JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 383 · 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 = 8;
   let b = 3;
   console.log(a * b);
2. 2.⚡ What number does this code print?
   let a = 4;
   let b = 6;
   console.log(a * b);
3. 3.⚡ What number does this code print?
   let score = 9;
   score = score + 4;
   score = score - 12;
   console.log(score);
4. 4.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
5. 5.⚡ What number does this code print?
   let a = 41;
   let b = 12;
   console.log(a - b);
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) console.log() (d) alert()
7. 7.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, Kabir! (d) Hi, name!
8. 8.⚡ What number does this code print?
   let a = 37;
   let b = 18;
   console.log(a - b);
9. 9.⚡ What does this code show?
   let name = "Meera";
   console.log("Well done, " + name + "!"); (a) Meera (b) name (c) Well done, name! (d) Well done, Meera!
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) Error (c) 5
11. 11.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) let
12. 12.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, name! (d) Well done, Arjun!
13. 13.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 12;
    runs = runs - 4;
    console.log(runs);
14. 14.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Hello, name! (d) Aman
15. 15.⚡ What number does this code print?
    let books = 11;
    books = books + 9;
    books = books - 6;
    console.log(books);
16. 16.⚡ What number does this code print?
    let a = 59;
    let b = 31;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let a = 29;
    let b = 23;
    console.log(a - b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 24 (b) Error (c) 6
19. 19.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 8 (b) 26 (c) Error
23. 23.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) alert() (d) let
24. 24.⚡ What number does this code print?
    let books = 28;
    books = books + 20;
    books = books - 7;
    console.log(books);
25. 25.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
26. 26.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
27. 27.⚡ Which JavaScript word repeats code? (a) let (b) if (c) console.log() (d) for
28. 28.⚡ What number does this code print?
    let a = 40;
    let b = 5;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) name (d) Hello, Meera!
30. 30.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Riya! (d) Riya
31. 31.⚡ What number does this code print?
    let a = 2;
    let b = 9;
    console.log(a * b);
32. 32.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
33. 33.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
34. 34.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 7;
    apples = apples - 18;
    console.log(apples);
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
36. 36.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 8;
    runs = runs - 13;
    console.log(runs);
37. 37.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 7 (b) 16 (c) Error
39. 39.⚡ What number does this code print?
    let a = 56;
    let b = 28;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 13;
    apples = apples - 6;
    console.log(apples);

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