JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 918 · 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) console.log() (b) if (c) let (d) for
2. 2.⚡ What does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Meera (d) Welcome, Meera!
3. 3.⚡ What number does this code print?
   let a = 36;
   let b = 10;
   console.log(a - b);
4. 4.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
5. 5.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) alert()
6. 6.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
7. 7.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) Hello, Kabir! (d) name
8. 8.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 6;
   console.log(x + y); (a) Error (b) 11 (c) 56
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) Error (c) 52
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) 73 (c) Error
12. 12.⚡ What number does this code print?
    let a = 15;
    let b = 5;
    console.log(a + b);
13. 13.⚡ What number does this code print?
    let a = 13;
    let b = 7;
    console.log(a + b);
14. 14.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
15. 15.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
16. 16.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) if (d) console.log()
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) Hello, Kabir! (d) name
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) let
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Zoya (d) Well done, Zoya!
20. 20.⚡ What number does this code print?
    let a = 47;
    let b = 16;
    console.log(a + b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) 72 (c) Error
22. 22.⚡ What number does this code print?
    let books = 11;
    books = books + 6;
    books = books - 12;
    console.log(books);
23. 23.⚡ What number does this code print?
    let a = 50;
    let b = 36;
    console.log(a + b);
24. 24.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
25. 25.⚡ 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
26. 26.⚡ What number does this code print?
    let a = 11;
    let b = 15;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 10;
    let b = 4;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) Error (c) 13
29. 29.⚡ What number does this code print?
    let a = 20;
    let b = 20;
    console.log(a + b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 11 (b) 92 (c) Error
31. 31.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 5;
    runs = runs - 16;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let a = 31;
    let b = 14;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 34;
    let b = 24;
    console.log(a - b);
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) name (c) Zoya (d) Hello, name!
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 38 (b) 11 (c) Error
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) Error (c) 8
37. 37.⚡ What number does this code print?
    let a = 25;
    let b = 17;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 10;
    coins = coins - 34;
    console.log(coins);
40. 40.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>

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