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Solved Exercise
Section A
(Objective Type Questions)
A. Choose the correct option.
1. Which of the following keywords is used to initialise variables in JavaScript?
i. for ii. getElement
iii. var iv. boolean
2. Which of the following JavaScript methods can be used to display data in some form?
i. alert( ) ii. script tag
iii. document.write iv. Both i and iii
3. Which of the following keywords is used to declare a constant in JavaScript?
i. var ii. const
iii. int iv. None of these
4. What will be the output of the following code snippet?
<script type="text/javascript">
x = 6 + "9";
document.write(x);
</script>
i. 69 ii. Error
iii. 15 iv. Both i and iii
5. Identify the kind of type conversion used:
document.write(null + 6)
i. Typecasting ii. Explicit Type Conversion
iii. Hybrid Type Conversion iv. Implicit Type Conversion
6. How is the comparison done when the switch statement matches the expression with the specified case labels?
i. The expression’s value is compared.
ii. The expression’s datatype is compared.
iii. The expression’s value as well as its datatype are compared.
iv. None of these
7. What will be the output of the following code snippet?
var a = 1;
var b = 0;
while (a <= 3)
{
a++;
b += a + 5;
document.write(b+" ");
}
i. 7 15 24 ii. 15 7 24
iii. 1 2 3 iv. 24 15 7
8. This layer describes the appearance of the document. Identify the layer.
i. Content ii. Behaviour
iii. Expression iv. Presentation
JavaScript Part 1 383

