JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 856 · 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 print? (Look at the quotes!)
   let x = "9";
   let y = 3;
   console.log(x + y); (a) 12 (b) Error (c) 93
2. 2.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) let
3. 3.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
4. 4.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Riya (d) Hello, name!
6. 6.⚡ What number does this code print?
   let coins = 25;
   coins = coins + 11;
   coins = coins - 3;
   console.log(coins);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 3;
   console.log(x + y); (a) 53 (b) 8 (c) Error
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 4;
   console.log(x + y); (a) 34 (b) Error (c) 7
9. 9.⚡ What number does this code print?
   let apples = 30;
   apples = apples + 9;
   apples = apples - 15;
   console.log(apples);
10. 10.⚡ What number does this code print?
    let score = 26;
    score = score + 6;
    score = score - 11;
    console.log(score);
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
12. 12.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) let (d) console.log()
13. 13.⚡ What number does this code print?
    let a = 15;
    let b = 36;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let score = 9;
    score = score + 8;
    score = score - 5;
    console.log(score);
15. 15.⚡ What number does this code print?
    let a = 48;
    let b = 28;
    console.log(a - b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 95 (c) 14
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) 32 (c) Error
18. 18.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, Zoya! (d) Hello, name!
19. 19.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
20. 20.⚡ What number does this code print?
    let score = 15;
    score = score + 19;
    score = score - 12;
    console.log(score);
21. 21.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
22. 22.⚡ What number does this code print?
    let a = 3;
    let b = 5;
    console.log(a * b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) Error (c) 6
24. 24.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 3;
    marks = marks - 21;
    console.log(marks);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) Error (c) 44
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 12 (b) 57 (c) Error
27. 27.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, Meera! (d) Hi, name!
28. 28.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
29. 29.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 11;
    coins = coins - 15;
    console.log(coins);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 38 (b) Error (c) 11
31. 31.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Meera (d) Hello, Meera!
32. 32.⚡ What number does this code print?
    let a = 27;
    let b = 1;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 60;
    let b = 6;
    console.log(a + b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 10 (c) 55
35. 35.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Hello, name! (d) Kabir
36. 36.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) if (d) alert()
37. 37.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 8;
    marks = marks - 11;
    console.log(marks);
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Meera! (c) Well done, name! (d) Meera
39. 39.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 4 (b) 22 (c) Error

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