JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 529 · 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 = 15;
   let b = 38;
   console.log(a + b);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 5;
   console.log(x + y); (a) Error (b) 35 (c) 8
3. 3.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
4. 4.⚡ What number does this code print?
   let a = 35;
   let b = 25;
   console.log(a - b);
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) let
6. 6.⚡ What number does this code print?
   let a = 12;
   let b = 3;
   console.log(a - b);
7. 7.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
8. 8.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) console.log()
9. 9.⚡ What number does this code print?
   let score = 24;
   score = score + 12;
   score = score - 26;
   console.log(score);
10. 10.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 19;
    apples = apples - 22;
    console.log(apples);
11. 11.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 9;
    runs = runs - 2;
    console.log(runs);
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
13. 13.⚡ What number does this code print?
    let a = 55;
    let b = 8;
    console.log(a + b);
14. 14.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) console.log() (d) for
15. 15.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 18;
    runs = runs - 22;
    console.log(runs);
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
17. 17.⚡ What number does this code print?
    let a = 17;
    let b = 1;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let a = 32;
    let b = 22;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name
20. 20.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
21. 21.⚡ 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
22. 22.⚡ 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
23. 23.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 18;
    runs = runs - 4;
    console.log(runs);
24. 24.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
25. 25.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
26. 26.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) alert() (d) console.log()
27. 27.⚡ What number does this code print?
    let books = 29;
    books = books + 7;
    books = books - 11;
    console.log(books);
28. 28.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) if
29. 29.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) name (d) Well done, Aman!
30. 30.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
31. 31.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) Hi, Riya! (d) name
32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, Zoya! (d) Welcome, name!
33. 33.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 4;
    runs = runs - 4;
    console.log(runs);
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, name! (d) Welcome, Aman!
35. 35.⚡ What number does this code print?
    let a = 60;
    let b = 39;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let score = 20;
    score = score + 8;
    score = score - 18;
    console.log(score);
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) name (d) Hi, Riya!
38. 38.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 18;
    coins = coins - 17;
    console.log(coins);
39. 39.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 7;
    apples = apples - 11;
    console.log(apples);
40. 40.⚡ 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

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