JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 616 · 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 makes a new variable? (a) alert() (b) let (c) console.log() (d) if
2. 2.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
3. 3.⚡ What number does this code print?
   let apples = 8;
   apples = apples + 20;
   apples = apples - 21;
   console.log(apples);
4. 4.⚡ What number does this code print?
   let marks = 29;
   marks = marks + 6;
   marks = marks - 34;
   console.log(marks);
5. 5.⚡ What number does this code print?
   let marks = 12;
   marks = marks + 17;
   marks = marks - 1;
   console.log(marks);
6. 6.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) for (d) alert()
8. 8.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) name (d) Riya
9. 9.⚡ What number does this code print?
   let a = 52;
   let b = 22;
   console.log(a - b);
10. 10.⚡ What number does this code print?
    let a = 22;
    let b = 11;
    console.log(a + b);
11. 11.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
12. 12.⚡ What number does this code print?
    let a = 53;
    let b = 21;
    console.log(a + b);
13. 13.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
14. 14.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 14;
    coins = coins - 12;
    console.log(coins);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) Error (c) 35
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) Error (c) 4
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 8 (c) 53
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
19. 19.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) alert() (d) let
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) Error (c) 11
21. 21.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Kabir (d) Well done, Kabir!
22. 22.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a * b);
23. 23.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) name (c) Meera (d) Well done, name!
24. 24.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 2;
    apples = apples - 6;
    console.log(apples);
25. 25.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 9;
    marks = marks - 9;
    console.log(marks);
26. 26.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) let
27. 27.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) Welcome, name! (d) name
28. 28.⚡ What number does this code print?
    let a = 45;
    let b = 26;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) Well done, Zoya! (d) name
30. 30.⚡ What number does this code print?
    let a = 53;
    let b = 40;
    console.log(a + b);
31. 31.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) let
32. 32.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 19;
    marks = marks - 28;
    console.log(marks);
33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
34. 34.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 6;
    coins = coins - 15;
    console.log(coins);
35. 35.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) Welcome, Aman! (d) name
36. 36.⚡ What number does this code print?
    let a = 2;
    let b = 7;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 41;
    let b = 7;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 32;
    let b = 20;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 17;
    marks = marks - 15;
    console.log(marks);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 7 (c) 43

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