JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 477 · 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 = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) Well done, name! (d) name
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) if
3. 3.⚡ What number does this code print?
   let marks = 18;
   marks = marks + 6;
   marks = marks - 10;
   console.log(marks);
4. 4.⚡ What number does this code print?
   let apples = 9;
   apples = apples + 3;
   apples = apples - 1;
   console.log(apples);
5. 5.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
6. 6.⚡ What number does this code print?
   let a = 24;
   let b = 16;
   console.log(a - b);
7. 7.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) if
8. 8.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Arjun (d) Hi, Arjun!
9. 9.⚡ What number does this code print?
   let a = 36;
   let b = 14;
   console.log(a + b);
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, name! (d) Hello, Kabir!
11. 11.⚡ What number does this code print?
    let a = 4;
    let b = 9;
    console.log(a * b);
12. 12.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
13. 13.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 14;
    coins = coins - 23;
    console.log(coins);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 93 (b) 12 (c) Error
15. 15.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 5;
    coins = coins - 5;
    console.log(coins);
17. 17.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
18. 18.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Welcome, name! (d) Kabir
19. 19.⚡ Which JavaScript word makes a new variable? (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 = 4;
    console.log(x + y); (a) 84 (b) 12 (c) Error
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 13 (c) 58
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) Error (c) 28
23. 23.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) 9 (c) Error
25. 25.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 13 (c) 67
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
28. 28.⚡ What number does this code print?
    let a = 7;
    let b = 1;
    console.log(a - b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 15 (b) 78 (c) Error
30. 30.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
31. 31.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) Welcome, name! (d) name
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) Error (b) 10 (c) 64
33. 33.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, name! (d) Well done, Zoya!
34. 34.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 15;
    marks = marks - 7;
    console.log(marks);
35. 35.⚡ What number does this code print?
    let books = 5;
    books = books + 16;
    books = books - 7;
    console.log(books);
36. 36.⚡ What number does this code print?
    let a = 55;
    let b = 7;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 9;
    apples = apples - 9;
    console.log(apples);
38. 38.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
39. 39.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) alert() (d) console.log()
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 95 (b) Error (c) 14

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