JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 428 · 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.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
2. 2.⚡ What number does this code print?
   let runs = 10;
   runs = runs + 10;
   runs = runs - 13;
   console.log(runs);
3. 3.⚡ What number does this code print?
   let apples = 26;
   apples = apples + 18;
   apples = apples - 33;
   console.log(apples);
4. 4.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
5. 5.⚡ What number does this code print?
   let coins = 29;
   coins = coins + 12;
   coins = coins - 4;
   console.log(coins);
6. 6.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) let
7. 7.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) if
8. 8.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 5;
   console.log(x + y); (a) 45 (b) Error (c) 9
10. 10.⚡ What number does this code print?
    let a = 51;
    let b = 24;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 33;
    let b = 16;
    console.log(a - b);
12. 12.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) for
14. 14.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) if (d) for
15. 15.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 12;
    runs = runs - 14;
    console.log(runs);
16. 16.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 9 (c) 18
18. 18.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 13;
    apples = apples - 9;
    console.log(apples);
19. 19.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 10;
    apples = apples - 1;
    console.log(apples);
20. 20.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 2;
    runs = runs - 12;
    console.log(runs);
21. 21.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 2;
    apples = apples - 11;
    console.log(apples);
22. 22.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) let
23. 23.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a - b);
24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) name (d) Hello, name!
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!
26. 26.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
27. 27.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
29. 29.⚡ What number does this code print?
    let score = 25;
    score = score + 13;
    score = score - 33;
    console.log(score);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 17 (b) Error (c) 89
31. 31.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
32. 32.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, Arjun! (d) Hi, name!
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 51 (b) Error (c) 6
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 15 (c) 96
35. 35.⚡ What number does this code print?
    let a = 14;
    let b = 26;
    console.log(a + b);
36. 36.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
37. 37.⚡ What number does this code print?
    let a = 4;
    let b = 9;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let score = 24;
    score = score + 6;
    score = score - 24;
    console.log(score);
39. 39.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 17;
    runs = runs - 11;
    console.log(runs);

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