JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 419 · 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 writes in the console? (a) alert() (b) let (c) for (d) console.log()
2. 2.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) let (d) for
3. 3.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Kabir! (d) Kabir
4. 4.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
5. 5.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) let (d) if
6. 6.⚡ What number does this code print?
   let a = 37;
   let b = 20;
   console.log(a - b);
7. 7.⚡ What number does this code print?
   let a = 6;
   let b = 1;
   console.log(a + b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 1;
   console.log(x + y); (a) 2 (b) 11 (c) Error
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 6;
   console.log(x + y); (a) 86 (b) Error (c) 14
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) Error (b) 12 (c) 57
11. 11.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) name (d) Welcome, name!
12. 12.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Hello, name! (d) Riya
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 18 (c) 9
14. 14.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 4;
    apples = apples - 15;
    console.log(apples);
15. 15.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
16. 16.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Arjun (d) Well done, name!
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 74 (b) 11 (c) Error
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) for (d) let
19. 19.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 8;
    coins = coins - 24;
    console.log(coins);
20. 20.⚡ 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
21. 21.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
22. 22.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Zoya! (d) Zoya
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 19 (c) 10
24. 24.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a * b);
25. 25.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
26. 26.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) Meera (c) name (d) Hi, name!
27. 27.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 2;
    marks = marks - 5;
    console.log(marks);
28. 28.⚡ What number does this code print?
    let a = 30;
    let b = 24;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 69 (b) Error (c) 15
30. 30.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 14;
    coins = coins - 1;
    console.log(coins);
31. 31.⚡ What number does this code print?
    let a = 35;
    let b = 33;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 54 (b) 9 (c) Error
33. 33.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
34. 34.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 16;
    apples = apples - 24;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let a = 24;
    let b = 11;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 18;
    coins = coins - 3;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let a = 59;
    let b = 5;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
39. 39.⚡ What number does this code print?
    let a = 32;
    let b = 7;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5

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