JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 613 · 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 does this code print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) Error (b) 18 (c) 9
2. 2.⚡ What number does this code print?
   let a = 8;
   let b = 25;
   console.log(a + b);
3. 3.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Hello, name! (c) name (d) Aman
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) 3 (b) 21 (c) Error
5. 5.⚡ What number does this code print?
   let a = 13;
   let b = 39;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let runs = 15;
   runs = runs + 9;
   runs = runs - 14;
   console.log(runs);
7. 7.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
8. 8.⚡ What number does this code print?
   let a = 56;
   let b = 23;
   console.log(a + b);
9. 9.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) Hello, Meera! (d) name
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 14 (c) 5
11. 11.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) alert() (d) if
12. 12.⚡ What number does this code print?
    let a = 35;
    let b = 38;
    console.log(a + b);
13. 13.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
14. 14.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
15. 15.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
16. 16.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) console.log() (d) alert()
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 96 (c) 15
19. 19.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 34 (b) Error (c) 7
21. 21.⚡ What number does this code print?
    let a = 56;
    let b = 24;
    console.log(a - b);
22. 22.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
23. 23.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 11;
    marks = marks - 14;
    console.log(marks);
24. 24.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 17;
    apples = apples - 7;
    console.log(apples);
25. 25.⚡ What number does this code print?
    let books = 5;
    books = books + 16;
    books = books - 7;
    console.log(books);
26. 26.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) Well done, name! (d) name
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 85 (b) Error (c) 13
28. 28.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Hello, name! (d) Meera
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) 53 (c) Error
30. 30.⚡ What number does this code print?
    let score = 24;
    score = score + 4;
    score = score - 8;
    console.log(score);
31. 31.⚡ What number does this code print?
    let a = 27;
    let b = 6;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let score = 17;
    score = score + 16;
    score = score - 4;
    console.log(score);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) Error (b) 11 (c) 38
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
35. 35.⚡ What number does this code print?
    let books = 13;
    books = books + 10;
    books = books - 16;
    console.log(books);
36. 36.⚡ What number does this code print?
    let a = 20;
    let b = 5;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 8;
    runs = runs - 17;
    console.log(runs);
38. 38.⚡ What number does this code print?
    let a = 7;
    let b = 12;
    console.log(a * b);
39. 39.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) alert() (d) let
40. 40.⚡ What number does this code print?
    let a = 44;
    let b = 36;
    console.log(a + b);

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