JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 213 · 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) actions and changes (b) the page title (c) only colours (d) the domain name
2. 2.⚡ 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
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) if (d) console.log()
4. 4.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
5. 5.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) console.log()
6. 6.⚡ What number does this code print?
   let a = 6;
   let b = 4;
   console.log(a * b);
7. 7.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
8. 8.⚡ What number does this code print?
   let a = 45;
   let b = 38;
   console.log(a + b);
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) name (d) Aman
10. 10.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
11. 11.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Zoya (d) Well done, Zoya!
12. 12.⚡ What number does this code print?
    let score = 14;
    score = score + 7;
    score = score - 3;
    console.log(score);
13. 13.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) alert()
14. 14.⚡ What number does this code print?
    let books = 9;
    books = books + 18;
    books = books - 7;
    console.log(books);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) 32 (c) Error
16. 16.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let a = 39;
    let b = 30;
    console.log(a - b);
18. 18.⚡ What number does this code print?
    let a = 47;
    let b = 23;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) name (d) Riya
20. 20.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
21. 21.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 7;
    apples = apples - 13;
    console.log(apples);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) 67 (c) Error
23. 23.⚡ What number does this code print?
    let a = 13;
    let b = 5;
    console.log(a + b);
24. 24.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) if
25. 25.⚡ What number does this code print?
    let a = 40;
    let b = 8;
    console.log(a - b);
26. 26.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) Error (c) 73
28. 28.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) for (d) alert()
29. 29.⚡ What number does this code print?
    let a = 45;
    let b = 23;
    console.log(a + b);
30. 30.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) name (d) Well done, name!
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 = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
33. 33.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 12;
    coins = coins - 3;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 14;
    let b = 13;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 59;
    let b = 34;
    console.log(a - b);
37. 37.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
38. 38.⚡ What number does this code print?
    let a = 38;
    let b = 13;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 13;
    runs = runs - 4;
    console.log(runs);

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