ICT Revision MCQ Series 4. Logic Gates with Boolean Functions

Modern ICT systems are automated and do not rely on manual operation.

AND outputs 1 only if all inputs are 1, OR outputs 0 only if all inputs are 0, NOT inverts the input, and NAND outputs 0 only if all inputs are 1.

Computers are classified as mainframe, mini, digital, analog, or hybrid, but "hybridization" is not a valid classification.

XOR is not considered a basic logic operator in Boolean logic. The basic operators are AND, OR, and NOT.

Entertainment devices are not a core component of a computer system.

The NOR gate outputs 1 only if all inputs are 0. It outputs 0 if any input is 1.

AND has a curved input and sharp output, OR has a D-shaped symbol, NOT has a triangle with a circle, and NAND has a D-shaped symbol with a circle.

Efficiency reduces resource usage, accuracy ensures error-free results, speed enables faster processing, and scalability allows growth.

Explanation:
To find the input combination that results in Q = 1:

1. For the output Q to be 1, the inputs to the NOR gate must both be 0.
2. This means the outputs of both AND gates must be 0.
3. The first AND gate will output 0 if either A or B is 0.
4. The second AND gate will output 0 if either B or C is 0.
5. The only combination where both AND gates output 0 is when A = 0, B = 0, and C = 0.

Thus, the correct answer is (a) A = 0, B = 0, C = 0.

ICT enables remote learning, email communication, database management, and online government services.

Entertainment is not a core function of a computer system.

The AND gate outputs 1 only when all inputs are 1, making it ideal for detecting simultaneous conditions.

E-government uses ICT to provide citizens with easier access to government services.

All the given statements about logic gates are correct.

Integrated circuits were introduced in the third generation, not the fourth.

Data refers to raw, unprocessed facts, while processed information is the output.

ICT generally reduces unemployment by creating new job opportunities and improving efficiency.

Boolean logic simplifies problems using binary values and forms the basis of digital circuits but does not require manual calculations.

Explanation:
To determine the output Q, follow these steps:

1. The first AND gate has inputs A and B. Since both are 1, the output of this AND gate is 1.
2. The second AND gate has inputs B and C. Since both are 1, the output of this AND gate is 1.
3. The two outputs from the AND gates (1 and 1) are fed into a NOR gate.
4. A NOR gate outputs 1 only if both inputs are 0. In this case, since both inputs to the NOR gate are 1, the output Q will be 0.

Thus, the correct answer is (a) 0.

A good information system should be simple and user-friendly, not overly complex.

An information system processes raw data into meaningful information using input, processing, and output components.

The logical sequence is to first define the problem, then create a block diagram, followed by the logic diagram, and finally test the solution.