By Ankit Sir
1. JavaScript kis type ki language hai?
A) Server-side scripting
B) Client-side scripting
C) Markup language
D) Style sheet language
Ans: B
2. JavaScript file ka extension kya hota hai?
A) .js
B) .java
C) .jvs
D) .script
Ans: A
3. JavaScript code ko HTML me likhne ke liye kaun sa tag use hota hai?
A) <script>
B) <javascript>
C) <code>
D) <js>
Ans: A
4. Variable declare karne ke liye kaun sa keyword use ho sakta hai?
A) var
B) let
C) const
D) Sabhi
Ans: D
5. JavaScript me string likhne ke liye kya use hota hai?
A) Single ya double quotes
B) Sirf brackets
C) Sirf braces
D) Sirf angle brackets
Ans: A
6. Concatenation operator kaun sa hai?
A) -
B) +
C) *
D) /
Ans: B
7. Strict equality operator kaun sa hai?
A) ==
B) =
C) ===
D) !=
Ans: C
8. == aur === me main difference kya hai?
A) Dono same hain
B) === type aur value dono compare karta hai
C) == type aur value compare karta hai
D) === assignment operator hai
Ans: B
9. if statement ka sahi syntax kya hai?
A) if (condition) { }
B) if condition { }
C) if {condition} { }
D) if (condition); { }
Ans: A
10. Fixed times repeat hone wala loop kaun sa hai?
A) if loop
B) for loop
C) switch loop
D) case loop
Ans: B
11. Array me first element ka index kya hota hai?
A) 1
B) 0
C) -1
D) 2
Ans: B
12. Array ki length property kya return karti hai?
A) Last index
B) Number of elements
C) Memory size
D) Sirf even elements
Ans: B
13. alert() function kya karta hai?
A) Console me message print karta hai
B) Popup dialog box me message dikhata hai
C) Form submit karta hai
D) Page reload karta hai
Ans: B
14. prompt() function ka use kis liye hota hai?
A) User se input lene ke liye
B) Alert dikhane ke liye
C) Confirm dialog ke liye
D) Console clear karne ke liye
Ans: A
15. confirm() function kya return karta hai?
A) Hamesha true
B) Hamesha false
C) true ya false (OK/Cancel)
D) 0 ya 1 random
Ans: C
16. DOM ka full form kya hai?
A) Document Object Model
B) Data Object Model
C) Document Oriented Model
D) Digital Object Module
Ans: A
17. Element ko id se select karne ke liye kaun sa method use hota hai?
A) document.getElementByTagName()
B) document.getElementByClassName()
C) document.getElementById()
D) document.queryId()
Ans: C
18. Button click par kaun sa event fire hota hai?
A) onchange
B) onload
C) onclick
D) onsubmit
Ans: C
19. JavaScript case-sensitive language hai?
A) Nahi
B) Haan, case-sensitive hai
C) Sirf functions ke liye
D) Sirf variables ke liye
Ans: B
20. NaN ka matlab kya hai?
A) Not a Number
B) No any Number
C) Negative and Null
D) Number and Name
Ans: A
21. typeof "5" ka result kya hoga?
A) number
B) string
C) object
D) undefined
Ans: B
22. Function define karne ka sahi syntax?
A) function myFun() { }
B) fun myFun() { }
C) func: myFun() { }
D) define myFun() { }
Ans: A
23. Uninitialized variable ki default value kya hoti hai?
A) null
B) 0
C) undefined
D) ""
Ans: C
24. Array me element last me add karne ke liye kaun sa method?
A) push()
B) pop()
C) shift()
D) unshift()
Ans: A
25. Array ke last element ko remove karne ke liye?
A) push()
B) pop()
C) shift()
D) splice()
Ans: B
26. JavaScript me single-line comment ka syntax?
A) /* comment */
B) # comment
C) // comment
D) <!-- comment -->
Ans: C
27. isNaN("123") ka result kya hoga?
A) true
B) false
C) null
D) undefined
Ans: B
28. parseInt("10.5") ka result kya hoga?
A) 10.5
B) 11
C) 10
D) 0
Ans: C
29. document.write() ka use kya hai?
A) Console log karna
B) HTML document me directly content likhna
C) CSS apply karna
D) File me save karna
Ans: B
30. JavaScript me function call kaise karte hain?
A) call function;
B) function;
C) function();
D) run function;
Ans: C
Prepared By Ankit Sir | JavaScript MCQ Practice