Test: Introduction to Computer- 1 - SSC CGL MCQ

Answer: C. Addition and subtraction operations
Explanation: The abacus is an ancient mechanical calculating device primarily used for addition and subtraction. It uses a series of beads on rods to represent numbers, and by moving these beads, users can perform basic arithmetic operations quickly and efficiently. While it can also perform other calculations, its main purpose is to aid in addition and subtraction.

Answer: B. Pascaline
Explanation: Blaise Pascal invented the Pascaline, the first mechanical adding machine, in 1642. This device used a series of gears and dials to perform addition and subtraction, making it a significant advancement in the field of computing.

Answer: A. First Generation
Explanation: First-generation computers, which were developed between 1940 and 1956, used vacuum tubes for circuitry and magnetic drums for memory. These computers were large, consumed a lot of power, and generated significant heat. Examples include ENIAC and EDVAC.

Answer: C. Transistors
Explanation: Second-generation computers, which emerged between 1956 and 1963, utilized transistors instead of vacuum tubes. Transistors were smaller, more reliable, and more energy-efficient than vacuum tubes, leading to smaller and more powerful computers.

Answer: D. Notebook
Explanation: Notebooks, also known as laptops or ultrabooks, are designed to be portable and lightweight. They include a rechargeable battery, allowing them to be used without being plugged into an electrical outlet, making them highly convenient for users who need to work on the go.

Answer: B. Hybrid Computer
Explanation: Hybrid computers combine the features of both analog and digital computers. They can process both continuous data (analog) and discrete data (digital), making them suitable for specialized applications such as medical equipment (e.g., ECG machines) and industrial control systems.

Answer: C. Versatility
Explanation: Versatility refers to a computer's ability to perform a wide range of tasks simultaneously or in quick succession. This makes computers highly adaptable to various applications, from running complex simulations to managing office productivity tasks.

Answer: C. Industry
Explanation: In the industrial sector, computers are essential for controlling manufacturing systems and monitoring various parameters such as temperature, pressure, and volume. They help in automation, improving efficiency, and ensuring the consistent quality of products.

Answer: D. Supercomputer
Explanation: Supercomputers are the fastest and most expensive computers available. They have immense processing power and are used for highly complex tasks that require extensive calculations, such as weather forecasting, scientific simulations, and cryptography.

Answer: A. Hardware and Software
Explanation: A computer system consists of hardware (the physical components, such as the monitor, keyboard, and motherboard) and software (the programs and applications that run on the computer, like word processors and games). These components work together to perform various tasks.