Question

SECTION - B
1.
.name in both tables
A.
Multiple Choice Questions:
A relationship works by matching a field with the
c. Unique
a. Same
b. Different
2.
Which property allows the user to specify user defined name forany column.
a. Field
b. Visible
c. Alias
3. Which button is used to run aquery without saving it?
a. Execute
b. Run Query
c. Run
In how many ways a form can be generated?
a. 2
b.3
c. 4
5.
is a type of query that prompts you for input before it runs.
a. Select
b. Parameter
c. None of these
4
В.
Answer the following:

Answer 1

Answer:

Command Line Interface is preferred over Graphical User Interface even today as it gives the user more power to exploit the features of the computer and also the operating system.

Limitation of CLI

The user needs to learn the syntax of numerous commands in order to use CLI.

Real Time Operating System

Response time is the time taken by a system to react to a given input. In a Real Time Operating System (RTOS), the response time is very critical and is fixed. In case of any event, the system has to respond within a fixed duration of the time or else the system might collapse. So we can say that RTOS is time-driven.

Usually in a RTOS, the output of one unit acts as an input for another unit. So delay in receiving output from a unit delays the supply of input to the next unit. The second unit does not respond to the delayed input and so does not give any output for which the third unit might be waiting. So the whole system crashes.

The best examples of RTOS are airbags in a car, fire alarm system, aircraft control system.

Generally, RTOS are embedded systems meaning that they are a part or a unit of a larger system. For example, temperature control system in ACs and refrigerators, digital watches, MP3 players, in mobile phones etc. Some of the widely used RTOS are LINUX, Windows CE, RT LINUS, OSE, QNX etc.

Differences between Real Time Operating System and General Purpose Operating System

Real Time Operating System General Purpose Operating System

1. It has deterministic time behaviour i.e. the operating system consumes only an expected amount of time. 1. The time consumed by a process is not fixed.

2. It is time-driven system. 2. It is process-driven system.

3. These are generally embedded systems e.g., controllers in washing machines, ACs. 3. These are not embedded systems e.g., personel computers, desktops.