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Computer - an introduction - class-IX

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The ENIAC computer was made during the age of :

  1. First generation computers

  2. Second generation computers

  3. Third generation computers

  4. None of the above


Correct Option: A
Explanation:
 ENIAC (Electronic Numerical Integrator And Computer), built during the period of first generation: 1946-1959

_____________ consists of all the electronic and mechanical parts used in computers.

  1. Hardware

  2. Software

  3. Program

  4. None of these


Correct Option: A
Explanation:
The hardware components of a computer system are the electronic and mechanical parts.

Which of the following is not the correct type of a Monitor?

  1. Laser Monitor

  2. CRT Monitor

  3. LCD Monitor

  4. LED Monitor


Correct Option: A
Explanation:
There is no such monitor like laser monitor.

A processor is fixed on the: 

  1. Chipboard

  2. Fan

  3. Motherboard

  4. Expansion slot


Correct Option: C
Explanation:
The motherboard is a printed circuit board that is the foundation of a computer and processor is fixed on it.

Which of the following is the correct full form for C.P.U.?

  1. Central Programming Unit

  2. Central Processing Unit

  3. Central Programming Union

  4. Central Processing Union


Correct Option: B
Explanation:
The full form of CPU is Central Processing Unit.

Which of the following device is used to check the presence or absence of pen or pencil mark on a paper?

  1. MICR

  2. OCR

  3. OMR

  4. Scanner


Correct Option: C
Explanation:
Optical Mark Reading (OMR) is a method of entering data into a computer system. Optical Mark Readers reads pencil or pen marks made in pre-defined positions on paper forms as responses to questions or tick list prompts

Which of the following is an output device?

  1. OMR

  2. MICR

  3. Printer

  4. Keyboard


Correct Option: C
Explanation:
Printer is an output device as it prints i.e output data from computer.

Which of the following can not be categorised as an input device in a computer?

  1. Mouse

  2. Keyboard

  3. Printer

  4. OMR


Correct Option: C
Explanation:
As the printer is an output device as it prints data from the computer.

Which of the following is not an alpha-numeric key?

  1. 5

  2. <

  3. @

  4. #


Correct Option: A
Explanation:
As 5 is numeric key and not alpha-numeric key.

State whether true or false :
DOS refers to Disc Operating System ?

  1. True

  2. False


Correct Option: A
Explanation:

The above statement is true.

DOS is the acronym for Disk Operating System.

Which printer prints images by spraying the ink on the paper?

  1. Laser printer

  2. Ink-jet printer

  3. Dot matrix printer

  4. Line printer


Correct Option: B
Explanation:
Inkjet printers spray liquid ink onto paper in tiny, precise drops.

In the modern-day computers, when operational, the electrical impulses travel.

  1. At half the speed of light

  2. At seven times the speed of sound

  3. At the speed of sound

  4. Nearly at the speed of light


Correct Option: D
Explanation:

Electromagnetic waves propagate in vacuum at a maximum speed of  29,97,92,458 m/s.

Which of the following is a property of a computer?

  1. Storage capacity

  2. Accuracy

  3. Speed

  4. All of the above


Correct Option: D
Explanation:
The property of a computer are speed, accuracy, diligence, versatility and storage capacity.

Which of the following is a correct categorization of a computer?

  1. Memory, A.L.U., Control device

  2. Keyboard, Mouse, Monitor

  3. Input device, Control device, output unit

  4. None of the above


Correct Option: D
Explanation:
Computers are categorized as:
  1. Personal computers
  2. Mobile computers
  3. Mainframes
  4. Servers
  5. Supercomputers.
Hardware devices can be classified into four distinct categories:
  1. Input devices: For raw data input.
  2. Processing devices: To process raw data instructions into information.
  3. Output devices: To disseminate data and information.
  4. Storage devices: For data and information retention.

Which option correctly explains 'Automation', a property of a computer?

  1. Computer can do complicated calculations in a very short time

  2. Computer has extraordinary capacity to store data

  3. Computer is an automatic machine which when once started, works accordingly to directions as per the given programme

  4. None of the above


Correct Option: C
Explanation:
As a computer is an automatic machine which when once started, works accordingly to directions as per the given programmer.

The physical part of a computer is known as:

  1. Software

  2. Hardware

  3. Operating system

  4. System unit


Correct Option: B
Explanation:
Computer hardware is the physical parts or components of a computer, such as the central processing unit, monitor, keyboard, computer data storage, graphic card, sound card and motherboard.

Computer is an electronic device which can do restless work for a long time without any exhaustion.
This property of computer is termed as:

  1. Wide utility

  2. Accuracy

  3. Diligence

  4. Speed


Correct Option: C
Explanation:
Diligence: - A computer is free from tiredness, lack of concentration, fatigue, etc. It can work for hours without creating any error. If millions of calculations are to be performed, a computer will perform every calculation with the same accuracy. Due to this capability it overpowers human being in routine type of work. 

Which of the following is not a part of Central processing unit?

  1. Memory

  2. A.l.U.

  3. Mouse

  4. Control device


Correct Option: C
Explanation:
The two typical components of a CPU include Arithmetic Logic Unit (ALU), control device and memory.

Which monitor is preferred for good picture quality and low electrical consumption? 

  1. CRT Monitor

  2. LCD Monitor

  3. LED Monitor

  4. None of the above


Correct Option: C
Explanation:
LED monitor is preferred for good picture quality and low electrical consumption.

A byte is a group of

  1. $16$ bits

  2. $8$ bits

  3. $32$ bits

  4. $4$ bits


Correct Option: B

A machine language depends on the ....................... of a computer.

  1. Hardware

  2. Software

  3. Both (a) and (b)

  4. None of these


Correct Option: A
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