JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 817 · 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 this code print? (Look at the quotes!)
   let x = "5";
   let y = 7;
   console.log(x + y); (a) 12 (b) Error (c) 57
2. 2.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) let
3. 3.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) if (d) let
4. 4.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
5. 5.⚡ What number does this code print?
   let coins = 29;
   coins = coins + 12;
   coins = coins - 12;
   console.log(coins);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
7. 7.⚡ What number does this code print?
   let a = 3;
   let b = 11;
   console.log(a * b);
8. 8.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
9. 9.⚡ What does this code show?
   let name = "Zoya";
   alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Zoya (d) Hi, Zoya!
10. 10.⚡ What number does this code print?
    let a = 6;
    let b = 3;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let a = 3;
    let b = 7;
    console.log(a * b);
12. 12.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) let
14. 14.⚡ What number does this code print?
    let a = 34;
    let b = 14;
    console.log(a + b);
15. 15.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, name! (d) Hi, Meera!
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 10 (b) 37 (c) Error
17. 17.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
18. 18.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) console.log() (d) for
19. 19.⚡ What number does this code print?
    let a = 17;
    let b = 38;
    console.log(a + b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) 4 (c) Error
21. 21.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 15;
    runs = runs - 12;
    console.log(runs);
23. 23.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) Error (c) 34
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
26. 26.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
27. 27.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 12;
    coins = coins - 9;
    console.log(coins);
28. 28.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
29. 29.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
30. 30.⚡ What number does this code print?
    let marks = 28;
    marks = marks + 18;
    marks = marks - 35;
    console.log(marks);
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) Hello, name! (d) name
32. 32.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 9;
    coins = coins - 10;
    console.log(coins);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) 4 (c) Error
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
35. 35.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) console.log() (d) for
36. 36.⚡ What number does this code print?
    let a = 57;
    let b = 36;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let a = 47;
    let b = 12;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 60;
    let b = 39;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 13;
    let b = 11;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 8;
    let b = 10;
    console.log(a * b);

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