JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 630 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) name (c) Welcome, name! (d) Arjun
2. 2.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, name! (d) Welcome, Aman!
3. 3.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) if
4. 4.⚡ What number does this code print?
   let a = 52;
   let b = 28;
   console.log(a - b);
5. 5.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
6. 6.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
7. 7.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) alert() (d) console.log()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) 10 (b) Error (c) 64
9. 9.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
10. 10.⚡ What number does this code print?
    let score = 11;
    score = score + 13;
    score = score - 15;
    console.log(score);
11. 11.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Kabir (d) Hello, name!
12. 12.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
13. 13.⚡ What number does this code print?
    let a = 5;
    let b = 13;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let books = 24;
    books = books + 15;
    books = books - 9;
    console.log(books);
15. 15.⚡ What number does this code print?
    let a = 41;
    let b = 35;
    console.log(a + b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 11 (c) 47
17. 17.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Hello, name! (d) Riya
19. 19.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
20. 20.⚡ What number does this code print?
    let a = 26;
    let b = 13;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 10;
    marks = marks - 12;
    console.log(marks);
22. 22.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) console.log()
23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Zoya! (c) name (d) Zoya
24. 24.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) Error (c) 5
26. 26.⚡ What number does this code print?
    let a = 19;
    let b = 20;
    console.log(a + b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) Error (b) 62 (c) 8
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 37 (c) 10
29. 29.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) console.log() (d) if
30. 30.⚡ What number does this code print?
    let a = 34;
    let b = 8;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let a = 31;
    let b = 4;
    console.log(a + b);
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) Riya (d) name
33. 33.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
35. 35.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) 24 (c) Error
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) name (d) Welcome, Riya!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) Error (c) 42
39. 39.⚡ What number does this code print?
    let a = 16;
    let b = 28;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) Welcome, Meera! (d) name

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