JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 791 · 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 = "Riya";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) Welcome, Riya! (d) name
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 6;
   console.log(x + y); (a) Error (b) 10 (c) 46
3. 3.⚡ What number does this code print?
   let a = 55;
   let b = 28;
   console.log(a - b);
4. 4.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Kabir! (d) Kabir
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Hi, name! (d) Kabir
6. 6.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) console.log() (d) let
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 7;
   console.log(x + y); (a) Error (b) 9 (c) 27
8. 8.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) for
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 4;
   console.log(x + y); (a) Error (b) 14 (c) 5
10. 10.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
11. 11.⚡ What number does this code print?
    let coins = 15;
    coins = coins + 5;
    coins = coins - 6;
    console.log(coins);
12. 12.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) let
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) for
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) Error (b) 6 (c) 33
15. 15.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 7;
    runs = runs - 4;
    console.log(runs);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 18 (c) 9
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) Kabir (d) name
18. 18.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Riya (d) Hi, name!
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 97 (b) 16 (c) Error
21. 21.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) let
22. 22.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
23. 23.⚡ What number does this code print?
    let score = 19;
    score = score + 20;
    score = score - 10;
    console.log(score);
24. 24.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
25. 25.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) Error (b) 16 (c) 79
27. 27.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 14;
    apples = apples - 19;
    console.log(apples);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) Error (c) 35
29. 29.⚡ What number does this code print?
    let a = 37;
    let b = 34;
    console.log(a - b);
30. 30.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
31. 31.⚡ What number does this code print?
    let books = 10;
    books = books + 12;
    books = books - 20;
    console.log(books);
32. 32.⚡ 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
33. 33.⚡ What number does this code print?
    let a = 57;
    let b = 16;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 11;
    runs = runs - 35;
    console.log(runs);
35. 35.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) Welcome, Arjun! (d) name
36. 36.⚡ What number does this code print?
    let books = 27;
    books = books + 17;
    books = books - 9;
    console.log(books);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 10 (b) 37 (c) Error
38. 38.⚡ What number does this code print?
    let a = 6;
    let b = 31;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) name (d) Zoya

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