JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 509 · 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 = 5;
   let b = 24;
   console.log(a + b);
2. 2.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) for (d) console.log()
3. 3.⚡ What number does this code print?
   let a = 12;
   let b = 38;
   console.log(a + b);
4. 4.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Arjun (d) Welcome, Arjun!
5. 5.⚡ What number does this code print?
   let runs = 6;
   runs = runs + 16;
   runs = runs - 8;
   console.log(runs);
6. 6.⚡ What number does this code print?
   let a = 56;
   let b = 3;
   console.log(a + b);
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
8. 8.⚡ What number does this code print?
   let a = 7;
   let b = 4;
   console.log(a * b);
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) for (d) alert()
10. 10.⚡ What number does this code print?
    let a = 45;
    let b = 20;
    console.log(a + b);
11. 11.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, Aman! (d) Welcome, name!
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) 4 (c) Error
13. 13.⚡ What number does this code print?
    let books = 30;
    books = books + 13;
    books = books - 22;
    console.log(books);
14. 14.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
15. 15.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) 10 (c) Error
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 15 (b) Error (c) 69
18. 18.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) let
19. 19.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 7;
    marks = marks - 1;
    console.log(marks);
20. 20.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
21. 21.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 12;
    apples = apples - 6;
    console.log(apples);
22. 22.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 7;
    marks = marks - 25;
    console.log(marks);
23. 23.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 2;
    runs = runs - 6;
    console.log(runs);
24. 24.⚡ What number does this code print?
    let a = 50;
    let b = 7;
    console.log(a + b);
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
26. 26.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) let (d) console.log()
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) name (d) Aman
28. 28.⚡ What number does this code print?
    let books = 29;
    books = books + 6;
    books = books - 7;
    console.log(books);
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
30. 30.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 6;
    apples = apples - 10;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 19;
    apples = apples - 2;
    console.log(apples);
32. 32.⚡ What number does this code print?
    let score = 10;
    score = score + 14;
    score = score - 2;
    console.log(score);
33. 33.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Arjun (d) Well done, Arjun!
34. 34.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 12;
    marks = marks - 38;
    console.log(marks);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 47 (c) 11
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Kabir! (d) Kabir
37. 37.⚡ What number does this code print?
    let books = 24;
    books = books + 7;
    books = books - 27;
    console.log(books);
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) name (d) Riya
39. 39.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) console.log() (d) for
40. 40.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);

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