JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 507 · 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) <js> (c) <script> (d) <code>
2. 2.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) if
3. 3.⚡ What number does this code print?
   let a = 45;
   let b = 17;
   console.log(a - b);
4. 4.⚡ What number does this code print?
   let apples = 25;
   apples = apples + 10;
   apples = apples - 30;
   console.log(apples);
5. 5.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) console.log() (d) if
6. 6.⚡ What number does this code print?
   let a = 27;
   let b = 10;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let apples = 12;
   apples = apples + 6;
   apples = apples - 18;
   console.log(apples);
8. 8.⚡ What number does this code print?
   let score = 28;
   score = score + 11;
   score = score - 32;
   console.log(score);
9. 9.⚡ What number does this code print?
   let a = 6;
   let b = 4;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, name! (d) Hi, Aman!
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Riya! (d) Riya
12. 12.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) console.log() (d) let
13. 13.⚡ What number does this code print?
    let a = 50;
    let b = 21;
    console.log(a + b);
14. 14.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) name (d) Arjun
15. 15.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) if (d) console.log()
16. 16.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
17. 17.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Meera! (d) Meera
18. 18.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 14;
    apples = apples - 15;
    console.log(apples);
19. 19.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let a = 2;
    let b = 9;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 11;
    let b = 5;
    console.log(a * b);
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
23. 23.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
24. 24.⚡ What number does this code print?
    let a = 12;
    let b = 24;
    console.log(a + b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
26. 26.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
27. 27.⚡ What number does this code print?
    let a = 6;
    let b = 8;
    console.log(a * b);
28. 28.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) console.log()
29. 29.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 12;
    runs = runs - 2;
    console.log(runs);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 87 (c) 15
31. 31.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
32. 32.⚡ What number does this code print?
    let a = 27;
    let b = 8;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 5;
    apples = apples - 8;
    console.log(apples);
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Aman (d) Hi, name!
35. 35.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
36. 36.⚡ What number does this code print?
    let a = 31;
    let b = 29;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 40;
    let b = 26;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 3;
    let b = 8;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 9;
    apples = apples - 31;
    console.log(apples);
40. 40.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name

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