JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 67 · 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 alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
2. 2.⚡ What number does this code print?
   let a = 19;
   let b = 19;
   console.log(a + b);
3. 3.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) console.log() (d) let
4. 4.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
5. 5.⚡ What number does this code print?
   let a = 60;
   let b = 24;
   console.log(a + b);
6. 6.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
7. 7.⚡ What number does this code print?
   let apples = 29;
   apples = apples + 20;
   apples = apples - 26;
   console.log(apples);
8. 8.⚡ What number does this code print?
   let a = 49;
   let b = 1;
   console.log(a - b);
9. 9.⚡ What number does this code print?
   let coins = 10;
   coins = coins + 10;
   coins = coins - 12;
   console.log(coins);
10. 10.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 14;
    marks = marks - 17;
    console.log(marks);
12. 12.⚡ What number does this code print?
    let score = 8;
    score = score + 6;
    score = score - 12;
    console.log(score);
13. 13.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) Hello, name! (d) name
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) Error (c) 29
15. 15.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 4;
    runs = runs - 2;
    console.log(runs);
16. 16.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 8;
    apples = apples - 14;
    console.log(apples);
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) name (d) Hello, name!
18. 18.⚡ What number does this code print?
    let a = 43;
    let b = 9;
    console.log(a - b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) 36 (c) Error
20. 20.⚡ What number does this code print?
    let a = 3;
    let b = 10;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 43;
    let b = 27;
    console.log(a + b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 11 (b) Error (c) 92
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
24. 24.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 12;
    apples = apples - 5;
    console.log(apples);
25. 25.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) alert()
26. 26.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) let
27. 27.⚡ What number does this code print?
    let a = 4;
    let b = 3;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let a = 11;
    let b = 33;
    console.log(a + b);
29. 29.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
30. 30.⚡ What number does this code print?
    let a = 33;
    let b = 9;
    console.log(a - b);
31. 31.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) if (d) alert()
32. 32.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) for (d) alert()
33. 33.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
34. 34.⚡ What number does this code print?
    let a = 52;
    let b = 39;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 8;
    let b = 21;
    console.log(a + b);
36. 36.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) Hello, Zoya! (d) name
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
38. 38.⚡ What number does this code print?
    let score = 27;
    score = score + 19;
    score = score - 46;
    console.log(score);
39. 39.⚡ What number does this code print?
    let a = 32;
    let b = 6;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let books = 24;
    books = books + 10;
    books = books - 9;
    console.log(books);

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