JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 98 · 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 tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
2. 2.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) alert() (d) if
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 7;
   console.log(x + y); (a) 37 (b) 10 (c) Error
4. 4.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
5. 5.⚡ What number does this code print?
   let a = 12;
   let b = 4;
   console.log(a * b);
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) console.log() (d) alert()
7. 7.⚡ What number does this code print?
   let a = 14;
   let b = 8;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let books = 18;
   books = books + 19;
   books = books - 11;
   console.log(books);
9. 9.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) if
10. 10.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a * b);
11. 11.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Zoya! (d) Zoya
12. 12.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) let
13. 13.⚡ What number does this code print?
    let a = 48;
    let b = 7;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 10;
    let b = 4;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 14;
    apples = apples - 8;
    console.log(apples);
16. 16.⚡ What number does this code print?
    let a = 45;
    let b = 5;
    console.log(a - b);
17. 17.⚡ 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
18. 18.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a * b);
19. 19.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) name (d) Welcome, Aman!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 68 (b) Error (c) 14
22. 22.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) console.log()
23. 23.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 26 (b) 8 (c) Error
25. 25.⚡ What number does this code print?
    let a = 40;
    let b = 12;
    console.log(a - b);
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Kabir (d) Hi, Kabir!
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
28. 28.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Zoya (d) Hi, Zoya!
30. 30.⚡ What number does this code print?
    let books = 19;
    books = books + 5;
    books = books - 2;
    console.log(books);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 7 (c) 43
32. 32.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let score = 30;
    score = score + 6;
    score = score - 4;
    console.log(score);
34. 34.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 12;
    marks = marks - 36;
    console.log(marks);
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
36. 36.⚡ What number does this code print?
    let a = 6;
    let b = 30;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 78 (b) Error (c) 15
38. 38.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) Error (b) 65 (c) 11
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!

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