JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 305 · 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 = "Zoya";
   alert("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Zoya (d) Hi, name!
2. 2.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Meera (d) Hello, Meera!
3. 3.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) if (d) let
4. 4.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
5. 5.⚡ What number does this code print?
   let runs = 27;
   runs = runs + 11;
   runs = runs - 33;
   console.log(runs);
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, Zoya! (c) Welcome, name! (d) name
7. 7.⚡ What number does this code print?
   let a = 7;
   let b = 4;
   console.log(a * b);
8. 8.⚡ What number does this code print?
   let score = 11;
   score = score + 5;
   score = score - 11;
   console.log(score);
9. 9.⚡ What number does this code print?
   let score = 5;
   score = score + 15;
   score = score - 11;
   console.log(score);
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
11. 11.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) if (d) console.log()
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) let
13. 13.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 10;
    coins = coins - 27;
    console.log(coins);
14. 14.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 18;
    apples = apples - 14;
    console.log(apples);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) 15 (c) Error
16. 16.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) Error (c) 85
18. 18.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
21. 21.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
22. 22.⚡ Which JavaScript word repeats code? (a) let (b) for (c) if (d) console.log()
23. 23.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 6;
    coins = coins - 19;
    console.log(coins);
24. 24.⚡ What number does this code print?
    let a = 36;
    let b = 40;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let a = 24;
    let b = 26;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, Riya! (d) Welcome, name!
28. 28.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) console.log() (d) if
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 94 (c) 13
30. 30.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 84 (b) 12 (c) Error
32. 32.⚡ What number does this code print?
    let a = 17;
    let b = 3;
    console.log(a + b);
33. 33.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
34. 34.⚡ What number does this code print?
    let score = 24;
    score = score + 13;
    score = score - 4;
    console.log(score);
35. 35.⚡ What number does this code print?
    let books = 13;
    books = books + 12;
    books = books - 2;
    console.log(books);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) 71 (c) Error
37. 37.⚡ What number does this code print?
    let a = 26;
    let b = 15;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 16;
    let b = 11;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 13;
    coins = coins - 12;
    console.log(coins);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) Error (b) 10 (c) 64

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