JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 722 · 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 number does this code print?
   let books = 6;
   books = books + 5;
   books = books - 9;
   console.log(books);
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
3. 3.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) console.log() (d) if
4. 4.⚡ What number does this code print?
   let score = 26;
   score = score + 15;
   score = score - 32;
   console.log(score);
5. 5.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) for
6. 6.⚡ What number does this code print?
   let marks = 6;
   marks = marks + 16;
   marks = marks - 21;
   console.log(marks);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 4;
   console.log(x + y); (a) Error (b) 9 (c) 54
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) let (d) alert()
9. 9.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
10. 10.⚡ What number does this code print?
    let a = 56;
    let b = 3;
    console.log(a + b);
11. 11.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
12. 12.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, name! (d) Hi, Meera!
13. 13.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
14. 14.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) let (d) if
15. 15.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 3;
    marks = marks - 2;
    console.log(marks);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
17. 17.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 4 (b) 22 (c) Error
19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Zoya! (d) Zoya
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 69 (b) 15 (c) Error
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) Error (c) 46
22. 22.⚡ What number does this code print?
    let a = 27;
    let b = 25;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 53;
    let b = 26;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) 9 (c) Error
25. 25.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, name! (d) Hello, Kabir!
26. 26.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 9;
    apples = apples - 13;
    console.log(apples);
27. 27.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Hi, name! (d) Aman
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) Aman (d) name
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) Error (c) 10
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 9 (c) 81
32. 32.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) name (d) Well done, Zoya!
34. 34.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Welcome, name! (d) Meera
35. 35.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) name (d) Welcome, Arjun!
36. 36.⚡ What number does this code print?
    let score = 28;
    score = score + 3;
    score = score - 3;
    console.log(score);
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Hello, name! (d) Riya
38. 38.⚡ What number does this code print?
    let a = 9;
    let b = 10;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Aman (d) Welcome, name!
40. 40.⚡ What number does this code print?
    let a = 6;
    let b = 11;
    console.log(a * b);

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