JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 700 · 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.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 8;
   console.log(x + y); (a) 14 (b) 68 (c) Error
3. 3.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
4. 4.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
5. 5.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) for (d) console.log()
6. 6.⚡ What number does this code print?
   let apples = 11;
   apples = apples + 5;
   apples = apples - 5;
   console.log(apples);
7. 7.⚡ What number does this code print?
   let a = 60;
   let b = 2;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 14;
   let b = 5;
   console.log(a - b);
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) for
10. 10.⚡ What number does this code print?
    let books = 23;
    books = books + 4;
    books = books - 5;
    console.log(books);
11. 11.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) if (d) for
12. 12.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
13. 13.⚡ What number does this code print?
    let a = 29;
    let b = 22;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 12;
    coins = coins - 11;
    console.log(coins);
15. 15.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 15;
    coins = coins - 27;
    console.log(coins);
16. 16.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Kabir! (d) Kabir
17. 17.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
18. 18.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Kabir (d) Hi, Kabir!
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) 4 (c) Error
20. 20.⚡ What number does this code print?
    let a = 57;
    let b = 33;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let a = 6;
    let b = 7;
    console.log(a * b);
22. 22.⚡ What number does this code print?
    let a = 19;
    let b = 17;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 32;
    let b = 8;
    console.log(a - b);
24. 24.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 8 (b) 17 (c) Error
26. 26.⚡ What number does this code print?
    let a = 49;
    let b = 7;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) Well done, name! (d) name
28. 28.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Arjun (c) Well done, name! (d) Well done, Arjun!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) Error (c) 96
30. 30.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) Zoya (d) name
32. 32.⚡ What number does this code print?
    let a = 39;
    let b = 33;
    console.log(a - b);
33. 33.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, name! (d) Hi, Arjun!
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Aman (b) Well done, Aman! (c) name (d) Well done, name!
35. 35.⚡ What number does this code print?
    let score = 17;
    score = score + 12;
    score = score - 23;
    console.log(score);
36. 36.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 5;
    coins = coins - 8;
    console.log(coins);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 32 (b) Error (c) 5
38. 38.⚡ What number does this code print?
    let a = 21;
    let b = 15;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 42;
    let b = 35;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 11;
    runs = runs - 3;
    console.log(runs);

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