JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 346 · 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 a = 15;
   let b = 9;
   console.log(a + b);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 1;
   console.log(x + y); (a) 91 (b) 10 (c) Error
3. 3.⚡ What number does this code print?
   let a = 2;
   let b = 8;
   console.log(a * b);
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) let
5. 5.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
6. 6.⚡ What number does this code print?
   let a = 7;
   let b = 7;
   console.log(a * b);
7. 7.⚡ What number does this code print?
   let apples = 23;
   apples = apples + 20;
   apples = apples - 14;
   console.log(apples);
8. 8.⚡ What number does this code print?
   let a = 44;
   let b = 18;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let score = 16;
   score = score + 18;
   score = score - 31;
   console.log(score);
10. 10.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 19;
    coins = coins - 34;
    console.log(coins);
11. 11.⚡ What number does this code print?
    let books = 22;
    books = books + 8;
    books = books - 3;
    console.log(books);
12. 12.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) if (d) for
13. 13.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 14 (c) 5
15. 15.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 5;
    coins = coins - 23;
    console.log(coins);
16. 16.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) console.log() (d) alert()
17. 17.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
18. 18.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) name (d) Hi, name!
20. 20.⚡ What number does this code print?
    let books = 11;
    books = books + 8;
    books = books - 2;
    console.log(books);
21. 21.⚡ What number does this code print?
    let a = 9;
    let b = 4;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 25;
    let b = 4;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 17;
    coins = coins - 11;
    console.log(coins);
25. 25.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 5;
    apples = apples - 4;
    console.log(apples);
26. 26.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
28. 28.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 16;
    let b = 1;
    console.log(a - b);
31. 31.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Kabir! (d) Kabir
32. 32.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 9;
    runs = runs - 12;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 7;
    marks = marks - 5;
    console.log(marks);
34. 34.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) alert()
35. 35.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 6;
    marks = marks - 12;
    console.log(marks);
36. 36.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Arjun (c) Hello, Arjun! (d) Hello, name!
37. 37.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 4;
    marks = marks - 14;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 3;
    coins = coins - 8;
    console.log(coins);
39. 39.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) if
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) name (d) Welcome, name!

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