JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 920 · 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 print? (Look at the quotes!)
   let x = "8";
   let y = 4;
   console.log(x + y); (a) 84 (b) Error (c) 12
2. 2.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) alert()
3. 3.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) name (d) Well done, name!
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) Error (b) 10 (c) 82
5. 5.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) for (d) if
6. 6.⚡ What number does this code print?
   let a = 7;
   let b = 4;
   console.log(a - b);
7. 7.⚡ What number does this code print?
   let a = 54;
   let b = 5;
   console.log(a + b);
8. 8.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
9. 9.⚡ What number does this code print?
   let books = 14;
   books = books + 17;
   books = books - 18;
   console.log(books);
10. 10.⚡ What number does this code print?
    let a = 3;
    let b = 9;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let score = 19;
    score = score + 4;
    score = score - 18;
    console.log(score);
12. 12.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
13. 13.⚡ What number does this code print?
    let a = 21;
    let b = 38;
    console.log(a + b);
14. 14.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
15. 15.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
16. 16.⚡ What number does this code print?
    let a = 59;
    let b = 17;
    console.log(a + b);
17. 17.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) alert()
18. 18.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) name (d) Hi, Zoya!
19. 19.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) Well done, Kabir! (d) name
20. 20.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, Riya! (d) Well done, name!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) Error (c) 87
22. 22.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 9;
    marks = marks - 22;
    console.log(marks);
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) for (d) alert()
24. 24.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) Riya (d) name
25. 25.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Arjun! (d) Arjun
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
27. 27.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
28. 28.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 20;
    coins = coins - 12;
    console.log(coins);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) 5 (c) Error
30. 30.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) for
31. 31.⚡ What number does this code print?
    let a = 33;
    let b = 30;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let a = 30;
    let b = 5;
    console.log(a - b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) Error (c) 23
34. 34.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 20;
    runs = runs - 5;
    console.log(runs);
35. 35.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 4;
    coins = coins - 8;
    console.log(coins);
36. 36.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 8;
    marks = marks - 13;
    console.log(marks);
37. 37.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 5;
    runs = runs - 20;
    console.log(runs);
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
39. 39.⚡ What number does this code print?
    let books = 30;
    books = books + 17;
    books = books - 12;
    console.log(books);
40. 40.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 14;
    apples = apples - 38;
    console.log(apples);

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