JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 258 · 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 this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) Hi, name! (d) name
2. 2.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) for (d) let
3. 3.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) console.log() (d) let
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 4;
   console.log(x + y); (a) 5 (b) Error (c) 14
5. 5.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) for (d) console.log()
6. 6.⚡ What number does this code print?
   let apples = 12;
   apples = apples + 8;
   apples = apples - 3;
   console.log(apples);
7. 7.⚡ What number does this code print?
   let a = 24;
   let b = 12;
   console.log(a - b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 1;
   console.log(x + y); (a) 8 (b) 71 (c) Error
9. 9.⚡ What number does this code print?
   let a = 36;
   let b = 20;
   console.log(a - b);
10. 10.⚡ What number does this code print?
    let a = 34;
    let b = 18;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 19;
    apples = apples - 23;
    console.log(apples);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) Error (c) 63
13. 13.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 19;
    apples = apples - 5;
    console.log(apples);
14. 14.⚡ What number does this code print?
    let a = 11;
    let b = 5;
    console.log(a + b);
15. 15.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
16. 16.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 17;
    coins = coins - 9;
    console.log(coins);
17. 17.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
18. 18.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a * b);
20. 20.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) let
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) console.log()
22. 22.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
23. 23.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 6;
    apples = apples - 11;
    console.log(apples);
24. 24.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) name (c) Welcome, name! (d) Welcome, Riya!
26. 26.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 14;
    marks = marks - 17;
    console.log(marks);
27. 27.⚡ What number does this code print?
    let a = 20;
    let b = 40;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let a = 47;
    let b = 1;
    console.log(a - b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) Error (c) 15
30. 30.⚡ What number does this code print?
    let a = 20;
    let b = 10;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) Hi, Riya! (d) name
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Hi, name! (d) Aman
33. 33.⚡ What number does this code print?
    let a = 7;
    let b = 12;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 32;
    let b = 40;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 95 (b) 14 (c) Error
36. 36.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 6;
    apples = apples - 13;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
38. 38.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Meera (d) Well done, Meera!
39. 39.⚡ What number does this code print?
    let a = 19;
    let b = 30;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 39;
    let b = 15;
    console.log(a + b);

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