Computer Knowledge

Computer Hardware Devices

1,004 Questions

Computer Hardware Devices focuses on the physical components of a computer system, including input, output, and memory devices. It tests practical understanding of ports, displays, and peripheral technologies. This topic is common in the computer knowledge section of banking and SSC exams.

Input output devicesMonitor settingsComputer portsAssistive technologyHardware components

Computer Hardware Devices Questions

Multiple choice technology

Keyboard

  1. I-Tech laser keyboard

  2. IR laser keyboard

  3. Apple laser keyboards

  4. Rollup Keyboards
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The 5 PEN PC uses an I-Tech virtual laser keyboard that projects a full QWERTY keyboard onto any flat surface. Unlike IR (infrared) keyboards which are a generic technology description, Apple-specific keyboards, or rollup keyboards, I-Tech was a specific virtual keyboard technology demonstrated with the P-ISM concept.

Multiple choice technology

Security in Pen PC

  1. Sensors based Lock

  2. Cyber-Electronic Lock

  3. E – Finger Printing

  4. Laser Lock
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The 5 PEN PC uses fingerprint-based authentication (denoted as 'E' in the original specifications) for security. This biometric approach is more practical and secure than sensor-based locks, cyber-electronic locks, or laser locks, providing user-specific access control to the device and its data.

Multiple choice technology

New term

  1. a virtual interface technology

  2. name of the device that projects the keyboard in the 5 PEN PC

  3. company that manufactures 5 PEN PC

  4. another name for 5 PEN PC.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The term refers to virtual interface technology, which is the broader concept enabling devices like the virtual laser keyboard in the 5 PEN PC. It's not a device name, manufacturer name, or alternate name for the P-ISM itself, but rather describes the technology category that allows projection of interfaces onto surfaces.

Multiple choice technology

Communication Device

  1. 360 degrees visual communication device

  2. HD Visual Communications device

  3. DLP Communications device

  4. Hand-held visual Communications device
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the 5 PEN PC technology architecture, the communication component is specified as a 360-degree visual communication device. This provides comprehensive visual interaction capability. The other options (HD Visual, DLP, Hand-held) do not match the standard specification for this pen-based computing concept.

Multiple choice technology

Keyboard

  1. I-Tech laser keyboard

  2. IR laser keyboard

  3. Apple laser keyboards

  4. Rollup Keyboards
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The 5 PEN PC uses a laser-projected virtual keyboard, with I-Tech being the specific implementation referenced in this architecture. The keyboard is not physical but projected onto a surface. IR laser and Apple laser keyboards are not the standard specification, while rollup keyboards are physical devices.

Multiple choice technology

Security in Pen PC

  1. Sensors based Lock

  2. Cyber-Electronic Lock

  3. E – Finger Printing

  4. Laser Lock
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The 5 PEN PC incorporates fingerprint-based security through an electronic biometric lock system (E-Fingerprinting). This provides user authentication and device protection suitable for a portable pen device. Sensor-based locks, cyber-electronic locks, and laser locks are not the standard security mechanism for this architecture.

Multiple choice technology

New term

  1. a virtual interface technology

  2. name of the device that projects the keyboard in the 5 PEN PC

  3. company that manufactures 5 PEN PC

  4. another name for 5 PEN PC.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The term '5 PEN PC' refers to a virtual interface technology concept where five pen-like devices combine to form a functional computer system. It is not a company name, specific device name, or keyboard projection technology name, but rather describes a technological approach to pen-based computing.

Multiple choice technology web technology

Touch devices typically have a higher resolution than devices with a keyboard because no space needs to be reserved for the keypad.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Resolution refers to pixel density (PPI) or total pixels, not screen area. Touch devices can use more device footprint for the screen without a physical keyboard, but this does not inherently mean higher resolution. Many keyboard-equipped devices have high-resolution displays. Screen real estate and display resolution are distinct concepts.

Multiple choice technology web technology

Which of the following is false about Emulators? a. Can receive or dial phone calls from real world cellular network b. Useful to distribute and sell device application c. Environment for debugging and testing code d. Provides a look and feel of physical device within PC environment Select the most appropriate sequence below -

  1. a & b above

  2. a, b & d above

  3. c & d above

  4. b, c & d above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mobile device emulators run on PCs and provide a simulated environment for testing mobile applications. Statement (a) is FALSE because emulators cannot make or receive real cellular network calls - they simulate the device environment, not the network connection. Statement (b) is also FALSE because emulators are development/testing tools, not distribution platforms for selling applications. Since the question asks which statement is 'false' and groups a & b together, option A (a & b above) is correct because both statements are indeed false.

Multiple choice

Can we create our own keyboard, if the device is not rooted?

  1. Yes

  2. No

  3. Don’t know

  4. Not applicable
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Android allows creating custom keyboards (Input Method Editors) without root access. You implement the InputMethodService and declare it in your manifest. The user must explicitly enable your keyboard in system settings, which is a security feature but doesn't require root.

Multiple choice

Consider two cache organizations: The first one is 32 KB 2-way set associative with 32- byte block size. The second one is of the same size but direct mapped. The size of an address is 32 bits in both cases. A 2-to-1 multiplexer has a latency of 0.6 ns while a k - bit comparator has a latency of k /10 ns. The hit latency of the set associative organization is h1 while that of the direct mapped one is h2.

The value of h1 is:

  1. 2.4 ns

  2. 2.3 ns

  3. 1.8 ns

  4. 1.7 ns
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Multiple choice

Consider two cache organizations: The first one is 32 KB 2-way set associative with 32- byte block size. The second one is of the same size but direct mapped. The size of an address is 32 bits in both cases. A 2-to-1 multiplexer has a latency of 0.6 ns while a k - bit comparator has a latency of k /10 ns. The hit latency of the set associative organization is h1 while that of the direct mapped one is h2.

The value of h2 is:

  1. 2.4 ns

  2. 2.3 ns

  3. 1.8 ns

  4. 1.7 ns
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Multiple choice

A CPU has a 32 KB direct mapped cache with 128-byte block size. Suppose A is a two dimensional array of size 512×512 with elements that occupy 8-bytes each. Consider the following two C code segments, P1 and P2. P1: for (i=0; i<512; i++) { for (j=0; j<512; j++) { x +=A[i] [j]; } } P2: for (i=0; i<512; i++) { for (j=0; j<512; j++) { x +=A[j] [i]; } } P1 and P2 are executed independently with the same initial state, namely, the array A is not in the cache and i, j, x are in registers. Let the number of cache misses experienced by P1 be M1 and that for P2 be M2 .

The value of the ratio $\dfrac{M_1}{M_2}$

  1. 0
  2. $\dfrac{1}{16}$
  3. $\dfrac{1}{8}$

  4. 16
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Multiple choice

Which port is required to connect display with motherboard?

  1. PS/2

  2. Display port

  3. LPT1

  4. LAN port
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DisplayPort is the digital display interface used to connect a monitor or display to the motherboard's graphics output. PS/2 is for older keyboards/mice, LPT1 is a parallel printer port, and LAN port is for network connections - none of these carry video signals to displays.