JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 583 · 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 number does this code print?
   let a = 4;
   let b = 8;
   console.log(a * b);
2. 2.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
3. 3.⚡ What number does this code print?
   let a = 38;
   let b = 7;
   console.log(a - b);
4. 4.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) for
5. 5.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) for (d) let
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 1;
   console.log(x + y); (a) 61 (b) Error (c) 7
7. 7.⚡ What number does this code print?
   let coins = 27;
   coins = coins + 6;
   coins = coins - 26;
   console.log(coins);
8. 8.⚡ What number does this code print?
   let a = 40;
   let b = 4;
   console.log(a - b);
9. 9.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
10. 10.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 20;
    apples = apples - 19;
    console.log(apples);
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Riya (d) Hi, name!
12. 12.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 10 (b) 91 (c) Error
14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) Zoya (c) name (d) Well done, name!
15. 15.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 6;
    apples = apples - 13;
    console.log(apples);
16. 16.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
17. 17.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 5;
    apples = apples - 2;
    console.log(apples);
18. 18.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) console.log() (d) alert()
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) Error (c) 13
21. 21.⚡ What number does this code print?
    let a = 2;
    let b = 9;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 27;
    let b = 24;
    console.log(a + b);
23. 23.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) name (c) Well done, name! (d) Well done, Meera!
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Zoya (d) Welcome, Zoya!
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
26. 26.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) Error (b) 48 (c) 12
28. 28.⚡ What number does this code print?
    let score = 24;
    score = score + 7;
    score = score - 3;
    console.log(score);
29. 29.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) if (d) alert()
30. 30.⚡ What number does this code print?
    let books = 5;
    books = books + 19;
    books = books - 13;
    console.log(books);
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) Meera (d) name
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 6 (c) 15
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) 7 (c) Error
34. 34.⚡ What number does this code print?
    let a = 26;
    let b = 16;
    console.log(a - b);
35. 35.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Well done, name! (c) Kabir (d) name
36. 36.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Aman (d) Hi, name!
37. 37.⚡ What number does this code print?
    let a = 16;
    let b = 25;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) Error (c) 96
40. 40.⚡ What number does this code print?
    let a = 47;
    let b = 37;
    console.log(a + b);

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