JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 660 · 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 number does this code print?
   let score = 13;
   score = score + 13;
   score = score - 25;
   console.log(score);
2. 2.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) alert() (d) for
3. 3.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
4. 4.⚡ What number does this code print?
   let a = 6;
   let b = 8;
   console.log(a * b);
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) let
6. 6.⚡ Which JavaScript word repeats code? (a) let (b) for (c) if (d) alert()
7. 7.⚡ What number does this code print?
   let a = 22;
   let b = 31;
   console.log(a + b);
8. 8.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
9. 9.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
11. 11.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) console.log()
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 65 (b) Error (c) 11
13. 13.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
14. 14.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Meera! (d) Meera
15. 15.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 16;
    coins = coins - 9;
    console.log(coins);
16. 16.⚡ What number does this code print?
    let a = 38;
    let b = 10;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 19;
    apples = apples - 14;
    console.log(apples);
18. 18.⚡ What number does this code print?
    let a = 33;
    let b = 31;
    console.log(a - b);
19. 19.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Arjun (d) Welcome, Arjun!
20. 20.⚡ What number does this code print?
    let a = 30;
    let b = 16;
    console.log(a + b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) Error (b) 34 (c) 7
22. 22.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, name! (d) Welcome, Aman!
24. 24.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Riya (d) Hello, name!
25. 25.⚡ What number does this code print?
    let books = 10;
    books = books + 5;
    books = books - 1;
    console.log(books);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 11 (c) 56
27. 27.⚡ What number does this code print?
    let a = 42;
    let b = 19;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) Welcome, Aman! (d) name
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
30. 30.⚡ What number does this code print?
    let a = 3;
    let b = 5;
    console.log(a * b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) Error (b) 13 (c) 76
33. 33.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) name (d) Kabir
34. 34.⚡ What number does this code print?
    let a = 44;
    let b = 33;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 54;
    let b = 9;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 6;
    let b = 17;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 2;
    runs = runs - 12;
    console.log(runs);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 58 (b) Error (c) 13
39. 39.⚡ What number does this code print?
    let books = 7;
    books = books + 17;
    books = books - 18;
    console.log(books);
40. 40.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);

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