Data Processing Past Questions | JAMB, WAEC, NECO and Post UTME Past Questions

The question is asking who invented the punch card machine. The punch card machine is an early device used for data processing.

Option A: Blaise Pascal is not the correct answer. Blaise Pascal was a French mathematician and philosopher, but he did not invent the punch card machine.

Option B: Gottfried Leibniz is also not the correct answer. Gottfried Leibniz was a German mathematician and philosopher, but he did not invent the punch card machine.

Option C: J. Prosper Eckert is not the correct answer. J. Prosper Eckert was an American electrical engineer, but he did not invent the punch card machine.

Option D: Dr. Herman Hollerith is the correct answer. Dr. Herman Hollerith was an American inventor who invented the punch card machine. His invention revolutionized data processing and was an important step in the development of modern computers.

So, the correct answer is Option D: Dr. Herman Hollerith. He is the person who invented the punch card machine.

For more information, please see the recommended textbooks.

To convert a number from base 8 (octal) to base 2 (binary), we can use a method called the "Repeated Division by 2" method.

In this method, we repeatedly divide the given number by 2 and keep track of the remainders. We continue dividing until we reach a quotient of zero. Then, we write down the remainders in reverse order to get the binary equivalent.

Let's apply this method to the given number, 47\(_8\): Step 1: Divide 47 by 2: - Quotient: 23 - Remainder: 1 Step 2: Divide 23 by 2: - Quotient: 11 - Remainder: 1 Step 3: Divide 11 by 2: - Quotient: 5 - Remainder: 1 Step 4: Divide 5 by 2: - Quotient: 2 - Remainder: 1 Step 5: Divide 2 by 2: - Quotient: 1 - Remainder: 0 Step 6: Divide 1 by 2: - Quotient: 0 - Remainder: 1 Now, we write down the remainders in reverse order: 111011\(_2\). Therefore, the binary equivalent of 47\(_8\) is 111011\(_2\). Looking at the options given, we can see that Option A: 100111\(_2\) matches our calculated binary equivalent. So, Option A is the correct answer. Remember, when converting numbers between different bases, it's important to understand the method used and practice it to ensure accuracy.

The question is asking about the operation of checking input data against specified criteria. This operation is referred to as data validation.

Data validation is an important step in the data processing process. It involves checking the accuracy, completeness, and correctness of input data. This is done by comparing the input data with specific criteria or rules that have been defined.

For example, if you were entering the age of a person into a form, the data validation process would check if the age entered is within a certain range, such as between 1 and 120 years. If the age entered is outside this range, an error message would be displayed, indicating that the data is not valid.

Data verification, on the other hand, refers to the process of ensuring that the data entered is accurate and complete. It involves checking for errors or inconsistencies in the data, such as misspelled words or missing information.

Data cross-check and data control are not the correct terms for the operation described in the question.

Therefore, the correct answer to this question is Option B: data validation.

Data collection is defined as the procedure of collecting, measuring and analyzing accurate insights for research using standard validated techniques. All the other processes help to achieve this apart from option D.

This question is asking which of the following options is not an application of computers.

The options are:

A. bank notes counter (Correct)

B. point of sales terminal

C. Automated Teller Machine

D. traffic lights control

To answer this question, we need to understand what an application of computers means. An application of computers refers to how computers are used in different areas or fields to perform specific tasks or functions.

Let's look at each option:

Option A: bank notes counter - This is a machine that counts money. It uses sensors and computer software to accurately count and sort banknotes. This is an application of computers because the computer is used to perform the task of counting the banknotes.

Option B: point of sales terminal - This is a device used in retail stores to process sales transactions. It includes a computer system that records sales, calculates totals, and generates receipts. This is also an application of computers because the computer is used to perform the task of processing sales transactions.

Option C: Automated Teller Machine (ATM) - This is a machine that allows bank customers to perform various banking transactions such as withdrawing money, depositing money, and checking account balances. The ATM uses a computer system to interact with the customer and process the requested transactions. This is also an application of computers because the computer is used to perform the tasks of interacting with the customer and processing the banking transactions.

Option D: traffic lights control - This refers to the computer systems used to control the timing and sequencing of traffic lights at intersections. The computer system analyzes traffic flow and adjusts the timings of the lights to optimize traffic flow and ensure safety. This is also an application of computers because the computer is used to control and regulate traffic lights.

Based on the explanations above, we can conclude that the correct answer is Option A: bank notes counter. This is because a bank notes counter does not involve the use of a computer. Instead, it relies on mechanical and electronic components to count banknotes.

