JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 692 · 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.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
3. 3.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Well done, name! (d) Aman
4. 4.⚡ What number does this code print?
   let runs = 5;
   runs = runs + 5;
   runs = runs - 10;
   console.log(runs);
5. 5.⚡ What number does this code print?
   let books = 17;
   books = books + 15;
   books = books - 27;
   console.log(books);
6. 6.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Riya (d) Hi, name!
7. 7.⚡ What number does this code print?
   let coins = 18;
   coins = coins + 3;
   coins = coins - 19;
   console.log(coins);
8. 8.⚡ What number does this code print?
   let score = 11;
   score = score + 16;
   score = score - 22;
   console.log(score);
9. 9.⚡ What number does this code print?
   let coins = 22;
   coins = coins + 8;
   coins = coins - 30;
   console.log(coins);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) let (d) if
11. 11.⚡ What number does this code print?
    let a = 60;
    let b = 28;
    console.log(a + b);
12. 12.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) alert() (d) console.log()
13. 13.⚡ What number does this code print?
    let a = 27;
    let b = 4;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let a = 11;
    let b = 5;
    console.log(a * b);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
16. 16.⚡ What number does this code print?
    let a = 12;
    let b = 1;
    console.log(a + b);
17. 17.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) Hi, Zoya! (d) name
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) Welcome, Arjun! (d) name
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 14 (b) 77 (c) Error
20. 20.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
21. 21.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) for
22. 22.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
23. 23.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 96 (b) 15 (c) Error
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Meera! (d) Meera
26. 26.⚡ What number does this code print?
    let a = 20;
    let b = 19;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) name (d) Hello, name!
28. 28.⚡ What number does this code print?
    let a = 53;
    let b = 2;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Zoya! (d) Zoya
30. 30.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 13;
    apples = apples - 17;
    console.log(apples);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 54 (b) 9 (c) Error
32. 32.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
33. 33.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, name! (d) Hello, Arjun!
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) Hello, Meera! (d) name
35. 35.⚡ What number does this code print?
    let a = 32;
    let b = 16;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 54;
    let b = 38;
    console.log(a + b);
37. 37.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
38. 38.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
39. 39.⚡ 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!
40. 40.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) alert()

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