JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 512 · 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.⚡ 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
2. 2.⚡ What number does this code print?
   let runs = 30;
   runs = runs + 16;
   runs = runs - 25;
   console.log(runs);
3. 3.⚡ What number does this code print?
   let apples = 9;
   apples = apples + 7;
   apples = apples - 2;
   console.log(apples);
4. 4.⚡ 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
5. 5.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Aman (d) Welcome, Aman!
6. 6.⚡ What does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
7. 7.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) alert()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 8;
   console.log(x + y); (a) Error (b) 13 (c) 58
9. 9.⚡ What number does this code print?
   let a = 3;
   let b = 11;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, Arjun! (d) Well done, name!
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) Error (c) 83
12. 12.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) alert()
13. 13.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a * b);
14. 14.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 17;
    marks = marks - 23;
    console.log(marks);
15. 15.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
16. 16.⚡ What number does this code print?
    let a = 30;
    let b = 5;
    console.log(a + b);
17. 17.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) if
18. 18.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 14;
    runs = runs - 5;
    console.log(runs);
19. 19.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
20. 20.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
21. 21.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Riya (d) Welcome, name!
22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Arjun (d) Well done, name!
23. 23.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let a = 53;
    let b = 17;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 5;
    coins = coins - 9;
    console.log(coins);
26. 26.⚡ What number does this code print?
    let a = 19;
    let b = 37;
    console.log(a + b);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) Hi, name! (d) name
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) Error (c) 5
30. 30.⚡ What number does this code print?
    let a = 25;
    let b = 33;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Arjun! (d) Arjun
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
33. 33.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) if (d) let
34. 34.⚡ What number does this code print?
    let a = 42;
    let b = 19;
    console.log(a - b);
35. 35.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
36. 36.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);
37. 37.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
38. 38.⚡ What number does this code print?
    let a = 2;
    let b = 9;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
40. 40.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Welcome, name! (d) Kabir

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