JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 409 · 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 show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Kabir (d) Hi, Kabir!
2. 2.⚡ What does this code show?
   let name = "Meera";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
3. 3.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) let
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
6. 6.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
7. 7.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) console.log()
8. 8.⚡ What number does this code print?
   let coins = 5;
   coins = coins + 15;
   coins = coins - 2;
   console.log(coins);
9. 9.⚡ What number does this code print?
   let a = 10;
   let b = 1;
   console.log(a - b);
10. 10.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 7;
    coins = coins - 4;
    console.log(coins);
11. 11.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
12. 12.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) Error (b) 8 (c) 35
14. 14.⚡ What number does this code print?
    let a = 27;
    let b = 5;
    console.log(a - b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 14 (b) 68 (c) Error
16. 16.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Arjun (d) Hello, Arjun!
17. 17.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 10;
    coins = coins - 20;
    console.log(coins);
18. 18.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) let (d) if
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) 24 (c) Error
20. 20.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
21. 21.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
22. 22.⚡ What number does this code print?
    let a = 13;
    let b = 11;
    console.log(a - b);
23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) Well done, Aman! (d) name
24. 24.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 5 (c) 23
26. 26.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 10;
    marks = marks - 25;
    console.log(marks);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) Error (b) 14 (c) 59
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 41 (b) 5 (c) Error
29. 29.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) if (d) let
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 10 (b) Error (c) 37
31. 31.⚡ What number does this code print?
    let score = 16;
    score = score + 14;
    score = score - 4;
    console.log(score);
32. 32.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Arjun (d) Hello, Arjun!
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 7 (c) 43
34. 34.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 9;
    coins = coins - 26;
    console.log(coins);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) Error (c) 11
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) 9 (c) Error
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
38. 38.⚡ What number does this code print?
    let a = 19;
    let b = 21;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 3;
    marks = marks - 4;
    console.log(marks);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 10 (c) 19

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