JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 114 · 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 JavaScript word repeats code? (a) let (b) for (c) alert() (d) console.log()
2. 2.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
3. 3.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
4. 4.⚡ What number does this code print?
   let a = 7;
   let b = 2;
   console.log(a * b);
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) 10 (b) Error (c) 64
6. 6.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Aman! (d) Aman
7. 7.⚡ What number does this code print?
   let a = 32;
   let b = 16;
   console.log(a - b);
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) if (d) alert()
9. 9.⚡ What number does this code print?
   let a = 23;
   let b = 26;
   console.log(a + b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) Error (b) 12 (c) 39
11. 11.⚡ What number does this code print?
    let score = 15;
    score = score + 11;
    score = score - 1;
    console.log(score);
12. 12.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
13. 13.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) 48 (c) Error
16. 16.⚡ What number does this code print?
    let a = 18;
    let b = 1;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let score = 7;
    score = score + 8;
    score = score - 2;
    console.log(score);
18. 18.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Aman! (c) Aman (d) name
19. 19.⚡ What number does this code print?
    let a = 28;
    let b = 4;
    console.log(a - b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 93 (b) Error (c) 12
21. 21.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, Riya! (d) Hi, name!
22. 22.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
23. 23.⚡ What number does this code print?
    let a = 42;
    let b = 6;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let score = 14;
    score = score + 4;
    score = score - 9;
    console.log(score);
25. 25.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Zoya! (d) Zoya
26. 26.⚡ What number does this code print?
    let a = 49;
    let b = 27;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 12;
    coins = coins - 10;
    console.log(coins);
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Arjun (d) Well done, Arjun!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 47 (b) 11 (c) Error
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 75 (b) 12 (c) Error
31. 31.⚡ What number does this code print?
    let a = 19;
    let b = 26;
    console.log(a + b);
32. 32.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) console.log()
33. 33.⚡ What number does this code print?
    let books = 17;
    books = books + 4;
    books = books - 16;
    console.log(books);
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Aman (d) Hi, Aman!
35. 35.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) let (d) if
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, name! (d) Hi, Kabir!
37. 37.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let score = 24;
    score = score + 17;
    score = score - 39;
    console.log(score);
39. 39.⚡ What number does this code print?
    let a = 40;
    let b = 25;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a * b);

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