JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 591 · 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.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) alert()
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
3. 3.⚡ What number does this code print?
   let score = 9;
   score = score + 3;
   score = score - 2;
   console.log(score);
4. 4.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, Riya! (d) Well done, name!
5. 5.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Arjun (c) Well done, name! (d) name
6. 6.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
7. 7.⚡ What number does this code print?
   let a = 38;
   let b = 21;
   console.log(a - b);
8. 8.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
9. 9.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) for (d) alert()
11. 11.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) console.log() (d) let
12. 12.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 12;
    coins = coins - 15;
    console.log(coins);
13. 13.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 16;
    runs = runs - 13;
    console.log(runs);
14. 14.⚡ What number does this code print?
    let a = 37;
    let b = 16;
    console.log(a - b);
15. 15.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Well done, name! (d) Kabir
16. 16.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) let
17. 17.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Kabir (d) Hi, Kabir!
18. 18.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 4;
    marks = marks - 9;
    console.log(marks);
20. 20.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) name (d) Hi, Riya!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 96 (b) 15 (c) Error
22. 22.⚡ What number does this code print?
    let score = 15;
    score = score + 2;
    score = score - 7;
    console.log(score);
23. 23.⚡ What number does this code print?
    let score = 8;
    score = score + 7;
    score = score - 15;
    console.log(score);
24. 24.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 4;
    coins = coins - 2;
    console.log(coins);
25. 25.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) name (d) Hello, name!
26. 26.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a + b);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) name (d) Hi, name!
28. 28.⚡ What number does this code print?
    let a = 8;
    let b = 21;
    console.log(a + b);
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Hi, name! (d) Zoya
30. 30.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
31. 31.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 16;
    runs = runs - 4;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 14;
    coins = coins - 29;
    console.log(coins);
33. 33.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, Aman! (d) Well done, name!
34. 34.⚡ What number does this code print?
    let a = 55;
    let b = 29;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 40;
    let b = 37;
    console.log(a + b);
36. 36.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) if
37. 37.⚡ What number does this code print?
    let books = 18;
    books = books + 5;
    books = books - 17;
    console.log(books);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) Error (c) 94
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 25 (c) 7
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) 9 (c) Error

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