Question

1. Given the following array, what is the value of pets[3]?

var pets = new Array("giraffe", "pig", "beetle", "hamster", "spider", "goldfish", "cow");

A. pig

B. beetle

C. hamster

D. spider

2. Given the following array, which statement will create a variable named product that multiplies 4 * 5, using array elements?

var nums = new Array(2, 3, 4, 5, 6, 30, 40, 50, 60);

A. var product = nums[1] * nums[2];

B. var product = nums[2] * nums[3];

C. var product = nums[3] * nums[4];

D. var product = nums[4] * nums[5];

3. Which statement will add the value stored in the variable pizza to the food() array given below?

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

var pizza = "pepperoni pizza";

A. food[0] = pizza;

B. pizza.push(food);

C. food.push(pizza);

D. This cannot be done.

4. Assume the variables x, y, and temp have previously been declared as numeric variables. If initially x = 2 and y = 6, what is the value of temp after the following code is executed?

temp = x;

y = temp;

x = y;

A. 2

B. 6

C. NaN

D. It is impossible to tell from this code.

Answer 1

1.

Ans: (c) hamster

pets[0]="giraffe" ,pets[1]="pig" ,pets[2]="beetle" ,pets[3]="hamster"

so, hamster will be printed.

2.

Ans: (b). var product = nums[2] * nums[3];

because nums[2]=4 and nums[3] =5

so, nums[2] *nums[3] = 4*5 =20

3.

Ans: (c). food.push(pizza)

Because here array is food so, by using push operation we push pizza ro food by using

food.push(pizza) operation.

4.

Ans: (a) 2

because initially x=2 and y=6

here, temp=x now temp becomes 2 i.e., temp=2

y=temp now y beomces 2 i.,e, y=2

x=y now x becomes y i.e., x=2

so, final value of temp is 2