JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 696 · 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 JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
2. 2.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) console.log()
3. 3.⚡ What number does this code print?
   let runs = 22;
   runs = runs + 7;
   runs = runs - 8;
   console.log(runs);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 7;
   console.log(x + y); (a) 87 (b) Error (c) 15
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) let (d) alert()
6. 6.⚡ What number does this code print?
   let a = 11;
   let b = 5;
   console.log(a * b);
7. 7.⚡ Which JavaScript word repeats code? (a) for (b) if (c) console.log() (d) alert()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 5;
   console.log(x + y); (a) 9 (b) Error (c) 45
9. 9.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
10. 10.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
11. 11.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Arjun! (d) Arjun
12. 12.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) alert()
13. 13.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) for (d) console.log()
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) 18 (c) Error
15. 15.⚡ What number does this code print?
    let a = 10;
    let b = 10;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let a = 40;
    let b = 33;
    console.log(a + b);
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, Riya! (d) Well done, name!
18. 18.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
19. 19.⚡ What number does this code print?
    let books = 24;
    books = books + 4;
    books = books - 26;
    console.log(books);
20. 20.⚡ What number does this code print?
    let books = 22;
    books = books + 6;
    books = books - 21;
    console.log(books);
21. 21.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, name! (d) Hi, Aman!
23. 23.⚡ What number does this code print?
    let a = 29;
    let b = 11;
    console.log(a - b);
24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) Arjun (d) name
25. 25.⚡ What number does this code print?
    let books = 30;
    books = books + 2;
    books = books - 28;
    console.log(books);
26. 26.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 93 (b) 12 (c) Error
28. 28.⚡ What number does this code print?
    let a = 60;
    let b = 20;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 5;
    runs = runs - 9;
    console.log(runs);
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
31. 31.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 20;
    coins = coins - 8;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let a = 39;
    let b = 4;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 32;
    let b = 12;
    console.log(a - b);
34. 34.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) Meera (c) Hi, name! (d) name
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) Error (b) 68 (c) 14
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 43 (c) 7
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) Error (c) 64
38. 38.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a new tab (d) a picture
39. 39.⚡ What number does this code print?
    let a = 8;
    let b = 7;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let score = 20;
    score = score + 3;
    score = score - 22;
    console.log(score);

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