JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 75 · 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.⚡ 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
2. 2.⚡ Which JavaScript word repeats code? (a) for (b) let (c) console.log() (d) alert()
3. 3.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) if (d) console.log()
4. 4.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, name! (d) Hello, Riya!
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 5;
   console.log(x + y); (a) 15 (b) Error (c) 6
7. 7.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) for (d) alert()
9. 9.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) Hello, name! (d) name
10. 10.⚡ What number does this code print?
    let a = 43;
    let b = 25;
    console.log(a - b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 47 (b) 11 (c) Error
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 11 (c) 56
13. 13.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
14. 14.⚡ What number does this code print?
    let a = 59;
    let b = 27;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let score = 12;
    score = score + 2;
    score = score - 6;
    console.log(score);
17. 17.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
18. 18.⚡ What number does this code print?
    let a = 5;
    let b = 28;
    console.log(a + b);
19. 19.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, Meera! (d) Welcome, name!
21. 21.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) Hello, Kabir! (d) name
22. 22.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 6;
    marks = marks - 1;
    console.log(marks);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) Error (b) 8 (c) 35
24. 24.⚡ What number does this code print?
    let books = 27;
    books = books + 20;
    books = books - 16;
    console.log(books);
25. 25.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Meera! (d) Meera
26. 26.⚡ 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
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 95 (c) 14
28. 28.⚡ What number does this code print?
    let a = 35;
    let b = 3;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 51 (b) Error (c) 6
30. 30.⚡ What number does this code print?
    let a = 58;
    let b = 2;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 9;
    apples = apples - 18;
    console.log(apples);
32. 32.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Arjun (d) Welcome, Arjun!
33. 33.⚡ What number does this code print?
    let a = 58;
    let b = 5;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 53 (c) 8
36. 36.⚡ What number does this code print?
    let a = 19;
    let b = 10;
    console.log(a + b);
37. 37.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) console.log() (d) if
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 8 (c) 71
39. 39.⚡ What number does this code print?
    let a = 4;
    let b = 4;
    console.log(a * b);
40. 40.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js

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