JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 861 · 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.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
2. 2.⚡ What number does this code print?
   let a = 37;
   let b = 7;
   console.log(a - b);
3. 3.⚡ What number does this code print?
   let apples = 27;
   apples = apples + 15;
   apples = apples - 7;
   console.log(apples);
4. 4.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) console.log() (d) for
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 3;
   console.log(x + y); (a) Error (b) 9 (c) 63
6. 6.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) for (d) if
7. 7.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) for (d) let
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 9;
   console.log(x + y); (a) 79 (b) Error (c) 16
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 5;
   console.log(x + y); (a) 10 (b) 55 (c) Error
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 86 (b) Error (c) 14
11. 11.⚡ What number does this code print?
    let a = 38;
    let b = 33;
    console.log(a - b);
12. 12.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) let
14. 14.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 19;
    apples = apples - 43;
    console.log(apples);
15. 15.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
16. 16.⚡ What number does this code print?
    let a = 36;
    let b = 28;
    console.log(a + b);
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) Welcome, Riya! (d) name
18. 18.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 10;
    runs = runs - 16;
    console.log(runs);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 58 (b) Error (c) 13
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) Error (c) 66
21. 21.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Well done, name! (d) Kabir
22. 22.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
23. 23.⚡ What number does this code print?
    let a = 32;
    let b = 27;
    console.log(a - b);
24. 24.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) let (d) alert()
25. 25.⚡ What number does this code print?
    let a = 60;
    let b = 23;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 55;
    let b = 34;
    console.log(a + b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 92 (b) 11 (c) Error
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
29. 29.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 10;
    coins = coins - 9;
    console.log(coins);
30. 30.⚡ What number does this code print?
    let books = 11;
    books = books + 5;
    books = books - 3;
    console.log(books);
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
32. 32.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Arjun (d) Welcome, Arjun!
33. 33.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 12;
    coins = coins - 22;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 3;
    marks = marks - 12;
    console.log(marks);
35. 35.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 14;
    apples = apples - 7;
    console.log(apples);
36. 36.⚡ What number does this code print?
    let a = 53;
    let b = 20;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 16 (b) 7 (c) Error
38. 38.⚡ What number does this code print?
    let a = 39;
    let b = 17;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) name (d) Riya
40. 40.⚡ What number does this code print?
    let a = 52;
    let b = 5;
    console.log(a - b);

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