12th Class English Medium Computer Science Full Book Online Short Questions Preparation

Question # 1

Differentiate between Primary key and Secondary key.

Ans 1: Primary Key:In a relation,the attributes the column or a combination of attributes that uniquely identifies a row or a record.
Ans 2: Secondary Key: A secondary key is non unique field that is used as a secondary key.

Question # 2

Who is Programmer?

Ans 1: A computer is a device that follow the instructions given to it. A person who well define set of instructions to the computer is called Programmer .

Question # 3

Trace the errors.
#include<stdio.h>
Void main()
{
printf ("High Level Language")
}

Ans 1: Errors:
- Errors is terminator sign has not been used in printf statement.
Main()
{
printf("555\n");
printf ("55");
}

Question # 4

How a source code is different than an object code.

Ans 1: Source Code :
- Source code is in the form of the text .
- Source code is Human Readable.
- Source code is generated by human .
- Source code is Input Given to Compiler.
Ans 2: Object Code :
- Object code is in the form of binary Numbers.
- Object code is in Machine Readable.
- Object code is generated by Compiler.
- Object code is Output of Compiler.

Question # 5

Find error from the following .
Int y;z;
If(y = = z)
Printf ("yes)"

Ans 1: Error :
- 1st error is method to declare variable is wrong
- 2nd error is terminator has not been used in printf statement

Question # 6

Rewrite the following code using do-while loop.
Int x= 10;
While (x> =1)
{ printf ("'%d", x%2);
x--;
}

Ans 1: Rewrite in do-while loop:
Void main ( )
{
Int x = 10;
Do
{
Printf("%d\n",x%2);
X=x-1;
}while (n>=1);
}

Question # 7

Trace the error.
#include <stdio.h>
Void main (void)
Printf("Hello World");

Ans 1: Errors: Errors is bracket have not been used in Main body.

Question # 8

What is identifier ?

Ans 1: Identifier are the names used to represent variables, constant, types, function, and labels in the program. Identifiers in C can contain any number of characters, but only the first 31 are significant to C : standard identifiers and user-defined identifiers.Example : int money; double account balance Here; money and account balance are identifiers.

Question # 9

Define Variables.

Ans 1: Variables : Variables are named memory location (Memory cells), which are used to store programs input data and its computational results during program execution. Variables must not be matched with keywords or reserved words.
Example :
- Salary
- X
- Number
- Y

Question # 10

List any two files types from usage point of view.

Ans 1:
1. Master File
2. Transaction File
3. Backup File

Question # 11

Define Alternate keys.

Ans 1: Sometimes it is not clear which field is to select as the primary key.There might exist some additional fields(or combination of fields) that also have the uniqueness property.These keys are termed as alternate key.

Question # 12

What is the concept of Data Distribution Strategy?

Ans 1: Data Distribution Strategy:Many organizations today have distributed computing networks . For these organizations, a significant problem in physical database design is deciding at which nodes (or sites) in the network to physically locate the data.

Basic data distribution strategies:
a) Centralized b) Partitioned
c) Replicated d) Hybrids

Question # 13

What is homonym?

Ans 1: A homonym is created when same name is used for two attributes. Consider the following example :Customer SupplierCompany_Name Company_NameWe Should use Supplier _Name instead of Company _Name in Supplier

Question # 14

Write Definition of Reports.

Ans 1: The Report object of database is used to retrieve and present data in a formatted way . The report can be printed. Some reports are simply a list of the records in the database, one record after the other. Most of the popular DBMS provide this facility. The output of the query can also be given as input source to reports.

Question # 15

Who is end users?

Ans 1: The user or end-user is simply is a person who uses the computer for his specific need.He might have a moderate knowledge of computer,computer sciences and information technology and his need to use computers may be entertainment,education or professional task.

Question # 16

What is difference between Relation and Relationship.

Ans 1: Relation:A two dimensional array or table of data containing descriptive information about an entity.The entity must have a unique identifier,which is composed of a combination of one or more attributes and each attributes must have one and only one value.
Ans 2: Relationship:The relationship indicated how the entities/Objects are connected or related to each other,
- All the relationship defines the relevant connections between both objects.
- All the relationship are bi-directional.

Question # 17

What is the output of the following statement , if grade='B'?If (grade = ='A' || grade == 'B' && grade =='C')Printf ("Fail");ElsePrintf ("Pass");

Ans 1: Output : Pass

Question # 18

Write the output of the following code.
Int x =3;
Printf("%d",x);
Printf("%d",x++);
Printf("%d",++x);

Ans 1: Output:
x = 3
x = 3
x = 4

Question # 19

Show output :if(1 = =2)Printf ("Programming")Else if (2 = =1)Printf ("Language");ElsePrintf("Correct ir");

Ans 1: Output: Correct it

Question # 20

Difference between degree of relation and cardinality of relation.

Ans 1: Degree of Relation: The number of field in a relation is called the degree of a table. Once the table is created, its degree usually does not change,e.g. A table with five fields has a degree of 5.
Ans 2: Cardinality of Relation: The Number of record in a relation is called the cardinality of the relation. The cardinality of a relation as new records are added or existing records are deleted, e.g a table with 50 record has a cardinality of 50

Test Name	Total Questions	PDF File	Launch Test
ICS Part 2 Computer Science Chapter 1 Short Questions Preparation	22	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 2 Short Questions Preparation	18	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 3 Short Questions Preparation	16	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 4 Short Questions Preparation	13	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 5 Short Questions Preparation	25	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 6 Short Questions Preparation	20	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 7 Short Questions Preparation	23	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 8 Short Questions Preparation	43	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 9 Short Questions Preparation	48	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 10 Short Questions Preparation	95	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 11 Short Questions Preparation	64	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 12 Short Questions Preparation	29	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 13 Short Questions Preparation	16	Download PDF	Launch Test
ICS Part 2 Computer Science Chapter 14 Short Questions Preparation	12	Download PDF	Launch Test

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