#### Composition and Decomposition - Important Question Paper

11th Standard

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Computer Science

Time : 01:00:00 Hrs
Total Marks : 50

Part A

Multiple Choice Question

10 x 1 = 10
1. Which of the following is the most widely used notation to represent algorithms?

(a)

Flowchart

(b)

Pseudo code

(c)

English language

(d)

all of these

2. Which notation shows the algorithm in a visual manner?

(a)

Flowchart

(b)

Pseudo code

(c)

Programming language

(d)

Natural language

3. In the flowchart, the control flow of the algorithm represented by

(a)

rectangular

(b)

diamond shaped boxes

(c)

arrows

(d)

parallelogram boxes

4. How many outgoing arrows are labeled in flowchart diamond shaped box?

(a)

2

(b)

4

(c)

1

(d)

0

5. Suppose u, v = 10, 5 before the assignment. What are the values of u and v after the sequence of assignments?
1 u :=v
2 v := u

(a)

u, v = 5,5

(b)

u, v = 5 ,10

(c)

u, v = 10,5

(d)

u, v = 10 ,10

6. Which of the following properties is true after the assignment (at line 3)?
1 -- i+j = 0
2 i, j := i1+, j1-
3 -- ?

(a)

i + j > 0

(b)

i+j < 0

(c)

i+j=0

(d)

i = j

7. If C1 is false and C2 is true, the compound statement
1 if CI
2 SI
3 else
4 if C2
5 S2
6 else
7 S3
executes

(a)

S1

(b)

S2

(c)

S3

(d)

none

8. If C is false just before the loop, the control flows through
1 SI
2 while C
3 S2
4 S3

(a)

S1 ; S3

(b)

S 1 ; S2 ; S3

(c)

S 1 ; S2 ; S2 ; S3

(d)

S 1 ; S2 ; S2 ; S2 ; S3

9. If C is true, S1 is executed in both the flowcharts, but S2 is executed in

(a)

(1) only

(b)

(2) only

(c)

both (1) and (2)

(d)

neither (1) nor (2)

10. How many times the loop is iterated?
i:= 0
while i $\neq$5
i := i+ 1

(a)

4

(b)

5

(c)

6

(d)

0

11. Part B

Answer all the Two Mark Questions

6 x 2 = 12
12. Both conditional statement and iterative statement have a condition and a statement. How do they differ?

13. What is the difference between an algorithm and a program?

14. What is a Pseudocode?

15. What is a Flow-chart?

16. What are the 3 important control flow statements?

17. What is meant by Decomposition?

18. Part C

Answer all the Three Mark  Questions

6 x 3 = 18
19. Draw a flowchart for -3case analysis using alternative statements.

20. Define a function to double a number in two different ways:
(1) n + n,
(2) 2 x n.

21. What are the notations used for expressing algorithms?

22. Define Decomposition in defining algorithm.

23. Write a note on Pseudo code.

24. What are the disadvantage of using flowchart?

25. Part D

Answer all the Five Mark  Questions

2 x 5 = 10
26. Explain case analysis in detail with an example.

27. Write the disadvantages of flowcharts.