JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 624 · 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 makes a new variable? (a) alert() (b) for (c) if (d) let
2. 2.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 5;
   console.log(x + y); (a) Error (b) 7 (c) 25
4. 4.⚡ What number does this code print?
   let a = 13;
   let b = 3;
   console.log(a + b);
5. 5.⚡ What number does this code print?
   let a = 24;
   let b = 23;
   console.log(a - b);
6. 6.⚡ What number does this code print?
   let marks = 15;
   marks = marks + 4;
   marks = marks - 19;
   console.log(marks);
7. 7.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) alert() (d) if
8. 8.⚡ What number does this code print?
   let apples = 27;
   apples = apples + 14;
   apples = apples - 32;
   console.log(apples);
9. 9.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
11. 11.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, Meera! (d) Hello, name!
12. 12.⚡ What number does this code print?
    let a = 29;
    let b = 1;
    console.log(a + b);
13. 13.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Well done, name! (c) Meera (d) name
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
15. 15.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
16. 16.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let a = 43;
    let b = 14;
    console.log(a + b);
18. 18.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
19. 19.⚡ What number does this code print?
    let a = 27;
    let b = 21;
    console.log(a + b);
20. 20.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) for (d) if
21. 21.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) alert()
22. 22.⚡ What number does this code print?
    let score = 26;
    score = score + 19;
    score = score - 39;
    console.log(score);
23. 23.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) 13 (c) Error
25. 25.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) name (d) Hi, Riya!
26. 26.⚡ 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
27. 27.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a * b);
28. 28.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) alert() (d) for
29. 29.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) name (d) Hi, name!
30. 30.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Arjun! (d) Arjun
31. 31.⚡ What number does this code print?
    let a = 46;
    let b = 25;
    console.log(a + b);
32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Zoya! (d) Zoya
33. 33.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, Aman! (d) Well done, name!
35. 35.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 17;
    apples = apples - 13;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let a = 32;
    let b = 22;
    console.log(a + b);
38. 38.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Zoya! (d) Zoya
39. 39.⚡ What number does this code print?
    let a = 40;
    let b = 27;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Riya (d) Hello, Riya!

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