JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 271 · 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 alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
2. 2.⚡ What number does this code print?
   let a = 3;
   let b = 8;
   console.log(a * b);
3. 3.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 3;
   console.log(x + y); (a) Error (b) 83 (c) 11
5. 5.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) let (d) console.log()
6. 6.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!
7. 7.⚡ What number does this code print?
   let coins = 23;
   coins = coins + 8;
   coins = coins - 18;
   console.log(coins);
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) if
9. 9.⚡ 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
10. 10.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
12. 12.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
13. 13.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 8;
    apples = apples - 9;
    console.log(apples);
14. 14.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a * b);
15. 15.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, Zoya! (d) Well done, name!
16. 16.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Arjun (d) Hello, Arjun!
17. 17.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Welcome, name! (d) Zoya
18. 18.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
19. 19.⚡ What number does this code print?
    let a = 25;
    let b = 26;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 8;
    runs = runs - 12;
    console.log(runs);
21. 21.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) let (d) alert()
22. 22.⚡ What number does this code print?
    let books = 8;
    books = books + 3;
    books = books - 7;
    console.log(books);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 63 (c) 9
24. 24.⚡ What number does this code print?
    let a = 51;
    let b = 7;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) Meera (d) name
26. 26.⚡ What number does this code print?
    let apples = 13;
    apples = apples + 18;
    apples = apples - 1;
    console.log(apples);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) Error (c) 64
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 4 (c) 13
29. 29.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, Aman! (d) Welcome, name!
31. 31.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) for (d) let
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) Error (b) 6 (c) 33
33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Kabir (d) Well done, name!
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 6 (c) 15
36. 36.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) for (d) if
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 98 (b) 17 (c) Error
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Well done, name! (d) Kabir
39. 39.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) name (d) Hi, Riya!
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) 11 (c) Error

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