Javascript MCQ
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This document contains 10 multiple choice questions about JavaScript concepts like functions, methods, and objects. It provides the question, possible answers, and a short explanation of the correct answer for each question. The questions cover topics like JavaScript functions for user input, string object methods, substring and slice methods, placement of script tags, external JavaScript inclusion, setTimeout() method, location object, this keyword, and class member types.
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Javascript MCQ
- 1. IMPORTANT MCQs FOR ONLINE EXAM JAVASCRIPT
- 2. 1) In a Javascript Application what function can be used to send messages to users requesting for an text input? a. Display() b. Alert() c. GetOutput() d. Prompt() ANSWER: Prompt() Explanation: This function is used when we want to input text in javascript. 2) - Which of the following function of String object returns a string representing the specified object? A - toLocaleUpperCase() B - toUpperCase() C - toString() D - substring() Answer : C Explanation toString() − Returns a string representing the specified object.
- 3. 3) - Which built-in method returns the characters in a string beginning at the specified location? A - substr() B - getSubstring() C - slice() D - None of the above. Answer : A Explanation substr() method returns the characters in a string beginning at the specified location through the specified number of characters. 4) - Which of the following function of String object returns the characters in a string between two indexes into the string? A - slice() B - split() C - substr() D - substring() Answer : D Explanation substring() − Returns the characters in a string between two indexes into the string.
- 4. 5)The script tag must be placed in A.head B.head and body C.title and head D.all of the mentioned Answer: Option B Solution:If the script tag is placed after the body tag, then, it will not be evaluated at all. Also, it is always recommended and effective to use the script snippet in the <head> tag. 6)Which of the following attribute is used to include External JS code inside your HTML document A.src B.ext C.script D.link Answer: Option A Solution: A ”src” attribute could be used to add any external code into the HTML document.
- 5. 7)The setTimeout() belongs to which object? A.Element B.Window C.Location D.None of the mentioned Answer: Option B Solution: The setTimeout() method of the Window object schedules a function to run after a specified number of milliseconds elapses. 8. To which object does the location property belong? A.Window B.Position C.Element D.Location Answer: Option A Solution: The location property of the Window object refers to a Location object, which represents the current URL of the document displayed in the window, and which also defines methods for making the window load a new document.
- 6. 9) The keyword or the property that you use to refer to an object through which they were invoked is A.from B.to C.this D.Object Answer: Option C Solution: The ‘this’ keyword is used to refer to the object through which the properties or methods were invoked. This use of ‘this’ is a fundamental characteristic of the methods of any class 10)The four kinds of class members are A.Instance methods, Instance fields, Static method, Dynamic method B.Instance fields, Instance methods, Class fields, Class methods C.Instance fields, Non-instance fields, Dynamic methods, Global methods D.Global methods, Local methods, Dynamic methods, Static methods Answer: Option B Solution: The four kinds of class members are Instance fields, Instance methods, Class fields, Class methods.
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