JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 549 · 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 = "9";
   let y = 2;
   console.log(x + y); (a) 92 (b) 11 (c) Error
2. 2.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) let (d) alert()
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 5;
   console.log(x + y); (a) Error (b) 25 (c) 7
4. 4.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 6;
   console.log(x + y); (a) 10 (b) 46 (c) Error
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) 21 (b) 3 (c) Error
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 6;
   console.log(x + y); (a) 66 (b) Error (c) 12
8. 8.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) if
10. 10.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
11. 11.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 27 (b) Error (c) 9
13. 13.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 10;
    coins = coins - 3;
    console.log(coins);
14. 14.⚡ What number does this code print?
    let score = 8;
    score = score + 15;
    score = score - 16;
    console.log(score);
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Arjun (d) Well done, name!
16. 16.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Meera (c) Well done, name! (d) Well done, Meera!
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) 58 (c) Error
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 86 (b) Error (c) 14
19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, name! (d) Well done, Zoya!
20. 20.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, Kabir! (c) Welcome, name! (d) name
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) Error (c) 34
22. 22.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) if
23. 23.⚡ What number does this code print?
    let score = 18;
    score = score + 11;
    score = score - 13;
    console.log(score);
24. 24.⚡ What number does this code print?
    let a = 50;
    let b = 33;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let a = 58;
    let b = 3;
    console.log(a - b);
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
27. 27.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) for
28. 28.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
29. 29.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) name (c) Welcome, name! (d) Aman
30. 30.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) name (d) Hi, Kabir!
31. 31.⚡ What number does this code print?
    let books = 24;
    books = books + 16;
    books = books - 33;
    console.log(books);
32. 32.⚡ What number does this code print?
    let a = 53;
    let b = 9;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 7;
    marks = marks - 21;
    console.log(marks);
34. 34.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 20;
    coins = coins - 10;
    console.log(coins);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Zoya! (c) Well done, name! (d) Zoya
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) Error (c) 62
37. 37.⚡ What number does this code print?
    let a = 59;
    let b = 39;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let books = 5;
    books = books + 4;
    books = books - 8;
    console.log(books);
39. 39.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 8;
    runs = runs - 1;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 5;
    runs = runs - 6;
    console.log(runs);

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