JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 413 · 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 pop-up box (d) a new tab
2. 2.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) 17 (b) 8 (c) Error
4. 4.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
5. 5.⚡ What number does this code print?
   let a = 9;
   let b = 10;
   console.log(a * b);
6. 6.⚡ What number does this code print?
   let a = 18;
   let b = 10;
   console.log(a - b);
7. 7.⚡ What number does this code print?
   let apples = 10;
   apples = apples + 16;
   apples = apples - 25;
   console.log(apples);
8. 8.⚡ What number does this code print?
   let a = 58;
   let b = 35;
   console.log(a + b);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 5;
   console.log(x + y); (a) 75 (b) Error (c) 12
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 14 (b) 95 (c) Error
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) if
12. 12.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
13. 13.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
14. 14.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) let
15. 15.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) let
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) 36 (c) Error
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) 34 (c) Error
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 67 (c) 13
19. 19.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 6;
    marks = marks - 23;
    console.log(marks);
20. 20.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 19;
    apples = apples - 35;
    console.log(apples);
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Hi, name! (c) Zoya (d) name
22. 22.⚡ What number does this code print?
    let a = 59;
    let b = 3;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) Error (b) 10 (c) 73
24. 24.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) if (d) alert()
25. 25.⚡ What number does this code print?
    let a = 17;
    let b = 35;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 15 (b) 78 (c) Error
27. 27.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
28. 28.⚡ What number does this code print?
    let score = 9;
    score = score + 15;
    score = score - 5;
    console.log(score);
29. 29.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) console.log() (d) let
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
31. 31.⚡ What number does this code print?
    let a = 6;
    let b = 10;
    console.log(a * b);
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Riya (d) Welcome, name!
33. 33.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 11;
    coins = coins - 25;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let a = 8;
    let b = 32;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 48;
    let b = 8;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 10;
    marks = marks - 27;
    console.log(marks);
37. 37.⚡ What number does this code print?
    let score = 5;
    score = score + 6;
    score = score - 2;
    console.log(score);
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Aman (c) name (d) Well done, name!
39. 39.⚡ What number does this code print?
    let score = 21;
    score = score + 11;
    score = score - 21;
    console.log(score);
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Riya! (d) Riya

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