JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 438 · 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 a = 41;
   let b = 15;
   console.log(a + b);
2. 2.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
3. 3.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) Welcome, Arjun! (d) name
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 3;
   console.log(x + y); (a) Error (b) 93 (c) 12
5. 5.⚡ What number does this code print?
   let a = 41;
   let b = 25;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let a = 22;
   let b = 4;
   console.log(a + b);
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) for
8. 8.⚡ What number does this code print?
   let a = 6;
   let b = 11;
   console.log(a * b);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 1;
   console.log(x + y); (a) Error (b) 5 (c) 41
10. 10.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) if (d) alert()
11. 11.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
12. 12.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 9 (b) Error (c) 54
14. 14.⚡ What number does this code print?
    let books = 9;
    books = books + 10;
    books = books - 5;
    console.log(books);
15. 15.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) name (d) Well done, name!
16. 16.⚡ What number does this code print?
    let a = 32;
    let b = 15;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 6;
    coins = coins - 7;
    console.log(coins);
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
19. 19.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Riya (d) Welcome, Riya!
21. 21.⚡ Which JavaScript word repeats code? (a) for (b) if (c) console.log() (d) let
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Riya (d) Hello, Riya!
23. 23.⚡ What number does this code print?
    let a = 13;
    let b = 39;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 7;
    apples = apples - 24;
    console.log(apples);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) Error (c) 12
26. 26.⚡ What number does this code print?
    let a = 22;
    let b = 10;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 7;
    coins = coins - 15;
    console.log(coins);
28. 28.⚡ What number does this code print?
    let a = 16;
    let b = 21;
    console.log(a + b);
29. 29.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
30. 30.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 18;
    runs = runs - 13;
    console.log(runs);
31. 31.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) let
32. 32.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 16;
    marks = marks - 7;
    console.log(marks);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 14 (b) Error (c) 68
34. 34.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
35. 35.⚡ What number does this code print?
    let a = 36;
    let b = 28;
    console.log(a - b);
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Kabir (d) Welcome, name!
37. 37.⚡ What number does this code print?
    let score = 14;
    score = score + 6;
    score = score - 2;
    console.log(score);
38. 38.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Zoya (d) Well done, Zoya!
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) 62 (c) Error
40. 40.⚡ What number does this code print?
    let a = 35;
    let b = 24;
    console.log(a - b);

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