Important Questions 2019-20 Computer Science – Class -XII All Questions are compulsory:- Revision Tour 1. Differentiate between an identifier and keywords. 2. Do you see any similarity between a typedef name and a reference name? If yes, what is it? 3. Give a difference between the type casting and automatic type conversion. Also give a suitable C++ code to illustrate both. 4. Why main () function is important in C++? Give reason. 5. How is an entry controlled loop different from exit controlled loop? 6. WAP to generate and display all the prime numbers up to N numbers. 7. What is the use of random () and randomize () functions? Explain with the help of a C++ program. 8. What is the difference between actual Parameter and Formal Parameter? Give a suitable C++ example to illustrate them. 9. What is the benefit of using function prototype for a function? Give a suitable example to illustrate it using C++ code. 10. WAP to illustrate the concept of passing an array of structures to a function. Database And SQL 1. Give suitable example of table with sample data and illustrate the following:- a. Primary Key b. Candidate Key c. Foreign Key d. Alternate Key e. Tuple f. Cardinality g. Relation h. Record 2. What do you understand by selection and projection operation in relational algebra? 3. Explain the following commands and clause with proper example:- a) Create g) Update b) Insert h) having c) Delete i) Group by d) Drop j) join e) View k) Union f) Alter l) Distinct m) Select n) Rename o) All p) Where q) AND r) OR s) Between t) Not between u) In Operator v) Like Operator
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Important Questions 2019-20
Computer Science – Class -XII
All Questions are compulsory:- Revision Tour
1. Differentiate between an identifier and keywords.
2. Do you see any similarity between a typedef name and a reference name? If yes, what is it?
3. Give a difference between the type casting and automatic type conversion. Also give a suitable
C++ code to illustrate both.
4. Why main () function is important in C++? Give reason.
5. How is an entry controlled loop different from exit controlled loop?
6. WAP to generate and display all the prime numbers up to N numbers.
7. What is the use of random () and randomize () functions? Explain with the help of a C++
program.
8. What is the difference between actual Parameter and Formal Parameter? Give a suitable C++
example to illustrate them.
9. What is the benefit of using function prototype for a function? Give a suitable example to
illustrate it using C++ code.
10. WAP to illustrate the concept of passing an array of structures to a function.
Database And SQL
1. Give suitable example of table with sample data and illustrate the following:-
a. Primary Key b. Candidate Key c. Foreign Key d. Alternate Key
e. Tuple f. Cardinality g. Relation h. Record
2. What do you understand by selection and projection operation in relational algebra?
3. Explain the following commands and clause with proper example:-
a) Create
g) Update
b) Insert
h) having
c) Delete
i) Group by
d) Drop
j) join
e) View
k) Union
f) Alter
l) Distinct
m) Select n) Rename o) All p) Where q) AND r) OR
s) Between t) Not between u) In Operator v) Like Operator
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Networking
1 Define network with its sub type.
2. Explain the evolution of network including ARPANET.
3. Difference between Internet, Intranet & Interspace.
4. What do you mean by switching Techniques? Explain circuit switching/Message switching and
Packet switching?
5. Explain Data communication Technologies in details.
6. What do you mean by Topologies? Explain all types of Topologies with example.
7. Explain Network devices.
1- Modem 2- RJ-45 3- Ethernet card
4- Hub 5- Switch 6- Repeater
7- Bridge 8- Router 9- Gateway
10- Wifi-card
8. What kind of protocols used in networking? Explain with example.
9. Define Network security with its type.
Important Questions 2019-20Revision Tour
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