JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 615 · 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 show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Meera (d) Hello, Meera!
2. 2.⚡ What number does this code print?
   let coins = 18;
   coins = coins + 15;
   coins = coins - 9;
   console.log(coins);
3. 3.⚡ What number does this code print?
   let a = 9;
   let b = 6;
   console.log(a * b);
4. 4.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
7. 7.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
8. 8.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) alert()
9. 9.⚡ What number does this code print?
   let a = 41;
   let b = 33;
   console.log(a - b);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) for (d) alert()
11. 11.⚡ What number does this code print?
    let score = 16;
    score = score + 6;
    score = score - 1;
    console.log(score);
12. 12.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
13. 13.⚡ What number does this code print?
    let a = 6;
    let b = 12;
    console.log(a * b);
14. 14.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) alert() (d) for
15. 15.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) name (d) Hi, Meera!
16. 16.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Zoya! (d) Zoya
17. 17.⚡ What number does this code print?
    let books = 21;
    books = books + 19;
    books = books - 4;
    console.log(books);
18. 18.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 4;
    marks = marks - 15;
    console.log(marks);
19. 19.⚡ What number does this code print?
    let a = 25;
    let b = 18;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 36;
    let b = 15;
    console.log(a + b);
21. 21.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) alert() (d) let
22. 22.⚡ What number does this code print?
    let a = 14;
    let b = 3;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 7;
    let b = 12;
    console.log(a * b);
24. 24.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) if (d) console.log()
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 67 (c) 13
26. 26.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 13;
    runs = runs - 10;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
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 number does this code print?
    let books = 19;
    books = books + 3;
    books = books - 11;
    console.log(books);
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) name (c) Welcome, name! (d) Aman
31. 31.⚡ What number does this code print?
    let a = 6;
    let b = 35;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 6;
    marks = marks - 4;
    console.log(marks);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 10 (c) 82
34. 34.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
35. 35.⚡ What number does this code print?
    let a = 16;
    let b = 3;
    console.log(a + b);
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
37. 37.⚡ What number does this code print?
    let a = 46;
    let b = 13;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 8;
    runs = runs - 9;
    console.log(runs);
39. 39.⚡ What number does this code print?
    let a = 34;
    let b = 28;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera

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