JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 740 · 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 coins = 7;
   coins = coins + 4;
   coins = coins - 8;
   console.log(coins);
2. 2.⚡ What number does this code print?
   let score = 30;
   score = score + 18;
   score = score - 33;
   console.log(score);
3. 3.⚡ What number does this code print?
   let runs = 9;
   runs = runs + 18;
   runs = runs - 7;
   console.log(runs);
4. 4.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
5. 5.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) let (d) console.log()
7. 7.⚡ What number does this code print?
   let coins = 19;
   coins = coins + 5;
   coins = coins - 8;
   console.log(coins);
8. 8.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
9. 9.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
10. 10.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
11. 11.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 7;
    marks = marks - 20;
    console.log(marks);
12. 12.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
13. 13.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Aman (d) Hi, Aman!
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 56 (c) 11
15. 15.⚡ What number does this code print?
    let score = 20;
    score = score + 16;
    score = score - 23;
    console.log(score);
16. 16.⚡ What number does this code print?
    let a = 19;
    let b = 13;
    console.log(a - b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) Error (b) 39 (c) 12
18. 18.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 11;
    coins = coins - 5;
    console.log(coins);
19. 19.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 13;
    apples = apples - 4;
    console.log(apples);
20. 20.⚡ What number does this code print?
    let a = 29;
    let b = 12;
    console.log(a + b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 7 (b) 61 (c) Error
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) 11 (c) Error
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 10 (b) Error (c) 37
25. 25.⚡ What number does this code print?
    let a = 51;
    let b = 11;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 12;
    runs = runs - 14;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
28. 28.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) let
29. 29.⚡ What number does this code print?
    let a = 10;
    let b = 10;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 37;
    let b = 26;
    console.log(a + b);
31. 31.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) for
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, Meera! (d) Welcome, name!
33. 33.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 20;
    coins = coins - 16;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 3;
    apples = apples - 6;
    console.log(apples);
35. 35.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) Well done, name! (d) name
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 48 (b) Error (c) 12
37. 37.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 18;
    coins = coins - 19;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let a = 57;
    let b = 13;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 25;
    let b = 30;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 15;
    apples = apples - 6;
    console.log(apples);

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