JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 894 · 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 = "Aman";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman
2. 2.⚡ What number does this code print?
   let score = 8;
   score = score + 4;
   score = score - 1;
   console.log(score);
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
4. 4.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, name! (d) Hello, Aman!
5. 5.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) console.log()
6. 6.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) name (d) Welcome, Riya!
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) let (d) alert()
8. 8.⚡ What number does this code print?
   let score = 20;
   score = score + 8;
   score = score - 6;
   console.log(score);
9. 9.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Meera! (d) Meera
10. 10.⚡ What number does this code print?
    let a = 58;
    let b = 4;
    console.log(a - b);
11. 11.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
12. 12.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) name (c) Well done, Meera! (d) Well done, name!
13. 13.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
15. 15.⚡ What number does this code print?
    let a = 3;
    let b = 7;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
17. 17.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) alert()
18. 18.⚡ What number does this code print?
    let a = 55;
    let b = 29;
    console.log(a + b);
19. 19.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
20. 20.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
21. 21.⚡ What number does this code print?
    let books = 15;
    books = books + 12;
    books = books - 1;
    console.log(books);
22. 22.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
23. 23.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) alert()
24. 24.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) Riya (d) name
25. 25.⚡ What number does this code print?
    let a = 9;
    let b = 5;
    console.log(a * b);
26. 26.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) if (d) console.log()
27. 27.⚡ What number does this code print?
    let a = 16;
    let b = 28;
    console.log(a + b);
28. 28.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
29. 29.⚡ What number does this code print?
    let a = 31;
    let b = 26;
    console.log(a - b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) Error (b) 14 (c) 59
31. 31.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 9;
    coins = coins - 19;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 16;
    marks = marks - 36;
    console.log(marks);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 11 (b) 65 (c) Error
34. 34.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 8;
    marks = marks - 8;
    console.log(marks);
35. 35.⚡ What number does this code print?
    let score = 11;
    score = score + 4;
    score = score - 8;
    console.log(score);
36. 36.⚡ 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
37. 37.⚡ What number does this code print?
    let score = 29;
    score = score + 2;
    score = score - 21;
    console.log(score);
38. 38.⚡ What number does this code print?
    let a = 27;
    let b = 18;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) 55 (c) Error

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