JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 85 · 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 = 7;
   let b = 4;
   console.log(a * b);
2. 2.⚡ What number does this code print?
   let coins = 27;
   coins = coins + 2;
   coins = coins - 20;
   console.log(coins);
3. 3.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Zoya (d) Welcome, Zoya!
4. 4.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) Welcome, Aman! (d) name
5. 5.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
6. 6.⚡ What number does this code print?
   let a = 33;
   let b = 7;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let marks = 21;
   marks = marks + 3;
   marks = marks - 4;
   console.log(marks);
8. 8.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) let
9. 9.⚡ What number does this code print?
   let a = 27;
   let b = 3;
   console.log(a + b);
10. 10.⚡ What number does this code print?
    let a = 32;
    let b = 26;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 19;
    runs = runs - 3;
    console.log(runs);
12. 12.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
13. 13.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) alert() (d) if
14. 14.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 13;
    apples = apples - 14;
    console.log(apples);
15. 15.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) name (d) Well done, Meera!
16. 16.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) let (d) alert()
18. 18.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 51 (b) 6 (c) Error
20. 20.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 12;
    coins = coins - 19;
    console.log(coins);
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
22. 22.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) Error (c) 86
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) Hi, Zoya! (d) name
25. 25.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 2;
    runs = runs - 1;
    console.log(runs);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 92 (b) 11 (c) Error
27. 27.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) Error (c) 47
29. 29.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) if (d) for
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 9 (c) 27
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) 16 (b) 79 (c) Error
32. 32.⚡ What number does this code print?
    let books = 27;
    books = books + 11;
    books = books - 15;
    console.log(books);
33. 33.⚡ What number does this code print?
    let a = 11;
    let b = 18;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 94 (b) 13 (c) Error
35. 35.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) name (d) Hi, Arjun!
36. 36.⚡ What number does this code print?
    let a = 31;
    let b = 27;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 49 (b) 13 (c) Error
38. 38.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
39. 39.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 9;
    runs = runs - 13;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 11;
    apples = apples - 20;
    console.log(apples);

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