Computer Science Class 11: Unit-1 MCQs Part-1

        Here's your first MCQ from Chapter 1 of the NCERT Computer Science textbook for 11th grade CBSE:

1. What is the definition of a computer?

A) An electronic device for playing games

B) A machine that can execute instructions and perform tasks

C) A device used only for browsing the internet

D) A electronic calculator

Correct answer: B) A machine that can execute instructions and perform tasks

Explanation: A computer is indeed a machine that can execute instructions and perform tasks, making it a versatile tool for various applications.

2. Which of the following is an example of a hardware component?

A) Operating System
B) Web Browser
C) Keyboard
D) Java

Correct answer: C) Keyboard

Explanation: A keyboard is an input device and a physical component of a computer system, making it a hardware component.

3. What is the term for a set of instructions that a computer can execute?

A) Algorithm

B) Program

C) Software

D) Data

Correct answer: B) Program

Explanation: A program is indeed a set of instructions that a computer can execute. It is a collection of code written in a programming language, designed to perform specific tasks.

Correct answer: B) Program

Explanation: A program is indeed a set of instructions that a computer can execute. It is a collection of code written in a programming language, designed to perform specific tasks.

4. Which of the following is an example of a software application?

A) Mouse

B) Calculator

C) Microsoft Word

D) Scanner

Correct answer: C) Microsoft Word

Explanation: Microsoft Word is a software application used for word processing, creating documents, and editing text. It is a type of application software that runs on a computer.

5. What is the term for the process of solving problems in a step-by-step manner?

A) Algorithm

B) Programming

C) Debugging

D) Compilation

Correct answer: A) Algorithm

Explanation: An algorithm is a well-defined procedure that takes some input and produces a corresponding output by following a set of steps. It is a systematic approach to solving problems in a step-by-step manner.

6. What is the definition of Computer Science?

a) Study of computer hardware

b) Study of computer software

c) Study of computer systems and their applications

d) Study of computer networks

Answer: c) Study of computer systems and their applications. 

Explanation: Computer Science is the study of computer systems, including hardware, software, and their applications.

7. Which of the following is NOT a component of a computer system?

a) Hardware

b) Software

c) Data

d) User

Answer: d) User

Explanation: A user is not a component of a computer system, but rather an individual who uses the system.

8. What is the primary function of a computer?

a) To perform calculations

b) To store data

c) To process information

d) To control machines

Answer: c) To process information

Explanation: The primary function of a computer is to process information, which includes performing calculations, storing data, and controlling machines.

9. Which generation of computers used transistors?

a) First generation

b) Second generation

c) Third generation

d) Fourth generation

Answer: b) Second generation

Explanation: The second generation of computers used transistors, which replaced vacuum tubes.

10. What is the term for a set of programs that a computer can execute?

a) Algorithm

b) Program

c) Software

d) Hardware

Answer: b) Software

Explanation: A program is a set of instructions that a computer can execute, while an algorithm is a procedure for solving a problem.

11. What is the difference between a computer and a calculator?

a) A computer can only perform arithmetic operations

b) A calculator can only perform arithmetic operations

c) A computer can perform any type of calculation and store data

d) A calculator can perform any type of calculation and store data

Answer: c) A computer can perform any type of calculation and store data

Explanation: A computer can perform various types of calculations, store data, and execute programs, whereas a calculator is limited to basic arithmetic operations.

12. Which of the following is an example of a computer hardware component?

a) Operating System

b) Web Browser

c) Keyboard

d) Java

Answer: c) Keyboard

Explanation: A keyboard is a hardware component, while an operating system, web browser, and Java are software components.

13. What is the term for the process of solving problems using a computer?

a) Computer Science

b) Programming

c) Algorithm

d) Computation

Answer: a) Computer Science

Explanation: Computer Science is the study of solving problems using computers, which includes programming, algorithms, and computation.

14. Which generation of computers used vacuum tubes?

a) First generation

b) Second generation

c) Third generation

d) Fourth generation

Answer: a) First generation

Explanation: The first generation of computers used vacuum tubes, which were later replaced by transistors in the second generation.

15. What is the term for a set of rules that govern the behavior of a computer program?

a) Syntax

b) Semantics

c) Logic

d) Grammar

Answer: a) Syntax

Explanation: Syntax refers to the rules that govern the structure of a programming language, while semantics refers to the meaning of the code.

16. What is the term for the "brain" of the computer?

a) CPU

b) Memory

c) Input/Output devices

d) Storage device

Answer: a) CPU

Explanation: The CPU (Central Processing Unit) is the brain of the computer, responsible for executing instructions and performing calculations.

17. Which of the following is an example of a software application?

a) Web Browser

b) Keyboard

c) Mouse

d) Monitor

Answer: a) Web Browser

Explanation: A web browser is a software application that allows users to access and view websites, while the keyboard, mouse, and monitor are hardware components.

18. What is the term for the process of converting high-level language code into machine code?

a) Compilation

b) Interpretation

c) Execution

d) Debugging

Answer: a) Compilation

Explanation: Compilation is the process of converting high-level language code into machine code, which can be executed directly by the computer.

19. Which of the following is a characteristic of a computer?

a) High speed

b) High storage capacity

c) High accuracy

d) All of the above

Answer: d) All of the above

Explanation: Computers are characterized by their high speed, high storage capacity, and high accuracy, making them powerful tools for processing information.

20. What is the term for the process of inputting data into a computer?

a) Input

b) Output

c) Processing

d) Storage

Answer: a) Input

Explanation: Input refers to the process of entering data into a computer, which can be done through various devices such as keyboards, scanners, and sensors.

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