JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 527 · 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 runs = 30;
   runs = runs + 18;
   runs = runs - 47;
   console.log(runs);
2. 2.⚡ What number does this code print?
   let a = 37;
   let b = 2;
   console.log(a + b);
3. 3.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
4. 4.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) if (d) for
5. 5.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
6. 6.⚡ What number does this code print?
   let a = 21;
   let b = 4;
   console.log(a - b);
7. 7.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) console.log()
8. 8.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
9. 9.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) for
11. 11.⚡ What number does this code print?
    let a = 59;
    let b = 3;
    console.log(a - b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 9 (c) 72
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
14. 14.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
15. 15.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Meera! (d) Meera
16. 16.⚡ What number does this code print?
    let a = 50;
    let b = 15;
    console.log(a + b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 84 (b) Error (c) 12
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
19. 19.⚡ What number does this code print?
    let a = 46;
    let b = 5;
    console.log(a - b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 7 (c) 61
21. 21.⚡ What number does this code print?
    let a = 10;
    let b = 21;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 2;
    apples = apples - 4;
    console.log(apples);
23. 23.⚡ What number does this code print?
    let a = 27;
    let b = 16;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let a = 30;
    let b = 3;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Zoya! (d) Zoya
26. 26.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 12;
    apples = apples - 36;
    console.log(apples);
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Hello, name! (d) Aman
28. 28.⚡ What number does this code print?
    let a = 57;
    let b = 12;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) 6 (c) Error
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) 63 (c) Error
31. 31.⚡ What number does this code print?
    let score = 19;
    score = score + 16;
    score = score - 7;
    console.log(score);
32. 32.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) if
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) 94 (c) Error
34. 34.⚡ What number does this code print?
    let a = 41;
    let b = 11;
    console.log(a + b);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Meera (d) Hello, Meera!
37. 37.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 7;
    apples = apples - 17;
    console.log(apples);
38. 38.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 2;
    apples = apples - 2;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let books = 5;
    books = books + 9;
    books = books - 3;
    console.log(books);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 17 (b) Error (c) 89

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