JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 656 · 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 writes in the console? (a) let (b) console.log() (c) for (d) alert()
2. 2.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) alert() (d) let
3. 3.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 6;
   console.log(x + y); (a) 36 (b) 9 (c) Error
5. 5.⚡ What number does this code print?
   let a = 4;
   let b = 12;
   console.log(a * b);
6. 6.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!
8. 8.⚡ What number does this code print?
   let books = 8;
   books = books + 3;
   books = books - 1;
   console.log(books);
9. 9.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
10. 10.⚡ Which JavaScript word repeats code? (a) for (b) if (c) alert() (d) console.log()
11. 11.⚡ What number does this code print?
    let score = 9;
    score = score + 8;
    score = score - 6;
    console.log(score);
12. 12.⚡ What number does this code print?
    let a = 15;
    let b = 11;
    console.log(a + b);
13. 13.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 8;
    marks = marks - 8;
    console.log(marks);
14. 14.⚡ What number does this code print?
    let score = 20;
    score = score + 12;
    score = score - 28;
    console.log(score);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) Error (b) 9 (c) 45
16. 16.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Arjun (c) name (d) Welcome, name!
17. 17.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Aman (d) Hello, name!
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) 17 (c) Error
19. 19.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) alert() (d) console.log()
20. 20.⚡ What number does this code print?
    let a = 7;
    let b = 14;
    console.log(a + b);
21. 21.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
22. 22.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 10;
    marks = marks - 18;
    console.log(marks);
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) if (d) alert()
24. 24.⚡ What number does this code print?
    let a = 54;
    let b = 16;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let a = 18;
    let b = 6;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) Error (c) 47
27. 27.⚡ What number does this code print?
    let a = 18;
    let b = 1;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let a = 53;
    let b = 7;
    console.log(a + b);
29. 29.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) name (d) Riya
30. 30.⚡ 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
31. 31.⚡ What number does this code print?
    let a = 14;
    let b = 21;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 12;
    apples = apples - 5;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let score = 21;
    score = score + 6;
    score = score - 23;
    console.log(score);
34. 34.⚡ What number does this code print?
    let a = 27;
    let b = 24;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) Error (c) 11
36. 36.⚡ What number does this code print?
    let a = 18;
    let b = 14;
    console.log(a - b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 16 (c) 79
38. 38.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Zoya (c) Hello, name! (d) name
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Riya (d) Hello, name!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 9 (c) 18

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