JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 679 · 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 JavaScript word makes a new variable? (a) for (b) alert() (c) console.log() (d) let
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
3. 3.⚡ What number does this code print?
   let score = 20;
   score = score + 16;
   score = score - 18;
   console.log(score);
4. 4.⚡ What number does this code print?
   let a = 12;
   let b = 8;
   console.log(a * b);
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
6. 6.⚡ What number does this code print?
   let a = 11;
   let b = 3;
   console.log(a + b);
7. 7.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
8. 8.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
9. 9.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) alert() (d) let
10. 10.⚡ What number does this code print?
    let a = 41;
    let b = 39;
    console.log(a + b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 87 (b) Error (c) 15
12. 12.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) alert()
13. 13.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) let
14. 14.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
15. 15.⚡ What number does this code print?
    let score = 17;
    score = score + 20;
    score = score - 27;
    console.log(score);
16. 16.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
17. 17.⚡ What number does this code print?
    let a = 14;
    let b = 16;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let a = 9;
    let b = 22;
    console.log(a + b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) Error (b) 8 (c) 35
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) Error (c) 10
21. 21.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
22. 22.⚡ What number does this code print?
    let a = 10;
    let b = 7;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let coins = 15;
    coins = coins + 19;
    coins = coins - 17;
    console.log(coins);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) Error (c) 55
25. 25.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) Hi, Aman! (d) name
26. 26.⚡ What number does this code print?
    let a = 30;
    let b = 16;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 19;
    runs = runs - 22;
    console.log(runs);
28. 28.⚡ What number does this code print?
    let a = 50;
    let b = 11;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 12;
    marks = marks - 11;
    console.log(marks);
30. 30.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 5;
    coins = coins - 4;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let a = 60;
    let b = 4;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 11 (c) 83
34. 34.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) Error (b) 18 (c) 99
36. 36.⚡ What number does this code print?
    let a = 12;
    let b = 7;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 8;
    let b = 9;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 52;
    let b = 17;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let score = 8;
    score = score + 5;
    score = score - 8;
    console.log(score);
40. 40.⚡ 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

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