JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 561 · 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 print? (Look at the quotes!)
   let x = "3";
   let y = 7;
   console.log(x + y); (a) 37 (b) 10 (c) Error
2. 2.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) let (d) if
3. 3.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
4. 4.⚡ What number does this code print?
   let coins = 9;
   coins = coins + 9;
   coins = coins - 3;
   console.log(coins);
5. 5.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 3;
   console.log(x + y); (a) Error (b) 93 (c) 12
7. 7.⚡ What number does this code print?
   let score = 8;
   score = score + 16;
   score = score - 23;
   console.log(score);
8. 8.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, name! (d) Hi, Aman!
10. 10.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 8;
    apples = apples - 5;
    console.log(apples);
11. 11.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) if (d) console.log()
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
13. 13.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
14. 14.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 22 (b) 4 (c) Error
16. 16.⚡ What number does this code print?
    let books = 12;
    books = books + 10;
    books = books - 12;
    console.log(books);
17. 17.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) let (d) console.log()
18. 18.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
19. 19.⚡ What number does this code print?
    let a = 30;
    let b = 19;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 6;
    runs = runs - 25;
    console.log(runs);
21. 21.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Zoya (d) Well done, Zoya!
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 43 (b) Error (c) 7
23. 23.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
24. 24.⚡ What number does this code print?
    let a = 36;
    let b = 20;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let a = 39;
    let b = 24;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) 85 (c) Error
27. 27.⚡ What number does this code print?
    let a = 25;
    let b = 6;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let score = 23;
    score = score + 16;
    score = score - 8;
    console.log(score);
29. 29.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) let
30. 30.⚡ What number does this code print?
    let a = 21;
    let b = 12;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 17;
    marks = marks - 20;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let a = 26;
    let b = 3;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 43;
    let b = 20;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 16;
    coins = coins - 36;
    console.log(coins);
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Aman (d) Hi, Aman!
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) 9 (c) Error
37. 37.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 12;
    let b = 7;
    console.log(a - b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 36 (c) 9
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) 35 (c) Error

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