To learn more about applications of computers, please read the relevant sections of the recommended textbooks.

This question is asking which of the following is a secondary storage device.

Secondary storage devices are used to store data for a long period of time, even when the computer is turned off. They are different from primary storage devices like RAM, which only hold data temporarily while the computer is running.

Out of the options given, the correct answer is the floppy disk. Floppy disks were commonly used in the past to store and transfer data. They were small, portable, and had a limited storage capacity. However, they have become less popular with the advancement of technology and the introduction of more efficient and higher capacity storage devices.

RAM, which stands for Random Access Memory, is a type of primary storage device. It is used to temporarily store data that the computer is actively using. When the computer is turned off, the data in RAM is lost.

Bubble memory is a type of non-volatile memory, but it is not commonly used as a secondary storage device. It was popular in the 1970s and 1980s, but has since been replaced by other technologies.

EPROM, which stands for Erasable Programmable Read-Only Memory, is a type of non-volatile memory that can be reprogrammed multiple times. However, it is not typically used as a secondary storage device.

In summary, the correct answer to this question is option C: floppy disk.

This question is asking about information analysis procedures and which option is not included in those procedures. Information analysis procedures are the steps and methods used to analyze and understand information.

Option A: skin and scan. This option is correct because "skin and scan" is not a commonly used term or procedure in information analysis. It is likely a distractor meant to confuse you.

Option B: recognizing interrelationships. This is an important step in information analysis. It involves identifying and understanding how different pieces of information are connected or related to each other.

Option C: interpret and conclude. This is another important step in information analysis. It involves analyzing and interpreting the information gathered, and then drawing conclusions based on that analysis.

Option D: identifying propaganda and bias. This is also an important step in information analysis. It involves being able to recognize when information is biased or influenced by propaganda, and being able to separate fact from opinion.

Based on the options given, the correct answer is Option A: skin and scan. This term is not commonly used in information analysis procedures.

To learn more about information analysis procedures and how to analyze information effectively, please read the relevant sections of your textbook.

The question is asking about the advantages of electronic data processing. Electronic data processing refers to the use of computers and other electronic devices to process, store, and retrieve data.

The options provided are:

A. Automatic processing

B. Hacking (Correct)

C. Fast and reliable processing

D. Storage capacity

We need to identify the option that is not an advantage of electronic data processing.

Option A, automatic processing, is an advantage of electronic data processing. With electronic data processing, tasks can be automated, reducing the need for manual intervention and increasing efficiency.

Option B, hacking, is the correct answer. Hacking is not an advantage of electronic data processing. Hacking refers to unauthorized access to computer systems or networks with the intention of stealing or manipulating data. It is a security threat and can cause harm to the system and data.

Option C, fast and reliable processing, is an advantage of electronic data processing. Computers can process data at high speeds and provide reliable results.

Option D, storage capacity, is an advantage of electronic data processing. Electronic devices have the ability to store large amounts of data, allowing for easy access and retrieval.

In summary, the advantages of electronic data processing include automatic processing, fast and reliable processing, and storage capacity. The option that is not an advantage is hacking, as it is a security threat to the system.

A transmission medium is something that can mediate the propagation of signals for the purposes of telecommunication. A modem is a device or program that enables a computer to transmit data and so cannot be regarded as a transmission medium.

Digital computers are devices that are used to process and store information. They work by using binary digits, which are represented by the numbers 0 and 1. These binary digits are used to represent data, such as numbers, text, images, and sound.

The question is asking which statement is true about digital computers. Let's look at the options:

Option A states that digital computers consist of magnetic core memory. Magnetic core memory was a type of memory used in early computers, but it is not a defining characteristic of digital computers in general. Therefore, option A is not the correct answer.

Option B states that digital computers understand data as a continuous measurement of a physical quantity. This statement is not true. Digital computers process data in discrete steps using binary digits, not as a continuous measurement. Therefore, option B is not the correct answer.

Option C states that digital computers represent numbers through a string of binary digits. This is true. Digital computers use binary digits to represent numbers and perform calculations. This is a fundamental characteristic of digital computers, so option C is the correct answer.

Option D states that digital computers are mainly used for scientific purposes. While digital computers are indeed used in scientific research and calculations, they are also used in many other fields such as business, education, entertainment, and communication. Therefore, option D is not the correct answer.

In summary, the correct answer to the question is option C: digital computers represent numbers through a string of binary digits. This is a fundamental characteristic of digital computers.