JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 935 · 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 = "Meera";
   alert("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
2. 2.⚡ What number does this code print?
   let a = 12;
   let b = 10;
   console.log(a * b);
3. 3.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) for (d) let
4. 4.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Kabir! (c) Kabir (d) name
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Kabir! (c) Kabir (d) name
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 4;
   console.log(x + y); (a) 44 (b) 8 (c) Error
7. 7.⚡ What number does this code print?
   let a = 28;
   let b = 3;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let coins = 17;
   coins = coins + 10;
   coins = coins - 17;
   console.log(coins);
9. 9.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) name (d) Well done, Riya!
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) if (d) console.log()
11. 11.⚡ What number does this code print?
    let books = 7;
    books = books + 11;
    books = books - 2;
    console.log(books);
12. 12.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) if (d) alert()
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
14. 14.⚡ What number does this code print?
    let books = 12;
    books = books + 14;
    books = books - 8;
    console.log(books);
15. 15.⚡ What number does this code print?
    let score = 26;
    score = score + 15;
    score = score - 20;
    console.log(score);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) Error (c) 29
18. 18.⚡ What number does this code print?
    let books = 30;
    books = books + 10;
    books = books - 22;
    console.log(books);
19. 19.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) Hi, Arjun! (d) name
20. 20.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
21. 21.⚡ What number does this code print?
    let a = 41;
    let b = 38;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 43;
    let b = 2;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let score = 5;
    score = score + 4;
    score = score - 8;
    console.log(score);
25. 25.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) for
26. 26.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 10;
    runs = runs - 6;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 10;
    coins = coins - 10;
    console.log(coins);
28. 28.⚡ What number does this code print?
    let a = 47;
    let b = 34;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) Hello, Kabir! (d) name
30. 30.⚡ Which JavaScript word repeats code? (a) for (b) if (c) console.log() (d) alert()
31. 31.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) 14 (c) Error
33. 33.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) name (c) Hello, name! (d) Kabir
34. 34.⚡ What number does this code print?
    let score = 12;
    score = score + 4;
    score = score - 4;
    console.log(score);
35. 35.⚡ What number does this code print?
    let a = 31;
    let b = 20;
    console.log(a + b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 53 (b) 8 (c) Error
37. 37.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
38. 38.⚡ What number does this code print?
    let books = 28;
    books = books + 8;
    books = books - 18;
    console.log(books);
39. 39.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Zoya (d) Welcome, name!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 82 (c) 10

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