JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 563 · 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 apples = 16;
   apples = apples + 3;
   apples = apples - 17;
   console.log(apples);
2. 2.⚡ What number does this code print?
   let a = 44;
   let b = 20;
   console.log(a + b);
3. 3.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
4. 4.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 9;
   console.log(x + y); (a) 18 (b) Error (c) 99
6. 6.⚡ What number does this code print?
   let score = 24;
   score = score + 9;
   score = score - 19;
   console.log(score);
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
8. 8.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Riya (d) Well done, Riya!
9. 9.⚡ What number does this code print?
   let a = 54;
   let b = 25;
   console.log(a - b);
10. 10.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 86 (b) 14 (c) Error
12. 12.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for
13. 13.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 11;
    marks = marks - 16;
    console.log(marks);
14. 14.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) let (d) if
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) for (d) let
16. 16.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 9;
    runs = runs - 4;
    console.log(runs);
17. 17.⚡ What number does this code print?
    let score = 12;
    score = score + 20;
    score = score - 1;
    console.log(score);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) Error (b) 8 (c) 17
19. 19.⚡ What number does this code print?
    let a = 44;
    let b = 40;
    console.log(a - b);
20. 20.⚡ What number does this code print?
    let a = 57;
    let b = 12;
    console.log(a - b);
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
22. 22.⚡ What number does this code print?
    let a = 19;
    let b = 4;
    console.log(a - b);
23. 23.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) name (d) Well done, Kabir!
24. 24.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Meera (d) Well done, Meera!
26. 26.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
28. 28.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) name (d) Hi, name!
29. 29.⚡ What number does this code print?
    let books = 27;
    books = books + 10;
    books = books - 33;
    console.log(books);
30. 30.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
31. 31.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) Error (c) 44
33. 33.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 9;
    runs = runs - 4;
    console.log(runs);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) Error (c) 19
35. 35.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) for (d) alert()
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 9 (c) 36
37. 37.⚡ What number does this code print?
    let a = 17;
    let b = 6;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 15;
    let b = 2;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 7;
    apples = apples - 2;
    console.log(apples);
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!

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