JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 912 · 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 a = 15;
   let b = 1;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let a = 6;
   let b = 12;
   console.log(a * b);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 6;
   console.log(x + y); (a) Error (b) 10 (c) 46
4. 4.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) let (d) if
5. 5.⚡ What number does this code print?
   let a = 5;
   let b = 9;
   console.log(a * b);
6. 6.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, name! (d) Welcome, Meera!
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) if
8. 8.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
9. 9.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) Welcome, Kabir! (d) name
10. 10.⚡ What number does this code print?
    let a = 59;
    let b = 6;
    console.log(a - b);
11. 11.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) let
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) Error (c) 24
13. 13.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a * b);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 8 (b) 26 (c) Error
15. 15.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) Error (c) 5
17. 17.⚡ What number does this code print?
    let score = 9;
    score = score + 12;
    score = score - 8;
    console.log(score);
18. 18.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 11;
    marks = marks - 5;
    console.log(marks);
19. 19.⚡ What number does this code print?
    let a = 9;
    let b = 15;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 9;
    apples = apples - 2;
    console.log(apples);
21. 21.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) let (d) alert()
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
23. 23.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 19;
    apples = apples - 22;
    console.log(apples);
24. 24.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a * b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
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 = 33;
    let b = 35;
    console.log(a + b);
28. 28.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) for
29. 29.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) name (d) Welcome, name!
30. 30.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 7;
    runs = runs - 6;
    console.log(runs);
31. 31.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
32. 32.⚡ What number does this code print?
    let a = 48;
    let b = 34;
    console.log(a + b);
33. 33.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, Aman! (d) Hello, name!
34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Arjun (c) Welcome, Arjun! (d) Welcome, name!
35. 35.⚡ What number does this code print?
    let a = 37;
    let b = 15;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 13;
    let b = 40;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) name (c) Zoya (d) Hi, name!
39. 39.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Kabir! (d) Kabir
40. 40.⚡ What number does this code print?
    let books = 16;
    books = books + 6;
    books = books - 13;
    console.log(books);

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