JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 440 · 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 print? (Look at the quotes!)
   let x = "5";
   let y = 2;
   console.log(x + y); (a) 52 (b) 7 (c) Error
2. 2.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) alert() (d) console.log()
3. 3.⚡ What number does this code print?
   let score = 11;
   score = score + 11;
   score = score - 5;
   console.log(score);
4. 4.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) console.log()
5. 5.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
6. 6.⚡ What number does this code print?
   let score = 16;
   score = score + 17;
   score = score - 3;
   console.log(score);
7. 7.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) let (d) if
8. 8.⚡ Which word makes a new variable? (a) put (b) make (c) let (d) give
9. 9.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) Well done, name! (d) name
10. 10.⚡ What number does this code print?
    let score = 25;
    score = score + 18;
    score = score - 41;
    console.log(score);
11. 11.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) let
12. 12.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 19;
    apples = apples - 7;
    console.log(apples);
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) for
15. 15.⚡ What number does this code print?
    let books = 29;
    books = books + 7;
    books = books - 23;
    console.log(books);
16. 16.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 2;
    apples = apples - 17;
    console.log(apples);
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) Hi, name! (d) name
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 53 (b) Error (c) 8
19. 19.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Meera (d) Welcome, name!
21. 21.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 53;
    let b = 19;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 15;
    coins = coins - 10;
    console.log(coins);
24. 24.⚡ What number does this code print?
    let score = 7;
    score = score + 17;
    score = score - 8;
    console.log(score);
25. 25.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, Aman! (c) name (d) Well done, name!
26. 26.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 15;
    apples = apples - 22;
    console.log(apples);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) Error (c) 10
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, name! (d) Welcome, Zoya!
29. 29.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
30. 30.⚡ What number does this code print?
    let a = 8;
    let b = 3;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, name! (d) Welcome, Meera!
32. 32.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
33. 33.⚡ What number does this code print?
    let a = 54;
    let b = 36;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let books = 28;
    books = books + 3;
    books = books - 2;
    console.log(books);
35. 35.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, Aman! (d) Hello, name!
36. 36.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
37. 37.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) Hi, name! (c) name (d) Meera
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Kabir (d) Welcome, name!
39. 39.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 87 (c) 15

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