JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 96 · 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.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
2. 2.⚡ What number does this code print?
   let score = 12;
   score = score + 20;
   score = score - 18;
   console.log(score);
3. 3.⚡ What number does this code print?
   let a = 53;
   let b = 29;
   console.log(a - b);
4. 4.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
5. 5.⚡ What does this code show?
   let name = "Kabir";
   alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Kabir (d) Well done, name!
6. 6.⚡ What number does this code print?
   let a = 4;
   let b = 6;
   console.log(a * b);
7. 7.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) alert() (d) let
8. 8.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
9. 9.⚡ What number does this code print?
   let a = 42;
   let b = 31;
   console.log(a - b);
10. 10.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) name (d) Arjun
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
13. 13.⚡ What number does this code print?
    let a = 25;
    let b = 18;
    console.log(a + b);
14. 14.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) Welcome, Arjun! (d) name
15. 15.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) if
16. 16.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
17. 17.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) Hi, name! (d) name
18. 18.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) console.log()
19. 19.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 14;
    apples = apples - 9;
    console.log(apples);
20. 20.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 12 (b) Error (c) 57
22. 22.⚡ What number does this code print?
    let a = 55;
    let b = 28;
    console.log(a - b);
23. 23.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) Well done, name! (c) Well done, Zoya! (d) name
24. 24.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 2;
    runs = runs - 10;
    console.log(runs);
25. 25.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) alert() (d) let
26. 26.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
28. 28.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) console.log()
29. 29.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
30. 30.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) name (d) Welcome, name!
31. 31.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 14;
    runs = runs - 39;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 2;
    marks = marks - 1;
    console.log(marks);
33. 33.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 2;
    runs = runs - 1;
    console.log(runs);
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) Welcome, name! (d) name
35. 35.⚡ What number does this code print?
    let score = 9;
    score = score + 2;
    score = score - 8;
    console.log(score);
36. 36.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
37. 37.⚡ 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
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) Error (c) 85
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
40. 40.⚡ What number does this code print?
    let books = 26;
    books = books + 10;
    books = books - 4;
    console.log(books);

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