JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 787 · 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 number does this code print?
   let a = 14;
   let b = 6;
   console.log(a + b);
2. 2.⚡ Which JavaScript word repeats code? (a) if (b) let (c) console.log() (d) for
3. 3.⚡ What number does this code print?
   let apples = 17;
   apples = apples + 9;
   apples = apples - 22;
   console.log(apples);
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) console.log()
5. 5.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Aman (d) Well done, name!
6. 6.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
7. 7.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
8. 8.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
9. 9.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Hello, name! (d) Meera
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 9 (c) 72
11. 11.⚡ What number does this code print?
    let a = 55;
    let b = 18;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 36;
    let b = 16;
    console.log(a + b);
13. 13.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
14. 14.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 8;
    runs = runs - 5;
    console.log(runs);
15. 15.⚡ What number does this code print?
    let a = 55;
    let b = 37;
    console.log(a + b);
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .css (d) .jpg
17. 17.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) name (d) Hi, name!
18. 18.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) 42 (c) Error
20. 20.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) alert()
21. 21.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) for (d) let
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 6 (c) 51
23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Welcome, name! (d) Zoya
24. 24.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) let (d) for
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) 34 (c) Error
26. 26.⚡ What number does this code print?
    let a = 30;
    let b = 10;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 5;
    let b = 9;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) Error (c) 8
29. 29.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
30. 30.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) 85 (c) Error
32. 32.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) Hello, name! (c) name (d) Hello, Zoya!
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 4 (c) 13
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Meera (c) Welcome, name! (d) Welcome, Meera!
35. 35.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 10;
    apples = apples - 11;
    console.log(apples);
36. 36.⚡ What number does this code print?
    let score = 28;
    score = score + 7;
    score = score - 24;
    console.log(score);
37. 37.⚡ What number does this code print?
    let a = 4;
    let b = 3;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 34;
    let b = 21;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) name (d) Welcome, name!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 14 (b) Error (c) 95

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