JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 76 · 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 = 58;
   let b = 33;
   console.log(a + b);
2. 2.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
3. 3.⚡ What number does this code print?
   let a = 54;
   let b = 1;
   console.log(a - b);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 5;
   console.log(x + y); (a) Error (b) 65 (c) 11
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 1;
   console.log(x + y); (a) Error (b) 51 (c) 6
6. 6.⚡ What number does this code print?
   let coins = 9;
   coins = coins + 12;
   coins = coins - 14;
   console.log(coins);
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) for
9. 9.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) for (d) let
10. 10.⚡ What number does this code print?
    let score = 26;
    score = score + 6;
    score = score - 29;
    console.log(score);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 43 (c) 7
12. 12.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
13. 13.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a * b);
14. 14.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
15. 15.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, Aman! (d) Hello, name!
16. 16.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 4;
    marks = marks - 21;
    console.log(marks);
18. 18.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) console.log() (d) if
19. 19.⚡ What number does this code print?
    let score = 19;
    score = score + 17;
    score = score - 23;
    console.log(score);
20. 20.⚡ What number does this code print?
    let score = 7;
    score = score + 5;
    score = score - 2;
    console.log(score);
21. 21.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 2;
    runs = runs - 6;
    console.log(runs);
22. 22.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
23. 23.⚡ What number does this code print?
    let a = 53;
    let b = 21;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) Error (c) 24
25. 25.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
26. 26.⚡ What number does this code print?
    let a = 42;
    let b = 37;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 12;
    let b = 19;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 10;
    coins = coins - 15;
    console.log(coins);
29. 29.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) let (d) console.log()
30. 30.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 9;
    marks = marks - 18;
    console.log(marks);
31. 31.⚡ What number does this code print?
    let a = 5;
    let b = 24;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 6;
    apples = apples - 8;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 7;
    marks = marks - 29;
    console.log(marks);
34. 34.⚡ What number does this code print?
    let score = 15;
    score = score + 4;
    score = score - 17;
    console.log(score);
35. 35.⚡ What number does this code print?
    let a = 37;
    let b = 24;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 22;
    let b = 22;
    console.log(a - b);
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Aman! (d) Aman
38. 38.⚡ What number does this code print?
    let score = 9;
    score = score + 13;
    score = score - 10;
    console.log(score);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 17 (b) 98 (c) Error
40. 40.⚡ What number does this code print?
    let books = 21;
    books = books + 13;
    books = books - 9;
    console.log(books);

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