JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 699 · 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 number does this code print?
   let score = 7;
   score = score + 5;
   score = score - 3;
   console.log(score);
2. 2.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
3. 3.⚡ What does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Meera! (d) Meera
4. 4.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) Zoya (d) name
5. 5.⚡ What number does this code print?
   let marks = 6;
   marks = marks + 3;
   marks = marks - 1;
   console.log(marks);
6. 6.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
7. 7.⚡ What number does this code print?
   let books = 15;
   books = books + 11;
   books = books - 18;
   console.log(books);
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) let
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 3;
   console.log(x + y); (a) 83 (b) 11 (c) Error
10. 10.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) alert() (d) let
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) Error (c) 15
12. 12.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Zoya! (d) Zoya
13. 13.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) let (d) alert()
14. 14.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) for (d) if
15. 15.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
16. 16.⚡ What number does this code print?
    let a = 46;
    let b = 6;
    console.log(a + b);
17. 17.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Zoya! (d) Zoya
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Aman (d) Welcome, Aman!
19. 19.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) let (d) if
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) Error (c) 36
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) Error (c) 43
22. 22.⚡ What number does this code print?
    let a = 13;
    let b = 28;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 52;
    let b = 1;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 12;
    apples = apples - 19;
    console.log(apples);
25. 25.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
26. 26.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, name! (d) Hi, Zoya!
27. 27.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
29. 29.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 7;
    apples = apples - 1;
    console.log(apples);
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
31. 31.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 2;
    runs = runs - 1;
    console.log(runs);
32. 32.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Hello, name! (d) Kabir
33. 33.⚡ What number does this code print?
    let score = 10;
    score = score + 17;
    score = score - 15;
    console.log(score);
34. 34.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 6;
    marks = marks - 24;
    console.log(marks);
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) Hi, name! (d) name
36. 36.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 15;
    apples = apples - 19;
    console.log(apples);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) 24 (c) Error
38. 38.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Aman (d) Hi, name!
40. 40.⚡ What number does this code print?
    let a = 53;
    let b = 26;
    console.log(a + b);

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