JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 958 · 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";
   alert("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, name! (d) Hi, Kabir!
2. 2.⚡ What does this code show?
   let name = "Arjun";
   console.log("Welcome, " + name + "!"); (a) Arjun (b) Welcome, Arjun! (c) Welcome, name! (d) name
3. 3.⚡ What number does this code print?
   let apples = 7;
   apples = apples + 20;
   apples = apples - 4;
   console.log(apples);
4. 4.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) if (d) for
5. 5.⚡ What number does this code print?
   let a = 45;
   let b = 31;
   console.log(a + b);
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
7. 7.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
8. 8.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) Hello, Zoya! (d) name
9. 9.⚡ What number does this code print?
   let a = 13;
   let b = 7;
   console.log(a - b);
10. 10.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) console.log() (d) let
11. 11.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
12. 12.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
13. 13.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) Well done, name! (c) name (d) Arjun
14. 14.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
15. 15.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 10;
    apples = apples - 18;
    console.log(apples);
16. 16.⚡ What number does this code print?
    let a = 18;
    let b = 31;
    console.log(a + b);
17. 17.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) name (d) Welcome, Arjun!
18. 18.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
19. 19.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a - b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 44 (b) 8 (c) Error
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 15 (c) 96
22. 22.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) let
23. 23.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 18;
    coins = coins - 15;
    console.log(coins);
24. 24.⚡ What number does this code print?
    let a = 21;
    let b = 8;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) name (d) Hello, name!
26. 26.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
27. 27.⚡ What number does this code print?
    let a = 30;
    let b = 4;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let a = 6;
    let b = 11;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Welcome, name! (d) Meera
30. 30.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) if
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) 64 (c) Error
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) Error (c) 9
33. 33.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 2;
    runs = runs - 3;
    console.log(runs);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 36 (c) 9
36. 36.⚡ What number does this code print?
    let a = 19;
    let b = 9;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) Error (c) 3
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 39 (b) 12 (c) Error
39. 39.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) Kabir (d) name
40. 40.⚡ What number does this code print?
    let books = 14;
    books = books + 5;
    books = books - 17;
    console.log(books);

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