JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 760 · 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 JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) let (d) if
2. 2.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Aman! (d) Aman
3. 3.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
4. 4.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
5. 5.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
6. 6.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
7. 7.⚡ 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
8. 8.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) let (d) if
9. 9.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
10. 10.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 14;
    apples = apples - 7;
    console.log(apples);
11. 11.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 4;
    apples = apples - 9;
    console.log(apples);
12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, Kabir! (b) Kabir (c) Hi, name! (d) name
13. 13.⚡ What number does this code print?
    let score = 30;
    score = score + 7;
    score = score - 14;
    console.log(score);
14. 14.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
15. 15.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
16. 16.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Arjun (d) Hello, name!
17. 17.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Meera! (d) Meera
18. 18.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 5;
    runs = runs - 8;
    console.log(runs);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 10 (c) 82
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
21. 21.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) name (d) Hi, Arjun!
22. 22.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, Aman! (d) Hi, name!
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 69 (b) 15 (c) Error
24. 24.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) name (d) Welcome, name!
26. 26.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a + b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 9 (c) 81
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 71 (c) 8
29. 29.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) alert() (d) let
30. 30.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) alert() (d) if
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) name (d) Kabir
32. 32.⚡ What number does this code print?
    let a = 42;
    let b = 29;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 13 (c) 67
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) Error (c) 55
35. 35.⚡ What number does this code print?
    let a = 38;
    let b = 24;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) 13 (c) Error
38. 38.⚡ What number does this code print?
    let a = 57;
    let b = 2;
    console.log(a - b);
39. 39.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) console.log() (d) for
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 72 (c) 9

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