
Remember that some key combinations are disabled when your Mac is using a firmware password.
Learn more
Keyboard shortcuts that you can use after your Mac has started up.