JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 236 · 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 = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Kabir (d) Hi, name!
2. 2.⚡ What number does this code print?
   let coins = 6;
   coins = coins + 20;
   coins = coins - 15;
   console.log(coins);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 7;
   console.log(x + y); (a) 27 (b) 9 (c) Error
4. 4.⚡ What number does this code print?
   let a = 48;
   let b = 15;
   console.log(a + b);
5. 5.⚡ 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
6. 6.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
7. 7.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) for (d) alert()
8. 8.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
9. 9.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) console.log()
11. 11.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) Hi, name! (d) name
12. 12.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 8;
    runs = runs - 10;
    console.log(runs);
13. 13.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) 77 (c) Error
16. 16.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
17. 17.⚡ 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
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
19. 19.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a + b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 94 (c) 13
21. 21.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) alert() (d) console.log()
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) 48 (c) Error
23. 23.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
24. 24.⚡ What number does this code print?
    let a = 16;
    let b = 36;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 5;
    coins = coins - 9;
    console.log(coins);
26. 26.⚡ What number does this code print?
    let a = 49;
    let b = 2;
    console.log(a + b);
27. 27.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) alert() (d) let
28. 28.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 15;
    marks = marks - 26;
    console.log(marks);
29. 29.⚡ What number does this code print?
    let a = 13;
    let b = 14;
    console.log(a + b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) Error (c) 53
31. 31.⚡ What number does this code print?
    let books = 30;
    books = books + 12;
    books = books - 36;
    console.log(books);
32. 32.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Zoya! (d) Zoya
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let score = 19;
    score = score + 8;
    score = score - 20;
    console.log(score);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) Error (c) 66
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) 4 (c) Error
39. 39.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
40. 40.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);

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