JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 31 · 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 = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 4;
   console.log(x + y); (a) Error (b) 84 (c) 12
3. 3.⚡ What number does this code print?
   let a = 45;
   let b = 28;
   console.log(a - b);
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) let (d) alert()
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) 8 (b) Error (c) 17
6. 6.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
7. 7.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) name (d) Hi, name!
8. 8.⚡ What number does this code print?
   let a = 43;
   let b = 25;
   console.log(a - b);
9. 9.⚡ What number does this code print?
   let apples = 21;
   apples = apples + 6;
   apples = apples - 15;
   console.log(apples);
10. 10.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) if
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 98 (b) 17 (c) Error
14. 14.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) let
15. 15.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
16. 16.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) console.log() (d) alert()
17. 17.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
18. 18.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Arjun (d) Hi, Arjun!
19. 19.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Hi, name! (d) Arjun
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) Error (c) 28
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) Error (b) 65 (c) 11
22. 22.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 20;
    apples = apples - 4;
    console.log(apples);
23. 23.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
24. 24.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) name (d) Zoya
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) 29 (c) Error
26. 26.⚡ What number does this code print?
    let a = 50;
    let b = 7;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
28. 28.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 2;
    apples = apples - 6;
    console.log(apples);
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 24 (b) 6 (c) Error
31. 31.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 3;
    marks = marks - 2;
    console.log(marks);
32. 32.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) alert() (d) if
33. 33.⚡ What number does this code print?
    let a = 26;
    let b = 26;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let a = 11;
    let b = 18;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) Error (c) 58
36. 36.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 41;
    let b = 33;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 19;
    let b = 28;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 22;
    let b = 12;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);

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