JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 363 · 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 word makes a new variable? (a) put (b) make (c) give (d) let
2. 2.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) if (d) for
3. 3.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Kabir! (d) Kabir
4. 4.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
5. 5.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) console.log()
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) let (d) alert()
7. 7.⚡ What number does this code print?
   let a = 21;
   let b = 37;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 53;
   let b = 30;
   console.log(a - b);
9. 9.⚡ What number does this code print?
   let runs = 5;
   runs = runs + 4;
   runs = runs - 5;
   console.log(runs);
10. 10.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Meera (d) Hi, name!
11. 11.⚡ What number does this code print?
    let score = 26;
    score = score + 13;
    score = score - 26;
    console.log(score);
12. 12.⚡ What number does this code print?
    let a = 16;
    let b = 6;
    console.log(a + b);
13. 13.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
14. 14.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) Kabir (d) name
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Riya (d) Hello, Riya!
16. 16.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
17. 17.⚡ What number does this code print?
    let a = 8;
    let b = 2;
    console.log(a * b);
18. 18.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Meera! (d) Meera
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 4 (b) Error (c) 22
20. 20.⚡ What number does this code print?
    let a = 6;
    let b = 20;
    console.log(a + b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) 55 (c) Error
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
23. 23.⚡ What number does this code print?
    let books = 7;
    books = books + 17;
    books = books - 13;
    console.log(books);
24. 24.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) let (d) if
25. 25.⚡ What number does this code print?
    let a = 3;
    let b = 10;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 8;
    apples = apples - 11;
    console.log(apples);
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) name (d) Riya
28. 28.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) alert() (d) if
29. 29.⚡ What number does this code print?
    let a = 8;
    let b = 6;
    console.log(a * b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) Error (c) 62
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 25 (b) Error (c) 7
32. 32.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 46;
    let b = 16;
    console.log(a - b);
34. 34.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Aman! (d) Aman
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) 17 (c) Error
37. 37.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 10;
    coins = coins - 17;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) name (d) Hello, name!
40. 40.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 19;
    runs = runs - 14;
    console.log(runs);

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