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Chapter-Input/Output and Memory Devices

Important MCQ questions for Class 11 Computer Science Chapter-Input/Output and Memory Devices

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MCQ Questions set-1 for chapter-Input/Output and Memory Devices class 11 Computer Science 

Computer Science - MCQ on Input/Output and Memory Devices

Class XI

Q.1. Letters and numbers come under

a. punctuation keys.

b. numeric keys.

c. alphanumeric keys.

d. symbolic keys.



Explanation: Alphanumeric keys include all the letters from a-z and numbers from 0-9.

Q.2. A hardware peripheral that allows computer users to input audio into their computers is

a. speaker.

b. keyboard.

c. mouse.

d. microphone.



Explanation: A mic converts the sound received into computer’s format that is in digitalized sound.

Q.3. The best printer among the following is

a. laser Printer.

b. dot-matrix Printer.

c. electromagnetic Printer.

d. thermal Printer.



Explanation: Laser printers produce very high quality output and are very fast.

Q.4. The one also known as non-volatile memory is

a. RAM.

b. ROM.

c. cache Memory.

d. secondary Memory.



Explanation: ROM is non-volatile memory because it is not power dependant.

Q.5. Chips responsible for storing permanent data and instructions are

a. RAM chips.

b. SRAM chips.

c. DRAM chips.

d. ROM chips.

Ans. d)

Explanation: ROM is non-volatile in nature hence the contents are not lost even during power failure.

Q.6. Device used as the standard pointing device in a Graphical User Environment is

a. joystick.

b. mouse.

c. keyboard.

d. trackball.



Explanation: A mouse is a pointer device that points on the location of the cursor on the screen.

Q.7. Among the following all are output device, except

a. scanner.

b. printer.

c. flat screen.

d. touch screen.



Explanation: Touch screen simply works when it is touched i.e. it is an input device.

Q.8. The device having a limitation that information can only be added to it but cannot be erased or modified is

a. floppy disk.

b. hard disk.


d. tape drive.



Explanation: CDROM is used to store information and cannot be used to modify it.

Q.9. The number of bits of information that each memory cell in a computer chip can hold is

a. 0 bits.

b. 2 bits.

c. 4 bits.

d. 1 bit.



Explanation: A memory cell stores one bit of information at a time. A collection of these bits makes a word.

Q.10. The storage device that can store maximum amount of data is

a. floppy disks.

b. hard disk.

c. compact disk.

d. magnetic optical disk.



Explanation: A hard disk, can store anywhere from 10 to more than 100 gigabytes.

Q.11. Primary memory stores

a. data.

b. programs.

c. results.

d. programs to obtain results after processing on data.



Explanation: A primary memory is the main memory in which we can store data, programs as well as results.

Q.12. Storage capacity of hard disk in a common PC is measured in

a. GB.

b. MB.

c. KB.

d. TB.




Explanation: The capacity of a hard disk is measured in Gigabytes.

Q.13. The physical components of a computer system are called

a. software.

b. hardware.

c. application.

d. operating systems.



Explanation: The physical components of a computer system are called hardware, which includes CPU, monitors, mouse etc.

Q.14. RAM is described as memory that is

a. temporarily stored data or programs.

b. retained even after the computer is shut off.

c. controlled by the storage unit.

d. permanently stored instructions.



Explanation: RAM is volatile in nature therefore on power failure the unsaved data gets erased.

Q.16. ROM stands for

a. Random Access Memory.

b. Read Only Memory.

c. Read Output Memory.

d. Routine Output Memory.



Explanation: ROM is read only memory because data can be only read from it and not modified.

Q.17. The appropriate software required for running the input/output devices are called as

a. disks.

b. application software.

c. disk drives.

d. hard disks.



Explanation: A disk drive is a peripheral device used to record and retrieve information. Main implementations are hard disks, floppy disks and optical discs.

Q.18. The number of keys in a keyboard is

a. 100 to 110

b. 101 to 105.

c. 106 to 120.

d. 109 to 115.



