JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 641 · 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 shows a pop-up box? (a) alert() (b) for (c) console.log() (d) if
2. 2.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Riya (b) Well done, Riya! (c) name (d) Well done, name!
3. 3.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) let (d) if
4. 4.⚡ What number does this code print?
   let coins = 30;
   coins = coins + 17;
   coins = coins - 42;
   console.log(coins);
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
6. 6.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
7. 7.⚡ What number does this code print?
   let marks = 14;
   marks = marks + 16;
   marks = marks - 5;
   console.log(marks);
8. 8.⚡ What number does this code print?
   let books = 19;
   books = books + 2;
   books = books - 6;
   console.log(books);
9. 9.⚡ What number does this code print?
   let runs = 14;
   runs = runs + 3;
   runs = runs - 17;
   console.log(runs);
10. 10.⚡ What number does this code print?
    let a = 50;
    let b = 29;
    console.log(a + b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) Error (b) 12 (c) 39
12. 12.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 19;
    apples = apples - 29;
    console.log(apples);
13. 13.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) alert()
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 14 (b) 68 (c) Error
15. 15.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
16. 16.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) Hi, name! (d) name
17. 17.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) let (d) console.log()
18. 18.⚡ What number does this code print?
    let a = 40;
    let b = 31;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let a = 34;
    let b = 6;
    console.log(a - b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
21. 21.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Arjun! (d) Arjun
22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) name (d) Arjun
23. 23.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
24. 24.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) name (d) Kabir
25. 25.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Meera! (d) Meera
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) Error (b) 14 (c) 77
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 9 (b) 81 (c) Error
28. 28.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 16;
    coins = coins - 26;
    console.log(coins);
30. 30.⚡ What number does this code print?
    let a = 37;
    let b = 3;
    console.log(a + b);
31. 31.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
32. 32.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
33. 33.⚡ What number does this code print?
    let a = 20;
    let b = 14;
    console.log(a - b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) Error (c) 56
35. 35.⚡ What number does this code print?
    let score = 14;
    score = score + 6;
    score = score - 7;
    console.log(score);
36. 36.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) for (d) let
37. 37.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) name (d) Zoya
38. 38.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 14;
    marks = marks - 4;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 11;
    marks = marks - 17;
    console.log(marks);
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Welcome, name! (d) Aman

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