CLASS - VII
CHAPTER - 7 ( Understanding Arrays and Collections )
Worksheets
Objective Type Questions
Question 1 What is the
starting index of an array?
Option 1 -1
Option 2- 1
Option 3- 2
Option 4- 0
Answer: Option 4
Question 2 Which one is
an incorrect array?
Option 1 Arr[] = [‘a’ ,
‘b’ ,’c’ ,’d’]
Option 2 Arr[] = [1 , 2
,3 ,4]
Option 3 Arr[] = [1,
‘a’, ‘b’, 2]
Option 4 Arr[] = [2.0 ,
9.4, 5.6 , 6.7]
Answer: Option 3
Question 3 An array is
Option 1 A group of
elements of same data type
Option 2 A type of
collection that contains more than one element
Option 3 A type of
collection in which elements are stored in memory in continuous or contiguous
locations
Option 4 All of the
above
Answer: Option 4
Question 4 Select a
correct statement about Arrays
Option 1 An array
address is the address of first element of array itself
Option 2 An array size
must be declared if not initialized immediately
Option 3 Array size is
the sum of sizes of all elements of the array
Option 4 All of the
above
Answer: Option 4
Standard Questions
1. What are collections?
Answer: A collection is
nothing but a container that groups multiple items into a single object.
Collections are used to store data. We can also retrieve and manipulate data
that is stored in the Collections.
2. How can we iterate
over collections?
Answer: The iterators
are used to provide users a uniform way of accessing collections in a
sequential manner. Whatever type of collection we are using, we always need to
traverse through the elements of these collections to fetch the data or make
any modifications to that data
3. What are the different types of modifications that we can perform on
collections?
Answer: Modification
operations (such as add, remove and clear)