JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 924 · 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 runs = 17;
   runs = runs + 19;
   runs = runs - 26;
   console.log(runs);
2. 2.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
3. 3.⚡ What number does this code print?
   let runs = 22;
   runs = runs + 10;
   runs = runs - 1;
   console.log(runs);
4. 4.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) alert()
5. 5.⚡ What number does this code print?
   let marks = 10;
   marks = marks + 4;
   marks = marks - 3;
   console.log(marks);
6. 6.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, Meera! (d) Hi, name!
7. 7.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) console.log()
8. 8.⚡ What number does this code print?
   let a = 9;
   let b = 3;
   console.log(a + b);
9. 9.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
10. 10.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) console.log() (d) for
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) Error (c) 32
12. 12.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) for
13. 13.⚡ What number does this code print?
    let a = 57;
    let b = 5;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 13;
    apples = apples - 15;
    console.log(apples);
15. 15.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
16. 16.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) let
17. 17.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, name! (d) Well done, Arjun!
18. 18.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
19. 19.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
20. 20.⚡ What number does this code print?
    let a = 22;
    let b = 21;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let a = 30;
    let b = 28;
    console.log(a - b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
23. 23.⚡ What number does this code print?
    let a = 4;
    let b = 3;
    console.log(a * b);
24. 24.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) Well done, name! (d) name
25. 25.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) Welcome, Arjun! (d) name
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) Error (c) 77
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, Kabir! (c) Well done, name! (d) name
28. 28.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
29. 29.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
30. 30.⚡ What number does this code print?
    let a = 18;
    let b = 3;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
32. 32.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
33. 33.⚡ What number does this code print?
    let a = 11;
    let b = 8;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let a = 38;
    let b = 11;
    console.log(a - b);
35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, Meera! (c) Well done, name! (d) name
36. 36.⚡ What number does this code print?
    let a = 17;
    let b = 13;
    console.log(a - b);
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) name (d) Hi, name!
38. 38.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) 9 (c) Error
40. 40.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);

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