JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 886 · 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("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Hi, name! (d) Riya
2. 2.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) Hi, name! (d) name
3. 3.⚡ What number does this code print?
   let a = 40;
   let b = 17;
   console.log(a - b);
4. 4.⚡ Which JavaScript word repeats code? (a) for (b) let (c) alert() (d) if
5. 5.⚡ What number does this code print?
   let books = 25;
   books = books + 14;
   books = books - 5;
   console.log(books);
6. 6.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
7. 7.⚡ What does this code show?
   let name = "Arjun";
   console.log("Welcome, " + name + "!"); (a) name (b) Arjun (c) Welcome, name! (d) Welcome, Arjun!
8. 8.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
9. 9.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) alert()
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
11. 11.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) if (d) let
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) Error (c) 10
13. 13.⚡ What number does this code print?
    let a = 46;
    let b = 20;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let score = 16;
    score = score + 15;
    score = score - 12;
    console.log(score);
15. 15.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
16. 16.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
17. 17.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
18. 18.⚡ What number does this code print?
    let score = 23;
    score = score + 19;
    score = score - 28;
    console.log(score);
19. 19.⚡ What number does this code print?
    let a = 34;
    let b = 17;
    console.log(a - b);
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) if (d) alert()
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
22. 22.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 25;
    let b = 21;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) Error (b) 13 (c) 49
25. 25.⚡ What number does this code print?
    let a = 35;
    let b = 7;
    console.log(a - b);
26. 26.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) let (d) alert()
27. 27.⚡ What number does this code print?
    let books = 8;
    books = books + 20;
    books = books - 21;
    console.log(books);
28. 28.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 19;
    marks = marks - 6;
    console.log(marks);
29. 29.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 14;
    apples = apples - 21;
    console.log(apples);
30. 30.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) Error (b) 66 (c) 12
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 23 (c) 5
33. 33.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
34. 34.⚡ What number does this code print?
    let a = 54;
    let b = 31;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) Error (c) 33
36. 36.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 5;
    coins = coins - 8;
    console.log(coins);
37. 37.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
38. 38.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 20;
    apples = apples - 9;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let a = 12;
    let b = 29;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) name (d) Hello, Meera!

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