Explanation: A keyboard has 101 to 105 keys. There are different types of keys on the keyboard, which include the number keys, character keys and the various symbolic keys.

Q.19. The data accepted by the output unit from processing unit is in

a. decimal form.

b. binary form.

c. octal form.

d. hexadecimal form.



Explanation: The processing unit of computer changes the data to binary form, which is then sent to the output device.

Q.20. The screen of a cathode ray tube is coated with

a. phosphor.

b. phosphorous.

c. zinc oxide.

d. zinc sulphide




Explanation: The screen is coated with phosphor to make it glow.

Q.21. A vector of bits that identifies a particular memory element is called

a. word.

b. memory address.

c. memory.

d. byte.



Explanation: The memory address of an element, which contains bit information, is an array of bits with information organised in the form of memory cells.

Q.22. DRAM stores its information in a cell containing a

a. capacitor and resistor.

b. transistor and resistor.

c. transistor and capacitor.

d. resistor, transistor and capacitor.



Explanation: DRAM consists of two components to store information–Transistor and a capacitor.

Q.23. Optical Code Reader is a

a. input device.

b. output device.

c. storage device.

d. memory device.



Explanation: An optical card reader is used for reading marks made on the face of a preprinted card that utilizes a video camera and a memory device to capture and store an image of at least a portion of the card.

Q.24. The memory access time is measured in

a. milliseconds.

b. microseconds.

c. seconds.

d. nanoseconds.



Explanation: The memory access time is so small in magnitude that it has to be measured in the smallest unit of time that is nanoseconds.

Q.25. The RAM that needs to be refreshed is

a. DRAM.

b. SRAM.





Explanation: As capacitors lose their charge over time, dynamic RAM boards must include logic to “refresh” (recharge) the RAM chips as many as thousand times a second, which is called memory refreshing.

MCQ Questions set-2 for chapter-Input/Output and Memory Devices class 11 Computer Science 

Q.26. DDRSDRAM stands for

a. Decoded Data Rate SDRAM.

b. Digital Data Rate SDRAM.

c. Double Data Rate SDRAM.

d. Digital Data Requirement SDRAM.



Explanation: DDRSDRAM stands for Double Data Rate SDRAM. It provides data transfer at double speed as compared to other types of dynamic RAM.

Q.27. The DRAM allowing data transfer on both transfer edges is


b. Rambus DRAM.

c. Synchronous DRAM.




Explanation: It supports data transfers on both edges of each clock cycle (the rising and falling edges).

Q.28. The memory typically used in calculators is

a. ROM.

b. RAM.

c. DRAM.




Explanation: ROM is used because it is non-volatile.

Q.29. The type of ROM that should not be exposed to ultraviolet light is

a. programmable ROM.

b. erasable PROM.

c. electrical PROM.




Explanation: EPROM is a special type of memory that retains its contents until it is
exposed to ultraviolet light.

Q.30. Characteristic of volatile memory is that

a. it loses its contents at high ambient temperature.

b. its contents are lost on failure of power.

c. it is to be kept in airtight boxes.

d. it is the latest type of bubble memory.



Explanation: Volatile memory is power dependent.

Q.31. Calculations are made by the computer with the help of its

a. main memory.

b. cache memory.

c. ALU.

d. control unit.



Explanation: All the arithmetic and logical calculations are made in the Arithmetic and Logical Unit.

Q.32. The device similar in functioning to a DVD except it has 5.2 GB of memory is

a. CD-R.

b. floppy disk.

c. CD-RW.

d. hard disk.



Explanation: A DVD is same as CD-RW. Both are used to write data and store information. The only difference is of the storage capacity.

Q.33. The components that process data are located in the

a. input devices.

b. output devices.

c. system unit.

d. storage component.



Explanation: The system unit contains ALU and CU for processing the data.

Q.34. The processor and the memory are located on the

a. expansion board.

b. motherboard.

c. output device.

d. storage component.



Explanation: All the components of memory are embedded on the motherboard.

Q.35. The device used to connect external devices to the computer

a. hard disk.

b. ports.

c. compact disk.

d. disk drives.



