JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 97 · 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) <js> (b) <style> (c) <script> (d) <code>
2. 2.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) alert() (d) let
3. 3.⚡ What number does this code print?
   let marks = 20;
   marks = marks + 19;
   marks = marks - 9;
   console.log(marks);
4. 4.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) alert() (d) for
5. 5.⚡ What number does this code print?
   let a = 19;
   let b = 18;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let a = 25;
   let b = 22;
   console.log(a - b);
7. 7.⚡ What number does this code print?
   let a = 2;
   let b = 10;
   console.log(a * b);
8. 8.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Meera (d) Hello, Meera!
9. 9.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
10. 10.⚡ What number does this code print?
    let a = 3;
    let b = 6;
    console.log(a * b);
11. 11.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
12. 12.⚡ What number does this code print?
    let a = 20;
    let b = 11;
    console.log(a - b);
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
14. 14.⚡ What number does this code print?
    let score = 16;
    score = score + 4;
    score = score - 10;
    console.log(score);
15. 15.⚡ What number does this code print?
    let a = 10;
    let b = 1;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) console.log() (d) for
18. 18.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
19. 19.⚡ What number does this code print?
    let a = 32;
    let b = 8;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let books = 6;
    books = books + 19;
    books = books - 24;
    console.log(books);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
22. 22.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) if
23. 23.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 10;
    runs = runs - 13;
    console.log(runs);
24. 24.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 4;
    apples = apples - 8;
    console.log(apples);
25. 25.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 5;
    apples = apples - 30;
    console.log(apples);
26. 26.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
27. 27.⚡ What number does this code print?
    let a = 2;
    let b = 9;
    console.log(a * b);
28. 28.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
29. 29.⚡ What number does this code print?
    let a = 41;
    let b = 34;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 29;
    let b = 12;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) 46 (c) Error
32. 32.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 7;
    runs = runs - 3;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 20;
    runs = runs - 17;
    console.log(runs);
34. 34.⚡ What number does this code print?
    let a = 7;
    let b = 12;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 6;
    let b = 4;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) Error (c) 9
37. 37.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 13;
    runs = runs - 28;
    console.log(runs);
38. 38.⚡ What number does this code print?
    let a = 49;
    let b = 27;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 9;
    coins = coins - 3;
    console.log(coins);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) Error (b) 92 (c) 11

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