JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 273 · 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 number does this code print?
   let books = 17;
   books = books + 3;
   books = books - 3;
   console.log(books);
2. 2.⚡ What number does this code print?
   let runs = 30;
   runs = runs + 2;
   runs = runs - 20;
   console.log(runs);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 2;
   console.log(x + y); (a) 4 (b) Error (c) 22
4. 4.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Riya! (d) Riya
5. 5.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
6. 6.⚡ What number does this code print?
   let a = 11;
   let b = 3;
   console.log(a * b);
7. 7.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, Kabir! (d) Hi, name!
8. 8.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) name (d) Hi, Zoya!
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 1;
   console.log(x + y); (a) 61 (b) 7 (c) Error
10. 10.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) name (d) Zoya
11. 11.⚡ What number does this code print?
    let a = 44;
    let b = 15;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let books = 9;
    books = books + 9;
    books = books - 2;
    console.log(books);
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
14. 14.⚡ What number does this code print?
    let a = 49;
    let b = 19;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 16;
    apples = apples - 13;
    console.log(apples);
16. 16.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a * b);
17. 17.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, name! (d) Well done, Arjun!
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, name! (d) Hi, Aman!
19. 19.⚡ What number does this code print?
    let a = 30;
    let b = 34;
    console.log(a + b);
20. 20.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
21. 21.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) console.log()
22. 22.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) if (d) console.log()
24. 24.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 4;
    apples = apples - 3;
    console.log(apples);
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Welcome, name! (d) Riya
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 75 (b) 12 (c) Error
27. 27.⚡ Which JavaScript word repeats code? (a) let (b) if (c) console.log() (d) for
28. 28.⚡ What number does this code print?
    let a = 59;
    let b = 30;
    console.log(a + b);
29. 29.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) alert() (d) console.log()
30. 30.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
31. 31.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) Error (c) 13
33. 33.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 15;
    coins = coins - 23;
    console.log(coins);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Arjun (c) Welcome, name! (d) name
35. 35.⚡ What number does this code print?
    let a = 16;
    let b = 36;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let books = 9;
    books = books + 14;
    books = books - 9;
    console.log(books);
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) Riya (d) name
38. 38.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 9;
    coins = coins - 14;
    console.log(coins);
39. 39.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 9;
    marks = marks - 26;
    console.log(marks);
40. 40.⚡ What number does this code print?
    let books = 17;
    books = books + 12;
    books = books - 2;
    console.log(books);

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