JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 811 · 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.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) alert()
2. 2.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 9;
   console.log(x + y); (a) 59 (b) 14 (c) Error
4. 4.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) if
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 5;
   console.log(x + y); (a) Error (b) 7 (c) 25
6. 6.⚡ What number does this code print?
   let a = 27;
   let b = 14;
   console.log(a - b);
7. 7.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) name (d) Well done, name!
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) 8 (b) Error (c) 17
9. 9.⚡ What number does this code print?
   let a = 26;
   let b = 1;
   console.log(a - b);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) if (d) alert()
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 71 (b) 8 (c) Error
12. 12.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
13. 13.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Kabir (c) Welcome, Kabir! (d) Welcome, name!
14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) Well done, name! (c) name (d) Well done, Zoya!
15. 15.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) alert() (d) let
16. 16.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) 12 (c) Error
18. 18.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
19. 19.⚡ What number does this code print?
    let a = 36;
    let b = 32;
    console.log(a + b);
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 a = 25;
    let b = 14;
    console.log(a - b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) 8 (c) Error
23. 23.⚡ What number does this code print?
    let a = 3;
    let b = 6;
    console.log(a * b);
24. 24.⚡ Which JavaScript word repeats code? (a) if (b) for (c) console.log() (d) alert()
25. 25.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, name! (d) Hi, Arjun!
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
27. 27.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
28. 28.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 10 (c) 46
30. 30.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
31. 31.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
32. 32.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 2;
    runs = runs - 1;
    console.log(runs);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 15 (c) 6
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
35. 35.⚡ What number does this code print?
    let score = 7;
    score = score + 19;
    score = score - 10;
    console.log(score);
36. 36.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Meera (d) Hello, Meera!
37. 37.⚡ What number does this code print?
    let a = 3;
    let b = 9;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 6;
    apples = apples - 5;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let books = 29;
    books = books + 4;
    books = books - 2;
    console.log(books);
40. 40.⚡ What number does this code print?
    let a = 44;
    let b = 12;
    console.log(a + b);

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