JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 336 · 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 = 46;
   let b = 4;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let score = 29;
   score = score + 6;
   score = score - 23;
   console.log(score);
3. 3.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
4. 4.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) if (d) for
5. 5.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
6. 6.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
7. 7.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Zoya (d) Hello, Zoya!
8. 8.⚡ What number does this code print?
   let a = 27;
   let b = 15;
   console.log(a - b);
9. 9.⚡ What number does this code print?
   let apples = 8;
   apples = apples + 13;
   apples = apples - 10;
   console.log(apples);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) Error (b) 16 (c) 97
11. 11.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 9 (b) Error (c) 45
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) console.log() (d) alert()
14. 14.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
15. 15.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 14;
    runs = runs - 17;
    console.log(runs);
16. 16.⚡ What number does this code print?
    let a = 15;
    let b = 2;
    console.log(a + b);
17. 17.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) for
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
19. 19.⚡ What number does this code print?
    let a = 41;
    let b = 32;
    console.log(a + b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) Error (b) 7 (c) 52
21. 21.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 6 (c) 51
23. 23.⚡ What number does this code print?
    let a = 60;
    let b = 20;
    console.log(a + b);
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) Welcome, name! (d) name
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 10 (c) 19
26. 26.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Aman (c) Well done, name! (d) name
27. 27.⚡ What number does this code print?
    let books = 13;
    books = books + 10;
    books = books - 1;
    console.log(books);
28. 28.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 58;
    let b = 33;
    console.log(a + b);
30. 30.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) let
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Hello, name! (d) Aman
32. 32.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 16;
    runs = runs - 8;
    console.log(runs);
33. 33.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) let (d) for
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 10 (b) Error (c) 37
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) Error (c) 8
36. 36.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Zoya! (c) Well done, name! (d) Zoya
37. 37.⚡ What number does this code print?
    let a = 8;
    let b = 7;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 37;
    let b = 33;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 13;
    coins = coins - 41;
    console.log(coins);
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) name (d) Well done, Riya!

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