JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 745 · 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 apples = 20;
   apples = apples + 8;
   apples = apples - 22;
   console.log(apples);
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) alert() (d) let
3. 3.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
4. 4.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) console.log() (d) for
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 5;
   console.log(x + y); (a) 75 (b) Error (c) 12
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) Error (b) 5 (c) 32
7. 7.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, Arjun! (c) Arjun (d) Welcome, name!
8. 8.⚡ What number does this code print?
   let score = 21;
   score = score + 16;
   score = score - 6;
   console.log(score);
9. 9.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
10. 10.⚡ What number does this code print?
    let score = 7;
    score = score + 15;
    score = score - 11;
    console.log(score);
11. 11.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 65 (b) Error (c) 11
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
15. 15.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) if
16. 16.⚡ What number does this code print?
    let a = 46;
    let b = 18;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 11;
    apples = apples - 34;
    console.log(apples);
18. 18.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
19. 19.⚡ What number does this code print?
    let a = 3;
    let b = 6;
    console.log(a * b);
20. 20.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) let (d) if
21. 21.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 35;
    let b = 33;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 15;
    let b = 8;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 6;
    runs = runs - 11;
    console.log(runs);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 16 (b) 7 (c) Error
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) Error (b) 98 (c) 17
27. 27.⚡ What number does this code print?
    let books = 13;
    books = books + 2;
    books = books - 11;
    console.log(books);
28. 28.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
29. 29.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
30. 30.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a * b);
31. 31.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Kabir (d) Welcome, name!
32. 32.⚡ What number does this code print?
    let a = 12;
    let b = 6;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 58;
    let b = 34;
    console.log(a - b);
34. 34.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
35. 35.⚡ 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
36. 36.⚡ What number does this code print?
    let score = 29;
    score = score + 2;
    score = score - 14;
    console.log(score);
37. 37.⚡ What number does this code print?
    let a = 30;
    let b = 12;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) Hello, name! (d) name
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) Error (c) 61
40. 40.⚡ 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

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