JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 397 · 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 alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
2. 2.⚡ What number does this code print?
   let a = 38;
   let b = 26;
   console.log(a - b);
3. 3.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Kabir (d) Hi, name!
4. 4.⚡ Which JavaScript word repeats code? (a) for (b) let (c) alert() (d) if
5. 5.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) for (d) if
6. 6.⚡ What number does this code print?
   let a = 5;
   let b = 3;
   console.log(a * b);
7. 7.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) Hi, name! (d) name
8. 8.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) for (d) if
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) name (c) Aman (d) Welcome, name!
10. 10.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) Error (c) 62
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) for
13. 13.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 11;
    runs = runs - 2;
    console.log(runs);
14. 14.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) 10 (c) Error
16. 16.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
17. 17.⚡ What number does this code print?
    let a = 59;
    let b = 27;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let a = 58;
    let b = 9;
    console.log(a - b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) Error (b) 99 (c) 18
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 9 (c) 27
21. 21.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 17;
    marks = marks - 10;
    console.log(marks);
22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Arjun! (c) Arjun (d) name
23. 23.⚡ What number does this code print?
    let books = 28;
    books = books + 3;
    books = books - 7;
    console.log(books);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 10 (b) 82 (c) Error
25. 25.⚡ What number does this code print?
    let a = 58;
    let b = 8;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 25 (b) Error (c) 7
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
28. 28.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) for (d) alert()
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
30. 30.⚡ What number does this code print?
    let a = 43;
    let b = 2;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) name (d) Hello, Riya!
32. 32.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Hi, name! (d) Zoya
33. 33.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) Error (b) 9 (c) 54
35. 35.⚡ What number does this code print?
    let score = 15;
    score = score + 17;
    score = score - 1;
    console.log(score);
36. 36.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 19;
    coins = coins - 3;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 18;
    runs = runs - 4;
    console.log(runs);
38. 38.⚡ What number does this code print?
    let books = 25;
    books = books + 13;
    books = books - 17;
    console.log(books);
39. 39.⚡ What number does this code print?
    let a = 8;
    let b = 6;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let a = 59;
    let b = 9;
    console.log(a - b);

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