JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 659 · 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 = 32;
   let b = 14;
   console.log(a + b);
2. 2.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
3. 3.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Hello, name! (d) Riya
4. 4.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) console.log()
5. 5.⚡ What number does this code print?
   let books = 23;
   books = books + 18;
   books = books - 5;
   console.log(books);
6. 6.⚡ What number does this code print?
   let apples = 20;
   apples = apples + 3;
   apples = apples - 22;
   console.log(apples);
7. 7.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Zoya (c) Well done, name! (d) name
8. 8.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) if
9. 9.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
10. 10.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 7;
    apples = apples - 16;
    console.log(apples);
11. 11.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 4;
    runs = runs - 9;
    console.log(runs);
12. 12.⚡ Which JavaScript word repeats code? (a) if (b) for (c) console.log() (d) let
13. 13.⚡ What number does this code print?
    let a = 26;
    let b = 39;
    console.log(a + b);
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) for
16. 16.⚡ What number does this code print?
    let a = 17;
    let b = 19;
    console.log(a + b);
17. 17.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) let (d) alert()
18. 18.⚡ 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
19. 19.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
20. 20.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Arjun (d) Hi, name!
21. 21.⚡ What number does this code print?
    let a = 48;
    let b = 34;
    console.log(a + b);
22. 22.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
23. 23.⚡ What number does this code print?
    let a = 25;
    let b = 12;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 46 (b) Error (c) 10
25. 25.⚡ What number does this code print?
    let a = 40;
    let b = 39;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let runs = 18;
    runs = runs + 17;
    runs = runs - 11;
    console.log(runs);
27. 27.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, Aman! (c) name (d) Well done, name!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) Error (c) 28
29. 29.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 18;
    marks = marks - 24;
    console.log(marks);
30. 30.⚡ What number does this code print?
    let books = 20;
    books = books + 11;
    books = books - 5;
    console.log(books);
31. 31.⚡ What number does this code print?
    let a = 48;
    let b = 20;
    console.log(a + b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32
33. 33.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
34. 34.⚡ What number does this code print?
    let a = 44;
    let b = 34;
    console.log(a - b);
35. 35.⚡ 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
36. 36.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 11;
    apples = apples - 31;
    console.log(apples);
37. 37.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Zoya (d) Hello, name!
38. 38.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Arjun (d) Well done, name!
39. 39.⚡ What number does this code print?
    let a = 9;
    let b = 10;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, name! (d) Hi, Meera!

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