JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 435 · 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 repeats code? (a) alert() (b) if (c) let (d) for
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) alert() (d) let
3. 3.⚡ What number does this code print?
   let a = 3;
   let b = 6;
   console.log(a * b);
4. 4.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Hi, name! (d) Arjun
5. 5.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) alert() (d) console.log()
6. 6.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) 12 (b) 48 (c) Error
8. 8.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 3;
   console.log(x + y); (a) Error (b) 33 (c) 6
10. 10.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) on the title bar (d) in the address bar
11. 11.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) for (d) alert()
12. 12.⚡ What number does this code print?
    let a = 23;
    let b = 23;
    console.log(a + b);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) Error (b) 9 (c) 54
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) name (b) Kabir (c) Well done, Kabir! (d) Well done, name!
15. 15.⚡ What number does this code print?
    let score = 16;
    score = score + 9;
    score = score - 6;
    console.log(score);
16. 16.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 11;
    apples = apples - 11;
    console.log(apples);
17. 17.⚡ What number does this code print?
    let a = 4;
    let b = 3;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let a = 27;
    let b = 13;
    console.log(a - b);
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
20. 20.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) alert() (d) console.log()
21. 21.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Riya (d) Hello, name!
22. 22.⚡ What number does this code print?
    let a = 9;
    let b = 34;
    console.log(a + b);
23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Hi, name! (d) Aman
24. 24.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) Hi, Riya! (d) name
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 75 (c) 12
27. 27.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 16;
    runs = runs - 1;
    console.log(runs);
28. 28.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 12;
    apples = apples - 3;
    console.log(apples);
29. 29.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
30. 30.⚡ What number does this code print?
    let books = 18;
    books = books + 9;
    books = books - 1;
    console.log(books);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 5 (c) 14
32. 32.⚡ What number does this code print?
    let score = 21;
    score = score + 17;
    score = score - 30;
    console.log(score);
33. 33.⚡ What number does this code print?
    let a = 14;
    let b = 35;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
35. 35.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, Kabir! (c) Hi, name! (d) name
36. 36.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 4;
    coins = coins - 11;
    console.log(coins);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 77 (b) Error (c) 14
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) Error (c) 9
40. 40.⚡ What number does this code print?
    let books = 18;
    books = books + 3;
    books = books - 7;
    console.log(books);

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