JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 21 · 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 = 54;
   let b = 16;
   console.log(a + b);
2. 2.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 3;
   console.log(x + y); (a) Error (b) 8 (c) 53
4. 4.⚡ What number does this code print?
   let a = 54;
   let b = 12;
   console.log(a - b);
5. 5.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
6. 6.⚡ What number does this code print?
   let coins = 13;
   coins = coins + 18;
   coins = coins - 30;
   console.log(coins);
7. 7.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
8. 8.⚡ What number does this code print?
   let a = 26;
   let b = 21;
   console.log(a - b);
9. 9.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Kabir (c) Welcome, name! (d) Welcome, Kabir!
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 16 (b) 88 (c) Error
12. 12.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 12;
    runs = runs - 19;
    console.log(runs);
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
14. 14.⚡ What number does this code print?
    let a = 37;
    let b = 14;
    console.log(a + b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 85 (b) 13 (c) Error
16. 16.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, name! (d) Hi, Zoya!
17. 17.⚡ What number does this code print?
    let a = 37;
    let b = 7;
    console.log(a - b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) Error (c) 73
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) Error (c) 18
20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Meera! (d) Meera
21. 21.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) console.log() (d) let
22. 22.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) if (d) for
23. 23.⚡ What number does this code print?
    let a = 52;
    let b = 32;
    console.log(a - b);
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Aman (d) Welcome, name!
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) name (d) Hello, name!
26. 26.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
27. 27.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
28. 28.⚡ 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
29. 29.⚡ What number does this code print?
    let books = 5;
    books = books + 5;
    books = books - 2;
    console.log(books);
30. 30.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) alert() (d) console.log()
31. 31.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a + b);
32. 32.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) for (d) if
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) 66 (c) Error
34. 34.⚡ What number does this code print?
    let a = 40;
    let b = 17;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let score = 7;
    score = score + 17;
    score = score - 2;
    console.log(score);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) Error (c) 6
37. 37.⚡ What number does this code print?
    let a = 49;
    let b = 5;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Meera! (d) Meera
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 15 (c) 96

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