JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 747 · 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 does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Meera! (c) name (d) Meera
2. 2.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
3. 3.⚡ What number does this code print?
   let books = 22;
   books = books + 8;
   books = books - 26;
   console.log(books);
4. 4.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Hello, name! (d) Riya
5. 5.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) console.log()
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 6;
   console.log(x + y); (a) 7 (b) Error (c) 16
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) for
8. 8.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) console.log()
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 1;
   console.log(x + y); (a) Error (b) 71 (c) 8
10. 10.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) Zoya (d) name
11. 11.⚡ What number does this code print?
    let a = 9;
    let b = 9;
    console.log(a * b);
12. 12.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) Welcome, Arjun! (d) name
13. 13.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) Error (c) 25
15. 15.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 7;
    coins = coins - 11;
    console.log(coins);
16. 16.⚡ What number does this code print?
    let a = 21;
    let b = 8;
    console.log(a - b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) 58 (c) Error
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
19. 19.⚡ What number does this code print?
    let a = 37;
    let b = 28;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 5;
    runs = runs - 14;
    console.log(runs);
21. 21.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
22. 22.⚡ What number does this code print?
    let a = 20;
    let b = 13;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 10;
    let b = 4;
    console.log(a * b);
24. 24.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
26. 26.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
27. 27.⚡ What number does this code print?
    let a = 20;
    let b = 1;
    console.log(a + b);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) Welcome, Zoya! (c) Welcome, name! (d) name
29. 29.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) name (d) Hi, Arjun!
30. 30.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) for (d) let
31. 31.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) Riya (d) name
33. 33.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) let
34. 34.⚡ What number does this code print?
    let a = 40;
    let b = 2;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let score = 16;
    score = score + 19;
    score = score - 24;
    console.log(score);
36. 36.⚡ What number does this code print?
    let a = 15;
    let b = 31;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 11;
    let b = 16;
    console.log(a + b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 75 (b) Error (c) 12
39. 39.⚡ What number does this code print?
    let a = 53;
    let b = 3;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) Error (b) 13 (c) 85

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