Explanation: A port is an application-specific or process-specific software construct serving as a communications endpoint used by Transport Layer protocols of the Internet Protocol Suite such as Transmission Control Protocol (TCP) and User Datagram Protocol (UDP).

Q.36. The ports used to connect graphics cards are

a. USB.

b. Infrared Ports.

c. Bluetooth.

d. AGP.



Explanation: It is used to connect graphics card that provides high-speed video performance.

Q.37. A focused ray of light is modulated with information and sent from a transmitter to a receiver in

a. USB.

b. AGP.

c. Infrared Ports.

d. Bluetooth.



Explanation: IR Ports are a special type of ports in which a focused ray of light is modulated with information.

Q.38. The ports used to connect a keyboard or mouse with a computer is

a. bluetooth.

b. PS/2 ports.

c. serial ports.

d. parallel ports.



Explanation: A keyboard and a mouse connection is colour coded so that it becomes easy for the user.

Q.39. The port providing agreement among the two computers at a protocol level is

a. Bluetooth.

b. USB.

c. AGP.

d. PS/2.



Explanation: Bluetooth provides agreement at the protocol level, where products have to agree on when bits are sent, how many will be sent at a time, and how the parties in a conversation can be sure that the message received is the same as the message sent.

Q.40. Data can be erased or modified in

a. CD-R.

b. CD-ROM.

c. CD-RW.

d. floppy disk.



Explanation: CD-RW is erasable disk. It can also be called as rewritable media.

Q.41. A Floppy disk has a storage capacity of

a. 1.44 MB.

b. 700 MB.

c. 40 GB.

d. 10 MB.



Explanation: A floppy disk is a data storage medium that is composed of a disk of thin, flexible ("floppy") magnetic storage medium encased in a square or rectangular plastic shell. It can store up to 1.44 MB of data.

Q.42. EDO DRAM stands for

a. External Data Output DRAM.

b. External Data Out DRAM.

c. Extended Data Out DRAM.

d. Extended Data Output DRAM.



Explanation: It is a short form for Extended Data Out Dynamic Random Access Memory.

Q.43. ta is used to represent

a. memory refreshing time.

b. memory access time.

c. memory output time.

d. memory scheduling time.



Explanation: The amount of time that it takes for the memory to produce the data required, from the start of the access until when the valid data is available for use, is called the memory's access time, sometimes abbreviated ta.

Q.44. The currently executing program and its related data are stored in the

a. secondary memory.

b. cache memory.

c. DRAM.

d. main memory.



Explanation: It’s a storage device used by a computer to hold the currently executing program and its working data.

Q.45. The printers used to print an optical image are

a. Electromagnetic printers.

b. Laser Printers.

c. Inkjet Printers.

d. Electrostatic Printers.



Explanation: Electrostatic Printers are instruments, which is used to print an optical image on a specially treated paper. Electro-statically charged and uncharged portions of the paper illustrate light and dark portions of the original image.

Q.46. A bit stands for

a. binary digit.

b. binary data.

c. byte data.

d. Bit data.



Explanation: A bit is a binary digit, taking a value of either 0 or 1. Binary digits are a basic unit of information storage and communication in digital computing.

Q.47. The number of bits in a word is called

a. bytes.

b. word strength.

c. word length.

d. memory space.



Explanation: Word Length is the number of bits in a word. It stores the information in the word. The amount of information is the word length.

Q.48. DRAM needs to be refreshed due to the presence of

a. transistors.


c. capacitors.

d. resistors.



Explanation: A DRAM needs to be refreshed because the capacitors lose their charge over time.

Q.49. A Data storage device is

a. any device that is designed to store data such as a printer.

b. an input device.

c. an out put device.

d. any device that is designed to store data such as a hard drive.



Explanation: A data storage device is used to store data and its related information.

Q.50. The computer hardware input device that allows a person to scan an image and download it to the computer is

a. printer.

b. scanner.

c. joy stick.

d. light pen.



Explanation: A scanner scans an image and we can save it on a computer.