JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 848 · 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 = 12;
   let b = 11;
   console.log(a - b);
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) Kabir (d) name
3. 3.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) name (d) Hello, name!
4. 4.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Hi, name! (d) Meera
5. 5.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) console.log() (d) for
6. 6.⚡ What number does this code print?
   let apples = 11;
   apples = apples + 3;
   apples = apples - 11;
   console.log(apples);
7. 7.⚡ What number does this code print?
   let a = 10;
   let b = 4;
   console.log(a - b);
8. 8.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
9. 9.⚡ What number does this code print?
   let a = 3;
   let b = 3;
   console.log(a * b);
10. 10.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
11. 11.⚡ What number does this code print?
    let a = 27;
    let b = 31;
    console.log(a + b);
12. 12.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) for (d) let
13. 13.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) Welcome, Zoya! (d) name
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) alert() (d) let
15. 15.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 5;
    apples = apples - 12;
    console.log(apples);
16. 16.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Kabir! (d) Kabir
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 8 (b) 26 (c) Error
18. 18.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) alert() (d) let
19. 19.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 25 (b) 7 (c) Error
21. 21.⚡ What number does this code print?
    let a = 13;
    let b = 31;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let a = 11;
    let b = 8;
    console.log(a * b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) Error (c) 10
24. 24.⚡ What number does this code print?
    let a = 18;
    let b = 3;
    console.log(a + b);
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
28. 28.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 5;
    apples = apples - 4;
    console.log(apples);
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, Zoya! (c) Welcome, name! (d) name
30. 30.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 3;
    marks = marks - 6;
    console.log(marks);
31. 31.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 5;
    marks = marks - 8;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let books = 5;
    books = books + 4;
    books = books - 4;
    console.log(books);
33. 33.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) console.log() (d) for
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) Error (c) 10
35. 35.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 4;
    runs = runs - 21;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 6;
    runs = runs - 30;
    console.log(runs);
37. 37.⚡ What number does this code print?
    let a = 30;
    let b = 27;
    console.log(a - b);
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Riya! (c) Riya (d) Well done, name!
39. 39.⚡ What number does this code print?
    let a = 16;
    let b = 14;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 6;
    marks = marks - 16;
    console.log(marks);

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