JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 638 · 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.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) if
2. 2.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Hi, name! (d) Meera
3. 3.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 9;
   console.log(x + y); (a) Error (b) 99 (c) 18
5. 5.⚡ What number does this code print?
   let books = 10;
   books = books + 15;
   books = books - 17;
   console.log(books);
6. 6.⚡ What number does this code print?
   let marks = 13;
   marks = marks + 5;
   marks = marks - 3;
   console.log(marks);
7. 7.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, name! (d) Welcome, Aman!
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 8;
   console.log(x + y); (a) 15 (b) 78 (c) Error
9. 9.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) if (d) alert()
10. 10.⚡ What number does this code print?
    let a = 32;
    let b = 16;
    console.log(a - b);
11. 11.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) for (d) let
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
13. 13.⚡ What number does this code print?
    let score = 23;
    score = score + 15;
    score = score - 11;
    console.log(score);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) Error (c) 64
15. 15.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 15;
    apples = apples - 2;
    console.log(apples);
16. 16.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 13;
    apples = apples - 16;
    console.log(apples);
17. 17.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Meera (d) Hello, Meera!
18. 18.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) console.log()
19. 19.⚡ What number does this code print?
    let books = 7;
    books = books + 4;
    books = books - 1;
    console.log(books);
20. 20.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 3;
    let b = 7;
    console.log(a * b);
22. 22.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
23. 23.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 20;
    apples = apples - 24;
    console.log(apples);
24. 24.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
25. 25.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
27. 27.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) let (d) console.log()
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
29. 29.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
30. 30.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 13 (c) 94
32. 32.⚡ What number does this code print?
    let a = 13;
    let b = 8;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 12;
    runs = runs - 3;
    console.log(runs);
34. 34.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 9;
    marks = marks - 21;
    console.log(marks);
35. 35.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let a = 19;
    let b = 29;
    console.log(a + b);
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Riya (d) Welcome, Riya!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) 23 (c) Error
39. 39.⚡ What number does this code print?
    let books = 11;
    books = books + 15;
    books = books - 22;
    console.log(books);
40. 40.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, name! (d) Well done, Aman!

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