JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 627 · 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 number does this code print?
   let a = 11;
   let b = 9;
   console.log(a * b);
2. 2.⚡ What number does this code print?
   let a = 4;
   let b = 4;
   console.log(a * b);
3. 3.⚡ What number does this code print?
   let a = 9;
   let b = 4;
   console.log(a * b);
4. 4.⚡ What number does this code print?
   let a = 49;
   let b = 40;
   console.log(a - b);
5. 5.⚡ What number does this code print?
   let coins = 15;
   coins = coins + 10;
   coins = coins - 6;
   console.log(coins);
6. 6.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) if
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 3;
   console.log(x + y); (a) Error (b) 11 (c) 83
8. 8.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) alert()
9. 9.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
10. 10.⚡ What number does this code print?
    let a = 23;
    let b = 10;
    console.log(a - b);
11. 11.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!
12. 12.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) alert() (d) for
13. 13.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) name (d) Hi, Kabir!
14. 14.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
15. 15.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, Meera! (d) Hi, name!
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 8 (c) 71
17. 17.⚡ What number does this code print?
    let a = 40;
    let b = 4;
    console.log(a - b);
18. 18.⚡ What number does this code print?
    let a = 30;
    let b = 9;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 58;
    let b = 4;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 14;
    marks = marks - 1;
    console.log(marks);
21. 21.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, name! (d) Hi, Riya!
22. 22.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
23. 23.⚡ What number does this code print?
    let a = 36;
    let b = 1;
    console.log(a + b);
24. 24.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) for
25. 25.⚡ 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
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) name (d) Well done, Kabir!
27. 27.⚡ What number does this code print?
    let a = 54;
    let b = 20;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 5;
    coins = coins - 4;
    console.log(coins);
29. 29.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) Error (c) 5
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
32. 32.⚡ What number does this code print?
    let a = 17;
    let b = 12;
    console.log(a - b);
33. 33.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, name! (d) Well done, Zoya!
34. 34.⚡ What number does this code print?
    let a = 12;
    let b = 6;
    console.log(a - b);
35. 35.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
36. 36.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 43 (b) 7 (c) Error
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) 44 (c) Error
39. 39.⚡ What number does this code print?
    let a = 19;
    let b = 9;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 21;
    let b = 1;
    console.log(a + b);

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