JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 497 · 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 tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
2. 2.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) Hello, Zoya! (d) name
3. 3.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
4. 4.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) console.log()
5. 5.⚡ What number does this code print?
   let a = 32;
   let b = 30;
   console.log(a + b);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 9;
   console.log(x + y); (a) Error (b) 59 (c) 14
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) 10 (b) 82 (c) Error
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 9;
   console.log(x + y); (a) 99 (b) 18 (c) Error
9. 9.⚡ What number does this code print?
   let a = 7;
   let b = 12;
   console.log(a * b);
10. 10.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) console.log() (d) alert()
12. 12.⚡ What number does this code print?
    let a = 40;
    let b = 15;
    console.log(a + b);
13. 13.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
14. 14.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 58 (c) 13
16. 16.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
17. 17.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) if
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Riya! (d) Riya
19. 19.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) on the title bar (d) in the address bar
20. 20.⚡ What number does this code print?
    let books = 7;
    books = books + 17;
    books = books - 20;
    console.log(books);
21. 21.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
22. 22.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) name (d) Kabir
23. 23.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 14;
    runs = runs - 6;
    console.log(runs);
25. 25.⚡ What number does this code print?
    let score = 20;
    score = score + 13;
    score = score - 14;
    console.log(score);
26. 26.⚡ What number does this code print?
    let books = 25;
    books = books + 8;
    books = books - 21;
    console.log(books);
27. 27.⚡ What number does this code print?
    let a = 9;
    let b = 3;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Zoya (d) Hello, Zoya!
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) name (d) Welcome, name!
30. 30.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) alert() (d) let
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) Error (c) 53
32. 32.⚡ What number does this code print?
    let a = 8;
    let b = 10;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 38;
    let b = 5;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let score = 12;
    score = score + 20;
    score = score - 18;
    console.log(score);
35. 35.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
36. 36.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, Zoya! (d) Well done, name!
37. 37.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 12;
    coins = coins - 33;
    console.log(coins);
38. 38.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, Arjun! (d) Well done, name!
39. 39.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Kabir (d) Welcome, Kabir!
40. 40.⚡ What number does this code print?
    let a = 17;
    let b = 31;
    console.log(a + b);

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