JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 899 · 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 writes in the console? (a) if (b) let (c) alert() (d) console.log()
2. 2.⚡ Which JavaScript word repeats code? (a) if (b) let (c) alert() (d) for
3. 3.⚡ What number does this code print?
   let apples = 18;
   apples = apples + 10;
   apples = apples - 16;
   console.log(apples);
4. 4.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
5. 5.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) name (c) Zoya (d) Hi, name!
7. 7.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) alert() (d) if
8. 8.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, name! (d) Hello, Arjun!
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 5;
   console.log(x + y); (a) 75 (b) Error (c) 12
10. 10.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
11. 11.⚡ What number does this code print?
    let a = 8;
    let b = 29;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let score = 11;
    score = score + 6;
    score = score - 10;
    console.log(score);
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) if (d) let
14. 14.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) console.log()
15. 15.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
16. 16.⚡ What number does this code print?
    let books = 26;
    books = books + 5;
    books = books - 9;
    console.log(books);
17. 17.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) name (d) Aman
18. 18.⚡ What number does this code print?
    let a = 27;
    let b = 8;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 10;
    apples = apples - 23;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let a = 3;
    let b = 5;
    console.log(a * b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 66 (b) Error (c) 12
23. 23.⚡ What number does this code print?
    let a = 51;
    let b = 8;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
25. 25.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) Arjun (c) name (d) Well done, name!
26. 26.⚡ What number does this code print?
    let a = 12;
    let b = 35;
    console.log(a + b);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) Hi, Arjun! (d) name
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
29. 29.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
30. 30.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
31. 31.⚡ What number does this code print?
    let a = 45;
    let b = 31;
    console.log(a + b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 24 (b) 6 (c) Error
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, name! (d) Welcome, Zoya!
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) Error (b) 18 (c) 99
35. 35.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 5;
    coins = coins - 15;
    console.log(coins);
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, name! (c) name (d) Hi, Meera!
37. 37.⚡ What number does this code print?
    let score = 13;
    score = score + 6;
    score = score - 17;
    console.log(score);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) 64 (c) Error
39. 39.⚡ What number does this code print?
    let a = 22;
    let b = 19;
    console.log(a - b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 82 (c) 10

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