JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 232 · 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 = "Zoya";
   console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) Hi, name! (d) name
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
3. 3.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 2;
   console.log(x + y); (a) Error (b) 12 (c) 3
5. 5.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
6. 6.⚡ What number does this code print?
   let score = 13;
   score = score + 14;
   score = score - 27;
   console.log(score);
7. 7.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) console.log() (d) for
8. 8.⚡ What number does this code print?
   let marks = 13;
   marks = marks + 3;
   marks = marks - 7;
   console.log(marks);
9. 9.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) if (d) let
10. 10.⚡ What number does this code print?
    let a = 6;
    let b = 27;
    console.log(a + b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) Error (b) 45 (c) 9
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 94 (c) 13
13. 13.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
14. 14.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
15. 15.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
16. 16.⚡ What number does this code print?
    let a = 44;
    let b = 40;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let score = 15;
    score = score + 19;
    score = score - 13;
    console.log(score);
18. 18.⚡ Which JavaScript word repeats code? (a) for (b) let (c) console.log() (d) if
19. 19.⚡ What number does this code print?
    let a = 44;
    let b = 27;
    console.log(a + b);
20. 20.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) Kabir (d) name
21. 21.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) alert() (d) if
22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) name (d) Well done, name!
23. 23.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 40;
    let b = 18;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 54;
    let b = 22;
    console.log(a - b);
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) Hello, name! (d) name
27. 27.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let a = 49;
    let b = 13;
    console.log(a - b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) Error (c) 34
30. 30.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a * b);
32. 32.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
33. 33.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) name (d) Aman
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) Welcome, name! (d) name
35. 35.⚡ What number does this code print?
    let a = 10;
    let b = 20;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 23;
    let b = 9;
    console.log(a - b);
37. 37.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Arjun (d) Hello, Arjun!
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, name! (d) Hello, Meera!
39. 39.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let a = 40;
    let b = 12;
    console.log(a - b);

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