JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 316 · 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 = "Arjun";
   alert("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
2. 2.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) console.log()
3. 3.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!
4. 4.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) for
5. 5.⚡ What number does this code print?
   let a = 43;
   let b = 4;
   console.log(a + b);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 7;
   console.log(x + y); (a) 14 (b) 77 (c) Error
7. 7.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 1;
   console.log(x + y); (a) 8 (b) Error (c) 71
9. 9.⚡ What number does this code print?
   let marks = 10;
   marks = marks + 17;
   marks = marks - 24;
   console.log(marks);
10. 10.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
11. 11.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 6;
    apples = apples - 3;
    console.log(apples);
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) Error (c) 86
15. 15.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) Hi, name! (d) name
16. 16.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) if (d) alert()
17. 17.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) if (d) let
18. 18.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
19. 19.⚡ What number does this code print?
    let a = 20;
    let b = 12;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a * b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) 73 (c) Error
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 88 (b) Error (c) 16
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 81 (c) 9
25. 25.⚡ What number does this code print?
    let a = 41;
    let b = 17;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 19;
    runs = runs - 3;
    console.log(runs);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, name! (c) Hello, Arjun! (d) name
28. 28.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) alert()
29. 29.⚡ What number does this code print?
    let a = 41;
    let b = 8;
    console.log(a + b);
30. 30.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
31. 31.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 9;
    marks = marks - 4;
    console.log(marks);
32. 32.⚡ What number does this code print?
    let a = 21;
    let b = 8;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 4;
    apples = apples - 10;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 8;
    marks = marks - 2;
    console.log(marks);
35. 35.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
36. 36.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 11;
    runs = runs - 10;
    console.log(runs);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) Error (b) 16 (c) 7
38. 38.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 13;
    apples = apples - 21;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 8;
    runs = runs - 33;
    console.log(runs);
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) Welcome, Riya! (d) name

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