JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 12 · 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.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
2. 2.⚡ What number does this code print?
   let score = 13;
   score = score + 13;
   score = score - 9;
   console.log(score);
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
4. 4.⚡ What number does this code print?
   let a = 38;
   let b = 27;
   console.log(a - b);
5. 5.⚡ What number does this code print?
   let a = 11;
   let b = 4;
   console.log(a * b);
6. 6.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
7. 7.⚡ What number does this code print?
   let score = 18;
   score = score + 7;
   score = score - 2;
   console.log(score);
8. 8.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
9. 9.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
10. 10.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 17;
    apples = apples - 16;
    console.log(apples);
11. 11.⚡ What number does this code print?
    let a = 46;
    let b = 20;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let books = 17;
    books = books + 8;
    books = books - 11;
    console.log(books);
13. 13.⚡ What number does this code print?
    let a = 55;
    let b = 8;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let books = 6;
    books = books + 5;
    books = books - 6;
    console.log(books);
15. 15.⚡ What number does this code print?
    let score = 18;
    score = score + 19;
    score = score - 35;
    console.log(score);
16. 16.⚡ What number does this code print?
    let a = 12;
    let b = 3;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let a = 9;
    let b = 9;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 7;
    marks = marks - 14;
    console.log(marks);
19. 19.⚡ What number does this code print?
    let a = 60;
    let b = 40;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 16;
    let b = 2;
    console.log(a + b);
21. 21.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) if (d) console.log()
22. 22.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 8;
    coins = coins - 12;
    console.log(coins);
24. 24.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, name! (d) Well done, Riya!
26. 26.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 3;
    runs = runs - 12;
    console.log(runs);
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) name (d) Hi, Riya!
28. 28.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) if (d) console.log()
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 77 (b) Error (c) 14
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 17 (b) Error (c) 98
31. 31.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, Zoya! (d) Hello, name!
33. 33.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) console.log() (d) if
34. 34.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 3;
    apples = apples - 14;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 13;
    runs = runs - 16;
    console.log(runs);
36. 36.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Well done, name! (c) name (d) Kabir
37. 37.⚡ What number does this code print?
    let a = 15;
    let b = 9;
    console.log(a + b);
38. 38.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) console.log() (d) let
39. 39.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Aman (d) Well done, name!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2

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