JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 315 · 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 = "Kabir";
   console.log("Hello, " + name + "!"); (a) name (b) Kabir (c) Hello, Kabir! (d) Hello, name!
2. 2.⚡ What number does this code print?
   let a = 9;
   let b = 36;
   console.log(a + b);
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) Hi, name! (d) name
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) if (d) alert()
5. 5.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
6. 6.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Aman! (d) Aman
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 6;
   console.log(x + y); (a) 11 (b) 56 (c) Error
8. 8.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
9. 9.⚡ What number does this code print?
   let a = 3;
   let b = 11;
   console.log(a * b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) 86 (c) Error
11. 11.⚡ What number does this code print?
    let a = 6;
    let b = 38;
    console.log(a + b);
12. 12.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
13. 13.⚡ What number does this code print?
    let a = 25;
    let b = 37;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 55;
    let b = 16;
    console.log(a + b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 3 (c) 12
16. 16.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
17. 17.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) for (d) alert()
18. 18.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) alert() (d) console.log()
19. 19.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 19;
    apples = apples - 19;
    console.log(apples);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) Error (b) 11 (c) 65
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
22. 22.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) let (d) for
23. 23.⚡ What number does this code print?
    let a = 27;
    let b = 19;
    console.log(a + b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) Error (b) 11 (c) 74
25. 25.⚡ What number does this code print?
    let score = 18;
    score = score + 2;
    score = score - 20;
    console.log(score);
26. 26.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 15;
    runs = runs - 7;
    console.log(runs);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Kabir (c) name (d) Welcome, name!
28. 28.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
29. 29.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Kabir! (c) Kabir (d) name
30. 30.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) Error (b) 14 (c) 68
32. 32.⚡ What number does this code print?
    let score = 9;
    score = score + 10;
    score = score - 14;
    console.log(score);
33. 33.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) name (d) Hi, name!
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) name (b) Zoya (c) Welcome, Zoya! (d) Welcome, name!
35. 35.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let a = 38;
    let b = 2;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
38. 38.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
39. 39.⚡ What number does this code print?
    let a = 40;
    let b = 12;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let books = 16;
    books = books + 18;
    books = books - 29;
    console.log(books);

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