JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 541 · 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 = "Riya";
   console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
2. 2.⚡ What number does this code print?
   let a = 15;
   let b = 6;
   console.log(a - b);
3. 3.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Kabir (d) Well done, Kabir!
4. 4.⚡ What number does this code print?
   let coins = 12;
   coins = coins + 5;
   coins = coins - 16;
   console.log(coins);
5. 5.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) for
6. 6.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
7. 7.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
8. 8.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Arjun (d) Hello, Arjun!
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) let (d) console.log()
10. 10.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
11. 11.⚡ What number does this code print?
    let books = 16;
    books = books + 5;
    books = books - 16;
    console.log(books);
12. 12.⚡ What number does this code print?
    let a = 55;
    let b = 9;
    console.log(a + b);
13. 13.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
14. 14.⚡ What number does this code print?
    let a = 35;
    let b = 12;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let a = 35;
    let b = 25;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let a = 14;
    let b = 10;
    console.log(a - b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) Error (c) 81
18. 18.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 28;
    let b = 19;
    console.log(a + b);
20. 20.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
21. 21.⚡ What number does this code print?
    let books = 14;
    books = books + 7;
    books = books - 19;
    console.log(books);
22. 22.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
23. 23.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) name (d) Riya
24. 24.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) for
25. 25.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) if (d) alert()
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) 56 (c) Error
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
28. 28.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 41;
    let b = 8;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 9;
    runs = runs - 5;
    console.log(runs);
31. 31.⚡ What number does this code print?
    let a = 14;
    let b = 14;
    console.log(a + b);
32. 32.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) Arjun (c) Hi, name! (d) name
33. 33.⚡ What number does this code print?
    let books = 22;
    books = books + 6;
    books = books - 14;
    console.log(books);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) Error (c) 28
35. 35.⚡ What number does this code print?
    let a = 39;
    let b = 9;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 15 (b) Error (c) 78
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 10 (c) 55
39. 39.⚡ 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
40. 40.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) console.log() (d) if

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