JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 335 · 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 this code show?
   let name = "Meera";
   alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Meera! (d) Meera
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 3;
   console.log(x + y); (a) 6 (b) 33 (c) Error
3. 3.⚡ What number does this code print?
   let a = 16;
   let b = 13;
   console.log(a - b);
4. 4.⚡ 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
5. 5.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
7. 7.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Kabir (c) name (d) Welcome, name!
8. 8.⚡ Which JavaScript word repeats code? (a) let (b) for (c) console.log() (d) if
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 2;
   console.log(x + y); (a) 9 (b) Error (c) 72
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) Error (b) 17 (c) 8
11. 11.⚡ What number does this code print?
    let a = 47;
    let b = 18;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 2;
    marks = marks - 8;
    console.log(marks);
13. 13.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 19;
    marks = marks - 22;
    console.log(marks);
14. 14.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) for (d) console.log()
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) alert() (d) if
16. 16.⚡ What number does this code print?
    let a = 7;
    let b = 11;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 3;
    coins = coins - 11;
    console.log(coins);
18. 18.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 14;
    coins = coins - 33;
    console.log(coins);
19. 19.⚡ What number does this code print?
    let books = 16;
    books = books + 13;
    books = books - 11;
    console.log(books);
20. 20.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Kabir (d) Hello, Kabir!
21. 21.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 14;
    runs = runs - 30;
    console.log(runs);
22. 22.⚡ What number does this code print?
    let a = 39;
    let b = 9;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let score = 11;
    score = score + 9;
    score = score - 19;
    console.log(score);
24. 24.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 10;
    marks = marks - 2;
    console.log(marks);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 34 (b) 7 (c) Error
26. 26.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) if (d) let
27. 27.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let a = 54;
    let b = 9;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 8 (b) 26 (c) Error
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 13 (c) 67
31. 31.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the domain name (d) the page title
32. 32.⚡ What number does this code print?
    let score = 5;
    score = score + 19;
    score = score - 6;
    console.log(score);
33. 33.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
34. 34.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
35. 35.⚡ What number does this code print?
    let a = 53;
    let b = 6;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 34;
    let b = 20;
    console.log(a - b);
37. 37.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
38. 38.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 13;
    marks = marks - 13;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 12;
    apples = apples - 13;
    console.log(apples);
40. 40.⚡ What number does this code print?
    let a = 36;
    let b = 22;
    console.log(a - b);

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