JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 17 · 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 JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
2. 2.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
3. 3.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
4. 4.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) for
5. 5.⚡ What number does this code print?
   let coins = 13;
   coins = coins + 15;
   coins = coins - 21;
   console.log(coins);
6. 6.⚡ What number does this code print?
   let a = 29;
   let b = 25;
   console.log(a - b);
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
8. 8.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) let
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Hello, name! (c) Aman (d) name
10. 10.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
11. 11.⚡ What number does this code print?
    let a = 23;
    let b = 11;
    console.log(a + b);
12. 12.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) let (d) console.log()
13. 13.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) alert()
14. 14.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
15. 15.⚡ What number does this code print?
    let a = 45;
    let b = 5;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let a = 5;
    let b = 10;
    console.log(a * b);
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) for
18. 18.⚡ What number does this code print?
    let a = 38;
    let b = 33;
    console.log(a - b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
20. 20.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 13;
    runs = runs - 8;
    console.log(runs);
22. 22.⚡ What number does this code print?
    let a = 48;
    let b = 30;
    console.log(a - b);
23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
24. 24.⚡ What number does this code print?
    let a = 23;
    let b = 10;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 56;
    let b = 4;
    console.log(a - b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 98 (b) Error (c) 17
27. 27.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 4;
    runs = runs - 1;
    console.log(runs);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 11 (c) 83
29. 29.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, name! (d) Hi, Aman!
30. 30.⚡ What number does this code print?
    let books = 19;
    books = books + 6;
    books = books - 7;
    console.log(books);
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) Error (c) 55
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 8 (b) 17 (c) Error
34. 34.⚡ What number does this code print?
    let a = 17;
    let b = 26;
    console.log(a + b);
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Meera (d) Hi, name!
36. 36.⚡ What number does this code print?
    let score = 27;
    score = score + 16;
    score = score - 7;
    console.log(score);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) Error (b) 8 (c) 26
38. 38.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) Meera (d) name
39. 39.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, name! (d) Hello, Kabir!
40. 40.⚡ What number does this code print?
    let a = 47;
    let b = 17;
    console.log(a + b);

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