Question

1. True or False: The selection sort cannot be used to sort strings.

A. True

B. False

2. The __________ search is most efficient for large amounts of data.

A. binary

B. serial

C. selection

D. bubble

3. What will be displayed after the following code is executed?

var chips = new Array("plain", "onion", "tuna", "barbecue", "cheddar");

document.write("There are " + chips.length + 1 + " types of chips.");

document.write("My favorite is " + chips[2] + ".");

A. There are 4 types of chips.

My favorite is barbecue.

B. There are 5 types of chips.

My favorite is onion.

C. There are 51 types of chips.

My favorite is tuna.

D. There are 6 types of chips.

My favorite is tuna.

4. Which of the following code snippets will load an array named fives(), consisting of 10 elements with the starting value of the first element = 0 and will load each subsequent element counting by 5's, ending with the last element = 45. In other words, the elements in the fives() array should be (0, 5, 10, 15, ... 45).  

A. var fives = new Array();
for(j = 1; j < 11; j++)
     fives[j] = j + 5;

B. var fives = new Array();
for(j = 1; j < 11; j++)
     fives[j] = j * 5;

C. var fives = new Array();
fives[0] = 0;
for(j = 1; j < 10; j++)
     fives[j] = fives[j - 1] + 5;

D. var fives = new Array();
for(j = 0; j < 11; j++)
     fives[j] = fives[j ] + 1

5. Which statement will delete the first two items in the food() array given below?

var food = new Array("burger", "chips", "soup", "pizza", "lasagna");

A. food.splice(1-2);

B. food.splice(2);

C. food.splice(2, 0);

D. food.splice(0, 2);

Answer 1

Answer:

Ques 1:

The correct answer is B) False

Explanation:

This is an incorrect statement, as any sorting algorithm can be used to sort any type of data.

Whether it be integer type, floating type, character type, or string type data.

Just the comparison is to be done lexicographically in strings.

Ques 2:

The correct answer is A)

Explantion:

Binary search is the most efficient searching algorithm

This is because it has the worst case complexity of O(log n)

Bubble and selection are sorting techniques, not searching techniques.

So, other options are wrong.

Ques 3:

The answer is C)

Explanation:

chips.length, will return the number of elements in the chips array.

As there are a total of 5 elements, so it will return 5

After that, 1 is written which is treated as a string and it becomes 51.

Now, chips[2] will return "tuna" as indexing starts from 0 and hence index 2 is the third element of array.

Ques 4:

The answer is C)

Explanation:

A , B and D options are wrong because, they are trying to access the index till index 10.

But as the length of the array is only 10, so index of the last element will be 9.

C option is correct as it initialises the first element to 0 and then it keeps increasing every next element by adding 5 to the previous element.

Ques 5:

The correct answer is D)

Explanation:

splice method takes first argument as the index from where the elements are to be deleted.

Then, the next argument tells that how many elements starting from that index should be deleted.

So, splice(0, 2) will delete the first 2 elements of the array.

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