JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 694 · 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 alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) let (d) alert()
3. 3.⚡ 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
4. 4.⚡ What number does this code print?
   let a = 40;
   let b = 10;
   console.log(a + b);
5. 5.⚡ What number does this code print?
   let a = 9;
   let b = 5;
   console.log(a * b);
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
7. 7.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
8. 8.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) for (d) console.log()
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 7;
   console.log(x + y); (a) 47 (b) 11 (c) Error
10. 10.⚡ What number does this code print?
    let a = 37;
    let b = 20;
    console.log(a - b);
11. 11.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
13. 13.⚡ What number does this code print?
    let a = 10;
    let b = 12;
    console.log(a + b);
14. 14.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
15. 15.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let a = 43;
    let b = 6;
    console.log(a + b);
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, name! (d) Hi, Riya!
18. 18.⚡ What number does this code print?
    let a = 6;
    let b = 5;
    console.log(a + b);
19. 19.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) let (d) if
20. 20.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) Meera (d) name
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 5 (c) 23
22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, name! (d) Well done, Arjun!
23. 23.⚡ What number does this code print?
    let a = 33;
    let b = 6;
    console.log(a - b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) Error (b) 11 (c) 38
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) Error (c) 17
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
27. 27.⚡ What number does this code print?
    let a = 33;
    let b = 11;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let score = 14;
    score = score + 5;
    score = score - 4;
    console.log(score);
29. 29.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 9;
    runs = runs - 1;
    console.log(runs);
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
31. 31.⚡ What number does this code print?
    let books = 30;
    books = books + 3;
    books = books - 20;
    console.log(books);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) 53 (c) Error
33. 33.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) name (c) Hello, name! (d) Hello, Kabir!
34. 34.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) console.log() (d) for
35. 35.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 7;
    runs = runs - 8;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 10;
    runs = runs - 26;
    console.log(runs);
37. 37.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 9;
    coins = coins - 3;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let a = 12;
    let b = 7;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) Error (c) 8
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name

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