JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 373 · 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 = "Arjun";
   alert("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, name! (d) Well done, Arjun!
2. 2.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) if (d) console.log()
3. 3.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) alert()
4. 4.⚡ What number does this code print?
   let a = 48;
   let b = 26;
   console.log(a - b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 6;
   console.log(x + y); (a) 46 (b) 10 (c) Error
6. 6.⚡ What number does this code print?
   let apples = 24;
   apples = apples + 3;
   apples = apples - 9;
   console.log(apples);
7. 7.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) for (d) console.log()
8. 8.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
9. 9.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Zoya (c) name (d) Well done, name!
10. 10.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
11. 11.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
12. 12.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) for
13. 13.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Kabir (d) Well done, Kabir!
14. 14.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
15. 15.⚡ What number does this code print?
    let a = 42;
    let b = 39;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a + b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) 56 (c) Error
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) let (d) alert()
19. 19.⚡ What number does this code print?
    let a = 60;
    let b = 38;
    console.log(a - b);
20. 20.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 66 (b) 12 (c) Error
22. 22.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 18;
    coins = coins - 4;
    console.log(coins);
23. 23.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 20;
    coins = coins - 15;
    console.log(coins);
24. 24.⚡ What number does this code print?
    let a = 34;
    let b = 32;
    console.log(a + b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) Error (b) 64 (c) 10
26. 26.⚡ What number does this code print?
    let books = 24;
    books = books + 3;
    books = books - 11;
    console.log(books);
27. 27.⚡ What number does this code print?
    let a = 32;
    let b = 9;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Welcome, name! (d) Meera
29. 29.⚡ What number does this code print?
    let a = 48;
    let b = 28;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 52;
    let b = 20;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) Error (c) 28
32. 32.⚡ What number does this code print?
    let a = 55;
    let b = 11;
    console.log(a - b);
33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) Hello, Kabir! (d) name
34. 34.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 17;
    runs = runs - 39;
    console.log(runs);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) 10 (c) Error
36. 36.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 10 (b) Error (c) 91
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Meera (d) Hi, name!
39. 39.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, Arjun! (d) Hi, name!
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Aman (d) Hello, name!

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