JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 796 · 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.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) console.log() (d) let
2. 2.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) if (d) for
3. 3.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) for (d) console.log()
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) Error (b) 48 (c) 12
5. 5.⚡ What number does this code print?
   let a = 29;
   let b = 25;
   console.log(a + b);
6. 6.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) Error (b) 18 (c) 9
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 9;
   console.log(x + y); (a) Error (b) 39 (c) 12
9. 9.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) Riya (d) name
11. 11.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 18;
    marks = marks - 4;
    console.log(marks);
12. 12.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
13. 13.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Arjun! (d) Arjun
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) Error (c) 76
15. 15.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
16. 16.⚡ What number does this code print?
    let score = 29;
    score = score + 11;
    score = score - 6;
    console.log(score);
17. 17.⚡ What number does this code print?
    let books = 13;
    books = books + 13;
    books = books - 2;
    console.log(books);
18. 18.⚡ What number does this code print?
    let score = 5;
    score = score + 5;
    score = score - 9;
    console.log(score);
19. 19.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 10;
    runs = runs - 18;
    console.log(runs);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 78 (b) 15 (c) Error
21. 21.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 9;
    marks = marks - 12;
    console.log(marks);
22. 22.⚡ What number does this code print?
    let marks = 20;
    marks = marks + 14;
    marks = marks - 16;
    console.log(marks);
23. 23.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) if (d) for
24. 24.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) 10 (c) Error
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) 8 (c) Error
27. 27.⚡ What number does this code print?
    let score = 13;
    score = score + 16;
    score = score - 1;
    console.log(score);
28. 28.⚡ What number does this code print?
    let a = 58;
    let b = 35;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) name (d) Welcome, Arjun!
30. 30.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for
31. 31.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) name (d) Riya
32. 32.⚡ What number does this code print?
    let a = 28;
    let b = 24;
    console.log(a - b);
33. 33.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 67 (b) 13 (c) Error
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Zoya! (d) Zoya
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Kabir! (c) Well done, name! (d) Kabir
37. 37.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 3;
    marks = marks - 4;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 5;
    runs = runs - 6;
    console.log(runs);
39. 39.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);

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