IT Help Desk General Computer Knowledge And Concepts
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Review quiz over unit 2 in IT Help Desk at Metcalfe County High School
Questions and Answers
1.
Which of the following is the correct unit of measure for a computers overall processing speed?
A.
Byte
B.
Binary
C.
Hertz
D.
Gigabyte
Correct Answer C. Hertz
Explanation Hertz is the correct unit of measure for a computer's overall processing speed. Hertz represents the number of cycles per second that a computer's processor can execute. It measures the frequency at which the processor can perform calculations and process data. A higher hertz value indicates a faster processing speed, while a lower value indicates a slower speed. Therefore, Hertz is the appropriate unit for measuring a computer's overall processing speed.
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2.
Convert the binary number 11110000 into its decimal equivalent.
Correct Answer 240
Explanation To convert a binary number to its decimal equivalent, each digit of the binary number is multiplied by the corresponding power of 2 and then summed up. In this case, the binary number 11110000 has 8 digits. Starting from the rightmost digit, each digit is multiplied by 2 raised to the power of its position from right to left (starting from 0). So, the calculation would be: 1x2^7 + 1x2^6 + 1x2^5 + 1x2^4 + 0x2^3 + 0x2^2 + 0x2^1 + 0x2^0 = 128 + 64 + 32 + 16 + 0 + 0 + 0 + 0 = 240.
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3.
Convert the decimal number 10 into binary.
Correct Answer 00001010 1010
Explanation The correct answer is 00001010. This is the binary representation of the decimal number 10. In binary, each digit can be either 0 or 1. The binary number 00001010 represents 10 in decimal form. The other option, 1010, is also a valid binary representation of 10, but it is not the correct answer given in this case.
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4.
Convert the hex value AA into binary.
Correct Answer 10101010
Explanation The hex value AA represents the decimal value 170. To convert this decimal value into binary, we divide it by 2 repeatedly and note down the remainders in reverse order. The remainders in this case are 0, 1, 0, 1, 0, 1, 0, and 1. Therefore, the binary representation of the hex value AA is 10101010.
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5.
Convert 11000111
Correct Answer 199
6.
If a user want to change their screen resolution they should right click on an open area of the desktop, select the properties sub-menu and then click on what tab with the pop up window?
A.
Display
B.
Monitor
C.
Screen Settings
D.
Main Menu
Correct Answer A. Display
Explanation To change the screen resolution, the user should right-click on an open area of the desktop and select the properties sub-menu. This will open a pop-up window, and the user should then click on the "Display" tab. This tab will allow them to adjust the screen resolution according to their preference.
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7.
Which of the follwoing is the largest unit of computer stoagre listed?
A.
1 Tb
B.
1Gb
C.
100 Mb
D.
10000 bytes
Correct Answer A. 1 Tb
Explanation 1 Tb (Terabyte) is the largest unit of computer storage listed among the given options. A Terabyte is equal to 1,000 Gigabytes (Gb), 1,000,000 Megabytes (Mb), and 1,000,000,000,000 bytes. Therefore, it is the highest value in terms of storage capacity.
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8.
Which of the follwoing is the smallest unit of computer stoagre listed?
A.
100 bytes
B.
1 Tb
C.
1 Kb
D.
10 Gb
Correct Answer A. 100 bytes
Explanation The smallest unit of computer storage is a byte. A byte is the basic unit of measurement for digital information and can represent a single character or a small amount of data. In this case, 100 bytes is the smallest option listed, making it the correct answer.
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9.
Base 10 is the same as which of the following numbering systems?
A.
Hexadecimal
B.
Binary
C.
Decimal
D.
Octal
Correct Answer C. Decimal
Explanation Base 10 is the same as the decimal numbering system because it uses 10 digits (0-9) to represent numbers. In base 10, each digit's value is determined by its position in the number. The rightmost digit represents ones, the next digit represents tens, the next represents hundreds, and so on. This is the most commonly used numbering system, and it is used in everyday life for counting and calculations.
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10.
Base 16 is the same as which of the following numbering systems?
A.
Hexadecimal
B.
Binary
C.
Decimal
D.
Octal
Correct Answer A. Hexadecimal
Explanation Base 16 is the same as the hexadecimal numbering system. Hexadecimal is a positional numeral system with a base of 16, meaning it uses 16 distinct symbols to represent numbers (0-9 and A-F). It is commonly used in computer science and digital systems, as it provides a convenient way to represent and manipulate binary data. In hexadecimal, each digit represents four binary digits (bits), making it easier to convert between binary and hexadecimal representations.
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11.
Base 2 is the same as which of the following numbering systems?
A.
Hexadecimal
B.
Binary
C.
Decimal
D.
Octal
Correct Answer B. Binary
Explanation Base 2 is the same as the binary numbering system. In the binary system, numbers are represented using only two digits, 0 and 1. This is because the binary system is a positional numeral system with a base of 2, meaning each digit's value is determined by its position in the number. Therefore, the correct answer is Binary.
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12.
What are the only 2 symbols that can be used within the binary numering system?
A.
A & B
B.
1 & 2
C.
0 & A
D.
0 & 1
Correct Answer D. 0 & 1
Explanation The binary numbering system consists of only two symbols, 0 and 1. These symbols represent the two possible states of a binary digit, where 0 represents the absence of a signal and 1 represents the presence of a signal. Therefore, 0 and 1 are the only two symbols that can be used within the binary numbering system.
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13.
Convert 100.192 into its binary equivalent.
A.
01100100.11000000
B.
10000001.11000000
C.
01100100.10100000
D.
01101000.01111110
Correct Answer A. 01100100.11000000
Explanation The given answer, 01100100.11000000, is the correct binary equivalent of the decimal number 100.192. In binary, the whole number part 100 is represented as 01100100, and the fractional part 0.192 is represented as 0.11000000.
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14.
Which of the following would a computer technician use to change the background to a standard windows XP background on a PC?
A.
Click on the windows icon, select the run command prompt, type background and select the desired background from the drop down list.
B.
Open MS word and using the images menu select the desired background and use the Ctrl + C keys to select the image as the background.
C.
Right click on the desktop and select screen settings option. Within screen settings locate the background tab and select the background that one wishes to utilize and click OK.
D.
Open control panel and select the display icon. Next select the background tab and apply the background that one wishes to utilize and click on either OK or Apply
Correct Answer D. Open control panel and select the display icon. Next select the background tab and apply the background that one wishes to utilize and click on either OK or Apply
Explanation A computer technician would use the option to open control panel and select the display icon. Then, they would select the background tab and apply the desired background. Finally, they would click on either OK or Apply to save the changes. This method allows the technician to change the background to a standard Windows XP background on a PC.
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15.
Which of the following is not a computer applicaiton?
A.
Microsoft Word
B.
Microsoft Paint
C.
Internet Explorer
D.
RAM
Correct Answer D. RAM
Explanation RAM (Random Access Memory) is not a computer application. It is a hardware component of a computer that is responsible for temporarily storing data that the computer is actively using. Unlike the other options listed, RAM is not a software program or application that can be opened and used by a user. Instead, it is a physical component that supports the operation of computer applications and programs.
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