Data Handling || Type A || Sumita Arora || Class 11 || Computer science || Information practices || Solution

Data Handling || Type A || Sumita Arora || Class 11 || Computer science || Information practices || Solution

1 = What are data types? How are they important?

 
 

2 = How many integer types are supported by Python? Name them. 

 

3 = How are these numbers different from one another? 33, 33.0, 33j, 33 +j

4 = The complex numbers have two parts: real and imaginary. In which data type are real and imaginary parts represented?

5 = How many string types does Python support? How are they different from one another? 

6 = What will following code print? str1 = ‘’’Hello’’'        str2 = ‘’’Hell \             o’’’         print (len(str1)>len(str2))

7 = What are immutable and mutable types? List immutable and mutable types of python.

8 = What are three internal key-attributes of a value-variable in Python Explain with example.

 

9 = Is it true that if two objects return True for is operator, they will also return True for == operator?


10 = Are these values equal? Why/why not? (i) 20 and 20.0(ii) 20 and int(20)(iii) str(20) and str(20.0) (iv) 'a' and "a”

11 = What is an atom ? What is an expression?

12 = What is the difference between implicit type conversion and explicit type conversion ?


13 = Two objects (say a and b) when compared using ==, return True. But Python gives False when compared using is operator. Why (i.e, a == b is True but why is a is b False ?)

14 = Given str1= "Hello", what will be the values of (a)str1[0]  (b)str1 [1](c)str1[-5](d)str1[-4](e)str1[5]

15 = If you give the following for str1 = "Hello", why does python report error ? str1[2] = 'p'

16 = What will the result given by the following ?(a)type(6+3)  (b)type(6-3)(c)type(6*3)(d)type(6/3)(e)type(6//3)(f)type(6%3)

17 = What are augmented assignment operators ? How are they useful ?

18 = Differentiate between (555/222) ** 2 and (555.0/222) **2.

19 = given three Boolean variables a,b, c as : a= False , b =  True , c = False. Evaluate the following Boolean expressions :(a)b and c (b)b or c (c)not a and b (d)(a and b)or not c (e)not b  and not (a or c)(f)not ((not b or not a)and c )or a


20. What would following code fragments result in ? Given x =3.
(a) 1 <x
(b) x >= 4
(c) x==3
(d) x==3.0
(e) "Hello"== "Hello"
(f) "Hello" > "hello"
(g)4/2==2.0
(h)4/2==2
(i)x <7 and 4>5

 21 = Write following expressions in Python :(a)1/3 b^2 h (b)πr2 h(c)  1/3 πr2 h(d)d = √((x2-x1)^2 )+(y2-y1)^2(e) 〖(x-h)〗^2+〖(y+k)〗^2=r^2(f)x=(-b±√(b^2-4ac))/2a(g)a^n*a^m=a^(n+m)(h)〖(a^n)〗^m=a^nm(i) a^n/a^m =a^(n-m)(j) a^(-n)=1/a^n




22 =  Int(‘a’) produces error. Why?

23. int('a') produces error but following expression having int('a) in it, does not return error. Why? len(‘a’) 2 or int('a')

24 = Write expression to convert the values 17, len('ab') toI = integer (ii) str (ii) Boolean values

25. Evaluate and Justify (i) 22/17=37/47+88/83 (ii) len(375)**2.

26 = Evaluate : (i) 22.0/7.0 - 22/7 (ii)22.0/7.0-int(22.0/7.0)(iii)22/7-int(22.0)/7           and justify

27 =  Evaluate and justify :(i)    false and None(ii)    0 and None (iii)    True and None (iv)     None and None.


28. Evaluate and justify :(a) 0 or None and "or"(b) 1 or None and 'a' or 'b (c) False and 23 (d) 23 and False(e) not (1 == 1 and 0 != 1) (f)("abc" =="Abc" and not (2 == 3 or 3 == 4) (g) False and 1 == 1 or not True or 1 ==1 and False or 0==0

29. Evaluate the following for each expression that is successfully evaluated, determine its value and type for unsuccessful expression, state the reason. (a) len("hello") ==25/5 or 20/10 (b) 3<5 or 50/(5 - (3 + 2)) (c) 50/(5 - (3 + 2)) or 3 < 5(d) 2 *(2 *(len ("01")))

30. Write an expression that uses exactly 3 arithmetic operators with integer literals and produces result as 99.

31 =  Add parentheses to the following expression to make the order of evaluation more clear.
y % 4 ==0 and y % 100 != 0 or y % 400 == 0 

Q32. A program runs to completion but gives an incorrect results. What type of error would have caused it?



Q33. In Python, strings are immutable while lists are mutable. What is the difference?



Q34. How does the // operator differ from the / operator? Give an example of where // would be needed.



Q35. Mid Air Airlines will only allow carry-on bags that are no more than 22 inches long, 14 inches wide, and 9 inches deep. Assuming that variables named length, width, and depth have already been assigned values, write an expression combining the three that evaluates to True if bag fits within those limits, and False otherwise.



Q36. What are main error types? Which types are most dangerous and why?



Q37. Correct any false statements:

(a) Compile-time errors are usually easier to detect and to correct than run-time errors.
(b) Logically errors can usually be detected by the compiler.



Q38. Differentiate between a syntax error and a semantics error.



Q39. Differentiate between a syntax error and a logical error in a program. When is each type of error likely to be found?



Q40. What is the difference between an error and exception?