JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 350 · 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.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
2. 2.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
3. 3.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
4. 4.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
5. 5.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
6. 6.⚡ What number does this code print?
   let a = 3;
   let b = 9;
   console.log(a * b);
7. 7.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) if (d) console.log()
8. 8.⚡ What number does this code print?
   let a = 20;
   let b = 9;
   console.log(a + b);
9. 9.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) console.log()
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Kabir! (d) Kabir
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) let (d) if
13. 13.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) if (d) for
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 11 (b) 65 (c) Error
15. 15.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 20;
    apples = apples - 14;
    console.log(apples);
16. 16.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 16;
    coins = coins - 35;
    console.log(coins);
17. 17.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 3;
    coins = coins - 18;
    console.log(coins);
18. 18.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 15;
    coins = coins - 12;
    console.log(coins);
19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, name! (c) name (d) Well done, Aman!
20. 20.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) let (d) for
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) name (d) Hi, name!
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, Aman! (d) Welcome, name!
23. 23.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, name! (d) Hello, Arjun!
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) 99 (c) Error
25. 25.⚡ What number does this code print?
    let books = 26;
    books = books + 2;
    books = books - 25;
    console.log(books);
26. 26.⚡ What number does this code print?
    let a = 40;
    let b = 36;
    console.log(a - b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) Error (b) 7 (c) 16
28. 28.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) Welcome, Meera! (d) name
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 = 3;
    let b = 5;
    console.log(a * b);
31. 31.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Arjun! (c) Arjun (d) Welcome, name!
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) name (d) Riya
33. 33.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 3;
    apples = apples - 6;
    console.log(apples);
34. 34.⚡ 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
35. 35.⚡ What number does this code print?
    let a = 3;
    let b = 12;
    console.log(a * b);
36. 36.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Aman! (c) Well done, name! (d) Aman
37. 37.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) Hello, name! (d) name
38. 38.⚡ What number does this code print?
    let a = 15;
    let b = 8;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 56;
    let b = 9;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let score = 26;
    score = score + 7;
    score = score - 9;
    console.log(score);

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