Computer — All MCQs
4795 questions available
Q3941.Which of the following holds the data while the CPU is currently working on it?
Correct Answer: B
RAM (Random Access Memory) holds active, volatile data and program instructions being processed by the CPU.
Q3942.In Microsoft World which key is used to select entire text?
Correct Answer: D
Ctrl + A is the keyboard shortcut for 'Select All' text and objects.
Q3943.A(n) ________ is an identification code that consists of a set of vertical lines and spaces of different widths.
Correct Answer: A
A bar code represents alphanumeric values through a set of parallel vertical lines and spaces of varying widths.
Q3944.A(n) ________ protects a computer by identifying and removing any viruses found in memory, on media, or in files.
Correct Answer: B
An antivirus program detects, quarantines, and cleans computer viruses and malware.
Q3945.Open-source software ______?
Correct Answer: D
Open-source software provides source code accessibility, allowing free download, customization, and redistribution.
Q3946.A widely used type of application software related to communications is ________, which allows users with an Internet connection to access web pages.
Correct Answer: C
A web browser is the communication application software designed to retrieve and display web pages.
Q3947.The circuitry of the system unit usually is part of or is connected to a circuit board called the?
Correct Answer: A
The motherboard is the primary printed circuit board that connects all system unit modules (CPU, RAM, slots).
Q3948.What is the output of the following python code? a= [1, 2, 3, 4] b= [num * 2 for num in a if num % 2 == 0] print(b)
Correct Answer: C
The list comprehension filters even numbers (2 and 4) from 'a' and multiplies them by 2, resulting in [4, 8].
Q3949.What is the format of entering date into a database while inserting data into it?
Correct Answer: A
The ISO standard string format 'YYYY-MM-DD' is the default and safest way to write dates into SQL databases.
Q3950.Which simulation technique is used to model system with uncertainty and variability?
Correct Answer: A
Monte Carlo simulation uses repeated random sampling to simulate systems with inherent uncertainty and variable outcomes.
Q3951.Which method is used to prevent overfitting in machine learning models?
Correct Answer: A
Regularization adds a penalty term (L1 or L2) to large weights in the loss function to prevent overfitting and improve generalization.
Q3952.Which architecture uses a single memory space for both data and instructions?
Correct Answer: C
The Von Neumann architecture features a single memory space that stores both program instructions and data.
Q3953.What does "MPEG" stand for in multimedia?
Correct Answer: C
MPEG stands for Moving Picture Experts Group, which develops standard formats for compressing and representing digital audio and video.
Q3954.What is the correct formula to calculate the cost of a cloud computing deployment?
Correct Answer: A
The formula CostCLOUD = Σ(UnitCostCLOUD / (Revenue – CostCLOUD)) modeling the economic trade-offs in cloud resource deployment.
Q3955.In database normalization, which normal form ensures that every non-prime attribute is fully functionally dependent on every candidate key?
Correct Answer: C
Second Normal Form (2NF) eliminates partial functional dependencies, ensuring all non-prime attributes depend on the entire candidate key.
Q3956.Which artificial intelligence concept involves agent operating in an environment to achieve a goal?
Correct Answer: B
In Reinforcement Learning, an autonomous agent interacts with an environment and learns to achieve a goal based on rewards and penalties.
Q3957.What is the correct syntax to access the value at address ptr in C, where ptr is a pointer?
Correct Answer: B
The asterisk (*) symbol is the dereference operator in C, used to access the value stored at the pointer's memory address.
Q3958.What is the purpose of a Fishbone Diagram in quality assurance?
Correct Answer: B
A Fishbone Diagram (Ishikawa or cause-and-effect diagram) is used in QA to identify and systematically organize potential root causes of defects.
Q3959.Which type of memory is non-volatile and can be electrically erased and reprogrammed?
Correct Answer: B
Flash memory is a non-volatile, solid-state storage medium that can be electrically erased and reprogrammed in blocks.
Q3960.Which of the following statements is true about an interface in Java?
Correct Answer: C
Java interfaces can contain abstract methods (without bodies) and default methods (with bodies, introduced in Java 8). They cannot have constructors or instance variables.