Computer Literacy Test Lab Quiz Results Answer Key

Section Quiz Candidate: Score:100%  Question 1: Passing Score:80%  Correct Which of the following is the correct binary representation of the number 22? 10101 11000 10111 10110 EXPLANATION 10110 in binary is the same as 22 in decimal. 10101 in binary is the same as 21 in decimal. 10111 in binary is the same as 23 in decimal. 11000 in binary is the same as 24 in decimal. REFERENCES  2.3.1 Number Systems  2.3.2 Number System Facts q_itf_numsystems_facts_01.question.fex  Question 2:  Correct Which of the following notational systems is MOSTlikely used to represent a MAC address? Hexadecimal Binary Decimal Octal EXPLANATION The hexadecimal number system uses sixteen digits - the numerals 0 through 9 and the letters A through F. MAC addresses are typically composed of six groups of two hexadecimal digits separated by hyphens or colons. The binary number system works the exact same way as the decimal number system but uses only two digits - 1 and 0. The decimal number system uses ten digits from 0 to 9. The octal number system uses eight digits from 0 to 7. REFERENCES   2.3.1 Number Systems 2.3.2 Number System Facts q_itf_numsystems_facts_02.question.fex  Question 3:  Correct Given the numerical value 1010101.11, which of the following number systems is MOST likely represented? Octal Decimal Hexadecimal Binary EXPLANATION 1010101.11 represents a decimal number with two decimal places that consist of 1s and 0s. The binary number system uses two digits - 1 and 0. In practice, binary numbers do not use decimal points. In fact, the word "decimal" in decimal point refers to the decimal number system. The hexadecimal number system uses sixteen digits - the numerals 0 through 9 and the letters A through F. Octal is a base-8 number system and uses the digits 0 through 7. REFERENCES  2.3.1 Number Systems  2.3.2 Number System Facts q_itf_numsystems_facts_04.question.fex  Question 4:  Correct Which single digit has the highest value in the hexadecimal number system? G 0 F H 9 EXPLANATION The hexadecimal number system uses sixteen digits - the numerals 0 through 9 followed by the letters A through F.  Question 5:  Correct How many bits are in a single byte? four eight twelve sixteen EXPLANATION One byte is made of eight bits. Each byte has 256 possible combinations from 00000000 to 11111111. REFERENCES  2.3.4 Digital Information Facts  Question 6:  Correct Arrange the following from smallest to largest. Smallest Kilobyte Megabyte Gigabyte Terabyte EXPLANATION A kilobyte is the same as 1024 bytes. A megabyte is about a million bytes, or 1024 kilobytes. A gigabyte is about a billion bytes, or 1024 megabytes. A terabyte is about a trillion bytes, or 1024 gigabytes. REFERENCES   2.3.4 Digital Information Facts Question 7:  Correct A consumer wants to add a hard drive to their computer to store video from their camera. Which of the following is the storage capacity of a modern hard disk drive (HDD) purchased from a computer store? 8 megabytes 4 gigabytes 3 terabytes 1,024 kilobytes EXPLANATION Storage of modern hard disk drives are available in multiples of terabytes. The other capacities are too small to work well for video storage. Listed in order of increased capacity: kilobyte > megabyte > gigabyte > terabyte. REFERENCES  2.3.4 Digital Information Facts  Question 8:  Correct Which of the following transfer rates is the FASTEST? 1.24 Gbps 1,282 Kbps 1,480 Mbps 181 Mbps EXPLANATION 1,480 Mbps is equal to 1.48 Gbps, and so it is the fastest transfer rate listed because it is greater than 1.24 Gbps. In summary, 1,480 Mbps > 1.24 Gbps > 181 Mbps > 1,282 Kbps. REFERENCES   2.3.4 Digital Information Facts Question 9:  Correct Which of the following BEST describes what a kilobyte is a measurement of? Storage space Power level CPU speed Data throughput EXPLANATION Data storage usually refers to the number of bytes. Storage space on a disk is measured in kilobytes (KB), megabytes (MB), gigabytes (GB), and terabytes (TB). Throughput, or data transmission from one computer to another, usually refers to the number of individual bits that can be transmitted in one second. Throughput is measured in kilobits per second (Kbps), megabits per second (Mbps), and gigabits per second (Gbps). The base unit of measure for CPU speed is hertz (Hz) and is recorded in kilohertz (kHz), megahertz (MHz), and gigahertz (GHz). These units of measurement refer to the number of CPU cycles per second, or the number of times per second the processor can write data to memory or read data from memory. Power & sleep options are used to regulate how much electricity a computer system consumes. They determine how long your computer can be idle before turning off the screen or putting it into a low-power sleep mode. REFERENCES  2.3.4 Digital Information Facts  Question 10:  Correct Which of the following encoding schemes would MOST likely be used to represent an emoji? ASCII Hexadecimal Binary Unicode EXPLANATION Unicode is an international 16-bit encoding standard and is capable of representing millions of different characters with enough space for every character from every human language. Developers have even started assigning Unicode values to pictures, called emoji. ASCII is short for American Standard Code for Information Interchange. It is the most common format for plain text files, where each character is represented by a unique 7-bit binary code. Extended ASCII uses an 8-bit binary code and allows for some international characters, but not emoji. Hexadecimal is a numbering system that uses sixteen digits, 0 through 9, and A through F. Binary is a numbering system that uses two digits, 0 and 1. Binary and hexadecimal are NOT encoding schemes. REFERENCES     2.3.3 Digital Information 2.3.4 Digital Information Facts 2.3.5 Data Representation 2.3.6 Data Representation Facts