JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 870 · 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 = "3";
   let y = 6;
   console.log(x + y); (a) 9 (b) Error (c) 36
2. 2.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, name! (d) Well done, Arjun!
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 9;
   console.log(x + y); (a) 59 (b) Error (c) 14
4. 4.⚡ What number does this code print?
   let a = 33;
   let b = 15;
   console.log(a + b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 5;
   console.log(x + y); (a) 7 (b) 25 (c) Error
6. 6.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) if
7. 7.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) Hi, Aman! (d) name
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) console.log() (d) alert()
9. 9.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
11. 11.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) if (d) let
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 13 (c) 4
13. 13.⚡ 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
14. 14.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) Error (b) 88 (c) 16
16. 16.⚡ What number does this code print?
    let a = 34;
    let b = 10;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let score = 30;
    score = score + 2;
    score = score - 20;
    console.log(score);
18. 18.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 15;
    apples = apples - 11;
    console.log(apples);
19. 19.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Meera (d) Welcome, Meera!
20. 20.⚡ 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
21. 21.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) let
22. 22.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Meera! (d) Meera
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 89 (c) 17
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) Error (c) 63
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) name (d) Welcome, name!
26. 26.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let a = 18;
    let b = 21;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let books = 12;
    books = books + 15;
    books = books - 4;
    console.log(books);
29. 29.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 5;
    coins = coins - 17;
    console.log(coins);
30. 30.⚡ What number does this code print?
    let a = 42;
    let b = 18;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let a = 57;
    let b = 35;
    console.log(a + b);
32. 32.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
33. 33.⚡ What number does this code print?
    let a = 18;
    let b = 16;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Meera! (c) name (d) Meera
35. 35.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) let (d) console.log()
36. 36.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a * b);
37. 37.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
38. 38.⚡ What number does this code print?
    let score = 5;
    score = score + 11;
    score = score - 2;
    console.log(score);
39. 39.⚡ What number does this code print?
    let a = 36;
    let b = 26;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a - b);

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